Quote:
Originally Posted by 1320racer
so based on this, I stated this in post #6 without knowing anything about his cam...
knowing that anybody today can put together a 1.5HP/cu.in bracket type engine with out of the box parts. Well I was wrong. The OP has somehow manage to throw this engine together using these junk heads that don't flow 200cfm and the way wrong cam he chose resulting in an engine that only makes about 1 HP/cu.in. not to mention that the 8700 RPM he's buzzing this grenade to is ~ 2500 RPM past peak HP!
As I stated previously, his current cam is about 40 degrees too big at .050 and we have no clue to how much lift or the LSA. Installing the right cam with ~40 degrees less duration at .050 will make ~ 100 more ft./lbs torque at peak and ~ 60 more HP at peak and peak RPM will be lowered by ~300. This engine will require a shift point of ~ 6200, a converter that flashes to ~ 5000 RPM and be geared to trap ~ 6800 RPM. More importantly it will accelerate his 2600 lb. bucket of bolts quicker and faster than it's current performance!
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I understand cylinder pressure and what components affect it but, I can't figure volumetric efficiency or dynamic compression. I understand what you are trying to tell me but, I do know this..........a N/A 340 will not run better, if it's geared to cross the finish line at 6800 RPM. That would be like switching to a 4.30 gear with my current 31.2" tire just to match 135 MPH. No Way. We have turned the post from shift points to torque converters to camshafts........and I'm completely OK with that. I'm learning! I'm even looking into a different car to try to build a super stocker.
Just guessing, I'm going to say peak HP is about 7000 RPM and Peak TQ probably 5400 RPM.