quote:
Originally posted by Mat_G:
... is the Crane cam #529551 a good fit for Trick flow PowerPort190 and my usage pattern ...
I like Crane's #529551 camshaft better than their smaller #529541 camshaft, especially for an engine with "small port" cylinder heads.
quote:
Originally posted by Mat_G:
... what will be roughly the dynamic compression ratio ...
I calculated the static compression ratio as 10.46:1,
Vs (swept volume: 4.010" bore x 3.50" stroke) = 724.6cc
Vc (clearance volume: 62cc combustion chambers, 8cc head gasket, 3.4cc deck clearance, 3cc piston dome, 0.2cc clearance between piston & cylinder wall) = 76.6cc
With the intake valve closing at 67° ABDC the dynamic compression ratio would be 8.19:1.
Wallace Racing Dynamic Compression Ratio Calculator
quote:
Originally posted by Mat_G:
... are there any flat top round skirt pistons à la Ross to fit 4.010 bore ...
Not off the shelf, they will have to be custom ordered. This is not impossible, or even difficult. Ross should be capable of making them for any size bore you want.
However, keep in mind that the Trick Flow heads have different (higher) dynamic compression limits than the iron factory heads. Please contact Trick Flow for guidance. Also keep in mind that North American gasoline rated at 91/92 octane is equivalent to European gasoline rated at 95 octane.