No, air pressure. Basically you put air in each cylinder and listen at the ports. If you hear air escaping past the ports it's time for a valve job or new valves.
In the case of exhaust valves, just listening at the tail pipe is usually enough to indicate if the valvetrain is in need of repair.
-----Original Message-----
From: mechmark@xxxxxxxxxxx
Sent: Nov 3, 2008 3:52 PM
To: tcb@xxxxxxxxxxxxx
Subject: [tcb] Re: Hey Brian...
Isn't a leak down test where you fill the engine to the top of the carb with oil and see if any leaks out???
-------------- Original message --------------
From: Will Wood <evilscientistboo@xxxxxxxxxxxxx>
burnt valve/worn seat area can cause combustion to escape into the exhaust port. If it's running rich you could have flame travel as well at the
exhaust port causing a pop.
A leakdown test is easy enough to do.
-----Original Message-----
From: wuzmop@xxxxxxx
Sent: Nov 3, 2008 1:25 PM
To: tcb@xxxxxxxxxxxxx
Subject: [tcb] Re: Hey Brian...
I'm pretty sure it's not too lean. Wouldn't a burnt valve affect preformance? It preforms perfectly.
-----Original Message-----
From: Will Wood <evilscientistboo@xxxxxxxxxxxxx>
To: tcb@xxxxxxxxxxxxx
Sent: Mon, 3 Nov 2008 11:38 am
Subject: [tcb] Re: Hey Brian...
now that makes less sense.
-----Original Message-----
From: Brian Denning
Sent: Nov 3, 2008 12:30 PM
To: tcb@xxxxxxxxxxxxx
Subject: [tcb] Re: Hey Brian...
butt, will, it sounds like your butt
i meant yours as in robbs
Date: Mon, 3 Nov 2008 12:26:36 -0500 From: evilscientistboo@xxxxxxxxxxxxxTo: tcb@xxxxxxxxxxxxxSubject: [tcb] Re: Hey Brian...
sounds like my what?
-----Original Message-----
From: Brian Denning
Sent: Nov 3, 2008 12:16 PM
To: tcb@xxxxxxxxxxxxx
Subject: [tcb] Re: Hey Brian...
if you saw the black smoke on robbs bumper you'd know it isn't running to lean.
did you listen to the youtube video of mine? sounds just like yours.
who knows, it might be a bad connection at the coil :D
Date: Mon, 3 Nov 2008 12:09:38 -0500 From: evilscientistboo@xxxxxxxxxxxxxTo: tcb@xxxxxxxxxxxxxSubject: [tcb] Re: Hey Brian... There's a difference between pop and poop. 1) Too lean a mixture. 2) Burnt Exhaust Valve. Are the number one / two that come to mind.
-----Original Message-----
From: wuzmop@xxxxxxx
Sent: Nov 3, 2008 10:53 AM
To: tcb@xxxxxxxxxxxxx
Subject: [tcb] Hey Brian...
I found a thread of yours on the samba about exhaust popping. What's the verdict? My bus is doing the same crap intermittently.
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