Lowering/Grinding Cyclinder Head on CLIO 2 RS 172 PH2

[prodriv3r84]

Hi guys, I will rebuild the cylinder head, Can I remove or grinde the material from the bottom? How much? I have 421 Cams with standard pistons,

Cheers

 

[White16valver]

You want to skim the head?

You need to know the clearance between the valves and the pistons!

I have not read the manuals but the information may be in here somewhere
https://www.cliosport.net/threads/download-manual-2002-clio-172.819846/post-11626649

 

[prodriv3r84]

Yes, skim the head. I read the manual, I know some that skimed the cylinderhead about 0.3mm.

I would like to know if anyone has already skimed the cyclinder head wiht catcams 421 and std pistons.

Thanks

 

[Simon998]

Put some putty/plasticine on the dome of the piston and rotate the crank. Then measure the thickness of the putty afterwards. This should let you know roughly how much you can take off the head before the valves come in contact with the piston domes.

 

[prodriv3r84]

Thanks. I will try it.

 

[Simon998]

It's an old trick used on motorcycles but works for cars too. I had to do it after I had my 106 rallyes head skimmed and I was afraid of the valves hitting the piston crown.

A light spray of some lube (wd40 or whatever) on top of the putty helps to stop it sticking to the valves and makes it easier to get the putty off the piston afterwards.

 

[prodriv3r84]

Thanks