300k_logician
Well-known member
Greetings.
(I apologize if this is in the wrong forum. I'm not sure where to put this, but this seemed most appropriate, considering that I'm testing an ALH)
For those of you who don't know, I'm presently acquiring education for the servicing of heavy-duty diesels. Sometimes I raise my hand in class to ask about why my VW is different, and typically get the answer, "because it's a VW", which does not satisfy my curiosity.
Following a lecture on cooling systems, where we learned about cavitation erosion, and all the various OAT coolants out there, I had a burning desire to test my coolant with test strips, so I went out and bought a kit.
(This kit in question is NAPA part #4107, it's a drop-shipped WIX heavy-duty diesel coolant test kit.)
When I tested my coolant, and also some spare G13 I had (as a comparative test), they both came out with ZERO nitrite!
So how DOES G12/G13 protect against cavitation? Please enlighten me. I know that G12/G13 were engineered quite well, but what exactly is it? How does it work?
And... do the turbo vanes create exhaust backpressure to reduce air/fuel ratios to speed up engine warm-up under idle conditions on the ALH? 'Cause DI diesel engines, according to the material, will never heat to operating temperature at idle unless airflow is restricted somehow. Do they default to 90-95% closed like the heavy-duty VGT's that the textbook discusses?
Thanks y'all!
(I apologize if this is in the wrong forum. I'm not sure where to put this, but this seemed most appropriate, considering that I'm testing an ALH)
For those of you who don't know, I'm presently acquiring education for the servicing of heavy-duty diesels. Sometimes I raise my hand in class to ask about why my VW is different, and typically get the answer, "because it's a VW", which does not satisfy my curiosity.
Following a lecture on cooling systems, where we learned about cavitation erosion, and all the various OAT coolants out there, I had a burning desire to test my coolant with test strips, so I went out and bought a kit.
(This kit in question is NAPA part #4107, it's a drop-shipped WIX heavy-duty diesel coolant test kit.)
When I tested my coolant, and also some spare G13 I had (as a comparative test), they both came out with ZERO nitrite!
So how DOES G12/G13 protect against cavitation? Please enlighten me. I know that G12/G13 were engineered quite well, but what exactly is it? How does it work?
And... do the turbo vanes create exhaust backpressure to reduce air/fuel ratios to speed up engine warm-up under idle conditions on the ALH? 'Cause DI diesel engines, according to the material, will never heat to operating temperature at idle unless airflow is restricted somehow. Do they default to 90-95% closed like the heavy-duty VGT's that the textbook discusses?
Thanks y'all!