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#102 (permalink) |
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former opel racer
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Rally Bob's recommendation is to angle mill the head .080" on the spark plug side, zero or minimal on the manifold side. The quench area is not affected, only the volume of the chamber, and the timing of the camshaft. To affect the quench area you mill the block to give a maximum of .005" of piston sticking up above the deck. This is to increase CR, but I know the reason you are asking. This might work, it's worth a try. Yes you must spot face the bolt holes. No big deal. Be sure to grind some more room around the chain as mentioned before, you will appreciate this later, believe me!
The dimension of the head, from the deck to the valve cover, is unpublished and we need to keep it that way, OK? It comes up every time we discuss this. This is not just me asking, it was asked of me by several of the best known Opel racers. You know, the famous ones, er, the ones you see on TV sometimes. I hope this will fix your head. If not, the bigger gasket will, but then we'll have to talk you into going to the bigger bore to match! And the 2.2 stroke... oh and longer stronger rods... and the light flywheel... where does it stop? |
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No Opels were harmed in the filming of this movie. However two Mustangs, a Pinto, and a Capri were hospitalized. One Mustang was euthanized the next morning. |
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#103 (permalink) |
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Opeler
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In over my head?
Ugh, several months ago I bought a rebuilt short block and an old head with "bigger" valves and a "reground" cam. I'm planning on reusing the timing chain. My problem is that I have no idea how much of the block was milled, I had the head decked and I don't know how much came off at that point or how much may have been taken off previously, and I don't know anything about the cam. My head hurts after reading the 5 pages of previous posts...can I bolt this thing back together or is that just a bad idea? Where do I start?
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#104 (permalink) |
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1000 Post Club
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Timing chains are CHEAP! Unless that thing has almost no miles on it I would think about a new one. I lectured a student on the evils of trying to save a dollar by using the old timing chain set in a Ford. After his had jumped time. I did the same thing later on an Opel because I wasn't going to keep it that long. That darn car ran and revved sooo well! I was lucky when it broke, I was able to coast all the way into my parking spot in front of my apartment.
![]() NEW CHAIN, $20+/- ? Harold |
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#105 (permalink) | |
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1000 Post Club
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Harold |
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#106 (permalink) | |
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1970-GT
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http://www.opelgt.com/forums/opel-en...-1-9-head.html Lyle |
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#107 (permalink) | |
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Member 1000 Post Club
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Bad idea... new ones are available from many sources.. OGTS, RockAuto.com, Parts America, Napa... etc
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Paul
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#108 (permalink) |
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former opel racer
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What you've got is a modified engine. Without knowing just exactly how it's been modified, to assemble it you have to check everything. Everything as in piston height, valve clearance, valve timing.
It's just the basic engine building/blueprinting procedure. |
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No Opels were harmed in the filming of this movie. However two Mustangs, a Pinto, and a Capri were hospitalized. One Mustang was euthanized the next morning. |
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