Thread: Pro 785 CDI ?
12-08-2009, 07:21 PM #1
Pro 785 CDI ?
What is the difference between the 1997 Pro 785 CDI and the 1998+ CDI's? Which one would be better to use in my Sleeper project? For those not familiar click the 'Current Plan' link in my sig. for an overview.
12-08-2009, 07:34 PM #2
Timing curve...32 degrees @ 3000 RPM with the '97 vs. 36 degrees @ 3000 RPM with the '98.
12-08-2009, 07:47 PM #3
This may open a big debate, but which one is better? There has to be such a thing as too much advance! I don't want to burn up my pistons, but I also want to utilize the advantages of my PSI cylinders and the high compression OP head. I was going to just use my '94 650 CDI but I am concerned that the rev limiter will be too low for real power.
12-08-2009, 10:11 PM #4
- Join Date
- Oct 2006
- Cleveland OH
The 97 is recommended for a 650/750/780 conversion because of your reasoning.
12-09-2009, 10:23 AM #5
The big difference between the 1997 and 1998+ is the exhaust valves.. The 1998+ raise the exhaust valves 2mm higher. The 4º initial timing difference was added because the 1998 785 Pro weighs 40 lbs more thean the 1997.. haha!
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