Thank you for taking the time to explain the complexity of cam lobes
@PowellCams
Ай бұрын
Glad it was helpful!
@DavidSmith-eu4lq
Ай бұрын
Great videos and a lot of good information in easy to understand language.
@PowellCams
Ай бұрын
@DavidSmith-eu4lq tyvm! Glad it's helpful
@Rob-q6i
40 минут бұрын
Great piece of info' for me at 15 minute mark of video. Issue I had is where to mill the slot for oil delivery in the bronze lifter bushings for a 60mm cam, 937 lifters in raised cam block. Was driving myself crazy trying to calculate where the oil band in the lifter would be in the full sweep of the lobe by working from the base circle upwards, instead of the nose down. As you said, the top of the lobe is always going to be at the outside of the journal diameter. So long as I keep 3mm of oil slot in the side of the bushing open to the oil band at full lift and 3mm at the base circle, all my lifters will always have access to oil. Keeping an eye on the lifter link bar to not touch the top of the bushing by positioning the bush at the correct depth into the lifter bore. thanks
@austinsteinhafel2623
Ай бұрын
Could you do a video on LSA? How does it affect the engine while running? Does it contribute to overlap bleeding off compression? The way you explain things sure does make it easy to understand, thanks for the content!
@PowellCams
Ай бұрын
We will definitely get to that
@user-rf8ly2oc5l
9 күн бұрын
Thanks for all your information 👍 best videos out there !!!
@PowellCams
7 күн бұрын
I appreciate that!
@mhardy216
Ай бұрын
I dont know much, but I do know to shut up and listen when a man uses skeeter legs as a measurement. Keep up the great content! Priceless
@PowellCams
Ай бұрын
Thanks, will do!
@VGHCX
Ай бұрын
A skeeter leg is about .33333 of a whisker hair. Didn't you pay attention in math class in kindergarten?
@jeffreydurham5342
13 күн бұрын
@@VGHCX [3skeeterlegs] x 4 = 1.5 blond....
@benrossbach6501
Ай бұрын
Love the Learning but, all the info just reaffirms the fact that most of us should listen to their cam guy. Thsnks as always
@PowellCams
Ай бұрын
Glad it's helping 😌
@v8packard
Ай бұрын
What if your cam guy is a maniac?
@JonBanquer
16 күн бұрын
Here are my notes/cheat sheet for Part 3. Note, my question on not being sure if this is oscillation. Any corrections appreciated. Hope this helps others new to Cams: Part 3: You set Lash on the Base Circle for a Solid Roller Cam. On many engines the B.C. determines how long the Pushrod needs to be. For a Journal Camshaft (A Camshaft going in a block) a .500 Lift Cam is always going to have a larger B.C. than a .600 Lift Cam. The following applies as you look at the side profile of a Cam from the front where the dowel pin is and move up from the B.C. to the Nose Radius headed counterclockwise: When a Lifter is on the B.C. it has zero Acceleration and is not moving anything. The Opening Ramp on a Cam is a very tiny area right after the B.C. You can consider the Opening Ramp like getting on an interstate highway because you can’t just go from very low speed to wide open high speed. It’s not an instant occurrence. Without an Opening Ramp you would shock the Valve Spring and the rest of the cycle would be trashed from, I think, oscillation. Immediately preceding the tiny Opening Ramp is the Opening Flank. The Opening Flank is sometimes called The Main Event. After the Opening Flank at the top of the Cam is the Nose Radius. The Velocity usually increases till you get close to the Nose Radius. Then the Velocity slows down till it gets over the Nose Radius. Once over the Nose Radius it will increase over the Closing Flank till it gets to the Closing Ramp where the Valve is set back down on it’s seat. Generally speaking you can bring a Valve off of its Seat faster than you can set it back down. If you set a Valve down too hard it will bounce. You can see when this is happening on a Spintron, and you can usually see it on Valve Seats and on Valve Locks: www.enginebuildermag.com/2018/10/what-is-a-spintron-and-how-does-it-work/ Generally the Opening Event is more Aggressive than the Closing Event. When the sides of a Cam are different we call it an asymmetrical lobe design. When the sides are the same we call it a symmetrical lobe design. For a pushrod engine from the center of the B.C. to the top of the Lobe can’t exceed the Cam Journal. Example for an LS engine: The diameter of a Journal on an LS = 2.165. 2.165 divided by 2 = 1.0825. 1.0825 is the distance from the middle of the B.C. to the top of the Nose Radius. Lets say your Lobe lift is .330. 1.0825 - .330 = .7525 .7525 x 2 = 1.505 1.505 is your Base Circle diameter. We now add .330 to 1.505 to get our Heel to Toe dimension which is 1.835. To get clearance we take 1.835 and subtract .010 giving us 1.825. This gives us clearance for the Lobes to be able to go through the Cam Bearings. You can not regrind a Hydraulic Flat Tappet Cam and make it a Solid Roller Cam because the Nose is too small. There simply isn’t enough material there. Even if you could, you can’t run a hardened steel Roller Lifter wheel on a soft grey iron Cam. You can better gauge a Cam at .050 than you can at .006. .050 is the Cam industries standard. Whether it’s .006, .050 or .200 the number refers to both Opening and Closing Duration.
