Gasket!

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maybe this can help,I have a cy29rc and I bought a copper gasket for it when my black rubber gasket blew out, I ordered it from ddm, I talked to the guy and he said with the motor i have I need to go with the .040 gasket and that was the stock gasket thickness for the cy29rc
 
Copper doesn't have a lot of give, even after annealing. I tried using it with my 27.2cc and I tossed it cause I couldn't get the squish within specs. Now I'm using the blue gaskets until I buy a 4-bolt Zen.
 
Like deluge said copper doesn't squish like the blew gaskets so because my motor had a 2mm stuffed crank I had to go with the .040 copper gasket, to let the cylinder sit just enough higher so that my piston didnt hit at the top, if you have a stock crank then you can go with the .020 gasket one think to do is heat the gasket to make it nice and soft and use a really thin coat of copper gasket sealant, oh and i almost forgot before you heat it place the gasket on the motor and check that the gasket doesn't hang over into the motor then take your cylinder and put the gasket up to that and also check that it doesn't over hang, trim it so no areas of the gasket is overhanging inside the motor you should be set .
 
You need to use a .020 to maintain proper squish clearance (piston/cylinder clearance) when running a stock cylinder and crank. The .040 gasket is designed to push the cylinder up another .020 if you want to run a +2mm stroker crank. Alot of race ported heads nowdays such as ESP and Oneill's have already machined the head for a stroker crank so you can use the stock .020 gasket.


There are also high compression gaskets which are thinner than .020 which basically lowers the clearance (squish) and creates much higher compression. Be careful when doing this. It's easy to lean seize and engine with high compression. The preformance is very very noticable, however, a candle that burns twice as bright burns half as long. I don't like running high compression. It's like having a high maintainance wife that's always nagging ya for money.
 
chevy said:
Like deluge said copper doesn't squish like the blew gaskets so because my motor had a 2mm stuffed crank I had to go with the .040 copper gasket, to let the cylinder sit just enough higher so that my piston didnt hit at the top, if you have a stock crank then you can go with the .020 gasket one think to do is heat the gasket to make it nice and soft and use a really thin coat of copper gasket sealant, oh and i almost forgot before you heat it place the gasket on the motor and check that the gasket doesn't hang over into the motor then take your cylinder and put the gasket up to that and also check that it doesn't over hang, trim it so no areas of the gasket is overhanging inside the motor you should be set .
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THANKS Tons for this Chevy..I will get some copper gasket sealant..I have a 30.5 w/ 2mm stroker w/ .040 copper gasket (came as a kit) I plan on rebuilding my engine when it starts to get F'in cold (much colder than normal.. :rolleyes: )
 
dodginbulls said:
what was ur wife's email obeast i need to send her a copy of this :D :D:D
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I already showed her, and I will have a bruise to prove it! :D


Also, I thought the copper gasket were already annealed, weren't they?
 
I would use the 20 and find this sealant it works good with the cooper gaskets let it dry for abit before you install the head rob64n has put it on three motors it is holding up great no leaks :D :eek:


PB170155.webp
 
might have been lucky, but with the new hy 30.5cc i was able to use the .012 copper gasket and i did have to do some trimming to get it to fit the cylinder, but if you have seen my videos it runs awesome.
 
I had to anneal mine it was really ridged when I got it and like rob I had to trim it when I lined it up with the bottom half of the motor it hung over in a few spots and then I lined up the holes on the cylinder head and also had to trim a few spots, I ran about 5 tanks and my motors holding fine.
 
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