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valve recession?
Posted: Fri Oct 25, 2013 6:43 am
by Speedwell Sprint
I have an original 163 head where the valves are quite deep. Top of valve heads are flush with the combustion chamber. Is this too deep? Any problems with this? Thanks
Re: valve recession?
Posted: Sat Oct 26, 2013 10:45 am
by lisian_1275
I assume that this is after the seats have been cut?
They will be fine, it is only when they pocket down below the combustion chamber floor, then you would need to go to the next oversize valve ( which can be a challenge with a Mk 1 's' head.
Thanks
Ian
Re: valve recession?
Posted: Mon Oct 28, 2013 8:39 am
by andy1071
This will cause the valve to be shrouded, as it starts to open, and before closing.
-This will cost power
-it's the same as fitting a lower performance camshaft...
Re: valve recession?
Posted: Mon Oct 28, 2013 9:05 am
by Vegard
Fit inserts, then the 163 may live longer as a bonus.
Re: valve recession?
Posted: Mon Oct 28, 2013 9:56 am
by Speedwell Sprint
Thanks for the replies. I figured the head was done for. The machine shop set them all at the same height... bummer!