Anybody else use ebay for information about their motor?

[rudderless]

Monday I decided to tear my quad tendon half off my knee cap so I have some time to post stuff that was on my mind.

I have used ebay as a reference on all kinds of stuff from mountain bike stuff, my standup ski and now my ’76 omc15. I spent a year and a half researching that motor before the rebuild this winter. I found at least 4 different mids, baffles and other that helped me make a nice running 15 by studying pics on ebay. I kept the ’76 head as it was obviously much tighter, put in a pisser, made a target piece for the megaphone exhaust and so on. The early mids had a hole for the wet leg deal, later ones had 1 large hole and 2 smaller with the meg with a baffle in the back of the mid. Even later ones had just the 2 smaller holes. I copied a 2003 engine mid and exhaust for the ’76 by making a target piece at the bottom of the mid and using the meg exhaust. I could have not known or done that without the information on ebay. I don’t think the meg exhaust without the target at the bottom would work as well. Reminds me of my 550sx stand up exhaust.

Just look at the gen1 and gen 2 intake manifold. The gen2, 1993 and up, have a 3/8" passage between the 2 intake runners to balance the unequal lengths..idles great now.

Ebay is just not for buying stuff but can be a wealth of info.

Back to rubbing my knee….

[garry-in-michigan]

One of the things I love about our Antique Outboard Club is in the history uncovered. Jim Webb was hired by Ole Evinrude in 1924 retired after 40 years with the company as Evinrude’s Vice President of Sales. He wrote a book, "The Pictorial History of Outboard Motors", and then became our Club Historian. His many articles in our club magazine "the Antique Outboarder" are a treasure trove of outboard information. They are my "go to" source for outboard information. Another source is Peter Hunn’s "The Old Outboard book". When looking for engineering changes, I use the online parts books of MarineEngine.com …

It took a while to realize how much wasted horse power went out the exhaust. In the time of the great horsepower race that started in the late 1920s (and ended with the economic recession of the early to mid 1930s) – Evinrude experimented with super charging there outboards. They found a greater gain in power by putting the blower on the exhaust to extract exhaust rather than on the intake to pressurize the carburetor. These were physically geared to the crankshaft and, unsurprisingly, the exhaust extractor used terrible amounts of fuel for the added horsepower provided.

I have terrible luck on E-bay. I believe my bid on an outboard or part is a signal that the item is desirable. It seems that after my bid the price quickly goes out of site … This is true of items that no one had bid on, so then when the item was re-listed, I was encouraged to bid. LOL . . . . . 😀

[dave-bernard]

Garry wait till the last minute to bid that will keep it down.

[PugetSoundBoater]

Leeroy"s Rambling has a great amount of info on OMC 9.9/15 with lots of photos ,changes over the years ..shows newer vs older exhast legs design etc. Check it out. Hope your knee heals up well

"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson

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