Thread: Dropped Valve
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notmytarga notmytarga is offline
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Join Date: Jun 2002
Location: Northern (UpState) CA
Posts: 930
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Thanks for the sympathy - I faired well considering the possibilities. My brain got sidetracked with the whole JE High compression piston and 964 cam grind option so I was only really disappointed that the #1 cylinder is minimally scarred and not perfect like the others. Obviously I have more to worry about and soon will be finishing the case disassembly and report on the main bearing condition and whatever else I find in there. The #1 rod looks okay in the spigot but I'll soon know more.

There seems to be something at the base of the headstuds - timecert? - I didn't think this engine had been apart till I found sealant behind the cam O-ring on the Right - please look at the earlier picture and tell me I'm wrong.

The options as I see them:

Starting position -
--One 911/44 (1975 CA CIS 2.7 L engine 54 K mi with # 1 piston and cylinder wasted, #1 head likely unrepairable. Original Engine.
--One "rescued" 911/44 long block with exhaust and trashed CIS of uncertain history which I got running (with my CIS) but it smokes badly and I could only remove one of the head air injectors - makes me suspicious.
--A desire to successfully complete a rebuild but not break the bank.

Any rebuilding will entail valve guides with complete head rehab, & case savers, possible align boring.

1 - Rebuild original engine with all new P & C's - keep original compression and Cams - obtain head to replace #1.

2 - Rebuild original engine with JE pistons and use head and cylinder from 'rescued' engine. 964 grind on cam. Is this a mistake in California?

3 - Rebuild original engine using best parts from "rescued" engine - specifically # 1 Piston, Cylinder and Head.

4 - Purchase a third engine - - (But I really want to do a rebuild.)

4A - A 3.0 or 3.2 of unknown condition.

4B - Purchase running 2.7 for $2000 ship it from MA to Redding CA.

5 - rebuild 'rescued' engine - I'm sure this case is tweaked.

Please feel free to add to these options and help me clarify my next steps. I think I see a spreadsheet with $/HP gain as the final calculation.

Another thing - the only German Machine shop here is mostly VW aircooled (loosely tied to the Bus Boys of VW Van fame) - I visited him and he could do most of the head and casesaver work. He did the work on his '72 rebuild and showed me the specification notebooks amoung his library. Would any of you consider this or should I plan to deliver or ship my parts to the north or south.?

Another picture - because I know I like them - here is the damage to #5 close up. Fifty knocks and out the exhaust - that's 10 secs or so.

Old 01-31-2008, 09:19 PM
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