Old motor new technology?

[Indymike]

I've committed myself to going through a 1973 115 Johnson. I would like to try and make the motor as efficient as I can. What, if any newer technology is available to apply to older engines.I'm a newbie when it comes to outboards and as I search around for parts most of what I see is OEM replacement. Power reeds come to mind as one of the few things that claim to be better than original.<br />Thanks for any feed back.<br /><br />Mike

 

[Dhadley]

Re: Old motor new technology?

The Boyesens are a good idea. Just work with the set up to get your slip as low as possible. The crossflows are good motors but will never produce the torque of a V4 looper.

 

[Indymike]

Re: Old motor new technology?

Thanks D.<br />Motor needs a new stator so while I'm at it I think I'll replace the power pack and coils too with CDI Rapair Parts. All these goodies are 30 years old. Have to think the newer electronics are better.<br /><br />Mike

 

[rabidfish]

Re: Old motor new technology?

Mike,<br /><br />You didnt say whether the stator was bad because of the ignition system, or the charging system...<br />I wouls save my money for things that will actually make the engine run better... perhaps rings, or new pistons. Also, I have used several CDI parts. Most are good quality, but some do not directly interchange. You could buy OEM parts for very close to the price of CDI. Contact me & I'll help you out. email: boatfix@rabidfish.com

 

[Indymike]

Re: Old motor new technology?

The stator has seen it's better days. Motor was running pretty good when I smoked a piston....see gurus.<br />This may not be the most fiscally responsible thing I've ever done but by gosh shes going to run again and run good wether she wants to or not...hehe...Heck its only money. Actually my thoughts are that pieces matched to the same manufacturer is the best way to go.<br /><br />Mike

 

[rodbolt]

Re: Old motor new technology?

good attitude <br /> its only money and usually it aint mine so I dont mind spending. do the fuel and cooling systems as well and you should have a motor for years.

 

[dolluper]

Re: Old motor new technology?

From your story it sounds like your bottom carb for 2+4 needs a rebuild since money is nothing do both carbs

 

[jy118lfd]

Re: Old motor new technology?

If money is not a problem how about a new evinrude e-tec I hear they are great!

 

[rabidfish]

Re: Old motor new technology?

They are great. I have etecs on sale!... call me!

 

[Indymike]

Re: Old motor new technology?

Just for the record the money thing was tongue in cheek. <br /> Actually I thought this thread might get alot of ideas tossed around. But maybe the 2 stroke world hasn't come as far as the automotive world in the last 30 years. <br /> But another thing that comes to mind is polishing on the intake side of the block. When I look at the machining done at the facory behind the carbs and reed blocks it looks like a little polishing would sure let some more air flow. And this is something I have seen very little discussion on.<br /> Surely some of you guys that have been tinkering with 2 strokes for a while have tried a few things. Heck even if what you tried crashed and burned, maybe someone got a similar idea to work.<br /> Kinda like discussing lift and duration on that big bad cam you just popped into that 69 smallblock. It didn't work too well with the factory intake but add a tunnel ram and wow we're on to something now.<br /> Jeesh I just went from talking about newer technology to regressing back to leaded gas and bell bottoms.<br /> Must be a.d.d. HEHE<br /><br />Mike

 

[Dhadley]

Re: Old motor new technology?

Some matching and smoothing does help but at higher rpm's than what it would appear that youre going to turn. In racing its not unusual to spend way more time on set up and the gearcase than on the powerhead. Especially the crossflows.<br /><br />It would help to know the type hull you will use and the intended use. Strictly top end runs, drag type runs, skiing, etc. There are small gains to be made in torque but if your hull wont respond to those small changes, then it may not be worth it. <br /><br />We can help make the map but we need to know where you are now so we can help lay out the route to get where you want to be.

 

[Indymike]

Re: Old motor new technology?

Thanks D ,<br /> I'm not trying to go racing...Heck it's a 16' 1973 trihull that I'm reworking as well.<br />Just trying to make an old motor run better and looking for different options.<br /> <br />My analogy wasn't very good was it.<br /><br /><br />I could buy a newer motor but that would take the fun and challenge out of it. <br /><br />Thanks,<br /> Mike

 

[Dhadley]

Re: Old motor new technology?

Set up is the key. Spend your time on that and a bit of money on a good prop. You'll come out better every time.<br /><br />Good luck!<br /><br />PS - I still think the Boyesen deal is a good idea.