Don't need to calculate it. Any decent machine shop will have the max
that can be taken off the head, so the shim thickness would be that #,
if he wants to return it to stock. Presuming his head has been shaved
to the max, of cuss. (G) Also, there's a thickness figure available for
the stock head. Can measure and subtract; er, I guess that's a
calculation. ;^)
OTOH, the machine shop should know if there's a headsaver shim
available, too.
CR
Max Heim wrote:
>
> You could have a solid metal head gasket made, thick enough to lower the
> compression ratio. The question is: how thick do you need it? It could
> probably be calculated by an experienced mechanic.
>
> Max
>
> jon.arikstad@merkantildata.no had this to say:
>
> >Its 'EU kontroll', (MOT), yesterday.
> >2 years till next time
> >
> >I still have problem®s with pinking, I know I need a setup on a rolling
> >road, but I asked the workshop to look into it.
> >
> >The good news,
> >all cylinders had the same compression rate.
> >
> >The bad news,
> >compression is 13:1 !!!!
> >
> >I know that the PO ( I think I will call him PO), had some cylinder head
> >work done at a workshop that hm.. what
> >should I call them.., and I know that the PO said 'yes' when they asked if
> >they also should raise the compression,
> >
> >but 13:1 ???
> >
> >I have had a real expert to look at the head. His remark was, 'everything
> >looks OK, but I think someone has taken to much off it.'
> >
> >I can use double syl. head gaskets, and change oil, and head gaskets
> >regularly.
> >I can do some more work, on the cyl head, make the combustion chambers
> >bigger.
> >I can by a new cyl. head ( ouch £££ )
> >
> >I have a weber 45dcoe, carb. I will try larger main /air jets They are at
> >155/170 today ( setup from Moss, UK)
> >Have a nice looong weekend, thanks for all help I have got so far
> >
> >Jon Arikstad
> >1970 Pinking GT
> >
> >
>
> --
>
> Max Heim
> '66 MGB GHN3L76149
> If you're near Mountain View, CA,
> it's the red one with the silver bootlid.
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