Does any of You know how much ccm the compressed gasket space can be?
G
2011/3/21 Austin Healey <pajtamuvek@gmail.com>
> Hi,
>
> I have just collected my engine from my machinist (rebore, crankshaft
> reground, new cam bearings etc). For my greatest solace, he folloved all my
> instructions, soo all the clearances are accurate (=>
> hipp-hipp-hurrey!!!!!).
>
> Now I have made some measurements with the new pistons.
>
> I had to experience that the new reproduction pistons are quite a bit lower
> than the originals! If You can remember, my engine is a "26H", soo may be
> some kind of "special" engine. The original pistons came about 0.3mms *above
> *the dech height. The new pistons are 1.75mms below the deck.
> I am using a 12 port head (non-original to this engine, original lost). I
> have counted a rough 7.6:1 CR now with my new pistons. This is *very* low.
> Whats Your opinion: shall I get the block skimmed by 2mms, and get the
> pistons to the "original" height, skim the head, or skim both to get a
> higher CR? What numbers to go for? 9.5:1? Or higher?
>
> Gergo
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