Picking up on a thread from about 8 months ago (new house got in the way), here are the promised results from changing from 8 air cleaners to velocity stacks: "Rear Wheel nums" on a dynojet"
8 air cleaners (K & N) on squared off intake stubs: 347HP at 5900RPM, falling off, and 350 ft. lbs at 4500RPM.
8 90mm velocity stacks (air cleaners in body ducts); 365 HP at 5300RPM and an absolutely flat curve/constant 365 HP to lift off at 6500RPM, 370 ft. lbs at 4800RPM.
Note; Comp Cam is 236/242 int/exh/hyd. roller, advertised peak power at 6500, torque at 4900.
For the racers who want peak power up in the 7000,s, it seems a carb. on a high rise manifold/big plenums is the way to go (Ron Earp?) or really huge diam. intakes with low RPM drivability problems?
On a separate note, seems there are distortion problems with the (early?) TWM throttle bodies. The aluminum T/B's expand at a different rate than the linkage/butterflies. When they get hot, the balance goes to hell. Joe Leonard (of JC Performance) pointed this out and solved the problems I'd been having. An EMPI or equivalent type air flow gauge is an absolute must, along with real throttle springs to overcome binding in the linkage. Next project is to install a linkage fix (I believe Joe has one). Side note: Cold air boxes/turkey pans make it a real pain to adjust linkages.
Hope this is of interest,
Mike
8 air cleaners (K & N) on squared off intake stubs: 347HP at 5900RPM, falling off, and 350 ft. lbs at 4500RPM.
8 90mm velocity stacks (air cleaners in body ducts); 365 HP at 5300RPM and an absolutely flat curve/constant 365 HP to lift off at 6500RPM, 370 ft. lbs at 4800RPM.
Note; Comp Cam is 236/242 int/exh/hyd. roller, advertised peak power at 6500, torque at 4900.
For the racers who want peak power up in the 7000,s, it seems a carb. on a high rise manifold/big plenums is the way to go (Ron Earp?) or really huge diam. intakes with low RPM drivability problems?
On a separate note, seems there are distortion problems with the (early?) TWM throttle bodies. The aluminum T/B's expand at a different rate than the linkage/butterflies. When they get hot, the balance goes to hell. Joe Leonard (of JC Performance) pointed this out and solved the problems I'd been having. An EMPI or equivalent type air flow gauge is an absolute must, along with real throttle springs to overcome binding in the linkage. Next project is to install a linkage fix (I believe Joe has one). Side note: Cold air boxes/turkey pans make it a real pain to adjust linkages.
Hope this is of interest,
Mike