I keep hearing about a "silencer ring".

[Archive]

My new 12cm turbo has what looks like a removable ring at the inlet of the turbine on the intake side. It appears to be shaped to help smooth the airflow into the turbine. Is that the "silencer ring"? If so, how could removing it increase boost?

------------------
http://coffeewithJesus. homestead.com/web1.html 89 1-ton, Amsoil System 3000 5-30,K&N air filter, cleaned-up exhaust, Dynomax straight-thru, rebuilt pump, 12cm wastegated turbo, thermostaticly controlled twin 14" electric fans, intercooler, modified 518 OD transmission, Gear vendors OD controler, R-134, louvered fenders, 93 aftermarket smoothe grille; 78 35'Avion, 93 Lance 900 slide in with generator and power jacks. Jesus saves!

 

[Archive]

YESSSSS! You are absolutely correct! The ring will "smooth" the fluid intake air at the transition point of the machined inside diameter step. The silencing comes from reducing the turbulent wall effect of a sharp edged inside diameter change. Does it increase power or boost to remove it? NO.
Why did the 12cm's on the later engines have a "TRANSITION RING", while the earlier 16, 18, and 21cm's didn't? Because the 12's really spool up quickly, and they intake the compressor side air at an increased velocity.
As a matter of fact, I believe the TRANSITION RING is an enhancement to the charge air system, however small.
I have retained the ring in my '98, and I have enhanced the sound of the Cummins by several other methods.
Regards.

------------------
'98 Cummins 12v, Big Medicine. Got Diesel.
http://www.ecpe.vt.edu/~dfritz/RIDES/frank_s/classic92.htm

 

[Archive]

Thanks Old School; Your answer makes more sense than removing it. It just didn't LOOK like it would help anything!

------------------
http://coffeewithJesus. homestead.com/web1.html 89 1-ton, Amsoil System 3000 5-30,K&N air filter, cleaned-up exhaust, Dynomax straight-thru, rebuilt pump, 12cm wastegated turbo, thermostaticly controlled twin 14" electric fans, intercooler, modified 518 OD transmission, Gear vendors OD controler, R-134, louvered fenders, 93 aftermarket smoothe grille; 78 35'Avion, 93 Lance 900 slide in with generator and power jacks. Jesus saves!