Kevin Shasteen Posted June 12, 2002 Share Posted June 12, 2002 We all know that our engines loss of mechanical Volumetric Efficiency's range from 10%, 15% and some 20% VE's for the milder performance builds. My question is this; If you were to rebuild your engine, where would you consider your upgrade within that engine, if you wanted to do nothing else but compensate for the initial VE% loss in mechanical efficiency of your 'stock' engine's performance? In other words if you had an engine, regardless of its performance capabilities, which had a VE% of [x] and you wanted to compensate for [x] losses; where would be your approach in taking up the slack of that mechanical [in]-efficiency? Would you bump up your tire/wheel diameter [x] amount to match the VE% loss? Would you bump the cam's lift, duration or LDA's [x] amount: Or would you up your compression [x] amount? Even consider cylinder heads with [x] larger ports and [x] higher flow numbers? I'm curious what your thoughts are on compensating for the initial VE% losses of an engine prior to rebuilding that engine. Am I making too much of this since I dont have a V8 to swap in to my car; or is this a legit question? Kevin, (Yea,Still an Inliner; w/too much time on my hands) Quote Link to comment Share on other sites More sharing options...
blueovalz Posted June 12, 2002 Share Posted June 12, 2002 Kevin, I made up for any VE losses in my L6 by clubbing it to death with more volume - V8 MAN!. Seriously, Grumpy had some very nice in depth comparisons not too long ago about VE vs cam timimng, CR, rpm, and such. Very interesting read. Quote Link to comment Share on other sites More sharing options...
pparaska Posted June 13, 2002 Share Posted June 13, 2002 I agree with Terry. bore/stroke, rod/stroke ratio, cam lift/timing/lobe shape, head port/seat/chamber design, intake design and exhaust system define the VE of the engine (along with a few other things like quench, piston dome/dish shape, etc.) If you don't want to depend on those things alone, give mother nature a hand and add some boost! VE is a function of throttle angle, rpm, etc. It's not a constant. Your idea of changing tire diameter is one way to cruise, etc. in a better VE area that your engine has. Quote Link to comment Share on other sites More sharing options...
johnc Posted June 13, 2002 Share Posted June 13, 2002 Install a diesel engine and satisfy most of your VE phobias. Quote Link to comment Share on other sites More sharing options...
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