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Modified 6.2 turbo diesel

Why wouldnt 4 plunger work? Just need to be able to time the cylinders correctly, meaning put the lines to the injector in the correct firing order for the way the pump distributes it.
 
buddy said:
Why wouldnt 4 plunger work? Just need to be able to time the cylinders correctly, meaning put the lines to the injector in the correct firing order for the way the pump distributes it.
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i think some one said something bout the cam gear not working i may be wrong on this whole deal tho
 
Woody35 said:
the db4 just spins the opposite way the ds4 does. thats it
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sounds like that would be a heck of a problem wouldnt it spin backwords then on our trucks????? or would the lines just have to be routed to get the correct injection according to fireing order
 
I have not tried a 4 plunger head and rotor peninsular has, I have a good part number for it and its avalible. You are are right about the cam ring some thing is different Ive never seen one though,Im guesing its the size of the cam pin wich ive snapped several of them with the 1/2 inch 2 plunger pump I built ,my cam ring is now locked with a 3/8 alloy steel bolt its a rare cam ring from early model 5.7 olds diesel and head is from a Ih diesel . When I talked to peninsular they said they cuoldnt get the 4 plungers to fill, Ive tried a lots of different pump mods , some would make the truck almost un driveable except full throttle. My current mod is the best yet but the plungers fit loose, a good tight pump makes a huge differance. Yes some might spin the oposite direction I think the IH 6.9 does, thats not an issue ,the cam rings have an arrow on both sides you can flip it either way for counter clockwise or clockwise rotation, chevys are counter clockwise. I love my pro 52 turbo! I know very little about the ds4 I talked to Bill Heath he couldnt tell me the ds4 plunger size, from what I understand its a 4 plunger .310 ,so the ds4 should be able to pump some serius fuel,so either pluger stoke is very short or all these programs are leaving alot on the table,Bill said his program maxes the ds4,maybe they also have a plunger filling problem.Years ago Bill had an 80s chevy truck with a p pump that ran 11s in the quarter mile. Bill said Im building my motor totally wrong , he might be right ,but if it had high compression I think i would have blown the bottom end after two years of street driving.My 6.5 lasted one year and cracked a piston ,it had a mild pump and 35 psi boost, with stock compression.my 6.2 compression is very low probably 16to 1 .
 
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6.2 turbo said:
The 4 pluger are .310 just like regular 6.5 but 4 instead of 2,peninsular also builds a 2 plunger .350 I ran a .370 rotor out of a john deere that worked good but it seized one time after I adjusted the timing. I had it at lebanon fairgrounds, it just spun it was over 2000lbs to light. I have to be pretty happy with it before I haul it to the Buck,we live in myerstown. Most people think very little of 6.2 ,6.5 diesels and say it cant be done.
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I do agree that people think very little of them and I do think they did cut corners on building the engine as far as a diesel is concerned. But, the good thing most all your problems or issues can be solved with aftermarket parts. I've been over to Myerstown a few times for work as we had to pick up a new truck we sold to TNT Sanitation/Garbage company to bring back to our shop in Lancaster. I work for Freightliner as a heavy truck mechanic. Do you have experience in diesel fuel injection or do you just know the pumps real well to where you've taken them apart many a time to tinker with the larger sized plungers? The different sizes they ran is very interesting and I'd think if you ran a .330 or .350 in a DB2 at least you'd be doing alright. Notice you mentioned Columbus Diesel, which I did check out and they seem to be a nice business for any diesel fuel injection need. Do they sell a Stanadyne DB4 pump you could buy to put on a 6.2/6.5? I understand you wanting to wait til you get the truck right for the Buck and it sounds like an over-amped 6.2 with the fuel pump mods and the pro 52 turbo. By the way who makes that turbo and what are the specs on it? Are you running the stock cast iron crank and what did you do for the pistons to get the 16:1 compression? I'm working on a buddie's 94 Suburban here and there that we are putting another 6.5 engine in due to his original engine block breaking in a few spots where the starter/bolts mount. He is electronic fuel (with the DS4), but I know the both of us would be eager to check out your truck sometime. Thanks.
 
chevyCowboy said:
sounds like that would be a heck of a problem wouldnt it spin backwords then on our trucks????? or would the lines just have to be routed to get the correct injection according to fireing order
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Depends what backwards means. Does that mean the crank input spun the opposite way, or the internal shaft did off of a gear within the pump?

