Equipment Haulers

Cam overlap is when both the intake and exhaust valve are open. Although small you now you have a "path" for airflow.

 

How many engines have cams like that? Not challenging you, just wondering.
I got some sleep and just thought of something, for a little more conversation.
When the air flows over the open end of the stack, a vertical one, with no curve at the end, you would actually be pulling a slight negative pressure due to the venturi effect, so you if you were to get any flow, it would have to travel all the way through the engine first.

Come on now, there has to be more of an injunear type on here besides PB and myself.

BTW, I've heard this same conversation a few times, it's an interesting argument. If the customer wants the stack taped, no problem, but I'm suspecting it's more to keep stuff out of the stack, than the turbo spinning backwards. Plus with that slight negative pressure, the turbo, if it were to spin, would be in the correct direction, with no lubrication of course. I'd like to know what the resident injunear at Cat would say?

 

Huh, not saying they don't, but that would be an interesting thing to see.
I'm no mechanic by any stretch, but have learned a couple things on physics by mistake!!

 

I did the same thing, once. By the time I quit, I was babbling like Daffy Duck!
You would hope the dealer would have a final answer for us, Cat R&D may be the better option though. I'll "TRY" to contact them tomorrow, depends on when I leave for work.
Why was extended idling bad? Lower RPM on turbo = poor oil wedge?

 

WD-40 worked well getting the duct tape residue off of the dorm room walls back in college....I'd imagine it'd work just as well on an exhaust pipe.

How many engines are there? Every 4-cycle engine that I'm aware of has a valve overlap between the exhaust and the intake strokes...the intake valve begins to open before the exhaust valve is completely closed.

 

Double huh! Told ya I wasn't a mechanic. I didn't know that.

 

I always cover the exhust on anything i haul with on exception which is a 583k cat sideboom the has a flapper in the exhust. the reason i cover everything is because the air going into the turbo makes it spin with no oil to lube the bearings which over multiple times will cause turbo failure.

 

Okay; this is what I just sent to Cat, we shall see.
When transporting a piece of equipment, how important is it to plug the end of the exhaust pipe? I'm being told it is to prevent the turbo from spooling backwards. Is this true? Or is it basically just to prevent dirt/debris from entering the stack and possibly the turbo?

Thank you;