OMC CD 3/6 Power packs

[B.Leonard]

I'm trying to find out what pack I need for my '84 2.6XP that has a higher or no limiter.

It appears the packs I have are the correct packs for that motor and do have a 5800rpm limit (Rapair 113-2651)

I am amazed at how many different 3/6 power packs there are. Why? What is changing in them? Are they tailored for a specific flywheel? Can't be related to timing advance, that's externally adj. Anyone know why?

It looks like 113-2817 will do the job (no limiter). Not sure if I need two since I can't read the part number on my starboard unit. The Port side is 113-2651.

-BL

[woody]

Hey B. Leonard !
I've got 85 2.6 GT.
582867 STATOR
582817,582510, IGN.
LAND&SEA Flex-Flywheel #910-001
Will rev 7800 rpm,582817 has no limit.

[B.Leonard]

I might have to substitute my life jacket for a flak jacket :D

I still have the stock 35 amp vented flywheel on mine. It looks fragile when stopped much less at 7800rpm.

I might want to stick with 35 amp wheel anyhow, those bottle warmers take alot of current! ;) :p

-BL

[woody]

7800 was only a example of what it can rev with that ign !
That is with 23p prop.
Didn't mean to frighten you, :rolleyes: but I thought you wanted to know what ign. would help make 2.6 rev .

[B.Leonard]

I'll keep those numbers handy.

How does your GT pull through that rpm band, any flat spots? Is your exhaust opened up? Still have the air box? What jets are you running? Any other mods?

-BL

[B.Leonard]

Called them to see what they have to add, they said;

1.) the reason there are so many is the different plugs on the leads to the coils/harness. The basic electronics are the same except the limiters.

2.) You can run one or two limited packs. One limited pack only may produce an inconsistent rev limit as opposed to running two limited packs.

3.) The limits can vary as much as 200rpm.


-BL

[woody]

Exhaust is cut below C/plate
65 main
12 ped reeds L&S
cle gearcase w/lwp
No air box
timing @ 20.
With lower pitch props it hits 7800 right now!
With 30 p mazco chopper it pulls hard to about 6700
Likes fuel to .
I'm all winterized and that stinks:(

[Robbie B]

I see your timing is only 20 degrees advanced , are you using high compression heads??? If so what compression pressure you running???

Just curious?

[woody]

Hey Robbie B !
Not sure, I think stock, cranking press was about 100 psi.
Going to re-build this winter , its apart on bench right now.
Stuck #6 piston last time out, tried timing @ 30 :eek:
Do you think heads should be shaved , and if so , how much ?
I want to use 92 pump fuel .

[B.Leonard]

My 2.6 XP is basicaly stock and thats the kind of psi #s I get. Although my 2 yr old does use my compression guage quite often :D

I made a post on hotboat about those 65 jets. That sounds a little lean but with only 20 deg timing and maybe higher elevation? You might get by. I was running 67s and the plugs looked like I was using propane for fuel. Way too clean. Eventually burned a piston (#4) slightly when the stock pumps couldn't keep up anymore. Switched to a Holley red pump and 71 jets.

I still have the exhaust corked and air box on.

I've heard .010 is ok on the heads and .02 is getting up there. Neither is ok for 30 deg timing. 26-28max! As you well know :p

-BL

[woody]

Thanks for the specs.
Need all the help I can get, got a big boat to push:)

[Robbie B]

Machining cyl heads on the crossflows is not just a simple matter of cutting a bit off the gasket face. The squish area clearance is also reduced at the same time.( dist between the very top of the piston and the head) Should be NO less than.038" - .041". The pages I sent you detail this. Be very carefull if you go the full .030" as described as the contours of the head don't match the piston that well. I recontoured the head to match the piston contours exactly to give even clearance all round. Its LOTS of work and time!!!!!!!!! All ways check clearances with modellers clay any time you machine your heads!!!!! Timing at 20 degrees seems slow to me but every engine is different. Mine ( 79, 235, small block) wouldn't pull a dead chicken off its nest at that.

That my opinion for what its worth.

Good 92 gas should still be Ok with .030" removed and squish band relieved about .020"

[Freddie Webb]

Why would you want to shave those heads you are going to change the squish band. It is easier to weld them up on the exhaust side and cc them. You will get better results this way. Unless you just plan on staying on pump gas.