10-15-2009, 07:31:00 PM
while i was talking to a buddy of mine. he's an old school drag racer and engine builder. he said that when he puts motor together, he puts a higher ratio rocker arm on the corners of each head to improve air flow. has anyone heard of this, and if so..is there really any benefit. it does make sense to open the valve more to draw more air into the long intake runners and to push more out. but i dunno, opinions...experiences please.
10-15-2009, 07:55:57 PM
Don't always assume becuase it happens to work on a particual motor (especially in a drag racing application) that it will work on yours.
But don't assume it won't either. If you've got the time, access to the rocker arms and want to try it, go for it. I just wouldn't purpose build it like that from day 1.
10-15-2009, 08:05:53 PM
he told me that all guys that race circle track he knew did it..so maybe it makes more sense in applications where high rpm and wot are pretty constant.
10-15-2009, 09:15:28 PM
This is an old trick to try to balance out the flow of the corner ports is all
Doing so balances out the flow which produce's more torque which then produces more power. It works sometime's and other time's, not, depending as always of course.
Off topic, but not really...
Please look up a pic of the High-Tech "Torque Link" intake if you want to see one that has been designed from the git-go to pump up roundy-round engines midrange for pulling outta the corners!
10-15-2009, 09:40:29 PM
The only problem with that is, are you going to go test and adjust bigger or smaller per hole as needed.
Just sticking some ratio on there might not be optimal for that intake. I would much rather tweak 8 carb jets, than 8 intake rockers.
Much cheaper, much quicker, for the tiny tiny power difference from cylinder to cylinder.
We did all kinds of things back then, but we didn't have close to the knowledge and parts available then, we do know.
Heck, my little stock chassis car runs faster than prostock did then.
10-15-2009, 10:04:27 PM
believe me, not somethin i plan on doin for sure. i had just never heard of it being done and figured i'd see who has. my buddy said it was good for 30 more horsies....i kinda doubted that a tad.
10-15-2009, 10:41:18 PM
If it was worth 30 more horses every car out there would do it, and everyone in the car world would have known about it.
I doubt doing all 16 would add 30 HP on most engines. Plus, bigger is not always better.
Just sticking more cam in because of the ratio does not always increase power.
The 1st thing they ask when ordering a cam is what rockers do you have.
It might have been done in the past or still done by some people.
I just doubt it's that worth while or popular.
Maybe in the past, due to the limited choice in cam's available, it was more popular??
Who knows, nothing I've ever heard of??