Board logo

how much dose a pinto head gaket squish by
jpindy3 - 30/5/09 at 09:45 PM

with std bolts,the std gasket thickness is 1.3mm,would anyone know how much it squishes by???

thanks

MautoK - 30/5/09 at 10:15 PM

Just measured (micrometer) the gasket I took out the other day - 0.050 to 0.051 inch. New one is 0.055 to 0.057 inch
Measured metal lip around the bores.
0.050 is 1.27 mm
0.056 is 1.42 mm

John

snapper - 31/5/09 at 07:55 AM

Standard gasket is 1.62 crushed
Felpro blue or Adjusa are 1mm crushed
Cometic do (in inches)
0.026, 0.030, 0.035, 0.040, 0.045, 0.051,
0.060, 0.065, 0.071, 0.074, 0.120

MakeEverything - 31/5/09 at 09:05 AM

Does it really matter? As above, the differences are negligable. I never understand why people waste time trying to find this stuff out - Or maybe im too impatient!

Volvorsport - 31/5/09 at 09:17 AM

quote:
Originally posted by MakeEverything
Does it really matter? As above, the differences are negligable. I never understand why people waste time trying to find this stuff out - Or maybe im too impatient!


err , squish and compression ratio .

get the squish dimension wrong and when the con rods elongate at higher rpm , pistons hit the head .

squish is one of the most important factors along with plug position on combustion chamber design .

As mentioned above measure your deck height , then choose the appropriate gasket from cometic .

jpindy3 - 31/5/09 at 12:04 PM

quote:
Originally posted by Volvorsport
quote:
Originally posted by MakeEverything
Does it really matter? As above, the differences are negligable. I never understand why people waste time trying to find this stuff out - Or maybe im too impatient!


err , squish and compression ratio .

get the squish dimension wrong and when the con rods elongate at higher rpm , pistons hit the head .

squish is one of the most important factors along with plug position on combustion chamber design .

As mentioned above measure your deck height , then choose the appropriate gasket from cometic .


thank you,
what i am doing is makeing the cr lower for a turbo,so i need a thick head gasket

MakeEverything - 31/5/09 at 02:18 PM

Most people doing this would use a precision decompression plate????

jpindy3 - 31/5/09 at 05:01 PM

quote:
Originally posted by MakeEverything
Most people doing this would use a precision decompression plate????


no most people would use cossie rods pistons to lower it,or start with a low cr block witch i have but i am slowly rebuilding it,with cossie rod and pistons to get 7.5:1,but i am going to start with the vulcan pinto witch i have in my mk,now this is 10.5:1 as it has been tuned,so i have a decomp plate that is 1mm thick and was going to use 2 head gaskets,to get it around 8.5:1,i know this is a bodge its just untill i get the other engine up and running,but as im only going to start low 12psi max, then with my new engine i will put the boost up higher.

[Edited on 31/5/09 by jpindy3]

Volvorsport - 31/5/09 at 07:33 PM

volvo produced a kit to turbocharge carbed models - they used two headgaskets - the only service change was to re torque the head bolts every 6k .

headgasket wants to be the weak link - if not its usually the pistons /rods , so for a start off its not a bad idea .

In an ideal world youd fit Low compression pistons - so you get the squish/deck height ( which has more to do with preventing detonation) perfectly right for teh rods/pistons you have installed .

theoretically , this is the engine you could run the most ignition advance with .