Quote:
Originally Posted by slowbird
276-286
You need at least another 500rpm to make your 900hp. Your cam timing & engine timing I believe are pointing to issues.
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I've been reading this thread and thinking about all of the variables.
I first questioned the dyno numbers, have you been to the track? MPH/Weight/RPM is all you need to know.
Using the dyno information, the engine peaks way to early for a large port 535ci engine. As Slowbird has indicated, 6900 RPM would be a good target to get the piston speed up to over 5000 fpm. That cylinder head with the correct valve train and cam should have a nice long flat torque curve.
Another fact is the low cylinder pressure the engine is building and the need to advance the cam that much.
Again, I don't want to make this sound negative. Big ports generally have poor low to mid lift flow numbers. By design, these types of heads require very specific timing events on the cam and increased RPM to make power.
I would check leakdown, have the cam run on a cam reader and then evaluate my cylinder head flow data before I made any other changes.
Calvin Hill
Hill Performance
708-250-7420