two barrels

[ultrafast30]

has anyone out there run two barrels on a 45 inch omc twin. I have a set of 1-1/16" bore carbs setting on the bench. A two piece manifold doesnt look that hard to build!! Or is it too much?

[Mark75H]

Yup, been done. One of the guys is a member here on BRF.

[ultrafast30]

the big question -does it work?

[Pop990]

a guy in georgia is running the 1 inch ones on a hydro. seems to work good

[proprider01us]

You definitely want the 1" bores, waisting your time with the others.

[Mark75H]

I saw another set today. I do not know if they do much without other mods.

[OUTBOARDER]

has anyone out there run two barrels on a 45 inch omc twin. I have a set of 1-1/16" bore carbs setting on the bench. A two piece manifold doesnt look that hard to build!! Or is it too much?

FEH/850/SEH on the 45, 2 bbls helped out with acceleration, once up and running.......

The 1" venturi 2bbls will light up a stock 45 for acceleration.

The intake plate isnt difficult to make if you can transfer holes from an intake gasket and 2 bbl gaskets. no mater how crude it will wake up a 45ss.

Geometry gets complicated when making improvements with transition into the front. Since I am not a tool and die maker I had to measure a 45 front half on CNC Bridgeport w/digital readout and probe tip, then took coordinates over to Auto Cad and made a dwg to machine with tapered and radiused end mills to smooth out transition effective areas.

Am in the process of making some intakes and air horns if interested
let me know

Anthony 38E

[Mark75H]

Sonny's new motor looks cool

Roanoke Rapids is not that far from you

[BRIAN HENDRICK]

I do not know if they do much without other mods.

Lots of big venturis on the front of this one:eek:
Can not quite make out the number//:confused:
Seems to have 'woken up' this '45' .....:cool:
Big fat pipe too ...///
God only knows what else....
Maybe AV100LL:confused::confused::confused:

[Mark75H]

Pretty sure that is at Camden NC. Like I said, lots of other mods.

[OUTBOARDER]

Pretty sure that is at Camden NC. Like I said, lots of other mods.

Team Rubber Made 45ss with the signature 32 gal trash can cowling.

This was the last time we ran the 195lb great white hydro.

Anthony

[OUTBOARDER]

Sonny's new motor looks cool

Roanoke Rapids is not that far from you

Hope to get up with Sonny and help out.............. have a pipe for his engine.

Missed Lambertville :(was in the machine shop fabing up first progressive 2bbl prototype, will make a couple of these............

Have some things cooking:cool:

[Mark75H]

Yeah, Sonny told me about the concept. Application looks good.

[David Mason]

I have been around these engines for some time. I never have raced a twin. No sense in it when it is cheaper to build and go faster in a triple.

At any rate, I have seen more than a handfull of folks try these two barrel carbs. Each and every one of them had problems. It was a constant battle. I have seen them run and run well, but like I said, it is a contant battle.

This is just my opinion.

[ultrafast30]

Thanks, guys. This looks great. The progressive linkage looks great. I too will consider this. I love to work on the mill. Any ideas about jetting. Shut down the idle circuit on the secondaries? I suppose you could just jet to idle on both.

[Mark75H]

I understand the concept and the application seems proficient, but to what end? Will the secondary barrels be jetted differently?

[OUTBOARDER]

I understand the concept and the application seems proficient, but to what end? Will the secondary barrels be jetted differently?
W.O.T.main jets will be the same, low speed transition jet will be tweaked to help with punch.........................

[ultrafast30]

I use this concept with the mercury laser injection. I have used the brucato SVS system and also used OMC looper throttle plates. The secondaries only operate from 3/4 throttle up. It is a real kick in the but when the secondaries open. I have done a couple of laser motors that can't be caught by a conventional 260 motor.

[Fast Fred]

or you could have even bigger secondarys like these
<a href="http://tinypic.com" target="_blank"><img src="http://i41.tinypic.com/inec02.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

[Fast Fred]

<a href="http://tinypic.com" target="_blank"><img src="http://i41.tinypic.com/2qd1uyp.jpg" border="0" alt="Image and video hosting by TinyPic"></a>


300 bucks gets them, comes with hand made intake.:cool::eek::cool:

[Mark75H]

Straight bore with no venturi ... will they work under all rpm conditions? Looks like a leanout burn up machine to me

[Fast Fred]

these are not Merc parts.:eek:

[Mark75H]

these are not Merc parts.:eek:

I know, they are OMC's ... it doesn't matter

[Fast Fred]

?, ok then, did you need me to run them up for you, cuzz i could do that. 10's of thousands of carb later i'm thinkin i got's a handle on the carb thing . bein thats what i do, not just for fun, pays the bills to.