@PowellCams
5 күн бұрын
Great job
@bobbyabbott3035
24 күн бұрын
this is much better than watching a movie any day of the week
@PowellCams
24 күн бұрын
Glad u enjoyed it!
@andrewcammer2535
Ай бұрын
I have been enjoying your video series, having watched all three episodes so far. Something you might go back and touch on is the applications for various camshaft core materials. You talked about 5150, 8620, at 8660 as the common materials used, but I don't recall hearing much about where you would select one material over the other. I'd be interested to hear your perspective on that
@PowellCams
Ай бұрын
Noted! Glad you enjoyed
@Carl_Jr
Ай бұрын
Great series! 👍 I read somewhere that .050" was chosen because it is the smallest useful number where changing the rocker arm ratio has less effect on the "perceived" duration at the valve, but is still far enough away from the ramp to be uneffected by the variable of "advertised" durations used by different companies. Like, lobe lift is .050". A 1.5 rocker would be .075", a 1.6 is .080" and 1.7 rocker is .085". That's only a difference of .015 between the three, which is virtually nothing when measuring duration. It won't even change the perceived duration at the valve by more than .5* (½ a degree). Just what I remember reading from one of the car rags back in the late 80s.
@PowellCams
26 күн бұрын
Ty!
@glennborek2359
Ай бұрын
Great video, I freshened up my dart SHP 427 sbc I learned about what you’re talking about the expensive way. The original engine builder told me it was a 0.900 base Circle cam , so when I bought a new cam for it, I got a 0.900 Base Circle cam with the same lift little bit different duration , and purchased the exact same lifters that were originally in the engine. Well, after i destroyed a set of roller rockers after 200 miles , even though there seem to be enough oil up there it definitely wasn’t enough. Took the engine apart, measured the old cam , and the base circle was only ..875 🤬 so with the new .0900 cam what happened when the cam just hit full lift the oil gallery that runs through the lifters was momentarily blocked because the lifter rose higher in the bore because of the larger base circle. Live and learn, I guess. Lol.
@PowellCams
Ай бұрын
If the original cam was a .875 ( nobody makes anything smaller than .900, so either it was a regrind or a mistake) new cam was .900 the lifter was only .012" higher, so that wasn't your problem...
@RustyorBroken
Ай бұрын
The closer view is 💯better. Thanks for making the change!
@PowellCams
Ай бұрын
You’re welcome 😊
@NoMatter78
Ай бұрын
Just thank you for your time and shared knowledge.
@PowellCams
Ай бұрын
My pleasure!
@VinceT2940
Ай бұрын
I'll repeat it this is a great series, there were some valuable nuggets in there today! I'm saving all of these for future reference.
@PowellCams
Ай бұрын
Glad it helps
@MarineGrunt
Ай бұрын
I figured if I watched the entire series , my questions would have answers . You answered them in easy to understand layman's language too ! Keep up the great videos . I'm sure I'll never apply what I'm learning . but I'm getting answers to questions I've had for years .
@PowellCams
Ай бұрын
Glad it's helpful !
@user-qc7qy2jo6k
Ай бұрын
Awesome videos had reed cams custom grind me a solid billet roller camshaft about 25 yrs ago and they gave me alot of the same knowledge you are giving good stuff
@PowellCams
Ай бұрын
Right on
@GrandPitoVic
Ай бұрын
Thank you for the information sir. Again I've learned more than I already knew. Great videos sir!!
