Valve shims

[keg]

Just a quick one will I need new shims when changing the cam to a bigger one? or will i get away with the existing shims?

[Graham]

maybe, its all depends on how accurately ground the base circles of the cams are

[Sam-Q]

you might be able to mix and match with what you have. The set of 16V cams I did last required about 10 to 12 thinner shims to be installed. I had a friend supply a good choice of thinner shims or else I was going to just surface grind a pile of them.

[M11rf]

I was told that the std ones are usually fatter than required, so If you have a file as wide as the shim, you can rub it on the file and take some off it to get the right size.

[Sam-Q]

I was told that the std ones are usually fatter than required, so If you have a file as wide as the shim, you can rub it on the file and take some off it to get the right size.

a file!? I hope your being sarcastic

[Erikmex]

a file!? I hope your being sarcastic

A precision file? Are shims not also hardened?.

[M11rf]

File them down on the underside, don't see the problem... As long as you keep them flat on the file.

[Graham]

shims are hard, a file will take weeks to thin them and the chances of keeping the faces parallel are slim, they need to be surface ground