Help identifying v4 johnson

[Eddie1920]

The tag on the transom bracket is gone. Previous owner says its 140hp

 

[Eddie1920]

Actually someone told me its got 140hp carbs on it and bubble back exhaust on it But the hood says 115 so I dont know what it is and I dont know the year. That's what I'm mainly trying to figure out is year and if its a 115 with upgrades or if its a 140 with 115 decals, i think its 90 degrees cross flow. The cylinders are off set one bank is higher then opposite bank.

 

[Eddie1920]

 

[Eddie1920]

anyone know?

 

[Chris1956]

It is certainly a 90* V4 motor. Does it have removeable transfer port covers? If so, it is a crossflow. If not, it may be a looper.

You could search on the block part number. If no action on the web, you could look on crowleymarine at special V4 engines for a match on the block part number. Special motors do not have oil injection, so that can narrow it down a bit.

I am not an expert, but it does not look like a bubbleback exhaust. Someone here will know for sure, I would think.

 

[racerone]

It is a crossflow.---It has bypass covers.----It has VRO.-----I doubt the powerhead is original to the motor.

 

[Eddie1920]

it does have a bubble back exhaust, it does have VRO, but, been premixing it. the max advance says 28 degree i think its 1984 115, but i aint sure is there any numbers i can look at and use somewhere other then p/n?

 

[jimmbo]

A 1984 140 would have the Bubble Back Tuner, a 1984 115 would have a Flat Exhaust Cover, a post 84 115(prop Rated) would have a Bubble Back Exhaust Tuner. It very might very well have the same Carbs as the pre 85 140(crank rated). Being that it has a VRO places it post 83.
Odd that the Block has no White Paint on it, and the Heads are peeling either White or Gray
Is there a Model Number on a Plate on the Transom Bracket?

 

[racerone]

A 1984 model 115 HP did not come with the bubble ( tuned ) exhaust.

 

[Eddie1920]

A 1984 140 would have the Bubble Back Tuner, a 1984 115 would have a Flat Exhaust Cover, a post 84 115(prop Rated) would have a Bubble Back Exhaust Tuner. It very might very well have the same Carbs as the pre 85 140(crank rated). Being that it has a VRO places it post 83.
Odd that the Block has no White Paint on it, and the Heads are peeling either White or Gray
Is there a Model Number on a Plate on the Transom Bracket?

The model plate is missing and its been painted, someone may have painted the whole thing and put new decals on it the paint in uniform through out the exterior of it.

 

[jimmbo]

Looking at the Pics again, the motor has had at the least the Heads off, as the Gaskets don't have any Paint on them.
In the one pic, where the Convex Disc with the Serial Number would be, somebody stamped 020 06 07. I will guess that might mean 0.020 Overbore, and June 07
The Decals on the Cowl are from the 90s, on top of another Decal.
Being that it has the Bubble Back Tuner and VRO, I would say it is likely a 1984 140, or a post 84 110, 112, 115.

I won't even brush the possibility of a pre 85 115hp, even a 90 hp, being Hopped Up into a 140.

 

[Eddie1920]

Would all the fuel line be 3/8 if its 140? Currently all the fuel line on it are 5/16

 

[jimmbo]

I recall that the 3/8" Line was introduced for the V6s back in late 75. The V6 Engines were 50% larger than the V4s. Looking at the Parts Lists, the Crossflow V4s all used 5/16" Hoses/Lines

 

[Eddie1920]

Looking at the Pics again, the motor has had at the least the Heads off, as the Gaskets don't have any Paint on them.
In the one pic, where the Convex Disc with the Serial Number would be, somebody stamped 020 06 07. I will guess that might mean 0.020 Overbore, and June 07
The Decals on the Cowl are from the 90s, on top of another Decal.
Being that it has the Bubble Back Tuner and VRO, I would say it is likely a 1984 140, or a post 84 110, 112, 115.

I won't even brush the possibility of a pre 85 115hp, even a 90 hp, being Hopped Up into a 140.

OK so if its a 1984 its likely a 140hp. and if its 1985 or newer its could be a 115hp, am i understanding that right? my main concern is the full advance timing, the decal on the intake says 28° but it could be different depending on which year it actually is, my book 140, 1985 is 22° 1986 and on says 18° alot less then 1984

 

[jimmbo]

The Chart you show, just shows 140, and doesn't separate the Crossflows from the Loopers, except by yr, and there is Difference in how much Timing is allowed

In 1985, a completely different Motor became the 140, it was a larger Loop Charged Design. 85 was also the first yr OMC started to Prop Rate their Engines.

As for all the Variances in Max Advance, in the 70s and into the 80s, OMC appeared to be changing the Cylinder Heads and thus the Compression on a lot of Motors, every Model Yr. Lower Compression Heads tolerated more Timing Advance. Shape of the Combustion Chamber also affected how fast the Fuel Burned too. WOT Fuel Calibration also factored in, as a Richer Mixture provided some Cooling, and more timing could be used. Changes to the Exhaust Tuning, also affected how much Air and Fuel were in the Cylinder to be compressed. As the 70s and 80s progressed, Gasoline Formulations also changed, that too affect the Max Timing.

However, I know the 1973 135 had Cylinder Heads that were offered the Highest Compression on the V4s, yet had less Timing Advance than the 75-76, which had slightly less compression

Unless you are the original Owner of a Motor, and know its History, a used Engine could be a bunch of cobbled up Parts, even the cover of the Airbox, where the Sticker stating the Max Advance, could possibly not be the One that belongs to that Motor...

 

[racerone]

There is a crossflow 140 and a big looper V-4 model 140,-----Do NOT confuse ignition timing between the 2 models.