@PowellCams
Ай бұрын
Glad to help
@bobqzzi
Ай бұрын
Just a fantastic job explaining everything. Thanks very much.
@PowellCams
Ай бұрын
Glad it was helpful!
@Mr688895
Ай бұрын
Another great video. Thank you and hope Debby doesn’t cause any problems for you. They are predicting alot of rain in SW Virginia.
@PowellCams
Ай бұрын
Yep, wind and rain is expected!
@user-gc8vf8yj1e
Ай бұрын
You sound like a good cam grinder and not just a cam salesman!!!
@PowellCams
Ай бұрын
We try hard
@TheJohndeere466
Ай бұрын
International pulling tractors usually use a dt466 engine and some of those have factory roller lifters with tie bars. If you regrind a stock cam the tie bars will usually hit on top of the lifter bores and the lifter bores need machined off.
@PowellCams
Ай бұрын
Didn't know that
@georgedreisch2662
Ай бұрын
“3 skeeter legs long”. Y’all got a conversion number for that? Seems 3 skeeter legs oughta equal ‘bout a dozen C hairs…😜 Seriously though, this is good stuff. Thanks for sharing.
@PowellCams
Ай бұрын
Lo, no problem
@VGHCX
Ай бұрын
The SAE plans on adding the skeeter leg and whisker hair measurements to their program. They may replace the metric system.
@sjcottsi
Ай бұрын
Years ago I was taught that they were “quieting ramps “. They were supposed to take out the valve lash gradually so you didn’t hear a click. The teacher never expounded on hydraulic lifters so I just assumed they didn’t need ramps. You are in a field that most people don’t learn the finer details.
@PowellCams
Ай бұрын
Ty, glad it's helping
@danielmoon7322
Ай бұрын
Three skeeter legs long 😂
@PowellCams
Ай бұрын
That is a calibrated measurement below the Mason Dixon line....lol
@jcnpresser
Ай бұрын
I just pulled the cam in my 5.0 ho mustang, it’s a factory roller type deal. I was trying to see what it was, it’s not stock, but it has only a couple of markings on it, a 3 and 5 , both are not real close together, and three slash marks that start in the center and go out, they’re equally spaced apart on the back end. That’s it. I spent probably ten minutes hunting for more and that’s all I could find. I did notice that all comp cams for that engine have a35 in the beginning of the part number. Oh and lobe lift is .315 in and .335 exh.
@PowellCams
Ай бұрын
Probably a generic deal, white box
@jcnpresser
Ай бұрын
@@PowellCams I was wondering that, looks like it was done years ago, by judging the timing cover gaskets and intake gaskets. The three hash marks looks familiar to a stock cam but idk. Thanks though! Really liking the videos y’all are doing.
@rogeroaks2865
Ай бұрын
Thank ypu for taking the time to do these awsome vidios. Some street hydraulic roller cams can create a sewing machine type noise even with correct geometry and adjustment, how do we avoid this problem??
@PowellCams
Ай бұрын
A lot of time's it's lifter bleed rate causing it and it can be a harsh lobe design making noise.
@craigbowers4047
Ай бұрын
Remember the very short lived Comp Cams solid cam profiles that came out around 1990 with the funky ramps that ran 0.010 - 0.030 lash and changed the advertised duration a good bit depending on the lash? Holy crap were they noisy. Then came their noisy 1st gen. inverted flank rollers and rev kits. Technology and common sense has really helped the cam industry.
@PowellCams
Ай бұрын
Duration will change with lash on any cam, the inverse radius is snake oil IMHO
@RidgeRunner5150
Ай бұрын
"snap", "crackle" and "pop"
@PowellCams
Ай бұрын
Right after jerk..
@jeffreydurham5342
16 күн бұрын
Who drew that lobe? (I've seen your drawings). Thanks for all you do!