Bring it on.

[Fast Fred]

venturi is thare you just can not see it, the world is not flat you just can not see it from ware you are.;)

[Jackson]

Fast Fred whats your number??

[Fast Fred]

?, i don't know, i'll see if i can find it, my phone dose not post it, i never call my self:eek:

[Jackson]

DO you want to make some money R what????????????/

[Fast Fred]

money is good, did get a fat Bonus for all them carbs i did, Boss Lady is nice to Fred, never saw it comin, just doin my thing. Pm me your number if you have caller ID you will get my number.:cool:

[OUTBOARDER]

I have roughed a few extra's if anyone is running under the stock cowl.
Good for one jet size increase. They are only 1/2" tall for use under the stock cowl.

One more machine shop session and will be ready to ship!

Can Also make these for tuned length at rpms, good for two jet size increase.

Anthony McCulloch

[Fast Fred]

:cool:

[OUTBOARDER]

roughed out 12 on Sat! Have new corner rounding mill and will finish up in one more sesion. Will have some extra's email if interested!

Anthony

[Powerabout]

<a href="http://tinypic.com" target="_blank"><img src="http://i41.tinypic.com/2qd1uyp.jpg" border="0" alt="Image and video hosting by TinyPic"></a>


300 bucks gets them, comes with hand made intake.:cool::eek::cool:
Fred
Nice looking carbs, 3 jet version and idle circuit only in one barrel!!!!
I thought it might be cooler to put the cross shaft higher or lower in the casting seeing as someone went to all that trouble to cast them?

Is that 300 for 3 with manifold for a 3 cyl?
I'm saving up and will need a straight in front for a 56 er
Regards
Powerabout

[Fast Fred]

i was thinkin thin the rod out, i only gots them two carbs. if i had a 3rd i'd run them. it's not a fact that the 6pack front half makes more power on the 56er than the stock set up.:eek::cool:

[OUTBOARDER]

Allmost there
Anthony[/QUOTE]

[ultrafast30]

lookin pretty. I was going to build a couple a those outa plastic. Yours are prettier!

[Powerabout]

has anyone put them on a carb on a flow bench to see what they do?

[OUTBOARDER]

Allmost there
Anthony[/QUOTE]

Done:D

IMPROVES AIR FLOW GOOD FOR 1 JET SIZE INCREASE :)
LEARNED HOW TO RUN THE BRIDGEPORT AGAIN AND WILL MAKE FIXTURES IF I EVER DO THESE AGAIN!!!!

[Powerabout]

very nice

what are they going on?

[OUTBOARDER]

The carbs were modified for a 45ss under the cowl......
The bellmouths wil fit omc 2bbls....
Thanks for lookin
Anthony

[OUTBOARDER]

bellmouths still available:)

[OUTBOARDER]

bellmouths still available:)

Have a few left!!!!!!!!!!!!!

[genea01]

do you think the 2 barrel carbs will work on a 59ci merc

[OUTBOARDER]

Yes, it would be possible...................
alot of work though to do it the first time

[JohnsonM50]

has anyone out there run two barrels on a 45 inch omc twin. I have a set of 1-1/16" bore carbs setting on the bench. A two piece manifold doesnt look that hard to build!! Or is it too much?
Ive seen it done to an OMC 22ci with 2 Tillotsens, it did OK as a 1st run but thats the only time I saw it. 2 of the 35hp OMC carbs [w/o the electric choke brackets] could be lined up & coupled at the throttle axles fairly easily as a side by side. Then of course the I-manifold would need work. Id guess you would have to put a plate in to separate the manifold since as a 1 carb-er its open to both reed sets. Ive been tempted to try it for some time but these would likely be too much for my 31.8 twins.

[OUTBOARDER]

has anyone out there run two barrels on a 45 inch omc twin. I have a set of 1-1/16" bore carbs setting on the bench. A two piece manifold doesnt look that hard to build!! Or is it too much?

