| Author |
Message |
jack buehler (198.98.11.185)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 04, 2003 - 7:12 pm: | |
Hi, Does anyone have info on converting a 1986 8.2 Detroit normally aspirated to a turbo? Any info appreciated. Thanks |
Skorpio (Skorpio) (24.92.193.195)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 04, 2003 - 9:00 pm: | |
Haven't I read here that these engines blow head gaskets already, somehow I think turboing would be a bad Idea. But the question that this brings up, do 4 stroke diesels with turboes have lower compression ratios like turboed versions of gas engines do? I know on Detroit Diesels, the turbo is not really doing the same thing a turbo normally does, on a 2 stroke DD the turbocharger allows the intake ports to be smaller, and exhaust valve duration to be a little shorter. But the boost provided is only marginal if anything at all. |
Paul (205.210.53.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 05, 2003 - 6:40 pm: | |
I don't think it could be done and stay together. If I remember the turbo engine has a different block and crankshaft. Also the 8.2 did have problems with head gaskets even after the conversion to larger head bolts. The only thing that I liked about the 8.2 was fuel economy. |
LeeHolsman (64.12.103.49)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 05, 2003 - 10:01 pm: | |
Jack--I have an 8.2DDT. I don"t think you can add "T". "DaBook" shows the na has 4.41 stroke & the"T" stroke @ 5.00 in. Lee |
John the busboy (12.82.139.118)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 06, 2003 - 3:12 am: | |
Different pistons, head gaskets. etc.
The NA has 18:1 compresson ratio and the T has a 17.4 or so CR.
If you don't put them together right you will have problems.
It would probably be cheaper to find a used turbo engine than to convert. At least if you want to do it right.
John the busboy |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 06, 2003 - 9:24 pm: | |
I'm in the middle of sticking a "Smoke Turbo" on my 4 stroke Cummins 743, and from what I've been told by more than five "experts", you can do it to almost any normally aspirated engine without further mods to pistons, compression ratios, etc. The hitch? A "Smoke turbo" is a wastegated turbo that's set for no more than 5-8 psi boost max. The reason for it is not to gain a lot of additional horsepower, but instead for "altitude compensation", ie to not loose horsepower at altitudes and higher temperatures. It also eliminates or at least severely reduces smoke at higher altitudes as well. For me it's worth it totally... At sea level I can nail 6% grades at 55 without problem but at 5000 feet, that same grade finds me following loaded concrete trucks in the far right lane! It's something like 25% horsepower loss for a normally aspirated engine at 5000', 100 degrees outside... the smoke turbo makes this a non-issue without major engine modifications...
I kind of see this a good advantage too, because adding the turbo and not having to lower my compression ratio will mean easier starting in the cold...
Cheers
Gary |
john marbury (Jmarbury) (65.100.118.81)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 06, 2003 - 10:36 pm: | |
Gary,
that sounds interesting. Where can I find out more about this?
John |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 07, 2003 - 2:49 am: | |
John,I got my turbo from:
Steve Rash
800-331-8934
Diesel Services, Inc.
Grand Junction, CO
It wasn't all that cheap BUT it is new, custom assembled by Garrett specifically for my engine and application, etc. Steve is a real good guy and knows his stuff.
I had to scrounge for a turbo exhaust manifold for my engine 'cause it is so old ('69), but I eventually found one and am just finishing up making an adapter plate. The rest of the installation will be easy (ha!!!)
I first got on to the idea by schmoozing with a diesel instructor at a local college. Then I asked quite a few diesel shops if this was a crazy idea, and I was told "no, it's done a lot". I was also told I could probably go as high as 10psi boost without hurting the engine (again, with no internal mods, basically just bolt the turbo on) but I'm gonna stay at 5psi max I think, to be conservative. Like I said, I'm not really after any extra horsepower, but I certainly am into keeping what I already have at sea level, and reducing the embarrasment of constant smoke at higher altitudes (not to mention reduced mileage)
Cheers
Gary |
Henry R. Bergman, Jr. (Henryofcj) (65.194.145.47)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 09, 2003 - 8:58 pm: | |
Hello Steve;
Do not for a second second guess Gary as he probably has FORGOTTEN more about 743 Cummmins in general and CROWN SUPER COACHES in particular than I will EVER know and I still think I am a know it all!!
As far as your 8.2 goes, please do not be put off by other suggesting you can NOT do what YOU want to do with YOUR 8.2. Bet you a six pack you can hang on the proper turbo....
....go to a reasonable sized injector (N90's anyone?) bump the governor to about 3600, maybe go to head studs rather than bolts, a special thick headgasket, plus a huge intercooler and end up with.....
....around 350 reliable horsepower with about 800 pounds of torque. Possible? Sure it is. Just keep your foot out of the mill and watch your pyrometer and boost gage. Go for it and burn rubber! Henry of CJ. |
jackbuehler (198.81.26.174)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 18, 2003 - 6:40 pm: | |
Thanks for all the input. Just got back from picking up this bus, the 8.2 did 9-10 mpg, power ok at sea leval, not so great at 2000+ ft altitude. I could live with the performance at sea level OK, but its a little sad in the mountains. Thanks Gary I will consult Steve soon. Jack Buehler |