How did you figure out the compression ratio?
jon.arikstad@merkantildata.no wrote:
> 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
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