Oops - head space a little crowded!

[jimb12]

set deck height no thinner than 0.040"

Are you telling him to set the pistons at least .040" below the deck surface or are you actually talking about piston-to-head clearance that includes the head gasket thickness here?

 

[Guest]

Hi Guys,

I finally got around to taking the head off and checking the "deck" setting (I measured between the top of the piston and the surface of the barrel when the pistons were at TDC). It looks like part of my problem is here - the reading I get is 0.019" - well under the recommended setting of 0.04" from Trippivot.

I'm thinking I could bring the deck height up to closer to standard with a second 0.02" thick Cometic copper cylinder base gasket (see here: http://www.dynoman.net/engine/gaskets-cometic.html#gs1000) - each 0.02" thick.

So if I'm getting 0.019" with a standard paper type gasket, I should get around 0.039" by using 2 gaskets.

Would this work? What do you think?

If I can get the deck height right I'll then start looking at degreeing the cams. Does anyone know the angles for a '79GS1000S

Ian

You are misunderstanding what Tripp is telling you. You need .040 head to piston clearance not the piston to deck measurement. The piston should be .008 from the top of the cylinder deck when using a .032 head gasket and the piston should be .003 up above the cylinder deck when using a .043 thick head gasket. I myself don't like having the piston above the deck and would be happy with flush
With your .019 measurement I would leave it and be happy with the extra clearance unless you are wanting every last bit of power