<VV> Cylinder balance test interpretation

[Daniel Monasterio]

Interesting !

 

On simplest logic it looks like # 4 is working better than all others. Too early for me (just waking up) to think deeper but, would like to know what is happenning on that engine.

 

Daniel
 
> Date: Sun, 24 May 2009 02:07:06 +0000
> From: dougmackintosh at yahoo.com
> To: virtualvairs at corvair.org
> Subject: <VV> Cylinder balance test interpretation
> 
> On the Corvair I am working on, I believe I have a collapsed hydraulic lifter on # 4 Exhaust. I believe the valve is being lifted some, since it is not blowing back through the intake as it does if I completely disable that valve. 
>  
> Today I tried a cylinder balance test (at idle) by shorting each cylinder out and observing the RPM drop. I was expecting to either see approximately equal RPM drop for all cylinders, or no RPM drop on cylinder 4. Instead, I found that 5 of the cylinders had similar RPM drops (approximately 80 RPM) but # 4 cylinder dropped around 240 RPM.
>  
> Why did it do that?
> 
> -- Doug Mackintosh
> Corsa member since 1996
> Corsa/NC member since 1996, Virtual Vairs member
> Corvair owner 1969-1971 and 1996-on
> 
> 
> 
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