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Thread: The OMC Cross Flow Thread
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12-04-2022, 12:35 PM #91Member
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some where in my basement i have the specs on thr 2.6 gt was 265 hp at 6250 rpm they came with single stage carbon reeds good for 10 hours we were told to change them after 10 hours of hard running when you got them set up right they were fast for there day
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12-04-2022, 12:39 PM #92
It sounds like you have it. Much earlier in this thread I copied an old Land and Sea catalog. There is an excellent graph and description of all jetting conditions in relation to power output and the risk of jetting too lean. For every 10* of air temp you should jet up or down one jet size. I usually raced with 67's in my carbs, and for skiing and screwing around on the lake with my buds I would run 68's or 69's. With the fatter jets when the weather would turn hot and very humid it would 4 stroke at wot. A benefit was that if it turned cooler, like into the 60's, I wouldn't have to rejet and my boat would rip. The last use of my boat every year is usually the Connecticut River Run 3rd weekend in October. The morning is usually in the 30's or 40's. I put in 70 or 71 jets in for that. My motor isn't some super sensitive race motor, it's just a stock 235 with the good heads and plenty of exhaust relief.
I guess the moral of this story is that if you jet fat you will e a le to use yoj boat in almost all conditions without worrying it you are too lean for todays air temperature.NRA Life Member
58' Farmall Cub
Is that your mama's boat?
"I said I didn't have much use for one. Didn't say I didn't know how to use it."- Mathew Quigley
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12-04-2022, 12:42 PM #93
I just realized that those pictures of the Land and Sea catalogs that I posted were victims of the great photobucket dump. I will repost them today.
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58' Farmall Cub
Is that your mama's boat?
"I said I didn't have much use for one. Didn't say I didn't know how to use it."- Mathew Quigley
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12-04-2022, 02:37 PM #94
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12-05-2022, 08:10 AM #95Member
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12-05-2022, 08:21 PM #96Member
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12-05-2022, 08:24 PM #97Member
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12-05-2022, 08:33 PM #98Member
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12-05-2022, 08:37 PM #99Member
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12-06-2022, 07:29 AM #100Scream And Fly VIP
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Engine is a 1984
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12-06-2022, 09:11 AM #101
Man, those were great engines.
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58' Farmall Cub
Is that your mama's boat?
"I said I didn't have much use for one. Didn't say I didn't know how to use it."- Mathew Quigley
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12-06-2022, 10:59 AM #1027000 RPM
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Did you note the numbers on the stern side of each ignition pack?
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12-06-2022, 05:37 PM #103Member
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looking at your pictures are you sure you have a 2.6 because the 2.6 xp had a difference lower unit your does not look like what we had from omc
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12-06-2022, 07:20 PM #1045000 RPM
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That’s a great looking engine. I love those things!!!!
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12-07-2022, 07:53 PM #105
Crossflows
In addition to the fine advice that has already been posted... I would add...
Get yourself a length of Water-and Steam-Resistant EPDM O-Ring Cord Stock McMaster #9616K17 and replace those water diverters immediately! I've had two motors stick pistons from that crappy vacuum hose OMC used when they swelled and blocked all water flow down that side of the block. Also, go aftermarket on the ignition. If you've ever seen the schematic of an OMC powerpack (and could understand it) you'd never leave the dock. The slightest variation from the stator charge coils and trigger base will cause those packs to miss fire. I had a timer base go bad at WOT and it was the most horrible sound I'd ever heard. Thought I split the motor down the middle! I can't believe the motor actually survived it. Also, there's an air bleed hole at the top of the head gasket that when it clogs (only 1/8" diam) from sea a shell, gasket material etc. it causes a hot spot. Drill another one about 3/4" to the side of that one.
As far as power, second biggest power maker (1st being more compression) is getting weight out of the pistons. The Merc guys will have an orgasm if they can get 15g out of their reciprocating assembly, and there's 150g to be had in those stock pistons if you use a CNC machine, at least half that if you do it by hand or bridgeport mill. Keep in mind it will all be power under the curve, no rpm increase, those motors with that 3x2 front half will only go low 7K as has already been said. Maybe 7400 with the wind at your back and jacked to the moon.
-BL
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