<VV> Why #5 Throws Seats

[J R Read_HML]

Hey Joe,

Does not match my experience at all.  Seems to me that #3 and #4 are most
prone to valve seat failure.  I suspect that it is hotter in the middle than
on the outside.  I guess we would need some kind of empirical data to prove
who might be right on this one.  Personally, I have neither the time nor
inclination.  But, if someone wants to volunteer.....?

Attachments are scanned with anti-virus software.

Later, JR
----- Original Message ----- 
From: "N. Joseph Potts" <pottsf@msn.com>
To: <OPENHABIT@aol.com>; <virtualvairs@corvair.org>
Sent: Saturday, July 10, 2004 9:54 PM
Subject: RE: <VV> Why #5 Throws Valve Seats, was Fresh Air Vent


> I'd like to offer an alternative theory as to why cylinder #5 so
frequently
> throws the big (on 140s) valve seat.
>      The theory relies on the observation that it is about equally common
> for #2 to throw a valve seat.
>      The cylinders on the Corvair are staggered from one bank to the
other.
> #5 and #2 are the "extreme" cylinders, in that they are farthest from the
> blower. Go look at yours, and you'll see what I mean. I believe these two
> cylinders are thermally stressed more than the other cylinders because of
> this. Or, more specifically, I mean those ends of the heads. The opposite
> end of each head is substantially closer to the blower, and valve seats
> throw less frequently on the less-extreme cylinders #1 and #6.
>      Partly because I never need heat in the passenger compartment here in
> South Florida, I keep my fresh-air output blocked and an intact hose
> attached to it and to the heater box.
>      What's your name, OpenHabit?
>
> Joe Potts
> Miami, Florida USA
> 1966 Corsa coupe 140hp 4-speed with A/C
>
> -----Original Message-----
> From: virtualvairs-admin@corvair.org
> [mailto:virtualvairs-admin@corvair.org]On Behalf Of OPENHABIT@aol.com
> Sent: Saturday, July 10, 2004 8:38 PM
> To: virtualvairs@corvair.org
> Subject: <VV> Fresh Air Vent
>
>
> > SNIP: People block the air outlet because they are too lazy to replace
the
> air hose to >the heat control box.
>
> All right, this has become serious.
> The hole at the back of the "Turkey Roaster" is referred to as a "Fresh
Air
> Vent." Experience has shown that it can rob cooling air from the number
five
> cylinder. I have known a few people that have lost a valve seat from
number
> because of this. I don't want this to happen to my car, so I block it to
> keep the
> cooling air flowing over that colander. I usually run a nice new hose
> connected up, so the stock people won't have a cow. It has nothing to do
> with my being
> lazy. I am lazy enough without that aspect.
>
> Openhabit
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