| Author | Message | ||
| Joe Franklin (Franklinga)
Registered Member Username: Franklinga Post Number: 3 Registered: 1-2005 Posted From: 24.181.76.209 Rating: N/A |
Decision time. I either have to rebuild the engine in my MC-9 or find a replacement engine. This 8V71 Turbo is currently available on eBay(Item number: 330206974875). Will this engine work as a direct substitute in place of my 8V71 without significant modification? Or maybe the better question would be; what modifications would have to be made to use this engine? We don't have a lot of time to use our Coach; maybe about 3000 miles per year if we're real lucky. A good used take-out would probably be fine, but I'm not having much luck finding a used engine with known history. We use our Coach just traveling around the southeast, so I really don't need the turbo. But a little extra horsepower would make me a little happier at times. From what I've seen, the cost of this engine seems reasonable, and I have an opportunity to get the engine hauled from Texas to Georgia at zero costs. | ||
| George M. Todd (George_mc6)
Registered Member Username: George_mc6 Post Number: 352 Registered: 8-2006 Posted From: 207.231.75.253 Rating: N/A |
Joe, Modifications, assuming the engines were originally ordered the same, might only entail the exhaust system, and the throttle linkage. You will probably need to take some parts off of your auxiliary drives, but no big deal. The whole exhaust now comes from the turbo up on top in the middle, instead of half out of each exhaust manifold. Depending upon injector sizes, a heating issue COULD arise. However, if your present engine has fairly large injectors now, and the turbo engine owner didn't really get carried away, you might actually be better off, as the engine will get better fuel mileage, at less than full throttle, and more of the heat will be rejected out the exhaust. So, measure and see if the turbo will fit in the engine room, and if you're sure about the engine, why not? THIS comes after looking at the pictures. I think its is a marine application, and I would do a WHOLE LOT of measuring before I jumped!!! I was expecting to see the turbo on top in the middle of the vee, but this location interferes with using the auxiliaries, they don't need air compressors and power steering pumps on boats! The seller does mention marine capability? A marine application can also be set up for 4 to 5 hundred hp, so watch out! G (Message edited by George Mc6 on January 26, 2008) | ||
| dick egler (Dickegler)
Registered Member Username: Dickegler Post Number: 29 Registered: 8-2005 Posted From: 66.82.9.107 Rating: N/A |
Hi Joe, I had one of these engines for a repower I didn't complete. It is a military version, standard rotation, about 400 hp(N75injectors?), as I recall. It powered an 80mm self propelled howitzer, or something like that. You might have to relocate the turbo to allow room for mounting the air compressor, and power steering pump,if equipped. Maybe move it to the other end. I wondered if you could simply invert the manifolds and plumb to the other end. The engine has the huge engine/hydraulic oil cooler mounted on the side opposite the starter. There is no oil filter. You could probably use your existing oil cooler and filter assembly. The small cylinders near the valve covers are parts of a cold weather starting system. One is a fuel pump, the other a coil to provide ignition. This flame heated the air plenums to start when cold. Hope this helps a little. Dick Egler | ||
| Jeff Cheek (Jeffsmagicbus)
Registered Member Username: Jeffsmagicbus Post Number: 26 Registered: 12-2006 Posted From: 205.188.117.73 Rating: N/A |
Hello! I've Got A DD Piston Liner Kit For An 8V71 If You Might Be Interested! My Drive Train Only Has 48K Miles Since A Complete Overhaul & I Don't Really Need It. Take Care, Jeff  | ||
| Chuck MC8 (Chuckmc8)
Registered Member Username: Chuckmc8 Post Number: 254 Registered: 5-2004 Posted From: 72.152.148.154 Rating: N/A |
Hey Joe, I did just that and am an hour away from you...........If you want to ride up you can see the 8V71TA thats installed and I can show you exactly whats involved.....and hey, you can drive my bus and check it out and see if thats the way you want to go. Mine has 370hp and runs great......HTH chuck | ||
| Ed Roelle (Ed_roelle)
Registered Member Username: Ed_roelle Post Number: 50 Registered: 3-2005 Posted From: 74.5.178.224 Rating: N/A |
You will have to buy additonal exhaust parts and move the turbo to fit MCI 9. You also will need to move you air compressor, power steering pump, oil cooler, and other components from your 8V71. You may have to remove the large gear cover (I did). But, as Chuck can confirm, it makes a nice package. You probably will want to install the 102 radiators and large fans (dependent on what year your MCI 9 is). I thought I could make the change in 6 weeks. I decided to strengthen the bus framework, install cruise, rebuild the cooler, rebuild the air compressor ... a few months of labor. Ed Roelle Flint, MI | ||
| Joe Franklin (Franklinga)
Registered Member Username: Franklinga Post Number: 4 Registered: 1-2005 Posted From: 66.189.246.185 Rating: N/A |
Thanks for all the information. I'll keep looking for a standard 8V71. |