ORIGINAL: Jerseyboy
Ive done quite a few engines. Mainly flowing the sleeve. The cranks were quite good so never touched the crank.
The only timing changes Ive done was raising the exhaust port by.5 or 1 mm. This took away some bottom end and better top end.
On My SH28 6P I raised the exhaust port and flowed the engine. This beast was just way too powerfull. It revved better but snapped the rod. This mill cannot take repeated high rpm, top heavy.
So after you cut the ports up, what were the final timing profiles of these engines you modded?
Crank induction duration?
Lateral intake port durations?
Boost port duration?
Exhuast port duration?
How many degrees after TDC does the induction port open after TDC?
I too am still learning about engine modding and am trying to learn as many timing profiles as possible to determine what each profile does as far as low RPM performance, mid-RPM performance, and high RPM performance.