TwinTurbo.NET: Nissan 300ZX forum - Compression Pressure Questions
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Subject Compression Pressure Questions
     
Posted by canyoncarver on November 03, 2006 at 10:01 PM
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Message I'll simplify the figures for determining the compression pressure at 15 psi of boost

I believe static compression pressure on a tt motor is ~174 psi. That is the number you read when you do a compression test. (174 / 14.7 = 11.84 * (14.7 + 15))
The cylinder pressure is closer to 352 psi.

My other post was leading up to this question......

With a cylinder pressure of 352 psi and a air/fuel mixture of 12.5:1...... How do I calculate the output of the combustion process?

I believe the result is in Btu/hrs which can be converted to h.p.

The google and internets can't comprehend what I want.

Thanx Geoff. I wasn't concerned with the vtc. They kick in ~3000 rpm to retard the valve timing and increase the c/r. I'm pretty sure the advanced valve timing, under 3k rpm, is utilized to lower the c/r to prevent detonation under low speed / high load operating conditions.


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