newprotest.org: COMPRESSION RATIO?

COMPRESSION RATIO?

February 08, 2007
by: jovial_cynic
I'm trying to figure out how I came to a 9.5:1 CR calculation that I mentioned early on in this project.

Right now, I've entered in some stats into the CR calculator, with the following values:

Bore size: 87.75mm (Z22 bored out .75mm)
Stroke: 86mm (L20b crank)
Headgasket bore: 88mm (that's a guess; I just figure it's gonna be 1mm over the stock bore)
Compressed gasket thickness: 1.2mm
Combustion chamber volume: 42.5cc (A87 head)
Piston dish volume: -9.32cc (stock Z22e pistons, but they are shaved down a bit...)
Deck clearance: .2mm over deck (shaved down from .4mm)

The calculator says I'm going to run 9.98:1 CR, which is a bit higher than I originally calculated. Weird.

I had considered running a turbo or supercharge previously, but with the CR so high, I think I'll wait to do that with another engine in the future. 9.98 is probably just fine for an old NA datsun engine.
np category: 510
tags:

COMMENTS for COMPRESSION RATIO?


add comments. you are limited to 5,000 characters:

<< your name
<< your email (won't be displayed)
<< your website / location
<< type these numbers: 936428 (plus 0NE)

(html -enabled- / no scripts)

<< Comments temporarily disabled >>

Rules: Don't spam. Don't harrass. Don't be a jerk. Your IP address (54.225.28.32) will be logged.