1989 275 johnson

[gofastsandman]

Originally Posted by workinpr0gress

I think there was a very short run of those monster Mercs, 3.4 liter. You will burn fuel like a space shuttle, even for an old 2smoke. Same deal with the old thirsty v8 omc's.

You have to keep your spread skippin` and diving. Far from optimal. I burned 35 gals Sunday.

Nature of the old carbed motors. That`s a single 150.

The V8 was a beast. Monty Racing got sick numbers from that block.

Cheers,
GFS

[ScottM]

Didn't the OMC V8s have an oil starvation issue in the top 2 cylinders, hence many of them lived a short life? Perhaps that was with VRO so maybe if you bypass that and premix it may not be an issue???

[eggsuckindog]

I had one on a 23 Sceptre, weight was not an issue on that hull, as 2 2.5 mercs weigh over 800 or 2 inline 150's that I replaced went 600.

Yes it is basically 2 140's, so parts are readily available and easy to work on except carb sync.

Yes it will eat some gas about what 2 140's would take but not that bad UNLESS - you start to feed it. I ran mine once with the airbox off and it is amazing how much fuel goes into 8 carbs but the sound you will never forget.

That Sceptre would almost literally fly - I had a tach hole to fill so stuck a 55mph speedo in = worthless - would go all the way around to the peg at zero

Never had any little issues with mine at all, if its cheap enough and has compression you can buy alot of gas as thay say

[george90]

i think i mit have to get it. what would be good compression on these motors. as long as its better then twin 140s witch i wanted on gas and has great power im in. the guy im buying it from has a couple of them so i mit just pick up two or three for parts if needed

[Bigshrimpin]

my favorite omc v8 videos
http://www.youtube.com/watch?v=RI9zRXmowO8
http://www.youtube.com/watch?v=3yr7F2uSOU8

[george90]

this one thing i dont want to happen. because im going to be crossing alot http://youtu.be/9ANnmOAB8js

[eggsuckindog]

I think don't think it was a looper so 115 should be good - if it is a looper they run less but consistence is good - extra parts are always good