Originally Posted by
XRT_si
Just want to confirm a few rumours regarding ST170 engines as there's a lot of info floating about that no one seems to be able to confirm.
I have just bought a ST170 engine for turbo charging so...
Do they have uprated valve springs?
Do they have stronger or steel rods?
Are they higher comp. ratio?
Are the blocks any dfferent to standard?
What exactly needs doing to stop the VVT?
Anything else worth knowing? Cheers
Good man! Have a 170 turbo myself
Yes, they are stronger than normal Zetec springs but dodnt know the exact strength.
Yes forged rods. Mine held 291bhp without issue, although I upgraded later just to be sure.
10.5:1 ratio
Blaock wise I dont think so, although they do have oil spray bar for the pistons, which is a nice addition.
To truely eliminate the VVT you need to fit a venrier pulley on the inlet cam.
Anything else worth knowing: the heads are alot better than the Zetec's and dont need to be fettled. Dont use the standard inlet, as the rubber bungs come off the dual tract inlet and get stuck in the inelt runners. The port spacings are different from the Zetec, so inlets from those dont work. I got mine custom made by Danny B.
If you want anymore info let me know, as I went down this road about 3 years ago now... and I'm still loving it
