This is facts. I use RFD and Curtis B and Dan preach, I dont sale or race flow numbers. He uses it as a tool to see how stable the ports flow and so cam and such can be built.
@robindeubler1799
Жыл бұрын
Nice to hear someone speaking about PTS stuff, they’re great.
@michaelstoker6710
3 жыл бұрын
My rhs heads that you worked on and flowed was in the 330ish range on your bench and on a local shops bench was way higher.
@SpeierRacingHeads
3 жыл бұрын
Good to know!
@wisconsintractorpullingforum
5 ай бұрын
Do you use a formula for the percentage of the exhaust throat to the size of the exhaust port? Thanks
@crd-nz_001
2 жыл бұрын
There is a difference in flow depression between the two. 25in V 28in, which will account for most of the difference. The rest is how the port flow percentage improves as depression increases. My understanding is 28in is easier to math, as its closer to x0.25 for hp potential. Using the 303cfm@28in from Brodex, its about 75hp per cylinder which comes in at 600hp for a V8, or 300hp for a 4 cylinder, or 450hp for a 6 cylinder. Personally, I use a floating pressure bench which goes against the industrial standard of being fixed.
@smilsmff
Жыл бұрын
Now i am seeing that the Bore size used for testing flow is making a few cfm difference. what would you say?
@68nitrostang
2 жыл бұрын
Great video Chad
@nighttrain66
3 жыл бұрын
GREAT VIDEO!!!
@SpeierRacingHeads
3 жыл бұрын
Thanks!
@nighttrain66
3 жыл бұрын
@@SpeierRacingHeads Eric Weingartner have a few good videos explaining how a 28” flow test is WAY down the list of what makes a head work. Flow bench is/should be used for so much more and a 28” flow test is WAY down the list. I prefer to max out depression and look for problems with pitot tubes when designing a port but everyone wants to see a 28” flow sheet so . . . . . 🤷♂️
@SpeierRacingHeads
3 жыл бұрын
@@nighttrain66 Yep. I say the flow bench is life blood for the pitot tube. I use my made bench for design. I can pull 55+ on a typical small block head.
@Baard2000
3 жыл бұрын
I work 22 years on a Flowlab 1400. use always 70" ...... Then problems show up really good...😁😁. Calculate to 28" tp. As everybody uses 28". But when testing at 28" instead 70" lots of ports flow much better . So if I test at 70" and reach 300cfm for a certain head ( which should make about 300 when ported) and customer takes it to another flowbench and test it at 28" it flows sometimes 10 percent more. Also Oz Anderson told me to use ink to visualize where the air goes...and how fuel is distributed in chamber.
@SpeierRacingHeads
3 жыл бұрын
@@Baard2000 not about flow more at the more depression. It's about shape. I've never used ink. I use dykem and alcohol, works perfect.
@robindeubler1799
Жыл бұрын
Are you guys in Tonawanda?
@jvv9474
3 жыл бұрын
So your custom bench is measuring actual flow? ACFM? Its taking into account pressure difference and temp?
@SpeierRacingHeads
3 жыл бұрын
Don't need to worry about temp with an orifice style bench.
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