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Old 02-06-2021, 12:55 AM   #4
Brian
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Join Date: May 2010
Location: Masterton, New Zealand
Posts: 3,835
Default Re: I'd like to start a new thread on the components used in building a flathad

Good idea.
Camshafts; many people make the mistake of overcamming their engine. For a street driven engine that will predominantly be cruising at say 60 MPH, ideally you want the engine developing maximum torque at those revs, then it is running most efficiently, giving best fuel consumption. No use having a cam that is nowhere near it's 'powerband'. Do some arithmetic, calculate the RPM's of the engine at your chosen speed, factoring in diff ratio and rear tire diameter, and select a camshaft that is designed to give power at those revs. Do not choose a cam simply because it sounds good whilst idling.
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