Re: [OMC-Boats] Thank you all.

From: Lee Shuster <Lee.Shuster@...>
Date: Thu, 3 Sep 2009 09:25:01 -0600

Some random thought on prop selection/testing:

A) Install a Pitot 0 - 35 mph speedometer in the original dash hole. Or go digital with a paddlewheel drive speed. There are also speedo that hook up to gps units. A lot of these electronic-based speedos can be calibrated, see next:

B) Get a GPS to verify (& calibrate) your new speedometer.

C) Check install tach against another shop tach.

D) Choose new prop based on your anticipated Usage and passenger loading. The Buick does have excellent torque and very decent fuel economy, assuming the Rochester 2GC is pretty-much 'on-spec." If your frequently carry four or passengers and a dog and intend to tube, ski, wakeboard, I'm guessing a 15 or 17 SST would be the best prop under those circumstances.

E) but getting verifiable data is the starting point.

I've got a m/c question -- I'll take it to you offline.


-----Original Message-----
From: omc-boats-bounces@... [] On Behalf Of Justin DeSantis
Sent: Thursday, September 03, 2009 8:37 AM
To: Evinrude & Johnson Boats of the 1960's and 70's
Subject: Re: [OMC-Boats] Thank you all.

Thanks Lee. So you do thing I should change props to keep me a little lower RPM at redline? I'll look into that. Like you said maybe over the winter. So that would be in effect "lowering the gearing" like changing sprockets on a motorcycle. I should get out of the hole faster if I re prop for a better WOT rpm?

One more question popped up yesterday. My throttle cable seems to have excessive play. Moving the control stick forward will engage forward gear, but it doesn't seem to increase the throttle until it get about halfway to full forward. It still seems to reach full throttle though, so maybe I should leave it alone.

