PG Turbos?? Re: <VV> Re: TURBO BENT VANES

[Ron]

A local mechanic, now retired, told how his ex took his beloved Spyder out 
and ran it full throttle in a lower gear until blew both heads loose.  It 
does happen, with the wrong wifie.  She became ex shortly after.
RonH

----- Original Message ----- 
From: "Tony Underwood" <tonyu at roava.net>
To: <virtualvairs at corvair.org>; <turbovair at yahoogroups.com>
Sent: Tuesday, September 11, 2007 3:15 PM
Subject: Re: PG Turbos?? Re: <VV> Re: TURBO BENT VANES


> At 09:43 AM 9/11/2007, Mark Corbin wrote:
>>A GM engineer who worked on the Corvair and addressed the CORSA convention
>>one year responded as to why it was never offered. He said that they found
>>that with just two speeds in the Corvair's powerglide, the situation arose
>>that when the trans shifted, you were running high boost and suddenly also
>>had low RPM. What happens then is that you tend to blow the heads off the
>>engine. With a three-speed, they might have gotten away with it, though.
>
>
> I suspect the fellow was speaking whimsically.   I've seen tweaked 'Vair 
> engines that were overboosted and thus break, and the heads never failed. 
> Pistons would perforate or collapse and/or break apart, connecting rods 
> would bend, or bearings would mash out causing the rods to beat up the 
> crank journals and heat up the big end and possibly toss a rod, but I've 
> not seen heads blow off, ever.
>
> Too many other parts will fail first before the heads manage to pull the 
> studs out.    Of course, I've not seen everything either.   But I'd put 
> money on piston failure first, then rods, before I'd wager the heads would 
> blow off.
>
>
> By the way, IMHO it takes a special kind of lead foot to load enough boost 
> to bend connecting rods.   ;)    ...and I still have some pistons with the 
> top ring grooves so tight against the compression rings that they won't 
> come out or even move at all... piston crowns slightly dished... and they 
> weren't dished pistons when they went into the engine AND the dishing 
> wasn't from being squashed, it was from heat erosion.
>
> ...crowns looked like asphalt.    Good place for ceramic coating, I bet, 
> and an educational experience in how not to load up a turbocharged 'Vair 
> engine beyond reason.   Junk happens.
>
>
>
> tony..
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