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Mark75H
10-28-2004, 10:10 PM
Oh, yeah!

Mark75H
10-28-2004, 10:11 PM
Page 2

Mark75H
10-28-2004, 10:23 PM
Preface

omc-v4
10-29-2004, 07:00 AM
thanks 75h the johnson motor covers (stock) had a point at the back the stinger cowls were flat like an evinrude also this cowl has a buldge in the top.did they ever build a stinger with a 69 cowl? this one is a 70. i went to all the trouble to paint a 75 cowl which was first year with a flat back and put 69 medialons on it.

Mark75H
10-29-2004, 07:44 AM
My notes say the first year of the Stinger name was 1969, so my guess would be yes.

Mark75H
10-29-2004, 07:15 PM
I had seen the post that held the strap, but never knew what it was for until now ....

Mark75H
10-29-2004, 07:19 PM
Steering & dual engine tie bar bracket

Mark75H
10-29-2004, 07:19 PM
Switches & Hot idiot light

Mark75H
10-29-2004, 07:21 PM
Gasoline suggestion & break in procedure ..... if you are getting lead fouling use a different brand of gas, sounds easy to me ...

David_L6
10-29-2004, 10:13 PM
Sam,

What's the break in procedure for one of our motors? Just hope it doesn't break?

If I broke my motor in the way they recommend I'd have to tear it down half way through and put in new top rings! :eek:

That's some neat stuff you're posting. Please continue.

Mark75H
10-29-2004, 10:19 PM
OK.

Props

Mark75H
10-29-2004, 10:20 PM
Block

Mark75H
10-29-2004, 10:22 PM
Drive shaft housing

Mark75H
10-29-2004, 10:25 PM
Thrust "jack"

Mark75H
10-29-2004, 10:26 PM
Gearcase Group

Mark75H
10-29-2004, 10:32 PM
Some information about the item Ref#15

mk30h
10-30-2004, 04:06 PM
Sam,Is that the same gearcase that was used on the erlier x-115 engines a few years earlier? Looks very similar.

Mark75H
10-30-2004, 05:51 PM
Originally the X-115 used similar looking gear shift lower unit and later could get an optional 1:1 lower unit (possibly the same optional 1:1 unit as the Stinger). The 1:1's had a smaller diameter than the 14:23's.

I'm not certain when the 14:23 non shift unit was first available, it is possible that a few 1968 X-115's may have had them, but I doubt it. I'm certain it was not available in 1967.

Compare the area where the prop shaft comes out of the Stinger case to the X-115 below. The gear shift 14:23 uses a large hub prop, the others all use small hub props. I think the gear shift unit was a rear loader and the all the others were front loaders.

http://forums.screamandfly.com/forums/attachment.php?s=&postid=319283

Mark75H
10-30-2004, 07:53 PM
Here is the top of the gear shift X-115 with the water pump off.

Mark75H
10-30-2004, 08:11 PM
As you can see, these are also dual pinion type lower units, like Merc's Super Speedmasters.

I've never seen the insides of any of the larger OMC racing racing lower units. I asked Charlie Strang a little about them once and he told me he got around Merc's patents by using a floating gear on the prop shaft. Two drive shafts come down to drive a double sided gear on the prop shaft that can just slide back and forth to balance the load between the front and back gear pairs.

If anyone has an OMC apart, I'd be grateful to see the innards, be it a gear shift X-115, club foot or skinny 1:1

Or if anyone can raid the Bombardier archives and get the secret parts lists ..... :)

Mark75H
10-30-2004, 09:03 PM
This is one of several variations of the 1:1 OMC.

I think it is an early variant. Some of the others had less nose, some had more nose.

As yet no qualified OMC racing expert has stepped forward to help us out on these issues. If you are reading this and can help us, please chime in and help us fill in the gaps.

mk30h
10-31-2004, 12:01 PM
thanks Sam,

Boy that x-115 unit looks a lot like a sleeker merc standard unit of the day ( the exception being the exhaust outlet on below the cavitation plate).
Interesting to see the OMC stuff from this period. I think Strang is probably the most important individual in the development of outboard from the fifties onward. Would love to hear his story.

Mark75H
10-31-2004, 02:50 PM
The X-115 exhaust outlet below the plate is optional; usually it went out the back above the plate. They built it with the option because it had to be below the plate in Europe.

Mr. Strang would politely say that he delegated work to others most of the time. He came to Merc after the Quicksilver lower units were already in production, but is a least responisble for the concepts of the inline 6 and the Speedmaster. At OMC he was directly responsible for the X-115, but moved up the chain of command pretty quickly after that. I've asked him about various projects along the way and his usual response is something like "I don't recall who I assigned that to" or "there were so many people involved it is hard to give credit to any one or small group because we worked on it basically when there was no other work for some particular individual. Racing had the absolute lowest priority." Engineers worked on racing stuff only when they couldn't progress on the project they were on because of some one else's delay. Sometimes they'd get a week or two in on a racing project, but often only a few days before they'd hand it off to some one else or just shelve it until things slowed down.

As far as comparing the X-115 lower unit to a Merc ..... the only Mercs that compare are the 1250 BP and 1000 BP which were developed to directly compete with the X-115 in the same classes