Rattle from back of motor????

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06-18-2016 | 08:29 PM

#11

getrdunn

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Joined: Feb 2009

Posts: 8,356

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From: NW Michigan

What ind of power are you throwing at that poor thing? Lol

06-18-2016 | 08:38 PM

#12

230lx434

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Joined: Jan 2016

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Getrdunn it made 618hp/541tq. SBC. Would your previous post fix the ratlle or just the trim indicator?

06-21-2016 | 12:56 PM

#13

86Capri

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Joined: Nov 2011

Posts: 197

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From: Gardner, KS

Are your external flappers new? When I put mine on for the first few runs. At idle they sounded horrible I thought my motor was knocking.
Plus real easy to eliminate they come off easy. no harm in trying.

mine
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06-21-2016 | 01:33 PM

#14

Dave M

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Joined: Oct 2000

Posts: 5,664

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From: Hollywood, MD, USA

Quote:

Originally Posted by 230lx434

Motor idles around 980-1050. Also i was told by a local performance marine guy that 1000rpm shifting would be ok?

May not have anything to do with your issue, but that DON'T sound good to me.

06-21-2016 | 01:34 PM

#15

Baja Rooster

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Joined: Oct 2013

Posts: 2,888

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From: SF Bay Area

I put Hardin tips on and even the the flaps are rubber I thought the engine was coming apart. Since the sound goes away with rpms maybe a lifter issue? You can try changing different weight oil and see if it has any effect at all.