Mercruiser 4.5ltr inboard

[zippyzip]

Hi Guys, I want to fit a Mercruiser 4.5MPI in a classic wooden speedboat, but it has to be on a prop shaft and a P bracket. Does anyone know if this is possible? if so what gearbox will fit and bell housing etc. Also any ideas on seawater pump configurations?

 

[Bondo]

Ayuh,.... Welcome Aboard,.... There ain't no 4.5l Merc motors,..... 4.3l, yes,....

Donno what a P bracket is,....

You can rig a Merc motor to an Inboard drive, but you've gotta pick which driveline ya want,.....

'n sea water pumps can be had in many configurations,.....
Depends on what yer needin',....

 

[zippyzip]

Yes there is a 4.5ltr i have fitted a couple of them!! Click on the link!


https://www.mercurymarine.com/en/us/engines/inboard-and-sterndrive/mercruiser/45l/

 

[Scott Danforth]

Bondo, its the new V6 for 2015.

zippy, your best bet is contact Mercruiser directly

 

[zippyzip]

What do you mean by driveline? are you talking about the output angle of the gearbox?

 

[Fun Times]

Ayuh,.... Welcome Aboard,.... There ain't no 4.5l Merc motors,..... 4.3l, yes,...

There is now my friend ,https://www.mercurymarine.com/en/us/...ercruiser/45l/

This engine is so new that you may want to try Contacting MerCruiser Customer Assistance for other options that may be coming available such as sea water pumps that would fit the inboards. But looking around on Merc website some more it seems that this engine package will fit the bravo drives so that means you should be able to buy the engine with the sea water pump already installed on the engine from new.

https://www.mercurymarine.com/en/us/...specifications
https://www.mercurymarine.com/en/us/contact

Just noticed that there are two HP versions of this new engine, 200 HP and 250 HP. 200 only fits the Alpha drive and 250 HP fits Alpha and the bravos drives.

Here's the list of engine models so far,
1998+ MERCRUISER , 4.5L
For a parts catalog of this engine, you could search one of the model numbers online like this for example, http://www.crowleymarine.com/mercury-outboard/16591.cfm?mdl=QLI71Y

40450020A	ALPHA MPI
40450021A	ALPHA MPI
40450022A	ALPHA MPI
40450023A	ALPHA MPI
40450024A	ALPHA MPI
40450025A	ALPHA MPI
40450026A	ALPHA MPI
40450027A	ALPHA MPI
40450028A	ALPHA MPI
40450029A	ALPHA MPI
40450030A	ALPHA MPI
40450031A	ALPHA MPI
40450032A	ALPHA MPI
40450033A	ALPHA MPI
40450034A	ALPHA MPI
40450035A	ALPHA MPI
40450036A	ALPHA MPI
40450037A	ALPHA MPI
40450038A	ALPHA MPI
40450039A	ALPHA MPI
40450040A	ALPHA MPI
40450041A	ALPHA MPI
40450042A	ALPHA MPI
40450043A	ALPHA MPI
40450044A	BRAVO MPI
40450045A	BRAVO MPI
40450046A	BRAVO MPI
40450047A	BRAVO MPI
40450048A	BRAVO MPI
40450049A	BRAVO MPI
40450050A	BR DTS MPI
40450051A	BR DTS MPI
40450052A	BR DTS MPI
40450053A	BR DTS MPI
40450054A	BR DTS MPI
40450055A	BR DTS MPI
40450056A	BRAVO MPI
40450057A	BRAVO MPI
40450058A	BRAVO MPI
40450059A	BRAVO MPI
40450060A	BRAVO MPI
40450061A	BRAVO MPI
40450062A	BR DTS MPI
40450063A	BR DTS MPI
40450064A	BR DTS MPI
40450065A	BR DTS MPI
40450066A	BR DTS MPI
40450067A	BR DTS MPI
40450069A	ALPHA MPI
40450070A	ALPHA MPI
40450071A	BRAVO MPI
40450072A	BR DTS MPI
40450073A	ALPHA MPI
40450074A	ALPHA MPI
40450075A	BRAVO MPI
40450076A	BR DTS MPI
40450077A	BRAVO MPI
40450078A	BR DTS MPI
40450079A	BRAVO MPI
40450080A	BR DTS MPI
40450081A	BR DTS MPI
40450082A	BR DTS MPI

 

[zippyzip]

Funnily enough i am a Mercruiser dealer! But over here in the UK we just run them on outdrives, so i have very little knowledge of running them on a gearbox!

 

[zippyzip]

The UK importer says it cant be done but i cant see why we cant do it? Gearbox, bell housing and seawater pump, was hoping someone might have done it already!

 

[Fun Times]

The UK importer says it cant be done but i cant see why we cant do it? Gearbox, bell housing and seawater pump, was hoping someone might have done it already!

With an open mind, I'm sure you can do it.

Let us know how it turns out, good luck.

 

[Bondo]

Ayuh,..... My learnin' moment of the day,.....

Wonder what flywheel cover bolt pattern was used with this new Mercruiser motor,..??

Wonder whether they were smart enough to stick with the standard Chevy pattern,..??

If they Did,..... Buildin' an Inboard, oughta be a piece of cake, with off the shelf parts,......

 

[Bt Doctur]

i know the 4.3, 5.0, 5.7, 8.1 all share the same bolt pattern so with the proper inboard housing any inboard trans can fit

 

[Bondo]

i know the 4.3, 5.0, 5.7, 8.1 all share the same bolt pattern so with the proper inboard housing any inboard trans can fit

Ayuh,..... All the Chevy motor We play with use the same bolt pattern,.....

The BBCs have an extra hole top center, but still the same bolt pattern,...

 

[Scott Danforth]

If I remember, I will send an email to the designer that worked on the 4.5 to get the flywhee housing bolt pattern. He used to work for me in a prior life.

 

[Bondo]

If I remember,

Way Cool,....... here's alittle reminder,.....

 

[Scott Danforth]

Per Jose, its designed as a direct drop in replacement for the GM motors. So bolting to any trans adapter will be easy

 

[zippyzip]

What sort of gearboxes do you guys think will suit? as we need approx 2.6:1 ratio

 

[Bondo]

Per Jose, its designed as a direct drop in replacement for the GM motors. So bolting to any trans adapter will be easy

Ayuh,.... That's Good news, 'n a smart move on Merc's part,....