which would you pick 225 promax or 225x?

[Ajskennels]

looking to get input from you guys, which would you chose traditional 225 PM or the 225x for a Allison 2003?
i can't really find much info on the x or i wouldn't even ask

[Anthony Cruz]

I believe if you want to keep the motor in stock form the 225x is better, if you want to mod and go fast the promax is better.

[David]

I would buy the best motor I could afford and would not care X or earlier.

[mach351]

I would go with the Promax. The X motor was kinda a bastard short run motor (2 years?) and not that they won’t run well, it’s just that between o ring heads, funky injection, and a Motorola box, parts could be tough to come by. The Promax on the other hand has all the normal 2.4/2.5 stuff and parts are readily available. Just my opinion.

[Anthony Cruz]

Well said Mach!

[tux974]

1 more vote for a Promax.

[pkstv]

Promax ! Low matinance , reliability , lasts forever , rebuildable , plenty of parts available!

[David L]

Well guys, I have to toss in a different opinion on this. As a previous owner of the older gen Promax and a current owner of a 225X on my Prosport:

My vote is the X.

The X has a bullet proof oil injection design. Yea, one can remove it from the old style.

The X idles better

The X has better mid-range.

They both have the same top-end power

X has a simpler more reliable ignition system

X has the 60 amp external car type alternator. 40 amp for the older style

X has improved engine guardian protection modes

Parts availability example: The Throttle Position Sensor on the older style is over 500 hundred $

The X's TPS is similar across many Merc models and is under $200 and available.

The X has O-ring heads which is more reliable then gasket design.

jut my 02

[90 5.0]

Well guys, I have to toss in a different opinion on this. As a previous owner of the older gen Promax and a current owner of a 225X on my Prosport:

My vote is the X.

The X has a bullet proof oil injection design. Yea, one can remove it from the old style.

The X idles better

The X has better mid-range.

They both have the same top-end power

X has a simpler more reliable ignition system

X has the 60 amp external car type alternator. 40 amp for the older style

X has improved engine guardian protection modes

Parts availability example: The Throttle Position Sensor on the older style is over 500 hundred $

The X's TPS is similar across many Merc models and is under $200 and available.

The X has O-ring heads which is more reliable then gasket design.

jut my 02

How are you judging the gasket head reliability? I’ve never had a gasket related failure on any of my outboards and I’ve had a lot and my dad has also. From the time I was born, till today not a single motor either of us has owned has had a failure related to gasketed head design.

Thats 42 years and counting. Pretty damn reliable in my book.

[Ajskennels]

I've never had a gasket failure either, but i have on a o-ring head, i personally don't like the o-ring style heads i think the o-ring style lets the top of the cylinder move around to much, i know in theory you have the surface of the head contacting the sleeve/holder but i still think it moves around especially if the head isn't dead nuts flat