<VV> Noisy OT Cams (was cam poll)

[Ray Rodriguez III]

Kevin,

     I'm dealing strictly in second hand information but I'd almost 
guarantee that the Otto TB cam is the cause.  The reason I say this with a 
fair amount of confidence is that on the two or three occassions I've 
personally had a conversation with someone complaining about a noisy Otto 
cam it has always been an Otto TB cam that was the subject of their 
complaints.

     I'm not saying there is no such thing as a quiet Otto TB cam, just that 
they have definitely been a problem for some folks.  The last gent I 
remember clearly, I met him at the DACC homecoming last year (may have been 
canadian).  He had a beautiful (yellow I think) turbo late model coupe with 
stripes if I recall that he spared no expense on.  The car was not present 
at the show but he said every time he pulled into a cruise night everyone 
would comment on the valvetrain noise and cite it as confirmation that 
"Corvairs are junk" (That's just how he said it to me), and that it really 
upset him given the time and money he had invested.  I believe Bryan was 
also involved in the conversation but I could be mistaken.  Can't recall 
which grind but I'm near 100% certain it was an Otto TB series.

Ray "Grymm" Rodriguez III
Lake Ariel, PA
66' Corsa 140 coupe
63' Monza PG (winter driver)
65' Corsa 140 coupe  (under construction)


----- Original Message ----- 
From: "kevin nash" <wrokit at hotmail.com>
To: <virtualvairs at corvair.org>
Sent: Wednesday, March 09, 2011 10:29 PM
Subject: Re: <VV> Cam experience poll



> Ray- you are causing me to think that my noisy engine is caused by the 
> cam! I have a OTTO tb-10
> cam, (with the recommended valve springs, Ti valve spring retainers, heavy 
> duty pushrods) and it
> has been noisier than I'm used to hearing ever since I got it going (with 
> this cam) in 2008. Originally,
> I had the Source lifters in, but noticed that the engine was noisy, tried 
> sealed power lifters (no real
> difference in noise level), scored a set of NOS corvair lifters, put those 
> in (slightly quieter, not enough to matter),
> replaced all rocker arms and balls with the new clarks repro rocker arms, 
> and again no difference in noise.
> I gotta put a plug in for the new rocker arms- these really are very, very 
> nice, very accurate repro of the
> stock rocker arms, fit wise, but are a bit beefier, as the wall thickness 
> on the new rockers has been increased
> somewhat. I also replaced the rocker arm studs with new heavy duty ones, 
> as some of the stock ones that
> were in previously had an unacceptable amount of run-out. The rocker arm 
> studs didnt help the noise level,
> nor did any of the various valve adjustments that I did, nor the 2 
> different pushrod lengths that I tried (+.06
> and std.). The standard length ones are in now, and are the correct ones, 
> as the wear pattern on the rocker
> arm and the valve tip is dead center on both. My oil pressure is 25-30psi 
> when warm at idle, and is 50 psi when
> cold. I've experimented alot with various oil viscosities, going as high 
> as 20w-50 (DONT DO IT!!!! very noisey) and down
> to 0w-40, which seems to work the best.
> Kevin Nash