60 Horse 2bbl Intake

--------------------------------------------------------------------------------

Quote:
Originally Posted by iwanajohnson
These are the results from the 2007 jet boat races and the black flame boat is the 60hp motor. it's quck. The same guy also owns a 2 cylinder that won the 40hp class that runs 52mph. it only gets beat by the 60hp but it could very well outrun the 90's and 120's.
Results:

60 Horse power class won by 60 Horse Johnson, Legend Boat, Jason Luttrell

90 Horse power class won by 60 Horse Johnson, Legend Boat, Jason Luttrell

120 Horse power class won by 60 Horse Johnson, Legend Boat, Jason Luttrell

150 Horse power class won by 60 Horse Johnson, Legend Boat, Jason Luttrell

60 Horse Twin 2bbl intake/front mods for Luttrell by Anthony McCulloch

[Fastjeff57]

I have one of these motors 'under the bench' and have been thinking of playing with it. Mine is an earlier 50 hp 45 twin (I measured it) without finger ports that I believe the later motors have.

The plan is to mount it on a Mark 55 tower and couple it with a drive shaft adapter. (My dink boat, where I run all kinds of homemade contraptions, must have a full gearshift LU since it's used as a dingy.) Plus, I have cornered the world on 11 spline Mark 55 props!

Question: Does anyone out there have photos of the later motor's bore so I can see what I have? Also, a few parts are missing off my powerhead, like the lower crank seal plate (same as the triple's) and the entire throttle linkage. If anyone has these parts laying about and wants to part with them, please let me know.

Thanks,

Jeff (Lifetime Merc guy)

[OUTBOARDER]

I have one of these motors 'under the bench' and have been thinking of playing with it. Mine is an earlier 50 hp 45 twin (I measured it) without finger ports that I believe the later motors have.

The plan is to mount it on a Mark 55 tower and couple it with a drive shaft adapter. (My dink boat, where I run all kinds of homemade contraptions, must have a full gearshift LU since it's used as a dingy.) Plus, I have cornered the world on 11 spline Mark 55 props!

Question: Does anyone out there have photos of the later motor's bore so I can see what I have? Also, a few parts are missing off my powerhead, like the lower crank seal plate (same as the triple's) and the entire throttle linkage. If anyone has these parts laying about and wants to part with them, please let me know.

Thanks,

Jeff (Lifetime Merc guy)

Take a picture and put it up!

[Fastjeff57]

Photos.

Jeff

Note: The bores are heavily greased to prevent rust.

[thornl01]

To my best knowledge, none of this series engines had fingerports. The 40/48/50/60 blocks were basically the same except for the later ones w/ the exhaust relief hole ( which you don't wont)
There is quite a few folks on this site that have very very good knowledge of the workings of these engines, and also can provide you w/ parts / information on mods that will really wake up these engines.

It all depends if you are going to race stock, or want to play hard.

A pair of 2 bls will wake this baby up. :cool:

[Fastjeff57]

Thanks! I am in the "play hard" group, but I love building weirdo motors for my little boat--it makes the winter months past easier.

I would greatly appreciate any and all info on making these 45 cube OMC twins go!

Here's a few of my present project motors:

1. A 30 cube (Merc 350 twin) with homemade external reeds.

2. A 65 hp triple adapted to my favorite, Mark 55 tower, and

3. My 'regular' motor, an offset plugs 44 with a custom hood.

Jeff

[Powerabout]

I love the cowls..nice kit

[OUTBOARDER]

2bbls on a stocker helped out.
Lambertville 2000 I think.
1" 2bls with #64 main jets.

It was a fun ride

[Fastjeff57]

Far out! I might play with that 45 cuber yet.

Jeff

[OUTBOARDER]

Found this clip, just meesing around!
http://www.hydroracer.net/FEHSEH.wmv

John Runne at Sharptown.........

[Fastjeff57]

Thanks! That one's a keeper.

Jeff

[Mark75H]

I suspect that boat was running 100 mph at this race. He timed the start to meet the 70-75 mph C class boats at the starting clock and passed them like they were literally standing still. By the end of the race he had lapped the entire field and was looking at the roostertails of the stragglers the second time. If it had been a 4 lap race ... he probably would have passed half the field again.