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

[Ne14RoxCJ]

I have been running those Magnum roller tip rockers on my K5 Blazer for a
few years now and haven't noticed any ill effects on the knock sensor. I've
run them on a TBI 350 with a too-big Comp 4x4 Extreme cam and slightly
ported GM EFI heads with guide plates for a couple of years. Now they are
installed on a TPI 350 with a great little Comp 4X4 Extreme cam, Dart Iron
Eagle (small runner) heads without guide plates, and a 7730. I rarely see
any knock counts now and only at WOT with it wound up tight. I'm not sure if
the adjustment would help any, but I'm guessing not. I adjusted mine to all
different settings (3/4 turn, 1/2 turn, 3/8 turn, etc.) chasing a real
problem on the TBI engine. Nothing seemed to make any difference. I think I
would look at the base timing or the tables to see if it needs a little less
timing in some areas. Good luck.

Beau

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Mike Frels
Sent: Tuesday, August 09, 2005 6:43 AM
To: gmecm at diy-efi.org
Subject: [Gmecm] Roller Noise. Was: Re: [Fordnatics] pushrod guide plates -
louder than rail types?

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===
== "Peace Through Superior Firepower"  USAF Strategic Air Command ==
========================== http://www.bacomatic.org/~dw/index.htm ==

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