@PowellCams
16 күн бұрын
Lol, I found me something to trace off camera..... I'm trying 😪
@jmflournoy386
7 күн бұрын
Crane used .006 at the valve which is an SAE standard used all the big grinders with 1.5 rockers it's .004 at the lifter Isky uses some 8-10 Engle 008 crower 005 Chet Herbert used 001 with the 400 degree cam don't laugh we won top fuel and top gas at the 62 AHRA nationals with the twin chevies with it )tightened the lash to give lonter duration for a greasy track)
@PowellCams
6 күн бұрын
It's irrelevant where u measure adv duration, what does matter is when comparing multiple cams you look a dur #'s at multiple lift points
@jmflournoy386
6 күн бұрын
@@PowellCams which is why i had one of the earliest cam doctors BTW we built a lot of Motor home motors with 30 degree seats as the cams could not have much lift due to the short durations curtain area so we started checking at least .050 off the seat you have to get the charge moving early cheers
@codyyoung3078
Ай бұрын
Great series! Lots of stuff thats not talked about
@PowellCams
Ай бұрын
💯
@merrittmagruder3122
Ай бұрын
Nice work! 👍🏻
@PowellCams
Ай бұрын
Thanks! 👍
@jmflournoy386
Ай бұрын
a 600 lift cam is going to have a smaller base circle than a 500 lift cam unless the cam bearings are large enough to fit the 600 lift cam through with a stock base circle OR you have a cam that is installed with removeable bearings like OHC What about that Bonneville Flathead where they installed the cam and cam bearings together INGNIUS on our early 60s XKE we NOTCHED the lifter bores to clear the wider and larger cam lobes without reducing the base circle Cam was by Kenny Harmon of Harmon Collins Isky still makes buttons to adjust the lash with his reduced base circle XKE grinds we ground them on the side of a bench grinder wheel by pushing with a dowl.....
@PowellCams
Ай бұрын
The first statement is self defeating, ..for any given journal diameter, more lift = smaller base circle.
@jmflournoy386
7 күн бұрын
@@PowellCams if I have a big enough cam journal I can have abig lobe and a big base circle
@v8packard
Ай бұрын
I am now looking on eBay for a skeeter leg indicator. Thanks for the video.
@PowellCams
Ай бұрын
Lol
@v8packard
Ай бұрын
@@PowellCams BTW, I think duration @ .006 became more prevalent when Harold Brookshire started doing lobe designs for Comp Cams about a zillion years ago. He had done some lobes for General Kinetics, but Comp wanted them to look different. At GK Harold used duration @ .004, at Comp he used .006. Same lobes! A GK 270 is a Comp 268H. Once Comp was doing this a lot, others started listing duration @ .006 for hydraulics. SAE duration is a variation on this, factoring in the rocker ratio for duration at the valve.
@wayneskelly4297
Ай бұрын
How much "tuning window" is there by adjusting valve lash? I was told years ago +or- .006 was ok. After listening to your vids I am not as sure of that. LOL
@PowellCams
Ай бұрын
Just depends on the lobe design
@ronwest7930
Ай бұрын
I know enough about cams, but I'll add that the quality of steel is a problem. Soft cams that don't last. It's something I keep hearing and I've seen videos about it also. I always worry that a fresh engine will pay the price.
@PowellCams
Ай бұрын
I've checked probably 1000 cams, haven't found a soft one yet, can u link a video of a rockwell test showing a soft one?
@markmcmullen1371
Ай бұрын
What's the length of a skeeter leg so I know how long 3 are, 🤣🤣🤣 Sorry Dan I just had to do that, good show keep up the good work.👍👍👍
@PowellCams
Ай бұрын
Lol
@timothybayliss6680
Ай бұрын
Nissan RB engines have the issue with aftermarket lobes hitting the casting. Basically any aftermarket cam is gonna hit the head.
@PowellCams
Ай бұрын
Yep
@arturozarate1752
Ай бұрын
😁
@PowellCams
Ай бұрын
Ty
@arturozarate1752
Ай бұрын
@@PowellCamsuh....you know I mean well, butt....
@christaylor-mn7yq
Ай бұрын
Great series. Just for an example if you took a ford f303 cam that was in the original NASCAR LMSC 347 that has ID-288, ED-288 advertised and ID-226, ED-226 @.050. IL-512, EL-512 on a 114 LS. What’s possible?
@PowellCams
Ай бұрын
You could add prob 5- 10 degrees and probably. .02-.03 lobe lift
@GhostSniper67
Ай бұрын
It would be great if you showed us on an engine, how to measure lift at the 6 and 50 and others. Where do we measure and where do we get these numbers. To kind of put it all together.
