Detriot 8.2 turbo charged 250 hp

[charlesosgood]

Looking at a 35 foot Duffy with this engine- 1988 with only 1000 hrs. From what I've read here, the opinions range from attaching an anchor chain to it to it being a reliable, efficient engine. It supposedly is know for low fuel usage.

Thanks.

 

[captainlarry84]

The Detroit 8.2 was not a home run. Mid of the road power at best. At 250 HP in a 35 Duffy I hope you are not in a rush to go anywhere. I would EST the max cursing speed at 10 knots & WOT at 13-14 knots.

If you move forward on this motor. I would strongly recommend that you change the anti-freeze & clean out the raw water side with a cleaner such as Rydlime.
The 8.2 is one motor that you do not want to run warm of overheat as that would be its kiss of death. 8.2’s have Siamese cylinders on the 2-3 & 6-7 cylinders. With no water jacket in that area you can understand why the cooling system must be up to grade.

If you like the boat & can live with the speed I would not let the fact that the motor is a 8.2 stop you from moving forward. If you do deicide to move on your seatest make sure you give it a good WOT run & make sure you have a photo tach to confirm the RPMs. As far a fuel goes how much fuel can a 250 HP diesel burn. I would EST that this boat gets 1.5 to 1.8 MPG at a soft cursing speed.

Lastly look to future on this boat. If she is a diamond and you plan on being in for the long haul. Make sure she holds 200 gallons of fuel. Check the shaft size; these boats are heavy with long shafts so I would like to see a 1.75 in this boat. She is most likely also wet keeled. With a wet keel it is an easy switch to upgrade the shaft to any size needed for a repower or even a convert to the better system, a wet tube.

The 35 Duffy at any vintage is a keeper.

 

[paddyboy]

8.2 Detroit

I had a 8.2 Detroit in a 30' young brothers. Motor ran well, was very good on fuel. As capt Larry alluded to, the weakness of these motors is the cooling system. I burnt two heads in the 4-5 years I had it. Expensive to fix, parts are long out of manufacture. In addition these are heavy pieces of iron, repowered the boat with a 5.9 cummins and lightened the boat by probably 500 lbs. also 1000 hrs on a twenty plus year old boat is a bit disconcerting.

 

[charlesosgood]

I had a 8.2 Detroit in a 30' young brothers. Motor ran well, was very good on fuel. As capt Larry alluded to, the weakness of these motors is the cooling system. I burnt two heads in the 4-5 years I had it. Expensive to fix, parts are long out of manufacture. In addition these are heavy pieces of iron, repowered the boat with a 5.9 cummins and lightened the boat by probably 500 lbs. also 1000 hrs on a twenty plus year old boat is a bit disconcerting.

I am curiious about your last statement- are you saying that there are likely more hours on the boat or are you saying that if has only 1000 hours over that time period that can be trouble?

Thanks.

 

[eyschulman]

I think the ? about 1000 hrs in 20 years is pointing to fact that it was not used much if this is original motor. Marine motors have to deal with a thing called marine age it has to do with time spent in a salt water envirnment. While the motor is sitting there it is being eaten away. Not beieing used much with salt water in it is worse than being used. A regullarly used motor gets to cook off internal moisture and gets its oil bath.

 

[paddyboy]

In regards to the low engine hours, 1000 hours on a 20+ year old boat I would find a bit disconcerting. If indeed all ancillary systems are vintage, replacement of hoses, belts, impellers would be advisable. Closely look at the wiring for green fuzz and questionable connections. I wouldn't disqualify a boat for having light usage, just be aware that a boat that sits for long periods of time develop issues that will need to be addressed.