<VV> Opinions on compression

[Roger Gault]

Guus,
Do you have a spare ignition coil.  They tend to fail as they get hotter,
and the turbo is more sensitive to spark quality.

I wouldn't let the absolute temp bother me, especially if it's the factory
gauge.  Do you have some history of temperature that would indicate that
this is higher than usual?

Roger

----- Original Message ----- 
From: "Guus de Haan" <corvair at corvair.nl>
To: "Virtual Vairs" <virtualvairs at corvair.org>
Sent: Tuesday, June 20, 2006 1:39 PM
Subject: <VV> Opinions on compression


> Last Sunday we wanted to take the Corsa to a classic car event. With
> the fuel problem solved I was kind of hoping on some driving fun. We
> took the highway because that is the quickest route. Even at 60 MPH
> it is running over 400F. I decided to take the secondary roads back
> home but it began to run worse and worse. I was convinced it was
> running on 4 cylinders or less. Spitting and popping and running very
> rough. In the evening I installed a pair of other (used) spark plugs
> but it ran just as bad. The old spark plugs look pretty good, even
> grey color, not carbonned up or or anything like that.
>
> This engine had a turbo rebuilt because a chip of the impeller was
> missing and it was carboned up. I never found the piece and was kind
> of expecting it to be inside a cylinder somewhere ruining some
> valves.  I was planning to remove the heads coming Saturday but
> decided to do a compression test first. I expected to measure low
> compression on one or more cylinders. The engine has not been driven
> much since its rebuild but I was surprised the values weren't to bad
> at all.
>
> 1 - 12
> 2 - 9,5
> 3 - 11
> 4 - 10+
> 5 - 11+
> 6 - 10+
>
> What's your opinion on these figures?
> Cylinder 2 is lower but I would not expect the engine to run that bad
> because of this.
>
> The Air/Fuel ratio according to the SafeGuard is pretty good when
> driving.
>
> My guesses:
> The valves are set to tight and stay open when the engine really
> heats up.
> The distributor (one of the few pieces not rebuilt) is failing somehow.
>
> Sorry for the long post but I really appreciate any advice (and of
> course moral support ;-)
>
> Guus
> The Netherlands
> '65 Corsa Turbo-Charged Cvt
>
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