From: darling@simlab.arc.nasa.gov on behalf of Dave Darling [darling@simlab.arc.nasa.gov] Sent: Tuesday, March 30, 1999 9:13 AM To: Marc-Andre Morin Subject: Re: [914] 2.0L Head question >Can this surface be "rebuilt"? Hopefully you can find a good local machine shop. If you can, take the heads to them and ask. If not, you may have some luck taking photos and sending them off to whatever shop you were thinking of having do the work. I guess the simple answer is that *any* heads can be rebuilt. The SOP for fixing cracks in 2.0 heads is to cut out the cracked metal, then build the head back up through welding, then machine back down to the correct shape. If that can be done, I would imagine just about anything can be done--for a price. >Option 2: >I figured after reading that one way would be to get the head machined so >that the surface is flat. This will reduce the combustion chambers volume, >and put the cylinder and piston deeper into the head and increase the CR >(right?). I >know i'll need shims to compensate for the deck height. I'd go get a set of >stock piston 7.6/1 being afraid that going Euro would bring the final CR to >high. The Euro P&C set is likely to be cheaper than the US-spec ones. So it may be a good idea to go that route anyway. Then do all the calculations to determine the CR and the CR you want. (Jim T's spreadsheet will help a lot on that; ask him about it.) Then use shims at the cylinder base to bring the CR to where you want. That will most likely be somewhat less expensive, plus you may need shims anyway depending on how much material gets removed. Good luck! --DD Dave Darling 74 914 2.0 (VROOM!) darling@simlab.arc.nasa.gov <--- OR ---> ddarling@wgss.com "914: The Porsche Picnic Basket. A lid that opens on each end, and a handle in the middle.." -- CHD