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copbait73 copbait73 is offline
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Join Date: Nov 2003
Location: Chesterfield IN
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Interesting concepts, one picks and chooses basic engine principles that increase volumetric efficiency once the turbo is bolted on. Why?

Typically, if one is hotrodding an N.A. engine, yes they employ these principles to effectively use the mass of air flowing in both the intake and exhaust system to deliver more than 100% VE. In effect it’s mild supercharging on the intake and extracting on the exhaust. These are the same concept but acting in different areas of the engine system. They are beneficial acting independently, or combined.
The fact they are at their best when combined (tuned) doesn't negate their potential postive effects across the entire power range.

Suction (such a stimulating term!). Just using it regarding your engine compartment can lead you down wrong paths. It’s best to say absolute pressures. When you consider absolute pressures the lure of the word suction goes way and you are only looking at slugs of air, N.A. or turbocharged.

What changes once you place a turbo in the flow path? If you say the turbine represents backpressure then every N.A. street machine hotrodder with mufflers and tailpipes are only kidding themselves?. They should save their money because you can only see benefits when exhausting into open atmosphere? But then open atmosphere is 14.7#, isn’t 14.7# real pressure................

Last edited by copbait73; 01-17-2010 at 02:22 PM..
Old 01-17-2010, 01:43 PM
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