TwinTurbo.NET: Nissan 300ZX forum - Will someone please explain this to me...
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Subject Will someone please explain this to me...
     
Posted by HawaiiZXTT on April 03, 2005 at 12:19 AM
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Message after some thinking, and reading about ConverTT's project, I still don't understand this (probably) simple concept:

why do high compression (NA) motors have problems when boosting? I understand the mechanical differences between a TT and NA motor, but won't a TT cylinder see the same kind of compression figures when boosting, say, at 20psi (or higher)?

Assuming: identical block/crank/heads/injectors...etc. only thing varying is the piston dome (compression ratio)

Is it because the compression (psi) is so much higher in a NA cylinder versus a TT that pressurizing the intake air on an NA will cause the mixture to exceed the point in which the fuel will pre-ignite? (which is above the cylinder pressure right before ignition on a TT motor @ high boost)?

please explain...thanks for reading!


'90ZXTT Black on Black

     
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