Originally Posted by
Richardcard1974
Originally Posted by
Evogone
Originally Posted by
Richardcard1974
Originally Posted by
Evogone
Originally Posted by
Richardcard1974
Not worth the expense in my opinion.
Why not ? on all my previous car i have made 20-25hp just through working the head, "cnc heads/ric wood" are very good. 1.9 205 / 16v redtop etc...
There must be gains to be had....?
Because of the simple fact that the williams head is already well made and it cannot be ported to give major gains.
25 bhp is fantasy island territory for a williams for headwork.
With mild cams and headwork you will make realistically about 15 -20 bhp
Most williams in this spec will be running about 170 - 175 bhp. A rebuild will probably give you another few bhp on top of that.
At most youll get circa 5 bhp from porting. You can get more from changing the valves sizes, but stan will know more about this than me.
Im sure APD have done cars with 190+hp with just headwork and cams.....
Im sure he will comment..
Big valve head innit.
190 from headwork (porting) and cams is lala land dreamer town.
Nope, big valves werent required for the level of spec.
My williams headwork, catcams 5502225,
wossner forged pistons giving 12.5:1 Cr, and a PROPERLY built engine, not just cobbled togther...but proper attention to detail on all clearances (this makes a considerable difference alone).
This made 192/193bhp or there abouts. Which is coincidentally 5% more than the same spec without the pistons. 5% being the theoretical gain from 2.5 points increase in comp ratio.