<VV> RE: installing a cam?

[Andy Clark]

Hi, Bob. I do the same- 5-10lb torque increment, then turn.

While you have undoubtedly done many more engines than I have, I can only
report to you that it happened to me (once), and I have been sensitized to
the possibility of a repeat occurrence in the several engines I have built
since. As I mentioned, I expect some significant revs out of my race
engines, and even my street versions, so any anomaly upon assembly is cause
for concern. It's not like the "tight spot" was "tight", in the normal sense
of the word, it's that upon crank rotation I could detect a slightly
increased resistance to rotation in one spot. The book that was the "bible"
in those days even cautioned about it, so, not knowing better, I made a
mental note. Then when it happened to me a year or two later, it was one of
those "AHAH!" moments that has stuck with me ever since. I have not had a
repeat occurrence, however. Maybe that means something. I dunno.

The assembled experts herein seem to think that it's not a big deal. OK, but
I personally still keep an eye open for it on any engine I assemble. I
mentioned it only so that anyone who was interested could file the info away
for use in the future.

Regards
Andy Clark
Camano Island, WA.
1966 140/4 Monza Sedan
1966 140/4 Yenko Clone
1966 180/4 Cord 8/10 #60
----- Original Message ----- 
From: <BobHelt at aol.com>
To: <slowboat at mindspring.com>; <virtualvairs at corvair.org>
Sent: Saturday, April 14, 2007 10:01 AM
Subject: Re: <VV> RE: installing a cam?


>
> In a message dated 4/13/2007 2:09:33 PM US Mountain Standard Time,
> slowboat at mindspring.com writes:
>
> Personally I have, in the past, had a block exhibit the
> dreaded  tight spot using the factory torque sequence
>
>
> Andy,
>  I personally have NEVER experience a "dreaded tight spot" as you
describe
> it in any of my engine rebuilds using the shop manual sequence. And all
my
> clearences have been set rather tight (0.0015"). Of couse I tighten the
case
> bolts in 5-10 ft-lb increments, turning the crank after each. But still, I
have
> never had to go back and start over or found a "high spot". IMO there is
> something seriously wrong if a high spot is encountered. You've got
something
> out-of-round, or some other problem if this happens in my opinion. Maybe a
> warped case?  Do you think that the factory got high spots?
>
> Regards,
> Bob Helt