[Gmecm] Roller Noise. Was: Re: [Fordnatics] pushrod guide plates - louder than rail types?

[Mike Frels]

Not trying to hijack this thread but It leads into something I have been wondering since last year.

In my chevy 350 I am running Comp Cams Magnum roller tip rockers. Not the Pro Magnum roller on the pivot also type. With the 1/2 turn in preset on them that Comp recommends my engine definitely has the "sewing machine" sound to it when reving. I have always wondered how much of that additional noise might be picked up by the Knock Sensor. I am running a '730 and even on mild acceleration I get some knock counts. Any experience out there?

Mike

-----Original Message-----
From: Dave Williams <ronin at aristotle.net>
Sent: Aug 9, 2005 5:49 AM
To: For discussion of GM EFI hardware and software <gmecm at diy-efi.org>
Subject: [Gmecm] Re: [Fordnatics] pushrod guide plates - louder than rail	types?

shane san miguel wrote:

> Anybody ever notice more valve train noise from guide plate equipped
> engines?  I recently tuned up a motor I built a while back and it had a

  I never noticed anything from guide plates, but you can usually hear a 
bit more noise from roller rockers.  I'm not sure why, though.  It's not 
just me; GM put Crane roller rockers on the LT4 engines, and issued a 
service bulletin for dealers to tell customers that the noise was normal.

-- 
===ronin at aristotle.net (Dave Williams)===================DoD #978===
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