<VV> Using compression gauge to locate TDC ?

[Charles Lee]

On closer examination, I get 0 on the alternating TDCs, so that must be
the exhaust.

I do get 60, then 120, so maybe it's 60 on the 1st compression TDC, then
120 on the 2nd time compression TDC ?
Seems like good compression though.

I'm using a remote start since the "manual crank" method does not
register any compression with the gauge, and I feel nothing with the
"finger in the plug" method either.

So, I waited for a reading then backed it up to TDC and considered that
TDC to be "compression."

After all that testing, I killed the battery, but it seemed to have
tried to start before the battery went completely out.

Try again later.

Conclusion, the "compression gauge method" seems to identify the stroke
nicely, and you can borrow one from your local AutoZone for free (just
leave some ID.)

Thanks (to be continued)
Charlie



-----Original Message-----
From: Ron [mailto:ronh at owt.com] 
Sent: Wednesday, September 24, 2008 3:43 PM
To: Charles Lee
Subject: Re: <VV> Using compression gauge to locate TDC ?


I've never tried that but it seems to me that there should be no
measurable 
pressure on the exhaust stroke.
RonH

----- Original Message ----- 
From: "Charles Lee" <chaz at ProperProPer.com>
To: <virtualvairs at corvair.org>
Sent: Wednesday, September 24, 2008 3:29 PM
Subject: <VV> Using compression gauge to locate TDC ?


>I just tried (again) to locate the correct TDC, and I used my  
>compression gauge (actually borrowed from AutoZone, no charge) to 
>locate  TDC.
>
> I noticed that compression spikes each time the rotor passes #1, 
> hitting about 50-60 lbs one time, and then 110-120 lbs the next time, 
> alternating between the readings.  (I removed the valve so it does not

> hold the reading, as I watch the gauge)
>
> I'm assuming that the low reading is the exhaust stroke, and the high 
> reading is compression ?
>
> This is a method I had not heard before, and I'm wondering if it's 
> valid ?
>
> Seems logical, but I wanted to run it past you guys.
>
> The engine does not start in either position, so there IS some other 
> problem, but I want to make sure I have the correct TDC before I start

> poking around.
>
> Thanks again,
> Charlie
> 1967 Monza 110 PG coupe
>
>
>
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