Force 120 hp swap for 4 cycly engine

[sheriff]

I have a 1990 Maxum 2100 (21 ft) cuddy cabin with a Force 120 hp, 4 cyl, 2 stroke engine and I want to change to a 4 cycle engine. Is there a 4 cycle engine that will fit onto the L drive in place of the 2 stroke engine ? OR<br /><br />Can a complete Chevy 4 cylinder and merc out drive be placed into this boat ?

 

[roscoe]

Re: Force 120 hp swap for 4 cycly engine

Doubt you will get anything to fit the l-drive.<br /><br />You should be able to fit another engine and outdrive, but not without doing some fabricating on the transom. A good boat shop should be able to do it.<br /><br />Why a Chevy 4 cyl?<br />Why not a 4.3 Liter v-6?<br />I'm sure the extra hp would be needed on a boat of that size.<br /><br />If you're going to spend the money, do it right.

 

[WillyBWright]

Re: Force 120 hp swap for 4 cycly engine

There is NO room under there for a Real motor, and the transom may not be built to hold anything but an L. The bottom of the hull back there is Way different, too. You're Stuck With It, Force powerhead and all! A 5-cylinder 150Hp Force powerhead might be an option (if you can find one). Not sure the drive would hold-up.

 

[DHPMARINE]

Re: Force 120 hp swap for 4 cycly engine

Best bet is enjoy what you have,then sell and get what you want (next).4stk outboard powerheads are WAY different.<br /><br />DHP

 

[roscoe]

Re: Force 120 hp swap for 4 cycly engine

I didn't say it would be cheap, easy, wise, convenient, or practical, but if there's a will, there's a way.<br /><br />Is this the boat you have?<br />This one has a 5L v-8<br /> http://www.botentekoop.nl/speed_en_sportboten/408275/Maxum_2100_1990.html <br /><br /><br />And this one has a 4.3<br /> http://owensoundmarina.com/used/90maxum2100scr.html <br /><br />And this one is just cute !<br /> http://drag.race-cars.com/carsales/chevy/1099823784/1099823784ss.htm

 

[sheriff]

Re: Force 120 hp swap for 4 cycly engine

Originally posted by roscoe:<br /> I didn't say it would be cheap, easy, wise, convenient, or practical, but if there's a will, there's a way.<br /><br />Is this the boat you have?<br />This one has a 5L v-8<br /> http://www.botentekoop.nl/speed_en_sportboten/408275/Maxum_2100_1990.html <br /><br /><br />And this one has a 4.3<br /> http://owensoundmarina.com/used/90maxum2100scr.html <br /><br />And this one is just cute !<br /> http://drag.race-cars.com/carsales/chevy/1099823784/1099823784ss.htm

 

[sheriff]

Re: Force 120 hp swap for 4 cycly engine

Yes, example one and two show the boat that I have with the exception of the 4 stroke engines. Do you know of anyone that has completed a conversion from 2 to 4 stroke engines ?

 

[WillyBWright]

Re: Force 120 hp swap for 4 cycly engine

Use the motor from the third pic in your boat. <br /><br />Roscoe, I had a friend in HS that kinda did that to a Pinto. Bigblock Chev motor and GM drivetrain with the axles shortened. I moved before he finished it. Had to be scarey! <br /><br />Back to the subject at hand ... I really don't think the MerCruiser thing is an option. Different hulls. Adapting a 4-st OB powerhead might be an option. You'd need some form of adapter made to match the mounting surfaces. Then a stub shaft connecting the drive to the crankshaft. Doable? I s'pose. Practical if you have to pay for it? Nope.<br /><br />We should be polite and ask why you ask. Are you having problems, or just lacking power? The Force 150 might be the easiest option (except for locating one). For the most part, I'd think they'd mount right up. Just keep in mind that they used 3- and 4-cylinder powerheads on those drives. 5 might be too much for the drivetrain. I dunno. You'd have to use certain parts from your powerhead because they're considered inboards and are more spark resistant than outboard models.

 

[Scaaty]

Re: Force 120 hp swap for 4 cycly engine

Originally posted by WillyBWright:<br /> a Pinto. Bigblock Chev motor and GM drivetrain with the axles shortened. I moved before he finished it. Had to be scarey!

Think it found its way to Olympia WA. See one sitting (just gorgeous from the rear) going out to my sisters house. Too Cool

 

[sheriff]

Re: Force 120 hp swap for 4 cycly engine

Originally posted by Robby6950:<br />

Originally posted by WillyBWright:<br /> a Pinto. Bigblock Chev motor and GM drivetrain with the axles shortened. I moved before he finished it. Had to be scarey!

Think it found its way to Olympia WA. See one sitting (just gorgeous from the rear) going out to my sisters house. Too Cool

Thanks for asking. <br />First the State of Ca. is slowly outlawing 2 stroke engines on various lakes. Second, better gas mileage with 4 stroke engines.<br /><br /> Thanks--Scott