Prevost engine swap possible?

DonHutchins wrote:
Thanks Mark,

I've emailed him...

Don

Mr. Don,

Any updates? What did Brian suggest?

MM.

Mike Hohnstein wrote:
Major problem with 2 strokes, as with 3208 Cats is the emission regs knocked them out of the market 20+ years ago, it's getting pretty difficult to find a tech who can deal with them considering the fact that Detroit and Caterpillar don't support them service wise.
That being said, mechanical engines are less likely to leave one marooned, as the Dedecs are obsolete and as stated above, not supported.

Pablum. Off the top of my head, Cat still rebuilds 3208s!

DonHutchins wrote:
I'm looking at a used Prevost that's a beautiful unit in nice condition, but it's got the old DD 8v92 motor, which I'm really leery of. It's got a rep as a dripper and fuel guzzler. What are the chances it could be swapped for the newer DD Series 60 motor? I know this is off-the-wall, but I really do like this unit and might go for it if this is do-able...

Don Hutchins
Kingston WA

I'm sure it's possible...will probably cost between $20,000 and $40,000 to do.

The 8V92TA is fine...I suspect it is a "Silver 92", with the leakage problems solved. In a Prevost, I would expect a pretty high power rating, probably 450HP or better.

Don,
You might join www.prevostcommunity.com, www.prevostownersgroup.com, and or www.prevostgurus.com. Those boards are directed to Prevost and potential owners of Prevost. A wealth of information and knowledge on those boards.

Reese

We have lots of them.
The guy who bought my boat
had a complete rebuild including magna flux
on a 8-71 last year.

if it is n good shape the 8v92 will give you good service. when they were a common engine in trucks a quick way I would use to check the condition was to start the engine cold after sitting over night and watch the smoke out of the exhaust at idle if any white smoke clears up within 30 to 45 seconds then the rings are probably ok take a infrared thermometer and check the exhaust temp at the manifold ports if the white smoke persists the port that is colder will be the smoker these engines with high mileage are bad about breaking the top ring
also check the amount of oil coming out of the air box drains (slobber tubes)if it drips it is somewhat normal if it runs out probably piston pin retainers or piston crown to skirt seals are leaking, major repairs. also make sure there is no coolant in the oil quick check with the engine hot stick your finger up the breather tube if it comes out foamy and watery major repairs. 92 series engine main bearings don't like anti freeze. most common cause would be the head gaskets or the liner seals. yes finding a tech that even knows what a 71 or 92 series Detroit is let alone how to fix one is getting more difficult every day.

good luck with it

Major problem with 2 strokes, as with 3208 Cats is the emission regs knocked them out of the market 20+ years ago, it's getting pretty difficult to find a tech who can deal with them considering the fact that Detroit and Caterpillar don't support them service wise.
That being said, mechanical engines are less likely to leave one marooned, as the Dedecs are obsolete and as stated above, not supported.

I ran many Detroit 2 strokes over the years. The last one i had we up tuned it. We changed it up from 80 or 90 injectors to 110 injectors and a Detroit v12 pump. They are interchangeable. The cost i can't quite remember but was not real expensive. That gave out upwards of 500 HP and actually improved the fuel mileage. Yes they use a little oil but the harder you drive them the better they ran. They are noisier than most engines but are very cheap in comparison to maintain or rebuild.
That truck that I had that engine in was pulling 63000 kg loads and was hard to pass. The Cats and Cummins of the day could not touch it.

The engine swap you suggest would be very expensive to do. I changed on truck from a 8v71 to a Cummins and the costs went through the roof when you started having to replace radiator and all hoses including hydraulics fuel lines and wiring and it goes on and on.

Yes the 2 cycle GM's love the fuel but unless you are putting 100K miles/year on it... you can't be serious about swapping. Because of the higher pressure on the crankcase you get more oil out the slobber tube/crankcase vent. You can make a catch bucket out of a gallon jug with steel wool in it to catch the oil and yes you could even recycle it. I have a 8v71 in a dump truck that's very dry (agree valve cover gasket/alignment) and they are still fairly inexpensive and easy to rebuild... used to be $100/hole. A complete OH kit for a 8v92 is only $3000.

How many miles on it?

Love the 8V92 in our 1990 Bluebird. 475 hp, goes right down the road. Buy the two stroke, love it!