Joe hadder
Member
Does anyone know what the proper reman number for the injectors on a 1995 3406c. It is rated at 350hp, but I want to update to >400hp, if possible.
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Cat 3406c injector
- Thread starter Joe hadder
- Start date
RZucker
Senior Member
Talk to Cat, Give them your engine serial number and arrangement number, On a "C" I doubt an injector change alone is going to get you 50 extra HP.
Nige
Senior Member
100% correct RZ. To go from 350 to 400 will require injector, turbo, and piston (higher compression) changes.
It would probably be cheaper to look for a 400 HP engine.
Post the Serial Number of your current engine.
It would probably be cheaper to look for a 400 HP engine.
Post the Serial Number of your current engine.
Joe hadder
Member
My serial # is 3zj59805, AR# 1117436, perfect spec#2t5597,timing is 11deg btc. I'm only getting around 15 psi boost at load. Checked turbo and fuel. Could it be the afr diaphragm?
Nige
Senior Member
AFAIK the air/fuel ratio control only assists with improving engine response and reducing black smoke, not out-and-out boost control. From the manual - "The fuel ratio control limits the amount of fuel to the cylinders during an increase of engine speed (acceleration) to reduce exhaust smoke. Properly adjusted it also minimizes the amount of soot in the engine."
The dyno spec for your engine is 19.5psi of boost, not a miilion miles away from the 15psi you have right now. Also it's measured with the engine producing 350BHP @ 1800RPM on a dyno, a big difference to you loading the engine in the truck. TBH I would say that 15psi of boost in-chassis is probably somewhere around where you should be for that engine.
In answer to your OP, the correct Reman injector for your engine is listed as 0R-4339 (OEM Part Number 100-7558)
The dyno spec for your engine is 19.5psi of boost, not a miilion miles away from the 15psi you have right now. Also it's measured with the engine producing 350BHP @ 1800RPM on a dyno, a big difference to you loading the engine in the truck. TBH I would say that 15psi of boost in-chassis is probably somewhere around where you should be for that engine.
In answer to your OP, the correct Reman injector for your engine is listed as 0R-4339 (OEM Part Number 100-7558)
d9gdon
Senior Member
That air fuel ratio can limit the boost as it will limit the amount of rack travel. They gave occasional trouble. Check the steel signal line from the AFR to the head to see if the fittings have backed off and leaking from vibration. The rubber diaphragm can also get old and crack. They cost about $6.00. The part number is either a 7W-0802 or a 6I-1564 depending on which AFR you have, and I'm not smart enough to narrow it down farther in SIS.
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Easy to check the AFR diaphragm. Disconnect the tube at the inlet manifold and try and suck a vacuum on the AFR. If you can get your tongue to stick to the tube then the diaphragm is good.
Also the auto advance unit on your engine is prone to the flyweights breaking. Probably worth checking that as well.
Also the auto advance unit on your engine is prone to the flyweights breaking. Probably worth checking that as well.
Joe hadder
Member
Thanks for all the info, guys. I will start checking these things as soon as I have a day off. How would you check the advance mechanism? Pull the cover and do a visual check first? Thanks again.
RZucker
Senior Member
Just curious here, Is this 3406C an electronic PEEC engine? Otherwise it's just a B model. I think one of the worst parts of the PEEC engines was the advance unit with the stepper motor control. What a pita to reset after you found the problem and replaced the offending parts. The governor end sucked just as bad.
Nige
Senior Member
The Serial Number quoted by the OP is a 3406B - No PEEC.
I remember having terrible troubls with PEEC-engined gensets at altitude. The atmospheric pressure-related fuel/timing compensation used to run out at about 2000ft above sea level IIRC. We had them at 10,000ft......!!
I remember having terrible troubls with PEEC-engined gensets at altitude. The atmospheric pressure-related fuel/timing compensation used to run out at about 2000ft above sea level IIRC. We had them at 10,000ft......!!
Truck Shop
Senior Member
If it's a 3ZJ it should be a mechanical B, 3ZJ's were the last of those IIRC. A 3406C should be a 3KC IIRC. But the C can be converted using 3ZJ injection pump and advance.
There was a Cat conversion re-rating a 350 to 425 hp with out a piston change, but it did use a different turbo and nozzles. I converted two using the Cat OR conversion #.
There was a Cat conversion re-rating a 350 to 425 hp with out a piston change, but it did use a different turbo and nozzles. I converted two using the Cat OR conversion #.
Nige
Senior Member
Good info.
In the OP he said that he wanted to go more than 400HP. The > was easy to miss. I couldn’t see that happening without upping the compression ratio. As well as the hard parts I’m sure there would be some sorcery to do in the FIP.
In the OP he said that he wanted to go more than 400HP. The > was easy to miss. I couldn’t see that happening without upping the compression ratio. As well as the hard parts I’m sure there would be some sorcery to do in the FIP.
Joe hadder
Member
Any help is appreciated. Any ideas on injector # or turbo #? It is mechanical. Even upping the hp to 400 would be a big help. Lots of big hills here!
Nige
Senior Member
By the sound of it you need to be talking ncely to Mr Truck Shop and get some upgrade kit Part Numbers. If 400 is do-able with only injectors and turbo (no fuel pump changes seems strange) then maybe that's the best bang for your buck.
kshansen
Senior Member
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Yes try scrolling back up to where Truck Shop posted above and click on his name over to the left then "Start A Conversation". He might be kind of busy with his B model Mack project so give him some time to reply!
Joe hadder
Member
Again, thanks for the leads. I will post when I get somewhere !
Joe hadder
Member
Hi Truck Shop. Is there any chance of finding those injector numbers and turbo #? Not a rush, and all help is appreciated. Thanks.
Truck Shop
Senior Member
I have a few contacts I can try, I did those two re-rates in 1999-so twenty years ago Cat offered a re-rate with OR numbers I don't know if it is still available from Cat. But the ones I did
were re-rated to 425 hp I was told by Cat at the time re-rating to 400 hp was worthless and it would be a mutt and the same could be said for re-rating to 460 Hp. Both engines that I did
were very strong runners for 425 hp. The up-grade also came with a chip which had to be set-up with ECAP {I think that's right, please correct me if I'm wrong Nige}. But I do know of one
that was re-rated to 400 hp and it truly was a turd.
were re-rated to 425 hp I was told by Cat at the time re-rating to 400 hp was worthless and it would be a mutt and the same could be said for re-rating to 460 Hp. Both engines that I did
were very strong runners for 425 hp. The up-grade also came with a chip which had to be set-up with ECAP {I think that's right, please correct me if I'm wrong Nige}. But I do know of one
that was re-rated to 400 hp and it truly was a turd.
RZucker
Senior Member
Umm, ECAP (or ECAT?) was for the PEEC engines. I remember using it before ET to set those damn advance units. Had to screw the sensor in or out to get it in the "band" after standing on your head to get the wedge tool in behind the advance unit.