<VV> valve seats revisited (Engine Braking)

[jvhroberts at aol.com]

 Again, a sample of 1 isn't meaningful. IMHO, the CHT on all Corvair engines is too high. Run one hard, and it's ALWAYS too high. 

 

John Roberts
 

 

-----Original Message-----
From: Ron <ronh at owt.com>
To: virtualvairs <virtualvairs at corvair.org>; JVHRoberts <JVHRoberts at aol.com>
Sent: Wed, May 9, 2012 10:38 am
Subject: Re: <VV> valve seats revisited  (Engine Braking)


ALL Corvair engines?  The 110 in my '66 has never been removed and all
original valve seats are intact.  It has been driven over the Cascades
numerous times (like last weekend when I took it over both Stevens and
Snoqualmie Passes) with no problems.  It has been cruised in 115 degree 
temperatures, not just to the store but on the Interstate all day.  Yes, we 
have mountains here and no valve seat problens, or at least not for the last 
46 years.  I don't know about next year, of course.
RonH

----- Original Message ----- 
From: <jvhroberts at aol.com>
To: <virtualvairs at corvair.org>
Sent: Tuesday, May 08, 2012 11:20 AM
Subject: Re: <VV> valve seats revisited (Engine Braking)


>
> Not quite. It means ALL Corvair engines need both better cooling and
> better valve seat retention. A CHT won't tell you when the seats are about
> to come loose. That's an inevitability on a lot of these engines.
>
>
>
> John Roberts
>
>
>
>
> -----Original Message-----
> From: FrankCB <FrankCB at aol.com>
> To: vairmike <vairmike at sbcglobal.net>; virtualvairs
> <virtualvairs at corvair.org>; judynrandy <judynrandy at comcast.net>
> Sent: Tue, May 8, 2012 1:23 pm
> Subject: Re: <VV> valve seats revisited  (Engine Braking)
>
>
> That's why IMHO not just turbos and 140s but ALL Corvairs need at least
> ONE head temp gauge.
>
> Frank Burkhard
> Boonton, NJ
>
>
> In a message dated 5/8/2012 11:23:43 A.M. Eastern Daylight Time,
> vairmike at sbcglobal.net writes:
>
> My  experience with dropping valves has mostly been when going from steady
> hwy
> cruising (no indication of overheat) to closed throttle exit ramp. I could
> see
> hill climbing to engine braking could easily be worse. I think most of  my
> cases
> of dropped valve seats were caused by a previous (months or  years)
> overheating
> from broken/thrown belts.
>
> Mike  Kost
>
>
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