IP timing - start or stop of fuel delivery? - Page 2 - PeachParts Mercedes-Benz Forum

Stevo · #16 01-22-2007, 08:56 AM

Quote:

Originally Posted by Samuel M. Ross

I'd love to interject a more detailed list of steps of the method my " Indy " friend showed me but I don't have time just now. I have nicknamed it the " Spit at ya " timing check test for these in-line Bosch
IP(s). Basically you only take the bottom fuel line connection [I suppose you could take loose the top]. There is no need to disassemble anything more or to pump fuel in any way.

You start by opening the oil filler cap so you can see when the engine is on the compression stroke for #1... this by seeing the #1 cam lobes approaching the up [on top ] position. Take the #1 fuel line loose. By taking the bottom loose, I think you are more likely to see the fuel spit out when the IP unloads into the fuel line. You watch the crank timing marks as soon as you see it dropping below 30-40 degrees and then when it does spit out fuel, this is essentially where the IP's timing is set when you look at the timing mark. If it is 24 Deg. + or - 1 to 2 degrees, I for one feel that this is all you need. If off by more than 2 degrees, yes you tip the top of the IP toward the engine to advance the timing and the reverse to retard the timing.

Just funning ya Kevin,

I'm gona give that a try. Its kind of in the same category as checking the chain stretch the "quick and dirty" way, Good enough for a "ball park" idea.

kartoffelpanzer · #17 01-22-2007, 01:16 PM

Just did it to 24deg. I missed the point on 26deg BTDC...does that tend to help performance?

Rob

Samuel M. Ross · #18 01-22-2007, 03:06 PM

Quote:

Originally Posted by kartoffelpanzer

Just did it to 24deg. I missed the point on 26deg BTDC...does that tend to help performance? Rob

... when I moved my IP's timing from 20 Deg. BTDC to the correct 24 Deg. I found a noticeable reduction in power. Keep in mind my 240D's "spec" power is only 67 H.P.! So I would expect power loss to continue as you further advance the IP's timing... that is until you start injecting fuel while one of the valves is still open. I have no idea what timing mark this would be and what would actually happen but personally I would not take it beyond the "spec" 24 Deg. BTDC. Remember gasers are timed ~6 to 12 Degrees BTDC so I would be happy with whatever you get from your diesel at 24 Degrees. You might even want to retard it 2 to 4 derees, say 20 to 22 Deg. BTDC.
I don't think you want to reduce your power any further on an engine that has so little as it is!
IMHO... Regards,