What does this leak sound like (video) Options

[VaccaRabite]

Okay, a while back I had the #2 exhaust rocker back off while breaking in the engine.

I fixed that, and rebuilt the carbs.

Tonight I reset the valve gap and, ran it for the first time. It runs, but I heard a noise I did not like. There is a leak somewhere on the 1/2 head bank. Watch this video I made. it is me cranking the engine on my test stand. No fuel or spark, only cranking. The spark plugs are in to force compression.

You can hear a "fffffffft, fffffffft, ffffffffft" sound, that I don't think is supposed to be there.
Link to the video on Flickr


Zach

[VaccaRabite]

Yeah. I fired it. It runs on all 4. Each carb is drawing the same amount of air. I have the idle set at 2K in order to seat the rings, but it was idling fine at about 650 rpm before I opened up the idle adjustment screws.

There could be an exhaust gasket leak between the stub pipe and the header pipe. I have had to take the 1/2 head pipes off a few times, and the gaskets have seen better days. But I did not see fit to source new gaskets until I was done taking the pipes off. I have to remove those pipes in order to use the Tangerine lifting plate.

I'll take a vid of the engine running this afternoon after I am done baby duty, and have the corn and beans planted.

Zach