Volvo D4-260 performance report/ 1968 FB

[Bruce]

"Time Machine" is done and delivered to a very happy owner.

Some comments on the D4.
1. Was lead to believe they were really quiet. They are not. Typical diesel sound.
2. Mounts have very "flexable" rubber and I found out why. At idle they shake and at 1000 they some what thrash in my opinion. At 1100 they smooth out like butter.
3. Acceleration is seamless and smooth and so is shifting for all electronic controls.

Setup:
31' FB, 1968.
Volvo D4-260hp, 2.0:1 gear.
20x24 DQX 4 blade medium cup.
100 gallons of fuel, full water, interior loaded as used, 300lbs lite of engine boxes and side deck(getting fish box made).
Clean bottom
Temp 70, wind 3 to 5 knts.
2 persons
GPS measured speed.

RPM Speed knts Fuel burn
1000 5 .6
1500 7 1.6
2000 11.5 3.5
2600 18.5 6.1
3000 23 8.2
3200 24 9.4
3400 27 11.0
3500 (wot) 28.5 11.5

Installation took some engineering because of the short distance between front and rear mounts to make it look clean.
Also because they are big 4 cylinders.

Nextgen 3.5 outboard of port engine is able to use full sound shield and it is removable in place with access, albeit not the best to outside of port engine.

I used short hi hp mufflers with surge tubes. Bottom of turbo outlet is 14" above water line.

Engine angle is about 8 degrees.

When the deck is back in and the engine boxes on I will take some DB readings. Engine boxes are non insulated.

Fuel tank has 264 gallon capacity.

Wed "Blue Falcon" will come out for its Yanmar repower.
Its a 31 where the bridge and house were removed and a cuddy cabin and center console were installed.
Will get a new Glass Tech deck and engine boxes also.

[Bruce]

rpm speed and fuel burn jammed together when posted.

[craig mac]

One question on the fuel burn---is that per engine?

[RussP]

Bruce, Im sure your happy to have it out of the barn. This was another first class repower and those numbers look great.

RussP

[Bruce]

Russ,
The shop looks hugh inside, but not for long.

[Dave Kosh R.I.P.]

Good work Bruce ! Dave K

[craig mac]

bruce, any chance to get some poics of the "Blue Falcon" -project sounds interesting

[Bruce]

Sure.
When it comes out I'll get some shots.

[Rawleigh]

Bruce: Was that fuel burn combined or per side?