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Registered
Join Date: Sep 2003
Location: Central Washington
Posts: 527
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Exploding 914 Engine?
Hey guys-
Heres the deal...recently brought a Type4/914 1.8L longblock home from a friends house, he got it from...forget that part. Anyways, hooked it up to starter jig, checked valves, it turns over a little "stiff", like more than just compression, but its doesnt smell burned, doesnt 'clunk', no end play, distributor drive is 180 off, I hooked up electricals and decided to fire it up. *BAM* blew BOTH valve covers and oil filler cap off. Hmm...checked firing/plug wire order, timing, valves... *BOOM* same thing. LOTS of white smoke. It looks like a well run engine, I've watched the valve train open/close and it seems to be crank/cam timed correctly. I've worked in a couple german auto shops for 8 years total, and had the occasional backfiring,- never blown the valve covers off an engine. I'm using the 2 barrel weber...009 dist, blue coil. Any Ideas...? Thanks ! Robert O 70 914 UPDATE- well der distributor drive wasnt exactly 180 degrees out. somewhere below that...anyhow, retarding timing a random # of degrees helped, and I got it running, ...and I think someone got locked in there because they're knocking pretty hard to get out!!Thanks anyways! Last edited by 914Ghost; 11-06-2003 at 12:38 PM.. |
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11-06-2003, 11:48 AM
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Join Date: Nov 1998
Location: antioch, ca, usa
Posts: 1,082
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hole in piston, causing the air/fuel to explode into the crankcase instead of pushing the piston down....
just a guess, I've had this happen on another car before, scared the crap out of me when the valve cover blew apart, it was an aluminum valve cover, luckly I didn't get hit by any of the flying pieces 
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'73 914, 1.7, with Boxster transmission in the future? 
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11-06-2003, 12:15 PM
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Registered
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,697
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How about some pictures or even better a short video. That would be great to watch....
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11-06-2003, 01:23 PM
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Join Date: Jun 2003
Location: Fresno, CA
Posts: 7,769
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IMAX or at least Dolby Surround
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11-06-2003, 01:31 PM
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Sounds like a crankcase ventilation problem. You got a backfire, which because of either a missing or defective flashback arrestor, or a missing or defective PCV valve, allowed the flame front to propagate to the heads or to the crankcase, where it ignited the hydrocarbon vapors from the oil. It's more likely after lots of cranking, because plenty of the gas is getting past the rings and/or valve guides, and is getting into the oil.
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11-06-2003, 02:32 PM
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1970 Porsche 914 2.0L 
