<VV> piston rings

[Mark Durham]

Spence, I need a few details. What type of oil are you using or a
better question, what weight and type were used when you did your
initial start and run at 2000 rpm?. How many miles are on the engine?
Was the overhaul completed due to smoking?

You say the guides were good. Does this mean they were within new
limits and guide to valve clearance is also in new limits?

Did you use the cylinders with the correct crosshatch pattern for total
seal rings?

Have you taken all plugs out to see if there is even color on all, or
if there is a cylinder or two using more oil?

Let's see where this goes, but I would not rule out the rings. The fact
that you have good compression does not mean oil is being used and
going past the rings because these rings do take a long time to fully
seat and oil will help compression.

For instance, my engine with chrome rings puffed on startup for over
1200 miles then just stopped one day, and still is using a little oil
at the 2000 mile mark. but compression was good after initial break in.
Mark Durham



Sent from my Windows Phone
From: Eric Lucas
Sent: 1/30/2013 10:19
To: VV List
Subject: Re: <VV> piston rings

Spence,

I suspect valve guides. I have seen this before with the worse
condition at idle. Higher rpms tend to mask it as the inertia of the
valve at higher speed helps mitigate the sealing. Also, you have good
compression which further makes me want to look elsewhere. I don't
think the style of valve seal is your problem. You could check the
plugs and see which ones were fouled and might point you to one
particular valve. If it was rings, you might rather expect fouling on
all cylinders.

Hope that helps.


> From: sshepard3 at hotmail.com
> To: virtualvairs at corvair.org
> Date: Wed, 30 Jan 2013 17:09:16 +0000
> Subject: <VV> piston rings
>
>The problem is the engine smokes. It's especially bad when the engine is hot and really bad if you let in idle for a while when it is hot. Compression is very good on all cylinders and there are no vacuum leaks. The smoke is the same with the vacuum modulator blocked off. It idles very well when cold, has good power and runs  		 	   		
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