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Thread: Origin of OMC Triumph 55
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07-30-2019, 12:51 PM #61The Historic Photo Master
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07-30-2019, 05:32 PM #625000 RPM
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Capt.Insane-o liked this post
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07-30-2019, 07:30 PM #63Screaming And Flying!
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true
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07-31-2019, 07:32 AM #64Supporting Vendor
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Proper term is "monkey balls"
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07-31-2019, 08:37 AM #655000 RPM
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07-31-2019, 09:29 AM #66Screaming And Flying!
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so in 68 you rev it up and turn the key off and get a bit of a shock?
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07-31-2019, 10:35 AM #675000 RPM
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I thought they all had the shift diodes (dog nuts) so they wouldn't shift into forward as the motor spooled down. I was surprised I couldn't find them in the parts look up for the 55 h.p. . I don't remember trying to rev one up and then turning the key off , but I do remember them going into forward at idle when the shift diodes (dog nuts) were bad and you turned the ignition off. Maybe that was normal with the 55 h.p. The shift pin was spring loaded to push the clutch dog into the forward gear as a fail safe , so you needed oil pressure for neutral and reverse. When the oil pressure got lower than the spring pressure you end up in forward gear.
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07-31-2019, 10:48 AM #687000 RPM
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How long did OMC use the electric shift lower units? I was wondering if they were still in use in 1973?
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07-31-2019, 02:32 PM #695000 RPM
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07-31-2019, 05:43 PM #707000 RPM
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At some point they went to a lower unit that looked to be about the size of the Mercury 650 and 500 units. Do you know when that was?
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07-31-2019, 07:59 PM #71
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08-01-2019, 08:37 AM #72Screaming And Flying!
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Mark75H liked this post
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08-01-2019, 09:25 AM #73
The smaller (later called Nitro) gear case came out 1974 in a limited production 70 HP 15 inch race model.
The standard 70 HP 15 inch 1974 model still used the larger gear case.
1975 was really the first year for the smaller gear case on the 15 inch 75HP.
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08-01-2019, 11:00 AM #747000 RPM
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I remember that the larger unit was working pretty well on the E Production boats. I was running a 650 against them and having trouble keeping up in 72 and 73. I ran the same motor on a SE boat several times in 73 and did quite well against them. 74 went back to a 500 in SD. Same props old SE boat.
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08-02-2019, 05:25 PM #75The Historic Photo Master
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Mark75H liked this post