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Posting in the 6.2 section for reasons that will become obvious.
Finally got fed up with the DS4 on the 6.5 and ripped it off the engine. I had a great running 6.2 from an '88 G30 hanging around the shop for a couple of years so decided to use that DB2 as a replacement. (It is a DB2829 4646).
Here's what is done with this conversion, and the ensuing problem I have been encountering.
Turned up the fuel screw on the IP about 1/3 of a turn, went in thru the side plate, not the top as to not mess with the governor springs etc. Figured I could turn fuel up more later, but hoping this was enough to get the truck running well enough for fine tuning later.
Used timing marks on the 6.2 as a reference where to set initial timing on the 6.5. Did NOT change timing set or chain. Utilized the same gear that came off of DS4 pump as that has "run in" against lower gear over the past. Set dot to dot as should be.
The DS4 had a FTB (feed the beast) mod done in the past. As I retained the filter manager from the DS4 set up, I added a 3/8" barb in place of the 1/4" fuel inlet on the back of the DB2. I also run a Cummins lift that supposedly puts out 12 to 14 psi. I do not have a pressure gauge, but pressure is much higher than stock. Used the stock DB2 injector lines. As they were from a van, the short body injectors were installed on the 6.2, and they fit perfectly. Injectors were replaced a year ago, and have maybe 10K on them.
The truck ran, but heavy misfire on initial startup. Figuring lots of air in line I struggled with it for a while, but did not improve. I began advancing the pump(turning toward the driver side) Got truck to where it will idle smooth, but pump is advanced almost all the way to the limits of the slots on the IP. It still stumbles and smokes(white)a LOT on cold start. But with a little throttle for about ten seconds clears up and idles nice. HPCA and advance is hooked up, but the advance doesn't seem to be operating, so that could be that part of the problem?
Havent gotten the tranny shifting situation worked out yet,(planning on keeping it simple with a manual shift solution/probably order a Jake's, and a floor shifter after the holiday) so haven't actually driven truck in a real world sense. I have limp mode reverse and second, so I can move truck around the shop when needed.
Just seeing if I can get some input on what the timing issue might be.......Not enough fuel? Turn screw up more? Too much fuel (lift) pressure? Or something else I'm missing entirely?
TIA
Finally got fed up with the DS4 on the 6.5 and ripped it off the engine. I had a great running 6.2 from an '88 G30 hanging around the shop for a couple of years so decided to use that DB2 as a replacement. (It is a DB2829 4646).
Here's what is done with this conversion, and the ensuing problem I have been encountering.
Turned up the fuel screw on the IP about 1/3 of a turn, went in thru the side plate, not the top as to not mess with the governor springs etc. Figured I could turn fuel up more later, but hoping this was enough to get the truck running well enough for fine tuning later.
Used timing marks on the 6.2 as a reference where to set initial timing on the 6.5. Did NOT change timing set or chain. Utilized the same gear that came off of DS4 pump as that has "run in" against lower gear over the past. Set dot to dot as should be.
The DS4 had a FTB (feed the beast) mod done in the past. As I retained the filter manager from the DS4 set up, I added a 3/8" barb in place of the 1/4" fuel inlet on the back of the DB2. I also run a Cummins lift that supposedly puts out 12 to 14 psi. I do not have a pressure gauge, but pressure is much higher than stock. Used the stock DB2 injector lines. As they were from a van, the short body injectors were installed on the 6.2, and they fit perfectly. Injectors were replaced a year ago, and have maybe 10K on them.
The truck ran, but heavy misfire on initial startup. Figuring lots of air in line I struggled with it for a while, but did not improve. I began advancing the pump(turning toward the driver side) Got truck to where it will idle smooth, but pump is advanced almost all the way to the limits of the slots on the IP. It still stumbles and smokes(white)a LOT on cold start. But with a little throttle for about ten seconds clears up and idles nice. HPCA and advance is hooked up, but the advance doesn't seem to be operating, so that could be that part of the problem?
Havent gotten the tranny shifting situation worked out yet,(planning on keeping it simple with a manual shift solution/probably order a Jake's, and a floor shifter after the holiday) so haven't actually driven truck in a real world sense. I have limp mode reverse and second, so I can move truck around the shop when needed.
Just seeing if I can get some input on what the timing issue might be.......Not enough fuel? Turn screw up more? Too much fuel (lift) pressure? Or something else I'm missing entirely?
TIA
