Thicker Gasket, Compression??

[durallymax]

Im just curious if anybody knows what my compression has dropped to with the thicker gaskets I got from guy.

Now I cant even remember what they were but I believe they were .060 or something along those lines.

What they were before I dont know.

A lot of loose ends here see if you can help me connect the dots.

Like I said Im just curious.

and also since it is a little lower would this cause my truck to have its light blue haze at idle or is this still in my tuning?? Or possibly the modded rear cover and pressure regulator.

 

[McRat]

Guy has a calculator to figure it out.

You need bore, stroke, deck height, piston bowl volume, valve relief volume, and head gasket thickness.

 

[durallymax]

hmm well i dont know any of that except the gaskets thickness. everything else is stock so maybe there are numbers out there, if anybody has them im sure it would be guy.

 

[McRat]

Well, if the engine is stock, (iirc) the bore is 4.06 and stroke is 3.90 and CR is 17.5:1, uh, I get about 0.7 drop in CR for every .010" you increase the head gasket thickness. But I'd double check that.

 

[JoshH]

I'm guessing you put grade C gaskets in your truck. If your stock gaskets were the thinnest available (grade A), you added an extra .004 in gasket thickness. Based on my calculations, you dropped your compression ratio from 17.5 to about 17.2. That's still higher than LBZ stock compression ratio of 16.8.

 

[sweetdiesel]

Guy has a calculator to figure it out.

You need bore, stroke, deck height, piston bowl volume, valve relief volume, and head gasket thickness.

This one is a few years old