Oops - head space a little crowded!

[Guest]

When you decked the cylinder and or the head it will change your cam timing slightly you need to degree the cams in to get them right. I myself would not put a motor together without degreeing the cams in. When I checked my 98 Bandit cam timing when it had stock cams in it set at the stock timing marks they were at 99 intake and 105 exhaust which hurt the performance of the motor. I think the factory setting is supposed to be 102/105. I set them to 103/105. You need to slot the sprockets or you can't change the cam timing from the drop in setting which is off of the factory setting most of the time.

[IanR]

When you decked the cylinder and or the head it will change your cam timing slightly you need to degree the cams in to get them right. I myself would not put a motor together without degreeing the cams in. When I checked my 98 Bandit cam timing when it had stock cams in it set at the stock timing marks they were at 99 intake and 105 exhaust which hurt the performance of the motor. I think the factory setting is supposed to be 102/105. I set them to 103/105. You need to slot the sprockets or you can't change the cam timing from the drop in setting which is off of the factory setting most of the time.

OK - I think I'm out of my depth here. I might take the engine to someone who can do those things. Your'e right - there's no point in spending as much as I have without making sure that everything is as it should be!

Thanks
Ian

[IanR]

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/gasket...ic.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

[sharpy]

This is the info for all your "big words"

http://www.webcamshafts.com/index_blank.html?pages/cam_glossary.html

And if you look on this home page for degreeing your cams it will tell you how.

http://www.webcamshafts.com/

[Guest]

you might need adjustable cam sprockets to set the cams as when the head is skimmed it moves the valve timing

[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/gasket...ic.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