Where is everyone #5

Well its definatly not accessory drive related. No change with belts off.

 

It sure doesn’t sound like gear noise to me. But don’t take that to the bank.

run it with the valve cover off see if it’s worse

 

Is it just me or does it sound like an air compressor with the discharge line off?

Does it stop when the air is built all the way up?

 

Around here we call the 589 a Peterliner.

 

10-4 thats where i was going next . will have to do it tomorrow. The wind here today is doing its best wyoming impression.
Seems to be back near exhaust manifold on #1 is where is the loudest is right in there but its really hard to tell.

 

Never stops when it purges air. And moves up and down with rpms. Makes me think its top end related.

 

Lots of times when running the over head you’ll have a booger somewhere you don’t see then fire it up and it spits it out.

 

Couple weeks ago I fired up my bucket of bolts the morning after coming in from SC. Soon as it started it sounded like an extremely loose push rod. Turned it off and fired it back up with same issue and the sound of a miss in the exhaust.

Pulled the valve covers and fired it back up, soon as it started it was smooth as silk and purring as usual.

Hopefully it’s something small with your engine….

 

yup I am guessing it will run to maybe even 50% speed but will not put out any horsepower or torque

 

the bd4c , experimental aircraft , been using them for decades to put together the frame . Its like an erector set type of build .