School me on OMC V8 Outboards

[Chaz]

I think this one (V-6) went on Gordons Orange Action or his QuarterShot ...

[Chaz]

This was a 15" mid for a guy in Miami. He made the billet yellow mounts and black lower unit adapter.







The V-8's had a real small water pick up tube. I made this adapter for a 1" tube. It used an O-ring to seal it. The mock up piece was molly but the final piece was 316 stainless.

[racer]

Most have no idea how much time is involved to port one of these engines. Sure you can do a quick clean up but a real port job takes a lot of time and effort. Building a 350 hp V8 is not bad but as power goes up the effort and time involved multiplies.

[CUDA]

When we lived over by him I’d go have lunch with him and Chaz once a month and then go snoop through a through his shop.

I always joked that he patted me down for cameras before letting him in though :-)

I think he may be closer to 40 K for a full race V8 though.

When we first moved down there that time he was so slow that he worked part time at the airport to help keep the doors open.

And then he helped some guys start winning with his loopers and his business exploded, and he may be set for the rest of his life from what I see!

When I said $8,500. that is just porting a bare block, nothing else

a la carte, one step of many.

[James45157]

when i said $8,500. That is just porting a bare block, nothing else

a la carte, one step of many.

is that a mercury gear case

[CUDA]

No that's just cutting block open to grind aluminum and steel sleeve to make the intake ports larger, then welding it back together. back into block, I've never saw anyone do what he does, cutting the block open to get inside to do modifications. side area behind the ports wide open,

I really know very little of what he does in there, call him if you want to know. He has not built me anything in 20 some years, I run Mercury's

He is porting the block and new pistons of a 90 hp Yamaha 2 stroke for me over the winter, when he has nothing else to do

He stays busy during race season with big OMC's , He races a V-6 from the 90's and wins a lot.

There is a Gentleman on this board who took him a 130 V-4 Yamaha, He claims almost 200hp from that motor now

That little V 4 on a 13 Biel boat broke 101 MPH, with a BIG fellow driving.

https://youtu.be/vs13AmvP4hQ

[FUJIMO]

[Chaz]

Worlds shortest, lightest mid-section ..

[WaterZebra]

Worlds shortest, lightest mid-section ..

LOL. Mercury started using tube construction on their Verado and V8 mids. Promo guy said it was their version of Ducati engineering.

[NoLimits]

I tried to push tube framed mids when I was working at Merc, no dice. The Verado/AMS mids are mostly castings, with a couple tubes welded on.

Anyway, dudes, this thread is AWESOME. I'm still researching every night and learning more and more. Let's keep this going.

First, I will call Monty at some point but I don't even know enough to ask the right questions. My current plan is to build my 3.6GT. Could I go Merc? Sure. But my boat was originally rigged with this engine, and now that I have one I'd love to hear it bark again. Also, a 22' deep V is kinda big for a 2.4/2.5 isn't it? I would think the torque of the v8s would be more appropriate on this style hull, and a smaller/rev happy merc would be happier on a shallow v/lake boat.

I'm still stripping my engine, but I've been reading about porting a lot on dirtbike and snowmobile forums, not so much information on outboard porting that I've found so far, and it's generally just beveling/rounding the edges of the ports on the sleeve. If anyone has links I am a sponge and spend at least an hour every night reading.

Right now I'm planning on getting the pistons out, then getting the sleeves bored as little as possible to clean them up, round the edges of the ports. Anything else I should be doing while I'm in there? Not looking to build an all out race motor, but while I'm in there I'd like to be aware of other mods.

My crank has some rust on the circular sealing disc things, but all the journals/bearing surfaces are perfect. Current thought is to build an electrolysis bath to remove the rust, as it's not destructive.

One other question re: gearcases. I have a 25" mid with normal looking gearcase. It looks like the 20" mids had an offshore exhaust snoot, and high speed gearcases. Is there a reason this wasn't offered on the 25" mids? And can a high speed gearcase be adapted to a 25" mid by swapping out the taller driveshaft? I've also seen some people running merc gearcases???

Keep it up dudes. And yeah gimmie those camshaft part numbers lmao

[FUJIMO]

...wonder where all the 3.5 litre offshore v-8's are?...

[powerabout]

2 of the gearboxes in Oz

[Instigator]

In kind of a catch 22 situation with finishing the shop.

A. Building funds are on vapors.

B. Can’t set up the shop until interior walls are skinned.

C. Can’t skin the walls until they’re insulated.

D. Can’t insulate until wiring is done.

E. Etcetera!

Good is, Fall is coming and is cooling off so I’m able to work in the barn until mid day before temps run me out.

W/no insulation/walls the barn is giant heat sink.

I put my temp gun on the roof when under direct sunlight and it was 118*!

So I had an epiphany!

So I can start to use the the shop and clear up some floor space, I built a workbench on wheels.
( can’t do much w/o my workbench!)

Not sure how many drywall screws I used but it was a ****ttt ton!