Sounds like oil getting sucked down one or more intake stems under vacuum and then burning under subsequent load. Check to see if that 1 in 3 times happens to be follow a longer-than-normal vacuum condition. ----- Original Message ----- From: Bob Bundy To: [email protected] Sent: Monday, July 21, 2008 7:42 PM Subject: Tailpipe smoking under load.
I seem to have one cylinder burning oil. But I'm having a horrible time trying to diagnose 1) Smokes on hard accel under load with boost only. Not at all under vacuum. Does it maybe 1 in three times it smokes a pretty good cloud and not every time. 2) Definitely have oil consumption but not a huge amount. Less than ΒΌ quart per tank I think a little more on the track. 2) Spark plug in #1 will have some sticky Oil residue but not really wet. Gets kind of gummy occasionally All others look perfect. 3) Compression test shows all cylinders within a couple psi of each other. 4) Leak down less than 5% at 100psi in all cylinders. 5) Absolutely no blowby showing up in my catch can on the breather side 6) Changing PCV valve made no difference. 7) Valves and guides and valve seals are freshly redone due to burnt exhaust valve on #1 8) RC 750cc injectors replaced because thought might have caused lean condition burning #1 valve 9) The cylinder bores ant the tops of the Pistons all looked fine when I had the head off to have the valve fixed. 9) Doesn't seem to be down on power 338.2 hp 295 ft.lb at 17psi on the Dyno Dynamics dyno Yesterday afrs safely in the 11.8 to 11.4 range. Grayish smoke cloud out the tailpipe on the dyno but not really a total smoke out. Some of the Hondas were worse. Any Ideas? I never noticed the smoke before until just before I burned the exhaust valve. Now the smoke cloud is really unsightly and I'm worried I'm going to do more expensive damage running it further. Bob ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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