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Registered
Join Date: May 2008
Location: Merrimac,WI
Posts: 895
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Engine Test Run
Engine builder brain trust. Bought a long block eight years ago, said to be rebuilt. 2.2L E with S pistons and cams. Had John Dougherty grind new Mod Solex Cams since the engine still has E heads...All good. Last year after new cam timing/rocker etc. did a leak-down and all cylinders could only come up to 70%. Good thing at least all the same.
I had mention this on an earlier post and most said leak-down number won't say much at this point. Now, finally ran the engine on a test stand to brake-in cams and see what I have. I also have new PMO's, S distributor, MSD ignition. Ran great, no leaks, carbs adjusted, brake-in oil 20-50 Valvoline. Did leak-down after a half hour running (2000 rpm). Nice, four cylinders now at 4% and two between 12 and 14%. Not bad considering I was at 70% and still no Load being added. Now the big question, the drained oil looked like ****, looked like lots of metallic. Oil drain plug only had the average little amount of smudge. Why does the first oil look so funny. Thanks, Mark
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1974, 914-6 GT Tribute 2007 Cayman S 1998 993 Carrera S, speed yellow (Yellow Bird) gone but not forgotten. 2017 Golf Sportwagon 4motion Exclusive source for the 914 Umbrella and Service cover |
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09-24-2020, 12:16 PM
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Registered
Join Date: Jul 2005
Location: Atlanta
Posts: 1,241
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As long as the metallic flakes are not chunks then you're fine, totally normal. I normally see what looks like tiny metallic splinters the first oil change, which I always do after breaking in the rings. I stick with non-synthetic until at least 500-600 miles, but that first oil change is always after first running with some load, say 50-100 miles. As for the cylinders with some 15% leak, where from? If from the valves, more running may or may not resolve.
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No physical quantity completely explains its own existence Last edited by lvporschepilot; 09-24-2020 at 04:56 PM.. |
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09-24-2020, 04:51 PM
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Registered
Join Date: Mar 2004
Location: Windsor, CT
Posts: 2,119
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Cold, never run, engine leak down? Only asking for a bad answer. Rings are not seated.
After running the oil has some wear, rings breaking in, hence some shiny stuff. Isn’t break-in lube typically dark grey. That gets flushed out. You may have a problem, but until the rings seat you will have more leak down. Where is the leakage going? Out the exhaust? Out the intake? Into the crankcase? Or worst scenario: between the head and cylinder? Need more data. |
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09-24-2020, 04:53 PM
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Registered
Join Date: May 2008
Location: Merrimac,WI
Posts: 895
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Thanks Ivporschepilot and VFR750, and the leak is from the rings on the two cylinders (engine breather). Best, Mark
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1974, 914-6 GT Tribute 2007 Cayman S 1998 993 Carrera S, speed yellow (Yellow Bird) gone but not forgotten. 2017 Golf Sportwagon 4motion Exclusive source for the 914 Umbrella and Service cover |
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09-25-2020, 05:35 AM
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