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How do you hotrod a Detroit 6-71?

Vid was with engine cold, but yeah I agree on the rack adj and inj height needing set. The lope goes away completely when at op temp.
 
3500GMC said:
Vid was with engine cold, but yeah I agree on the rack adj and inj height needing set. The lope goes away completely when at op temp.
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It normally will if the rack is semi close, but the cold lope is a dead giveaway it needs to be done.
 
Should have added to my post #18 that Diamond 'Reo' came to be after the merger with White and Autocar. No more Diamond T trucks.

So it looks like I need to pull a rocker cover and confirm some things. Then go on the hunt for some age old Detroit diesel tools. Height gauge etc..
 
If you have a dial caliper you can use the tab that comes down from the bottom to measure height, maybe save a 20 bucks on the tool.
 
Most all the marine guys I see set the racks have used dial indicators instead of the height gauge. That way they can dial them in closer than just a go no go gauge.
 
Cool, got a few of those. Been watching some yootoobers do Detroit racks and it looks fairly easy. Have to develop a feel for it.
 
Your 4-53 would probably respond well to some bigger squirts and a good tune, that's probably what I'll do.
 
Yeah, I don't want to discourage you from it, my guess of 3grand would be buying new parts in a kit. Do some research to find a few turbo options, then pick on up from ebay. maybe some rebuilt injectors, then a used bypass. The rest you can make no problem.
 
You don't have to have the supercharger bypass to make a turbo work on a DETROIT. They offered quite a few engines with turbos that fed right into the turbo without a bypass. If you want the full benefit though, the bypass is a nice peace. I would imagine an old GM-X would probably work just fine on a 4-53. Then your stuck looking for injectors, but at least they are fairly cheap.
 
Why not? Does the 4-53 throw out any soot? If not a turbo may not do much until you can stoke the fire some. (injectors)
 
bison said:
If i run her wide open she burns pretty clean, let her fast idle(1200 rpm) for an hr and the fuel will be running down the stack.
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Wet stacking isn't uncommon on older diesels. If at WOT with a full load it burns clean, then a turbo isn't going to do anything, maybe even reduce your output some. You would need bigger injectors to take advantage of the added air.
 
THEFERMANATOR said:
Wet stacking isn't uncommon on older diesels. If at WOT with a full load it burns clean, then a turbo isn't going to do anything, maybe even reduce your output some. You would need bigger injectors to take advantage of the added air.
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Do you have a model number?,..i have no clue what is in there now
 
bison said:
Do you have a model number?,..i have no clue what is in there now
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It depends on what injectors you have now. It should be stamped on the injector itself. From what I could find it looks like the 4-53 was available up to 150HP from DETROIT in a N/A application, so an injector swap may be all you need to up your engines output. If I had to guess I would say an N55 would probably get you up to a decent output. You could go crazy though and run up to a N125(or at least you used to be able to get them that big), but that would be DANGEROUS amounts of fuel unless you were built up for it.
 
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