[DeTomaso] pneumatic kit to find TDC

[Will Kooiman]

The intake valve normally closes several degrees after BDC.  My current cam
closes 73 degrees after BDC.

 

Those are crank degrees, which move twice for every cam degree, but still,
73 degrees is almost ¼ of a turn.

 

It doesn’t really matter, though.  What I meant is when you finger is pushed
off, it is on the compression stroke, so the next TDC is the one you want.
Or, if you’re watching the rockers, when the intake starts to close, the
next TDC is the TDC when the plug is supposed to fire.

 

  _____  

From: Rob Dumoulin [mailto:rob at dumoulins.net] 
Sent: Saturday, November 27, 2010 6:46 PM
To: Will Kooiman
Cc: Larry Finch; detomaso at realbig.com
Subject: Re: [DeTomaso] pneumatic kit to find TDC

 

Actually, Intake valve closing is not TDC on the compression stroke.  That
would be BDC.  TDC after the fire stroke is when the exhaust valve closes.
Getting exact TDC probably cannot be done looking at the valve because of
intentional overlap to optimize flow.  At least that is what I remember from
years ago, though I may be wrong on the Cleveland.

On Sat, Nov 27, 2010 at 6:53 PM, Will Kooiman <wkooiman at earthlink.net>
wrote:

It looks like a whole lot of gadget for a simple enough task.

You can remove a valve cover and watch the valves.  The compression stroke
is TDC right after the intake valve closes.

If you don't want to remove a valve cover, remove the #1 plug, and cover the
hole with your finger.  Don't stick your finger all the way in the spark
plug hole.  Just cover the hole.  When the piston comes up on the compress
stroke, it will blow your finger off.

You can use a screw driver to find TDC.  The screw driver will stop getting
pushed out the hole as the piston comes up.

I have also used a spark-plug-TDC-locator.  It is essentially a piston stop
that screws into a spark plug hole.  You turn it over by hand until it
stops, mark the balancer, turn it over in the opposite direction, mark the
balancer, halfway between the 2 marks is TDC.


-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Rob Dumoulin
Sent: Saturday, November 27, 2010 7:03 AM
To: Larry Finch
Cc: detomaso at realbig.com
Subject: Re: [DeTomaso] pneumatic kit to find TDC

Sometimes the simplest solutions are the best.  This one also would only
show you TDC on the compression stroke, which is when you want to line up
the distributor too.


On Sat, Nov 27, 2010 at 1:12 AM, Larry Finch <fresnofinches at aol.com> wrote:

>
>
>
>  right here...
>
> http://www.jhmbuttco.com/acatalog/info_AST5005.html
>
> Larry
>
>
>
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Rob DuMoulin
904.476.8744
rob at dumoulins.net
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