<VV> Turbo Motor Cycling

[Jim Becker]

How about a sticky mechanical advance or a worn point plate?  Assuming you 
have a pressure retard distributor, a vacuum advance shouldn't be causing 
it.

Jim Becker

-----Original Message----- 
From: Brian via VirtualVairs
Sent: Wednesday, October 30, 2019 10:11 AM
To: VirtualVairs at corvair.org
Subject:  Turbo Motor Cycling

I am finishing up a project for a fellow club member to get his 1965 Turbo 
convertible back on the road.  He dropped the valve seat which cause 
significant damage so a total engine rebuild was necessary.  Using all stock 
parts I rebuilt the engine.  I then ran it on the run stand that we have 
here in our club.  I ran it with two carburetors while both the Turbo and 
the carburetor were out for professional rebuilding.

While on the engine stand it ran flawlessly.  Now that is installed in the 
car and the Turbo with his carburetor is installed there is a cycling 
problem.  The engine fires instantly and with the choke disconnected idles 
but the idle fluctuates from about 690 RPM to about 920 RPM.  The cycling is 
slow in other words it will run for a couple of seconds may be as much as 30 
seconds and then the idle will jump either up or down.

As mentioned all the parts are stock to include the camshaft.  Timing is set 
at 24° as per the shop manual.  Not being a Turbo guru I am stumped.  Is it 
possible that this cycling is caused by an improper setting of the idle 
mixture or is there some other issue?  Any help would be much appreciated. 
Thanks in advance.
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