Any idea the compression ratio after milling off the chamber? I imagine it's Race Gas only now especially with a turbo. I'm no motor expert so correct me if I'm wrong, but I thought with forced induction it is better to stay away from high compression and small chambers with sharp edges to reduce hot spots and pre-detonation?
BTW - The work in the ports is nice. I'm suprised there was that much thickness in those areas. Beautiful work!
That's the Stock Deck Finish, since I planned on running big boost we did not take anything off the deck we did not want to raise the compression. I would like to do a 0.002" cut to give a better deck finish, but in this case we chose not to seeing how even with the shim the comp is still around 10 to 1 on the S. After my custom CP pistons I was running about 8.6 to 1 with this head.
That things gonna kick a$$! As much as I'd love the power, I'd only want to add turbo and what ever else to keep on pump gas. Also, adding that much power to these machines, will the drive train start falling apart? Didn't Mike already gernade his front end? I'm not just a dunner, so I would like to add as much power as I can and still be able to rock crawl reliably. Can't wait to see that thing rip through the dunes.
Going with a ported head will not keep you from running pump gas and will NOT increase compression unless you specifically requested it to be ported that way. All it does is make your engine breath a lot better and run more efficiently.
One thing that Mike and I will agree on is that the RZR driveline will hold up great to at least 130hp. That's what the Weber is rated at and he's been beating the heck out of everything else that's stock. The only weak point that I know of is the front diff roller cage. I already swapped my plastic cage out for the billet one from Holz so that I won't run into that issue.
I've been racing and duning with about 120rwhp and have had no driveline issues yet and remember that's 120 to the wheels and not the fly wheel like the Weber. Mine is an extreme case and the most powerful stock block UTV and so far the driveline has held up great!
