Cat engine with volvo outdrive.

[Paul Bradshaw]

Hello and thanks for hosting such a welcoming and informative site. Straight to the point. Does anyone have any insight into what is required to mount a cat engine to a volvo outdrive?

 

[volvopaul]

Hello and thanks for hosting such a welcoming and informative site. Straight to the point. Does anyone have any insight into what is required to mount a cat engine to a volvo outdrive?

What model and hp is the engine ?

 

[Paul Bradshaw]

Hello, we think it is a 3208 220hp marine engine. We are replacing an AQAD30A with a broken crank. We want to increase the HP on this boat.

 

[oldgit]

Useful for VP to know which outdrive you are proposing to use and that CAT 3208 weighs 720 Kilos ?

 

[Portofino]

Would have thought the torque will just chew through any VP outdrive .

 

[scottie]

Not a good idea ��

 

[Paul Bradshaw]

Hello, outdrive is 290dp.

 

[RobWales]

VP AD41's which are circa 200hp run through a 290 with no problems.

 

[Divemaster1]

Torque characteristics of a 10.4L V8 running at WOT 2000 RPM is very different from a 3.6L straight six running at WOT 3900 RPM

Suspect the CAT will rip the drive to pieces ... and even if it works (once the RPM difference issue have been overcome) the additional weight (equivalent to another AQAD30), will not give the result I suspect the OP is looking for...

 

[burgundyben]

But surely the prop curve is what demands torque from the engine, so leave the prop alone and the leg won't be subjected to anything worse than before.

Except of course that Cat will run out of revs at 2200rpm which will see a very poor result in terms of speed.

 

[scottie]

A

But surely the prop curve is what demands torque from the engine, so leave the prop alone and the leg won't be subjected to anything worse than before.

Except of course that Cat will run out of revs at 2200rpm which will see a very poor result in terms of speed.

Don’t encourage him in any case he may need to drop the sump through the boats bottom to line it up !

 

[Portofino]

But surely the prop curve is what demands torque from the engine, so leave the prop alone and the leg won't be subjected to anything worse than before.

Except of course that Cat will run out of revs at 2200rpm which will see a very poor result in terms of speed.

Those prop demand curves are empirical and based on a steady state .
On acceleration say before the hump those props will suck huge wads of torque attempting to twist or transfer huge forces on anything that seperates the resistance ( props ) from the active going on inside the cylinders .
We know the engine components are man enough, gudgeon pin , con rods , crank , out put shaft , etc but then the DP 290 stuff ?? Hmm !
It will accelerate very fast .

 

[oldgit]

Sounds like and old boat if the crank has failed over time, the 290 will be old as well.
Be interesting to see the adaptor plate converting engine to outdrive, drive shaft to damper plate arrangement and small matter of spline numbers.
Like to know where the 200 kilos of lead ballast will be located.... in the bow ?

 

[Paul Bradshaw]

Thank-you all for taking the time. Greatly appreciated!