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Old 09-10-2017, 04:47 PM   #11
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Oh yeah I forgot to tell you about exhaust... The 2 stroke Detroit moves a lot more air than any other engine made, watch exhaust back pressure closely as; A. The air movement allows scavenging of the cylinders to allow for clean air for the next fire cycle and if the exhaust is backed up it won't have horsepower. B. The air cools the inside of the engine as it moves through so same as above fi the air can't get out the heat builds up and causes issues.
I did a repower one time and the salesman gave me a muffler to install he got from the owner trying to save a buck. The engine had triple the backpressure when I checked it on the dyno and the engine that was rated at 350HP would only put out 250HP. Dropped the muffler and had over 350 HP.
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Old 09-10-2017, 10:34 PM   #12
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Thanks for that very insightful post
Definitely gonna look into those upgrades
Probably just gonna leave it aspirated
It's got more than enough power to do what I need
It is a 6 inline 71
When I do the in frame I am going to attempt the impossible and solve the oil leaks
Those motors look so good in their original industrial green , I can't have it covered in oil
I can't believe that no one has chimed in about the fact that I'm gonna mount a hiab crane in my driveway
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Old 09-11-2017, 11:14 AM   #13
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Good luck with the oil leaks! If you beat them, you will have accomplished something few have. We have a pair of 6V92 DDECs on our boat. Years ago, I gave up on my SprayNine and rags routine. Now I just change clothes before going into the engine room!

Had a buddy with 8V71s in his boat. He had a very strict regime of strategically locating feminine napkins to catch each leak. The day after each trip, once the engines had cooled down a bit, he'd send his son into the engine room to "change the manhole covers"!

A naturally aspirated 6-71 is a rock solid engine, just messy like all its cousins.
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Old 09-11-2017, 11:15 AM   #14
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Sorry I don't know what I hiab crane is... I know I would have to fab something to do lifting at my place to attempt what you're doing. I have built several fire brush trucks in my "Shop" (It is a carport and a gravel driveway.) The last two were built out of M923 Military 5 ton cargo trucks. The biggest issue is wire feed welding in the wind. I used the old reliable "Cherry Picker" for lifting the pumps and engines onto the decks. Tanks were installed using ingenuity and levers made from wood.
As far as your 6-71 leaking oil having worked for a Detroit Diesel Distributorship for all of the 20+ years, if you put them together properly the only "Oil leaks" are supposed to be the air box drains. You can out a collector on those to keep it from dripping on the ground. If the drains are not open the oil can fill up and cause the engine to over-speed from a secondary fuel source being the oil. (Diesel engines don't runaway, the engines over-speed. The mechanics runaway, at least the ones that don't know what they're doing.)
The main thing that causes oil leaks is people use sealants on the gaskets. The gaskets are designed to be installed on clean dry surfaces, use guide studs on vertically hanging gaskets and use proper thread sealants and copper washers where directed on bolts in the service manual. I personally built a lot of engines and years later were still not leaking oil.
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Old 09-12-2017, 08:33 PM   #15
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Rough sketch
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20170912_203046.jpg  
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Old 11-28-2017, 09:26 AM   #16
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It's an inline 6-71
I'm going to perform an in chassis rebuild
I've opted to not turbocharge as it makes more than enough power to do what I need
I'm about to get started on the frame stretch and air ride axle upgrade
I'll provide pictures as they come
I'd post a picture of the truck as is but I'm kind of ashamed of its condition
I did manage to get my hands on a mint Brigadier cab that basically needs paint and the dog house flange for the in line engine as it was a 3208 Cat
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Old 01-12-2018, 03:00 PM   #17
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Keep us posted on your build. I'm a heavy equipment operator and bus conversion guy and really like the reliable 2cycle. To get in the right frame of mind to drive this truck first shut your hand in the door hard. Once you are good and pissed off it will run like a scaled cat. As you get to know your rig pay attention to the oil level every time that you check it. Dad had a 318 in an MCI bus that would lose about 1 gallon of oil on the 850mi trip from Evansville, IN to Orlando. He noticed that the oil level was often in the same spot when he check it. Dad made a new mark on the stick at this level. With the oil at the new mark on the stick he rarely needed to add oil. The old Detroit will always drip a little oil but should not puke it out excessively.
Note: be sure to use the correct oil. 15W40 is for 4cycle engines. In most places your 2-stroke needs straight 40wt diesel oil.
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Old Yesterday, 05:47 AM   #18
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Look forward to seeing pics of this build!
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