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850 Compression Ratio
Posted: Fri Feb 05, 2021 4:58 pm
by gs.davies
I’ve got a standard 850 head that needs a light skim to remove a bit of surface corrosion. Is there are benefit in getting a more drastic skim done to increase the CR over standard?
If so, how many thou?
Re: 850 Compression Ratio
Posted: Fri Feb 05, 2021 7:19 pm
by mk1
If it is otherwise standard, there is no point in doing any more than a skim to get it flat.
Re: 850 Compression Ratio
Posted: Fri Feb 05, 2021 9:46 pm
by Dearg1275
I disagree. Raising the compression ratio increases the combustion efficiency and produces more power. The down side is that you will have to use a higher octane fuel or retard the ignition (which defeats the object). If you can run a higher octane fuel then going to 9:1 can only be good news even on a standard 850. Every little bit helps on small bore engines.
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Re: 850 Compression Ratio
Posted: Sat Feb 06, 2021 1:07 am
by bwaminispeed
You can go 50-60 thou on an 850 head, without problems, on regular fuel.......