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 New Engine Rattle- Sign of Tappet Failure?

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LBC Tenni
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PostSubject: New Engine Rattle- Sign of Tappet Failure?   Sun Jan 18, 2015 12:35 am

Rode without earplugs today and while blowing the socks off a stoplight revving joker on a Harley I noticed an engine rattle I haven't heard before. It happens at high revs when I abruptly open the throttle. It lasts for about one second and then it's gone. It's a very harsh rattle-can noise. I got it to do it a few more times in different gears, but it's hard to tell if it's coming from one side or both.
It may be that I just haven't heard it before because I usually wear earplugs. The rest of the time the engine sounds great.

Wondering if this is the first sign of trouble from my flat tappets?  pale

What other warning signs should I be listening for?  I would imagine more rattles that don't go away or get worse?
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ghezzi
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PostSubject: Re: New Engine Rattle- Sign of Tappet Failure?   Sun Jan 18, 2015 12:44 am

Could be pinging/detonation etc.
Is your bike 'Beetle' mapped?
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LBC Tenni
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PostSubject: Re: New Engine Rattle- Sign of Tappet Failure?   Sun Jan 18, 2015 12:50 am

Yes, freshly mapped with Beetle's factory can map and she's running beautifully in all other respects.
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beetle
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PostSubject: Re: New Engine Rattle- Sign of Tappet Failure?   Sun Jan 18, 2015 1:46 am

Sounds like it might be pinging. How's your TB balance? Poor balance can cause pinging.
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LBC Tenni
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PostSubject: Re: New Engine Rattle- Sign of Tappet Failure?   Sun Jan 18, 2015 9:44 am

Thanks guys! I'll check the TB balance ASAP.
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Grisonut
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PostSubject: Re: New Engine Rattle- Sign of Tappet Failure?   Sun Jan 18, 2015 12:37 pm

Sure it wasn't the Harley?? Razz
Wait!! High revs you say? I guess it ain't the hog then.
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Pete Roper
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PostSubject: Re: New Engine Rattle- Sign of Tappet Failure?   Sun Jan 18, 2015 5:17 pm

Also, when you did the map upload, did you reset the TPS and self learning parameters? If not, do so.

Sounds like detonation to me. Usually this is worst at low rpm, wide throttle but it can occur at any time if the mixture is too lean or the spark is too advanced for the fuel's octane rating.

Pete
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