hi all dynod my car today 280 bhp 325lb torque 347 stroked bottom end Manuel car pro comp heads crane 284 cam rpm inlet 750cfm holley i was disappointed in bhp should i be?? or is that ok for this set up
Brake horsepower is at the crank. Rear wheel horsepower is done on a chassis dyno. Did you have the engine run up by itself or was it in the car?
Regardless, soulds like it just needs tuning. At the least the dyno shop should have given you your air to fuel ratio plot so you could see where your carb is.
car was on rolling road weakened off slightly on lamber at around 4500 _6000rpm but only slight the other thing he suggested was cam timing ? getting reviews on net about heads are varied <pro comp 190-210> getting help in uk is not easy so thanks for replies ,,
Max theoretical hp versus cfm = (cfm x .25) x 8 or 240/4 x 8 = 480. You will probably only get 80 to 90 percent of that at most so then it would be 384 to 432 at the flywheel. Accounting for loss to the rear you would be looking at 50 to 75 horsepower so then it is 309 to 334 at the rear wheels. I would expect to see your rear wheel horsepower in the 309 to 334 range based on the info you described for your set up.