| Author |
Message |
Buddy Matthews (65.205.150.145)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 04, 2002 - 12:51 pm: | |
I have a 6-71N in a 4104.
I recently had the opportunity to get a 4 valve head and a turbo for this engine.
I know it requires a rebuild - but can someone tell me exactly what all has to be done.
I got my blower rebuilt(had bad seals) and I have been taking things off - cleaning painting etc - I am trying to decide whether to just replace my 2 valve head with the 4 or do the whole turbo - Appreciate any info. - Thanks |
RJ Long (24.127.8.58)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 04, 2002 - 1:25 pm: | |
Buddy -
You already have a LH engine, so that's part of the battle won.
Turbos have different pistons, among other items. You'll also have to customize the intake and exhaust plumbing to mount the turbo, plus provide for oil supply and drain line from it. Injectors will also have to be matched to the turbo engine. Check w/ your local DDA distributor for the correct parts. Be sure to give them both your engine serial number and the model number off the turbo.
Because of the additional heat produced, you will need to make sure your radiator is in excellent condition.
6-71Ts have about 275 hp, the same as a stock 8V71 in a 4106. A 6V92TA conversion can be bumped to 350 hp.
HTH,
RJ |
jim (209.240.222.32)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 04, 2002 - 1:46 pm: | |
the 4 valve head would be a good addition to your engine whether or nor you choose to turbo the engine.....rj is right about the turbo engines using different pistons and sizing the injectors and timing them to turbo use...... |
Gary Carter (216.17.49.199)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 07, 2002 - 11:03 pm: | |
Just a note on pistons. The DD distributor in Minneapolis never uses the low compression pistons in rebuild. Ya YA I know what the book says, but have also found out what the main mechanic does.
He said useing the turbo pistons makes the engine hard to start and it will smoke. |
Buddy (65.205.150.145)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 08, 2002 - 10:08 am: | |
Hmmm thats interesting - I wonder what pistons he does use. I think I have read that there are three types for N's E's and T's. Then of course is he having any problems.
I hear high compression pistons will burn up if
they are subjected to the higher heat of a turbo.
Also does anyone know if these turbos require an intercooler. |
Mallie (208.165.104.15)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 13, 2002 - 1:19 am: | |
Gary I would sure have to disagree with your DD.
I guess you can use what you want, ,But a DD using it is completely unforgivable.
I can tell you with absolute certainty, that high compression pistons will not work very long in a turbo engine. In order to keep it together, a pyro will be necessary, and you will just have to drive it with kid gloves to keep it from blowing up. Certain not be able to stand on it when you need it on hills. Sure lower compression will make it harder to start when cold.
Mallie |
Scott Whitney (66.214.66.193)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 13, 2002 - 7:57 pm: | |
Here is a question for you DD guys. . . WHy the heck don't our DDs have glow plugs? Wouldn't that eliminate all our cold start worries?
Scott Whitney |
Tom Caffrey (Pvcces) (12.146.33.66)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 13, 2002 - 11:53 pm: | |
Scott, glow plugs are used in prechambers; DDs don't have prechambers. Maybe because without direct injection, which is used in today's high efficiency engines, their fuel economy would be even worse.
Also, what effect would the two stroke have on the ability to even use a prechamber? I don't know, but it might not be practical.
However, I would think a preheater for the intake air could be managed. I have seen some very effective ones used on four stroke engines, some of which used very little electrical power.
I would think that you would probably run into stiff oil problems if you tried cranking a DD with 40 wt oil in very cold weather, so going to a lighter oil might be needed.
When we need to get an old DD started in miserable weather here in SE Alaska, nothing seems to do as much good as a weed burner held a fair distance from the air intake on the blower. Try it; it'll make a believer out of you!
Watch out for burnables and flammables.
Tom Caffrey PD4106-2576 |
Stephen Fessenden (Sffess) (63.27.89.228)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 14, 2002 - 9:05 pm: | |
And remember that when the rest of the engine is not preheated in VERY cold weather the piston and bearing tolerances may be too close for good lubrication. That can be the case with aircraft engines and I assume it also applies to DDs. |
john wood (206.252.234.92)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 18, 2002 - 6:16 pm: | |
A hair dryer in the intake works if you leave it in long enough to warm the air filter up. |
Randy Fulkerson (Desertstarservi) (24.221.237.204)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 03, 2002 - 11:14 am: | |
Buddy, e-mail me about Lefthand 6-71TA's
Randy |