Extra hp out of my 340.

rumblefish360 said

I don’t think it is a fixed number but in general numbers are an OK assumption. Like an engine build, two identical engine equipment wise can turn out to different graphs. Same holds true for the equipment used on the engine and behind it. IMO, a general rule of thumb is a certain amount of power lost for useage of certain equipment.

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I guess I should not have used the word " fixed". I just think people get too caught up in percentages as a blanket rule. As my examples above point out. Lets look at it another way. If the drivetrain above cost, say., 70 horespower at 4500 RPM there would be a huge percentage differance between the 2 engines. If the 318 made it's peak 150 at 4500 RPM and lost 70 through the drivetrain that is a around 47 percent loss. If the 360 was making 250 horsepower at the same 4500 RPM , the same 70 horespower loss is 28 percent.