turbo bark

[BLK ICE]

not good for turbos? something ive heard and always wondered

[tireburnin54]

Doesn't hurt them. It is a turbo "stall", the fins cant catch up with the air. I work for Cummins and this is a fairly common problem on the Heavy duty engines

[BigRedChevy]

I wouldn't want to go around doing it all the time, but if it happens don't worry about it.

[Bryan@ATS Diesel]

Originally Posted by tireburnin54

Doesn't hurt them. It is a turbo "stall", the fins cant catch up with the air. I work for Cummins and this is a fairly common problem on the Heavy duty engines

I beg to differ......thats how my factory turbo went . Basically what happens is your turbo is spinning at 120,000+ rpm and when it barks, it is dropping as much as 40-50,000 rpm in a split second. This can bend shafts, hence grenade your turbo.

[Tow Master]

Ya definatly not a good thing. I only had mine bark one time when I was doing a burn out and hit the brakes.

[Killerbee]

The bark noise comes from airflow disturbance, blade stall that results from an excessive pressure ratio, Page Ranking. It is an enormous mechanical stress.

Part of what makes it so bad on the LLY, is the restricted compressor mouthpiece. I am testing the removal of that restriction on bark.

[Buck]

Don’t diesel trucks and cars bark every time you get out of it to some extent? Gas turbo cars and trucks all have one thing that diesel cars and trucks don't have throttle blades (except for new trucks that have them for emissions).

when a gas car or truck with a turbo closes its throttle, the engine goes into vacuum which sends a single via vacuum hose to the blow off valve which releases the built up turbo presser to keep it from surging back ageist the turbo and stalling it.

So if your truck dose not have throttle blades or a blow off valve then every time you’re under load and get out of the throttle (pulling a trailer up a hill and some jackass cuts you off) the pressure will surge back to the turbo to some extent. So you would think that the factory would build accordingly?

I might be wrong but I think that’s how it works.

[BLK ICE]

well, my turbo is insanely loud. and even under going normal throttle conditions, letting off the throttle and even when it shifts you can hear it. im assuming at such as slow rate of air that its not doing much damage at that rate but more towards WOT and letting off could be bad.

[Pat@BD]

What happens is you have all this exhaust energy driving the turbo. That in turn has the compressor wheel compressing air and sending it through the intercooler and then into the engine. When you let off the throttle quickly you no longer have the exhaust energy driving the turbo, but you have all that pressurized air on the compressor side. It is looking for the easiest way out. The easiest way out isn't to continue on to the motor, but to try and come back through the turbo. This causes the compressor wheel to slow dramatically which can hurt either the wheel or the shaft. Not a good thing

[Tow Master]

Originally Posted by Pat@BD

Not a good thing

But it just sounds so cool