Originally Posted by
XRT_si
Interesting. Who built this engine? And what dyno was it on? Have you got a graph?
And why no shim on the exhaust side? I know they valve float on the exhaust side but what does this to do help?
i built it, GR performance did my fab work and mapping, dastek rolling road,
the shims pre-load the valve spring so it has more effort to stop valve float,
it is a bodge and the reason i didnt do it..
Originally Posted by
TomPengelly
Ive just bought a mk1 focus rs manifold, turbo and downpipe. 106 springs sound like a good plan then?!
106 springs work yes,
use 1.8 cams too.. longer duration but not too much lift,
they just work perfectly, and give a massive power band increase over turbo cams