deciding on heads.....
#31
FormerVendor
iTrader: (5)
Your thread is one of the reasons I decided to pick up a set for my LQ4, damn good bang for the buck.
Matt everyone seems to be hung up on peak flow numbers, can you post up some tips for people in the market for heads to figure out what is best. There is a lot of voodoo about flow numbers that i think people have no idea about the different ways to skew them.
Matt everyone seems to be hung up on peak flow numbers, can you post up some tips for people in the market for heads to figure out what is best. There is a lot of voodoo about flow numbers that i think people have no idea about the different ways to skew them.
But yes, it is difficult to just look at flow numbers and make a decision. There's much more to it than just flow.....think of a garden hose vs a fire hose. You get TONS more water (air) through the larger hose which is like big flow numbers, but without the right nozzle on the end the fire hose just dumps the water out and it doesn't go far....that's somewhat like airflow velocity being affected by port size. You ultimately need the velocity to make the big power, which is a combination of more air flowing through a smaller port (over simplified no doubt) kind of like putting your thumb over the end of the garden hose and getting the velocity up!
So there's really not a concrete way to tell which is best by flow bench numbers alone. I wish there was, because it would make consumer's "jobs" much easier and less stressful!
#33
12 Second Truck Club
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man...cant decidie on heads to buy...
narrowed it down to these 2
PRC stg 2.5 5.3 heads or the TEA stg 1.5 5.3 heads.
The TEAs flow a ridiculous cfm on the exhaust side. Flow the same on intake as the PRCs. But 260cfm on the exhaust!!
narrowed it down to these 2
PRC stg 2.5 5.3 heads or the TEA stg 1.5 5.3 heads.
The TEAs flow a ridiculous cfm on the exhaust side. Flow the same on intake as the PRCs. But 260cfm on the exhaust!!
#36
FormerVendor
iTrader: (5)
Be sure to check what pipe (size and length) they use for those exhaust flow numbers. The advertised PRC numbers are NO PIPE on the exhaust. You can add more and more pipe to it and those numbers keep going higher and higher! Without the pipes, I'd expect the exhaust numbers to be very close as well
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