Can you explain that crazy term called jerk . I've read that the flathead Ford v8 had an interesting jerk pattern
@PowellCams
Ай бұрын
Jerk is the 3rd derivative, it's the rate of change of acceleration
@RustyorBroken
Ай бұрын
Daniel has it. The ramp portion he spoke about in the beginning is controlling jerk. Here's how the math works out. Distance traveled ÷ time = velocity, velocity ÷ time = acceleration, acceleration ÷ time = jerk. Jerk is the rate at which acceleration occurs. Think of it in terms of how sudden or severe the acceleration is. A decent analogy would be dumping the clutch versus easing it out. For a cam profile you cannot eliminate jerk. You can only minimize it to a certain degree. I believe the only motion that has zero jerk is an eccentric (crank).
@jimm8264
Ай бұрын
It's oil gallery not galley. A galley is a kitchen on a ship. But nice video.
@PowellCams
Ай бұрын
Normally I say gallery... I can't believe I said it wrong
@jimm8264
Ай бұрын
@@PowellCams It's all good man. Just busting your b...s
@ericsmcmahan
3 күн бұрын
Daniel, do u have to degree an asymmetrical lobe cam differently than u would degree a cam with symmetrical lobes?
@PowellCams
3 күн бұрын
Na, most of the asymmetriy is close the base circle so it won't effect the degreeing.
@Planeiron
Ай бұрын
👍👍👍👍👍👍
@PowellCams
Ай бұрын
Ty
@patrickwendling6759
Ай бұрын
Thank you for your knowledge and videos USA 🇺🇸 TRUMP 2024
@PowellCams
Ай бұрын
💯
@codyyoung3078
Ай бұрын
You mentioned it but how does the lobe math you demonstrated with not exceeding the cam journal radius figure into small base circle stuff like .900 base circle small block chevy stuff? Maybe you can touch on that in another video
@PowellCams
Ай бұрын
. 900 bc is .900, so you add the lobe lift to .900 and that's heel to toe
@chimpfoos65
Ай бұрын
So you make the the soft side the off side of it 5 mosquito legs
@PowellCams
Ай бұрын
Exactly 💯
@TheMan_inBlack
Ай бұрын
On a hydraulic roller; is there a way to check push rod length without using dummy/light weight valve springs?
@PowellCams
Ай бұрын
Yes, you don't need to open the valve, so spring is irrelevant
@Anthony-nw5zv
Ай бұрын
I'm trying to absorb all the ingredients. 🥴
@PowellCams
Ай бұрын
You can do it!
@jmflournoy386
Ай бұрын
so how do you spec lobe centers with those asymetrical lobes,, actually or from .050 timing It makes a Big difference (ask me how I know)
@PowellCams
Ай бұрын
Peak lift is still the CL
@jmflournoy386
Ай бұрын
@@PowellCams Yes except for a few grinders who use .050 timing with an asymmetrical lobe you hafe to fudge if trying to model piston demand Why some like really tight LSA and early timing reality is wider and later cheers
@scotthatch4548
Ай бұрын
How about going over the effect of solid lash on the ramp and advertised duration/ duration at .050
@PowellCams
Ай бұрын
Have you watched all 3 videos?
@scotthatch4548
Ай бұрын
You started to go over it in video 1 but got distracted and then just ended the video .... Plus in that you were showing full valve lift when it should be less lash ... Plus I don't think many understand the difference in duration when comparing hydraulic to solid because of the lash
@MichaelScudder72
Ай бұрын
So you could make a high performance HR into a SR
@PowellCams
Ай бұрын
Yes with similar duration and lift
@user-gc8vf8yj1e
Ай бұрын
Can you gain cylinder compression with a cam grind to increase compression ratings ?
@PowellCams
Ай бұрын
Yes
@user-gc8vf8yj1e
Ай бұрын
@@PowellCams I’ve heard that people get cams to bleed off cyc pressure.
@PowellCams
Ай бұрын
@@user-gc8vf8yj1e correct
@Liam-yn6gp
Ай бұрын
I want some powell cams shirts, post a link.
@PowellCams
Ай бұрын
Check out my product! www.powellmachineinc.com/product-page/powell-cams-t-shirt-xl
@PowellCams
Ай бұрын
Powellmachineinc.com
@markc9409
Ай бұрын
could you explain how changing timing events allows 10.5 or 11-1 static compression on the street and still idles good and drives good. One thing I have learned over the last 15 years is when I order a cam the card doesn't look anything like I thought it would so I guess Clint is right you got to know your limitations. Thank you for being so generous with your time.
@PowellCams
Ай бұрын
Dynamic compression is a product of the intake valve closing #
Пікірлер: 129