Opinions wanted on intake design

Strange_Brew

New member
Hey guys, even though its not a ford motor, thought some of you would be willing to throw some ideas my way on a project. Working on boosting the performance on a Oliver pulling engine we have. The engine started life as a 310 ci. waukesha motor. It is now 450 ci. 14:1 compression ratio, 12 port head, similar to a ford six head. Right now we still use up draft carburation through cast iron manifolds, carb in use was off a 800 ci. mack semi engine, and motor currently turns 3800 rpm, max set on rev limiter for now. Gng to a different class with any carbs allowed. So we are going to go down draft on it. What are the opinions on running twin carbs, something like twin 2 barrels? And if we do it like that, could both carbs sit on a common plenum, or should it be setup as a dual plenum intake design? Going to let the rpms go up to 5500 on this settup as well. Will long or short intake runners be better for this settup? The throttle does not have to have the instant response like a drag motor would need, we have time at the line to let it wind up. In a case like this, should the intake plenum displace half the ci. of the engine as I've read on other posts? Also, whats some opinions on the exhaust manifold, some guys like to build tuned full length headers, or would 6 bull horn pipes work as well? Please throw some ideas and opinions out, they would be appreciated. thanks,

Larry
 
450ci is about 80ci per pot, so thats getting pretty large. Treat it like a giant BBC
My thoughts are:-
To get torque you need six individual carbs sat on isolated runner manifold, something like a 500 holley two barrel per cylinder. No plenums or anything like that. Tuned length for that RPM will be arround 1.2m so it will get large. Your port runner would need to be around 63mm or so. something equivelent in square size, say 75x50mm.
With headers with long runners (1.5-2m) large enough for the expected power, say 52mm or so.
You going to run methanol judging by the CR 14:1 is way to high for petrol.
get the thing to be able to pull like mad at peak torque, which id geuss is going to be around 1400rpm.
Hope this helps a bit
A7M
 
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