to continueFebruary 8 2008 at 5:56 PM | Bill (Login billinstuart) |
Response to Engine displacement, torque, bore & stroke |
| The highest load on a bearing is at overlap, where the rod is pulling against a vacuum. In practice bearing load is kinda a non-issue. The shorter rod in the small block does induce some side load, but is it significant? Dunno. Remember, the old 400 SBC used a really short rod from the factory.
I feel alot of the BBC seem to suffer from poor combinations of cam, heads, manifolds..these contribute to the relatively low torque figures. Why don't the manufacturers quote torque? Good question. I suspect it is marketing. The typical buyer understands horsepower. "My SBC is rated at 310 horsepower". Yea, it's also rated at 5000 rpms. Whatabout 3000 rpm cruise? Uh, same horsepower there.
It appears a major power killer in marine engines is the exhaust manifolds. My experience, second is carb and timing calibrations. Lousy flame arrestors is right up there too. What's the air temperature of the air in your engine room? Cool intake air helps alot!
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