head bowls RV 8

desertrover · Post by **desertrover** » Sat Mar 15, 2008 10:11 am

Hi all,
I´m working on a new pair of cyl. heads for my 4.6 l in my LandRover 90 to replace the old 3.5 ones with 4.6 ones.
My question is:
The bowl ( combustion chamber ) is smaller than the diameter of the piston, the edges of the bowl are sharp and the shape of the bowl is not round, it´s 3 quarters of a full moon, if you can discribe it like this.
Does it make any sense to smoothen these edges?
The CR will be lowered by this kind of work, that´s fact I think.

Any pix of your heads for comparison?
Many thanx
and happy rovering
Stephan

Post by **katanaman** » Sat Mar 15, 2008 10:32 am

Removing the sharp edged can help reduce detonation and will affect cr very little. The sharp thin edges can get hot with obvious results. Just round the edge though , don't go putting a large radius on it. Kinda quick scuff with emery paper type thing. As for re-shaping the combustion chamber, only if you know what your doing. My JE heads for the most part are shaped as per factory, pics on my site.