Taking a second look at omc

[powerabout]

Oh i know about stator why and how i did it on purpose just to see how fast it would fry. ..you know fun stuff to try and see.
Wasnt sure about regulator and just grounding it... Wasnt sure if it would cause other electrical problems ?

can cause the charge coils to fail due to all that heat its applying to the stator, thats been true since the 70's

[CVX20SPRINT]

IDK.I'm still leaning toward cooling.Bike reg/recs do the exact same thing and hardly ever fail.But they are aircooled as well.The old 4 cylinder Wings put out 50-60 vAC at idle on 3 circuits and the regs had no issue getting rid of the extra.Just thinking out loud.

[powerabout]

IDK.I'm still leaning toward cooling.Bike reg/recs do the exact same thing and hardly ever fail.But they are aircooled as well.The old 4 cylinder Wings put out 50-60 vAC at idle on 3 circuits and the regs had no issue getting rid of the extra.Just thinking out loud.

the heat comes from dissipating the current not voltage, so its just an issue of how much current can the stator produce, as they got bigger over the years they had to go water cooled

[Instigator]

3.0 Mercs are near/same weight as 3.0 loopers.

2.5 hot rod motors have trim unit in boat, thus lighter gross weight but net, not much.
Plus, read John Tigers story in Bass and Walleye mag where he weighed all the motors and compare to advertised weights.
Even he was shocked at the 2.5’s.
I think, +20 lbs!

The OMC 225 HO/250 Ocean Pros are cheater motors?
First I’ve heard that.

The two I sold you are identical to the 2 I bought new in ‘99 and the several I’ve had since.
There are 2 differences between them and a 225 looper, and 2 differences only.
Their exhaust ports are higher and the exhaust bleed ports are smaller.
That’s it.

They made 254 HP’s at the crank and 247 at the prop.
225 Pro Max’s are near identical.

While in Fla, I built one for a customer.
It did have the larger 200/225 bleed ports, meaning slightly less compression.

I tuned/broke it in on the STV I screwed up and had it at a run in the Keys and ran a friend that had a 225 Pro Max on a Mirage.
I had a 30” RE3 and he had a 26/28 ET.
We raced 8 or 9 times.

From a roll, from a dig, top end etc.
I think I beat him all but once.
W/closed exhaust and an air box and VRO.

There were 3 eras of intakes on those motors.
The ones that came on the screwed up STV were the worst, so were the carbs.

Lots of info out there on loopers.
Not all is accurate.

[LaveyT]

The OMC motors can be very reliable. I have a 2000 225H.O. that I got 21 years out of basically trouble free. I have no idea how many hours on this motor. Rock Stock.
After 21 years you may have a piston ring locating pin back out
Solid motor mounts and Velocity stacks are also being manufactured again I have heard.

[mrichartz]

Actually Sam jenkins on here has been making the stacks and the solid mounts..
Just happy i have my land and sea on my motors already. And a set.

[CVX20SPRINT]

If that was the case then why were the water cooled ones so short lived on OMC and Merc?

[CVX20SPRINT]

the heat comes from dissipating the current not voltage, so its just an issue of how much current can the stator produce, as they got bigger over the years they had to go water cooled

If that were the case why were the water cooled ones so short lived?I thought OMC ans Merc only used them for a couple of years.

[89LASER]

I had a 86 200xp. We found the regulator was getting hot and burning up. OMC had a Y on their engines pisser, (tell tale) right before exiting the lower cowling. We took off that Y and ran the hose off the top of the block right out the lower cowling, so the engine had 2 pisser tubes exiting. After we did that, I never had a problem with the regulator again. I don't know if the water was cavitating on the regulator or was having and air pocket at the top of the block.

[Instigator]

Actually, The guy in the post above you has been making them for Sam.

I know this because I took out a $2500 loan to start making the velocity stacks 20 years ago and then my friend on the post above you decided to do it Himself at the machine shop he worked at.

So much for friendship.

Actually Sam jenkins on here has been making the stacks and the solid mounts..
Just happy i have my land and sea on my motors already. And a set.

[mrichartz]

Actually, The guy in the post above you has been making them for Sam.

I know this because I took out a $2500 loan to start making the velocity stacks 20 years ago and then my friend on the post above you decided to do it Himself at the machine shop he worked at.

So much for friendship.

Huh.. interesting but doesn't mention anything?

[mr fun]

GT 200 heads , what am I looking for to be sure they are the real deal ?

[mr fun]

Mricharts , what fuel do you run with 152 lbs compression ?

[Instigator]

I’m old and don’t remember what I used to.
They have a pt# cast into their face, and used to be burned in my brain.

3314943???

Difference is in combustion chamber.
All other V-6 looper heads transition from deck surface to chamber via a radius.

The GT (most of us call them 2.7 heads) have a taper instead.

As far as compression, depends what you bolt them on.
Typically +10 - 15 psi.

Would make a typical 3.0 looper 115 - 130 PSI.

GT 200 heads , what am I looking for to be sure they are the real deal ?

[mrichartz]

Mricharts , what fuel do you run with 152 lbs compression ?

Always fresh gas 93 w some octane booster so its 96/97 im probably fine w fresh gas 93 octane but rather safe than sorry.
150 is pushing it on just 93 and boat isnt really light.
Use either homemade or boostane..

Max WOT timing is set at 16 not stock 18
And running 80d jets (because of heads and other stuff)
Heads you add 2 sizes up on jets

If you do heads you will be fine with just rejetting and good gas maybe make some pullovers... unless you start doing more to up the comp like he said youll be below 135 depending on what you're putting them on..
What motor and year motor are you doing?

And the part # cast in the 2.7 heads is 331490..and think 331490-3 like instigator said. None of mine or any ive had more than 331490 but have seen some with that last # but

Pics are 2.7 heads you can see the difference





Stock..88-92 open deck.. im sure you know what they look like but here