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General control line discussion => Open Forum => Topic started by: Robin_Holden on September 18, 2009, 03:56:40 AM

Title: Head Shims : Source Please ?
Post by: Robin_Holden on September 18, 2009, 03:56:40 AM

Greetings all from a drizzly Charente in S.W.France.

Can anyone help with a good source of cylinder head shims please ? Someone who doesn't mind sending overseas.

I'm hopeless at making my own !

Very much obliged for any contributions ,

Robin [ ex-pat Brit in the Charente full of ex-pat Brits ]

Title: Re: Head Shims : Source Please ?
Post by: Ralph Wenzel (d) on September 18, 2009, 05:51:52 AM

Jim Lee (See his ad in Vendor's Corner) offers a gasket cutter. I don't have this gadget, but everything else I've bought from him is topnotch, and he really stands behind his products, too!

Title: Re: Head Shims : Source Please ?
Post by: Robin_Holden on September 18, 2009, 08:25:20 AM

Ralph , very much obliged for the information,

Thanks ,

Robin.

Title: Re: Head Shims : Source Please ?
Post by: Phil Coopy on September 18, 2009, 10:11:18 AM

Actually Robin, if reducing the compression is what you are after,  adding head shims is not the best way to go in terms of 2 cy performance if the head has a squish band, because it moves it away from the piston reducing the squish effect.  Better method is to hog out the combustion chamber a little just above the piston.  Carl Shoup introduced me to this trick and with LA engines it works great. I have a jig built to do it on a lathe but you can do it easily with a Dremel and burr.

Pics below show a before and after of an LA40 head.

Phil

Title: Re: Head Shims : Source Please ?
Post by: Phil Coopy on September 18, 2009, 06:18:08 PM

bump

Title: Re: Head Shims : Source Please ?
Post by: Steve Helmick on September 18, 2009, 06:56:51 PM

Todd Ryan sells custom made head shims.  H^^ Steve

ryancompetition at aol dot com