LouC wrote:
OK here is some OMC history for you newer Horizon guys:
For one thing, OMC bought FW in around 1986 or so, that is why so many FWs from that time period had OMC power, the OMC power packages were cheaper than Merc packages.
The pure OMC Cobra came out for the 1986 model year, with the dog clutch shifting. It was made that way till 93. In 90 they came out with a cone clutch drive for the big blocks because the dog clutch version did not hold up well with the big block motors. In 93-94 OMC and Volvo went into a joint venture operation and the Cobra was redesigned, with Volvo's input and at the same time Volvo came out with their own version of the Cobra, which shared some transom castings with the previous pure OMC model but had cone clutch shifting in the upper unit. This became the SX drive (initially called Cobra SX) and the OMC Cobras built from the 94-98 years were identical to the Volvo. In 98 or so Volvo bought out OMC's interest in the joint venture and that was it for OMC in sterndrives.
So if you have a 94 boat it COULD be the newer joint venture product, but it also could be a 93 powertrain with the old style pure OMC drive. The joint venture ones are to be preferred because you can get parts from Volvo and Volvo techs can work on them. Good to keep in mind if looking at an older FW. You really have to check the serial #s to figure out the year of the engine package, but anyone who has seen both can tell the difference just by looking. The pure OMC model has a flat cover across the top of the drive, the Volvo has a 'hump' in the top cover.
Like I said, too bad OMC had financial problems, the dog clutch Cobra was really not a bad drive and properly adjusted shifts fine. But I would not advise someone to buy one now, 15 years after the last true pure OMC's were built. From what I heard, Bombardier is not making new parts for these drives and some items are already hard to find. As are mechanics who can adjust them right.
Lou,
Do you have pics of what the different drives would look like. I have a 94 OMC Cobra and on the engine it has Volvo Penta on it but I would like to be sure that it is the Volvo SX style drive. And my Sterndrive model number is 502ACPMD.
Thanks for the info!
_________________
Troy
2008 Centurion Avalanche
1994 Four Winns Horizon 180 SE 5.0L OMC Cobra (Sold)
2002 Ford F150 Harley Davidson Edition (
http://www.nhtoc.com) 378 hp & 465 tq at rear wheels
2008 Honda Accord EX-L w/Nav