Ours spins backwards from the crank, because we put a gear to the cam drive, which is driven by a chain. So the crank and cam spin the same way, but the IP gear spins the opposite way as the cam. Does the DB4 input or output, or both spin opposite. The pump may spin either way fine, many diesels will run "backwards"
 
my understanding was the db4 runs in the opposite direction the ds4 does to get the same firing order. but im not 100% sure
 
I got my down pipe on and a new turbo hose ,down pipe is good but the turbo hose is not the sweetest.I test drove the truck,it does not run that well,it boosted 50 psi,I advanced the timing some, it ran a little better boost was 40 psi, I advanced some more, boost is down to 30 psi. It also de fueled at 4000 rpm which is strange because it has a governor bypass . There is definetly a fuel problem at higher rpms it kinda surges ,like air and my pump charge pressure was over 100 psi ,seems like it not taking it away. My pump experience is from working on my own db2 pumps. The pistons have about a .90 thousands dish to about 1/4 inch from the outer edge 16 to 1 is estimate. I need to do something about my injector pump, if I had lots off money I would by a 4 plunger head and rotor tomorrow. Maybe I will get another one custom machined,the 4 plunger one would be fun since some people think it wont work, I not sure if 4 plunger x.310 would be enuff fuel for me. The pro 52 is a hx 52 with a billet compressor wheel it might be 71 mm inducer not shore, the exhaust housing cm is 19 it should be a 16. Once I get all figured out, if ever id like to build a tahoe or burb for my wife to drive, that 94 burb sounds interesting. The whole motor is stock, except for arp head studs I think the 6.2 is stronger than the 6.5.
 
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I worked on my 6.2 a little tonight, found one problem that was causing it to de fuel, its a solenoid valve that uses a diaghfram rubber that got swelled from diesel fuel thus restricting flow. This is all a homemade set up. I still need a new head and rotor , if I build a 4 plunger pump and its not enuf fuel for my 6.2 ,would any body be interested in buying it. I think maybe I should build 4 plunger pumps and sell them, would have to do alot of testing first.
 
Reasonable price and as reliable as the current setup (not hard to achive) I would be in.
 
It would take some work to get lots of fuel at high rpms probably 2500 and up and not be finicky, still not finished with my last idea,priced a head and rotor this morning,its close to 500 $. I might just get another one edm machined into a 4 plunger. If I could build a reliable 4 plunger pump with top end fuel I think it would be the first one , any body can get lots of fuel at lower rpms. Does any body know what is max plunger travel on the ds4.
 
6.2 turbo said:
It would take some work to get lots of fuel at high rpms probably 2500 and up and not be finicky, still not finished with my last idea,priced a head and rotor this morning,its close to 500 $. I might just get another one edm machined into a 4 plunger. If I could build a reliable 4 plunger pump with top end fuel I think it would be the first one , any body can get lots of fuel at lower rpms. Does any body know what is max plunger travel on the ds4.
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id buy one
 
I read the ds4 thread , I think the ds4 needs a reground cam ring, also the fuel solenoid sounds like a problem, under full load you dont want it pw modulated. I will stick with mechanical.
 
I'd be interested in a 4-plunger pump and I don't even own a 6.2 or a truck for that matter. If anything is stopping these engines from getting a good bit more of reliable power it's the injection pump, as it has been discussed plenty of times before. If you are going to be hard pressed to install/fit larger plungers in a DS4 that may be the case with the DB4 (but wouldn't know until you tore into one I guess).
 
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