Allison 14R with OMC V4: too much motor?

[mxz]

Would a 90hp OMC V4 be too much motor for an Allison 14R? Specs show the 90hp to be 300lbs. What size motor were these boats designed for?

[nitro_rat]

Probably a 75 Stinger, that’s what I remember seeing on them. If your going to hang a V4 go for the gold and do a 140, nothing’s worse than an overweight and underpowered transom!!!

[FMP]

What's the v4 looper weight again 320?

[racervboat]

Got a 16ft Allison with a v-4 and going to put a v-6 merc on it ? others on here put v-6 mercs on there 15ft Allison so you should be ok.

[nitro_rat]

I’m not sure, but I know the looper is significantly heavier than a crossflow. I’m talking crossflows here and that’s what I assumed the op was talking about as they are right around 300 lbs.

[nitro_rat]

Got a 16ft Allison with a v-4 and going to put a v-6 merc on it ? others on here put v-6 mercs on there 15ft Allison so you should be ok.

I think a V6 is probably borderline on a 15 footer. A 14 could probably float a crossflow though...

[racervboat]

around 275lbs

[mxz]

Motor is a late 80's crossflow 90hp. Specs show it at 300lbs. The 140hp shows way heavier at 365lbs!

[nitro_rat]

That 140 you’re looking at will be a looper I bet...

[largecar91]

Great motor for that boat. A lot of people years ago ran inline 6's and v-4's on 14' and 15' Allisons, Checkmates, etc

[mxz]

I am not looking at a 140, only mentioned the extra weight of a 140 since you mentioned to go all out with a 140 instead of a 90hp.

[nitro_rat]

A crossflow 140 is the same weight as a crossflow 90. It’s a different motor than the 140 looper you’re looking at...

[kim cleckler]

back in the 70;s we ran a 14 with a kc-13 on it... ran like hell

[Li'l Toy]

Ran a 90 hp V4 on my 14" Vandal for years--no issue. When I bought it it had a 135 in line 6. Might be an insurance issue if you intend to insure it--check the hull plate if it has one, or I bet the info can be gotten from Allison. If I had it to do again, and one was available for my price, I would have gone with a 140. If/when the rebuild ever gets done, it will have a V6.

[71V153]

Yes. Loopers are heavier. 140 Xflow of that vintage is reportedly 9 lbs heavier than the 90. Go for it!

[nitro_rat]

Yes. Loopers are heavier. 140 Xflow of that vintage is reportedly 9 lbs heavier than the 90. Go for it!

I think the weight difference is bubbleback vs flatback. All the late crossflows were bubbles I think, weight should be the same.

140 crossflow is something like ‘78-‘85. It’s probably 9 lbs heavier than a 90 of that vintage.

[71V153]

I think the weight difference is bubbleback vs flatback. All the late crossflows were bubbles I think, weight should be the same.

140 crossflow is something like ‘78-‘85. It’s probably 9 lbs heavier than a 90 of that vintage.Close. '77 was the first year for the 140. The 85/90 hp was never a bubble butt. In '85 when they went to prop rated hp. The 140 Xflow was detuned and became the 115. It was replaced by a 140 Loopner.

[nitro_rat]

Close. '77 was the first year for the 140. The 85/90 hp was never a bubble butt. In '85 when they went to prop rated hp. The 140 Xflow was detuned and became the 115. It was replaced by a 140 Loopner.

I knew that. 77 has the one year only gold plated mysterious best of the best tuna’...I’m pretty sure a friend of mine has an 88SPL with the bubble, I figured they all went that way towards the end...

[71V153]

Well, not gold plated ...

[loop]

if you only want 90hp do it with a 3cyl Yamaha. Lighter weight and smaller gearcase than a v4 plus some were available from the factory in 15"versions.
Any v4 crossflow would be the next lightest choice and more power potential
it will be a fun,fast boat whichever way you decide
I would also suggest string steering

[Da Bull]

If you gonna go with a V-4 then do a Yamaha looper. Same weight as X-flow OMC. Mr. Demeanor.

[Mr. Demeanor]

298 lbs.
408624

[FMP]

Still running strong? Any more mods?

[nitro_rat]

if you only want 90hp do it with a 3cyl Yamaha

The little 3 cyl Merc 90’s are nice too but not as much hop up potential as the Yammy. About 265 lbs...

[kasshark]

The little 3 cyl Merc 90’s are nice too but not as much hop up potential as the Yammy. About 265 lbs...
what year allison? there were many different models.

[Mr. Demeanor]

Still running strong? Any more mods?

No issues at all. Havent used it much lately. NO changes. 101 is fast enough.

[Mr. Demeanor]

Get a small Yamaha. Nobody wants a small Johnson :eek: :D

[71V153]

Get a small Yamaha. Nobody wants a small Johnson :eek: :DThat's why I have a small Evinrude ...

[FMP]

Hehe
335lbs, 20"

[checkmate45]

Theres a guy by my cottage whos got a 14 ally with v4 on it. Seems to handle the motor great, boat looks like a blast

[largecar91]

Put a SST60 or 650Xs on it .Lightweight, and around 90+ hp.

[99fxst99]

Ran a 14 with a 150 in line. Bat out of hell in a straight line, couldn’t turn it in a 10 acre field. A ton of fun, though ��