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#875513 - 04/11/07 05:09 PM Re: Chevy Piston Slap [Re: SargeGTO]
flatlandtacoma Offline


Registered: 07/08/06
Posts: 1022
Loc: Illinois
The FCC is approving engines for aircraft now? They've really branched out. That used to fall under the FAA jurisdiction.
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#875514 - 04/11/07 06:24 PM Re: Chevy Piston Slap [Re: bretfraz]
kevm14 Offline


Registered: 07/20/04
Posts: 342
Loc: North Kingstown, RI
Quote:

The best performing oil for me was GC.

Worst oils were Mobil products. My engine sounded like an old diesel with M1 and DC7500 in it. No more Mobil products for me.




This has been my exact experience as well. GC made my 245k Caprice 350, 166k Camaro LT1 and 80k 2000 Malibu 3100 V6 all sound their best, and they sounded their worst on M1, with 0W-40 maybe being the worst of the M1s, which really struck a negative chord with me, since the 0W-40 looks attractive on paper.

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#875515 - 04/11/07 06:26 PM Re: Chevy Piston Slap [Re: flatlandtacoma]
SargeGTO Offline


Registered: 12/24/06
Posts: 802
Loc: Rio Grande Valley
Quote:

The FCC is approving engines for aircraft now? They've really branched out. That used to fall under the FAA jurisdiction.


LOL
Yup...old here....it comes and goes. Make that FAA

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#875516 - 04/12/07 03:54 AM Re: Chevy Piston Slap [Re: SargeGTO]
SargeGTO Offline


Registered: 12/24/06
Posts: 802
Loc: Rio Grande Valley

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#875517 - 04/12/07 10:24 PM Re: Chevy Piston Slap [Re: SargeGTO]
Texas Aggie Offline


Registered: 12/04/04
Posts: 182
Loc: Longview, TX
Is this still an issue? I heard a lot about it a few years ago, now I hardly hear anything about it. I have an '04 Chevy P/U with a 5.3L, but it's never had the slap. I've been concerned that it will happen, but fortunately nothing yet. I was under the impression that if it wasn't fixed by this MY, then it was fixed soon after. I'm now using GC, though, and it seems to work great in this engine.

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#875518 - 04/12/07 11:09 PM Re: Chevy Piston Slap [Re: Texas Aggie]
drfeelgood Offline


Registered: 12/21/05
Posts: 80
Loc: Georgia
My 2003 5.3 Flex fuel Tahoe is a bit noisy like most of the GM V8s but I think its either lifters or the fuel injectors.Regardless, its been smoothest/quietest with GC and no appreciable mileage/power loss.
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#875519 - 04/13/07 09:22 AM Re: Chevy Piston Slap [Re: drfeelgood]
N4cer Offline


Registered: 12/12/06
Posts: 30
Loc: Kentucky
Noisy fuel injectors? How does that work?

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#875520 - 04/13/07 05:19 PM Re: Chevy Piston Slap [Re: N4cer]
drfeelgood Offline


Registered: 12/21/05
Posts: 80
Loc: Georgia
I wish I could tell you the specifics. There are posts about the tapping and clicking noises the GM motors make regularly on corvetteforum. Very common, evidently. My 2005 vette has it, as does my Tahoe and as did my 2001 Yukon. Doesn't sound like piston slap, more a rhythmic ticking, and happens whether hot or cold. I don't think it's all "injector noise" as using GC (and PP once) decreased the noise as compared to M1.
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1970 Chevelle SS396
2010 Commander Hemi
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2010 Cube

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#875521 - 04/13/07 06:05 PM Re: Chevy Piston Slap [Re: drfeelgood]
wgtoys Offline


Registered: 12/11/06
Posts: 1240
Loc: California
The idea that the FAA has certified the LS1 motor for aircraft use appears to be urban legend. The closest thing I can find is a company in Canada which has done some conversions of 1940s Seabees to LS1/2 power. Here is what they say about US certification: "In the U.S. the only viable licensing option we have been able to identify is compliance with the amateur built rules. In theory the aircraft could be licensed by using a one time STC or via the 337 process. We have been unable to find an inspector willing to do this." http://www.v8seabee.com/reg.asp

To the best of my knowledge, no modern automotive engine has earned FAA (or FCC!) certification for aircraft use. Maybe someone somewhere has gotten an inspector to sign off on an aircraft under special amateur built rules, but that is hardly the same thing as a full FAA certification.

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