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General => The garage => Topic started by: elnigel on 27 February 2004, 03:53

Title: cylinder wear
Post by: elnigel on 27 February 2004, 03:53

I compression tested my gti. I got 100 psi on all cylinders, which improved on the wet test showing that its the cylinders.

Ive reconned the head but want to know what i can do with the cylinders as i dont want to take the block out and get a rebore.

are there different piston rings that i can get to restore compression? and if there are where can i get them from?

Thanks

Title: Re:cylinder wear
Post by: richandhazel on 27 February 2004, 12:09

Are you losing oil? I believe you can get oil control rings for worn engines that help prevent the oil loss but I doubt they will do much to restore compression. Having said that, 100psi isn't that bad, how's it running? Is the crankcase breathing heavily?

Title: Re:cylinder wear
Post by: elnigel on 28 February 2004, 01:07

no crankcase breathing is ok, its just burning oil, ive just done the valve guides and oil seals, kinda wanted to sort any cylinder problems whilst the engines in bits.

where sells oil control rings.

problem is i bought the car in this state to do up so have hardly driven it!

Title: Re:cylinder wear
Post by: mk1 on 28 February 2004, 07:21

Drop the sump off and push out the pistons, hone the bores and fit new rings and crank shaft bearings. If the head is done properly, end of oil consumption :).
Steve.

Title: Re:cylinder wear
Post by: elnigel on 29 February 2004, 03:03

sorry to keep botherin you guys but how do you hone the bores with the engine in situ?

will re ringing it also help it start when its hot as it doesnt at the moment?

Cheers! ??? :D ???

Title: Re:cylinder wear
Post by: mk1 on 29 February 2004, 10:10

Honing the bores is not the same as re boring. You use a honing tool to remove the glaze from the cylinder walls, this allows the new piston rings to bed into the bores. Poor hot starting could be caused by many things, worn rings is one of them. I have stripped a lot of engines and most of the time the cylinders and rings are ok (allways fit new rings if you are that far in) , look carefully at the cylinder walls for scoring and other damage.
Steve.