'85 engine spec - compression ratio.
Thread Starter
Racer
Joined: Jan 2012
Posts: 321
Likes: 16
From: Ontario
'85 engine spec - compression ratio.
Trying to figure out what gasket thickness to use with 64cc heads on the '85 engine. My understanding is the pistons are forged flat tops, but when I search specs I get all sorts of numbers.
Does anyone know what the piston clearance cc is for the flat tops?
This is what I got so far:
Does anyone know what the piston clearance cc is for the flat tops?
This is what I got so far:
Drifting
Joined: Jun 2020
Posts: 1,693
Likes: 727
From: Stay dangerous my friends
It should be close, try this:
Bore (Inches) 4.000
Stroke (Inches) 3.480
Connecting Rod Length (Inches) 5.7
Cylinder Head Volume (cc) 64
Deck Height (Inches) 0.025
Head Gasket Bore (Inches) 4.166
Head Gasket Thickness (Inches) 0.039 (FelPro 1010)
Piston to Cylinder Wall Clearance (Inches) 0.003
Top Ring Land Height (Inches) 0.25
Piston valve relief cuts (cc) 6
Few good resources of course as you've seen for static CR
https://diamondracing.net/p-10-compr...alculator.html
Then there are dynamic CR
https://thedynoguy.com/compression-calculator
Bore (Inches) 4.000
Stroke (Inches) 3.480
Connecting Rod Length (Inches) 5.7
Cylinder Head Volume (cc) 64
Deck Height (Inches) 0.025
Head Gasket Bore (Inches) 4.166
Head Gasket Thickness (Inches) 0.039 (FelPro 1010)
Piston to Cylinder Wall Clearance (Inches) 0.003
Top Ring Land Height (Inches) 0.25
Piston valve relief cuts (cc) 6
Few good resources of course as you've seen for static CR
https://diamondracing.net/p-10-compr...alculator.html
Then there are dynamic CR
https://thedynoguy.com/compression-calculator