On Thu, Sep 3, 2009 at 10:25 AM, Lee Shuster<lks@...> wrote:
> CONGRATS! Nice job of troubleshooting and repairing you ccoling issue
> and re-introducing the boat to the river.
> OMC/J-E designed and built those trailers themselves. Just like they
> wove the fiberglass themselves. They didn't cut corners and they
> rarely farmed out production.
> It was pretty much all in-house, from R&D, testing manufacturing,
> service, marketing and sales. When they did out-source, it was
> carefully selected like the GM engines.
> You want to keep WOT RPM to the OMC recommended 4000 to 4400 RPM. And
> you are right about top speed being little more than macho bragging
> rights or validation of horsepower/weight ratios.
> And remember that fin may reduce top speed by 2 -3 mph. I'm guess with
> you and your dog in the boat and a full tank of gas, and a clean or
> waxed hull, you should be able to easily see 37 mph on smooth water and no wind.
> Without the fin and slightly less weight under perfect conditions 39-40 mph.
> OMC "Type 14" or 14-inch Pin-drive props are out there, you just gotta
> know what you're looking for by Part Number, available on my site:
> If your boat still has the original prop, my guess is its possibly a
> 14 x16,
> 14 x 18 or 14 x 20. Those were by the most popular pitches.
> Lee
> PS -- Think of all the fun you can have this off season, improving the
> old gal for next season!
> On Sep 2, 2009, at 10:05 PM, Justin DeSantis wrote:
>> I'm reading up on prop selection now. I think I'm going to replace
>> mine regardless. I noticed a slight vibration and the prop is a
>> little dinged up. I'm thinking the 2 may be related. It's usable, but
>> has a few marks. I can live at a lower RPM cruising speed anyhow.
>> It's not like I need top speed all the time, or ever, really.
>> I sort of assumed the Loran system was a bit outdated. The guy who
>> gave it to me remembers it being very expensive 20 years ago when he
>> bought it. I don't doubt it, but, accurate within 1/4 mile? A $100
>> cheapo GPS can do way better than that and I don't need to know map
>> coordinates and such. Plus it has a pretty picture on the display.
>> The dog is my boxer mix, Brody. He's not crazy about boating yet. I
>> have 2 other dogs. A German Shepherd who I know will hate it. And a
>> Black Lab who would love everything about it. But she's getting kind
>> of old to get in and out of the boat. I may take her next time anyhow.
>>> If redline is the same for the V6 then it is 5000 RPM and you should
>>> be in the 4400-4600 territory at WOT, Lee has some great reading
>>> about prop selection and gearing. My simple mind boils it down like
>>> this....there is always a trade off (top speed and lower RPM WOT
>>> traded for better hole
>>> shots) I plan on messing with the gearing this off season, but I
>>> have been know to run my Sportsman up into the 52K territory NOT
>>> RECOMMENDED but I do it sometimes.
>>> Comment 2, as former coastie, I used to maintain that LORAN signal
>>> not all that long ago (circa 1991...jeez) it is a 100KHZ signal that
>>> is all time based you recieve 8 pulses from a primary station, then
>>> a secondary measure the time distance between the two, that plots a
>>> hypebolic curve...then youn measure the distance between primary and
>>> a third station for a second curve and where they intersect is you
>>> location...accurate within a quarter mile!!! :-) I hear the system
>>> is actually still in use in some places, but technology marches
>>> on...stick to the GPS....*sigh* memories
>>> Comment 3, That is a nice looking dog, and it looks like you had a
>>> great time out there. making me look forward to my next outing with
>>> my furry buddy (The Dude)
>>> Cheers,
>>> B.C.
>>> On Sep 2, 2009, Justin DeSantis <duc1098desmo@...> wrote:
>>> With all the great help I got from this mailing list, I was able to
>>> get on the water today. Pics here
>>> I'm happy to report, the old Johnson ran beautifully. I was very
>>> impressed with the motor. Not the highest top speed on the river,
>>> but nice and torquey. Took right off and planed nicely. No issues to
>>> report. Few observations though. The marketing hype about the
>>> sea-foil hull isn't just hype. The boat rides much nicer than my tri-hull did.
>>> Crossing wakes didn't result in the loud,hard slapping like my old
>>> Glastron. It just glides through them. Maybe not as smooth as a deep
>>> V, but very manageable. Cable steering is a little odd. Higher
>>> effort than I'm used to. And you have to spin the wheel several time
>>> to get from side to side. It sort of felt like I was always having
>>> to steer the boat. Not so much that it won't track straight, just
>>> that it needs lots of little corrections. Maybe the cables can stretch a bit?
>>> I still need to re-acquaint myself with some basics like anchoring
>>> and docking, but other than that it went smooth. I actually
>>> impressed myself with how well I did launching and recovering.
>>> Considering I hadn't done it in years and it was my first time with
>>> this boat, it was easy. One shot both times. I had a chance to
>>> inspect the trailer once the bot was off it. I don't know who
>>> Johnson had building the trailers, but they built a nice trailer.
>>> The companies building the junk today could take a lesson there. If
>>> the boat sinks, I could refit the trailer to haul bulldozers around.
>>> I'm thinking a couple of posts at the rear corners of the trailer so
>>> I can see it with the boat off may be a nice addition. I left the
>>> remote control for the electric winch at home, so I had to crank it
>>> on the old fashioned way. It wasn't too bad though.
>>> Maybe a question though. What rpm should I be running at wide open
>>> top speed? I was getting uncomfortably close to redline I thought. I
>>> don't remember what red line is, but top speed is within 500 of
>>> redline. I only went there briefly. I didn't want to stay that high
>>> until I asked you guys. I'm thinking maybe I want to change props to
>>> get my WOT rpm down a bit. (If I can even get props for it.) I
>>> forgot my GPS and the boat doesn't have a speedo, so I don't know
>>> what top speed is. I hope to find out tomorrow.
>>> The previous owner gave me this ancient King Loran thing from 1987.
>>> Looks like something from Tron or Wargames. I think the technology
>>> is obsolete though. I don't even know if it gets a signal anymore.
>>> If it did, it seems like it would be a pain to use compared to modern GPS.
>>> I'm thinking it will be a great paper weight and thats about it.
>>> Again, thank you all for your help.
>>> Justin
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Received on Thursday, 3 September 2009

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