Quote:
Originally Posted by Ccmano
That has always been my understanding. As a matter of fact its one of the factors that caused engine failures early on when plant personnel revved the engines to high rpm in cold weather conditions during the Transporter loading process. As a result the time to fire the engine was lengthened and the revs were limited in cold conditions. Its written up in the book Heart of the Beast. Cause quite a stir and weeks of shipment delays. Personally I?m fine with the longer startup.
H
 |
In actual fact, the ECM does not have an input for oil pressure. I guess it wasn't a consideration for software control back then.
I find the the LT5 pressurizes its oil very quickly when cold because the oil cooler feed line is disengaged by a thermostatically controlled valve.
A potential problem occurs with oil pressure when the engine is in a warm state and the oil cooler is engaged. On a warm start-up, oil flow tends to fill the cooler network before traveling to the to top of the engine, including the timing chain area.
The workaround for the warm start scenario relies on the elevated placement of the oil filter. The LT5 oil filter has a check valve in it which stores oil and releases it after the engine starts. This provides oil to the top of the engine when the thermostatically controlled oil cooler valve is diverting oil away from the engine.
It is a very good idea to restrict engine RPM during warm up. The stock ECM for the LT5 does do this by refusing Full Power Mode (even when selected) until the engine is warm.
Notwithstanding, the original ECM firmware should have had "idiot-proof-code" in it to prevent abusive behavior like that of the car-jockeys. It is my understanding the newer Corvettes do have this feature.