New Engine Option for the Mac

[Traveler]

I have been doing some research on repowering my 2002 26X when I stumbled across the new Yamaha F70. I think I found what I have been waiting for. Finally a 70 HP 4 stroke that is nearly the same size and weight (260 lbs) as my Yamaha 50 High Thrust, uses the same controls, has the same high thrust gear ratio and uses the same props. The props will need to be repitched, but prop repitching from a 14 x11 to a 14x12 or 13 is cheap.
Has anyone else done any research on this new engine or seen one on a Mac?
I probably need to come clean on being a member of this forum since 2005 and never posting or contributing. I have owned a couple of Macgregor’s and have utilized this site for maintenance and mod tips for years. I thank all of you for the tips and tricks and will attempt to be a much more active member in the future.

[Russ]

I've got a Suzi 70 on the back of ours. Love it.

[Traveler]

I also like the Suzuki engines. I have several friends with them and they all seem to have very little problems and good performance. but the weight savings of the new Yamaha is what really got my attention. Until this year a 260 lbs, 70 HP 4 stroke was not avalable. Of course it is the first year of a new model and that can go either way.

[Bobby T.-26X #4767]

the one thing that should be noted is the cubic displacement: 996cc (60.8ci). that's why it weighs 260#.

the Yamaha 70hp uses the same power-head as the 40hp, 50hp, & 60hp; just tuned differently to achieve a higher RPM.
Yamaha Spec Sheet
most other 70hp outboards use the 90hp power-head which will realize a 1250-1600cc rating.
it really is an "apples vs oranges" comparison.

that said...i'm sure it's a fine motor, but be aware that the results you achieve will not be comparable to a true 70/90 power-head.

Bob T.
"DāBob"
'02X w/ '04 90-TLDI (14" x 11 pitch)
Dinghy Motor: '06 2.5-Suzuki

[Duane Dunn, Allegro]

At the Seattle Boat show BWY had two M's on display, each with a different motor showing off the Suzuki line. In the new Suzuki line the 40, 50 and 60 are the same powerhead. The new Suzuki 60 they had on one boat fits the very nice. It is very light (229#), fully tilts without hitting the seat, and gives you very close to the performance you got with the older Suzuki 70 BWY has been installing for years (941cc).

http://suzukimarine.com/sr_10/df60-50-40/

The new 70 that was on the other boat, shares it's power head with the 80 and 90 and while it is heavier (341#) and doesn't tilt with out hitting the seat, it gives you even better top end (1502cc).

http://suzukimarine.com/sr_10/df90-80-70/

[mikelinmon]

New motors, new problems, sometimes. Just saw the new Honda 60, light, tight neat and pretty. Also, finally EFI. A must for OB's. It would look good on a Mac. But, we will stick with the E-Tec 60, tried and true, preferred by the fishermen. They sometimes take off perfectly good misc motors just to get an tiny bit extra range. We repowered one fishing boat with two E-tec's costing the guy $18,000. He only saved a little bit of weight, (one fat guy) and gained 5% by the numbers of extra range. Just for a fish! The Yamaha 70 sounds good. Does Merc hyave a light 70? Might since Yamaha makes much of the Merc 60hp.

[beene]

I love the grunt my 75 has.

With our boats, I am convinced it is not about hp, but torque.

You need big displacement to get these boats out of the hole quick.

If you never want to water ski behind one, then no big deal.

My 75 at 1600cc will throw the 26M out of the hole and on plane in seconds.

If you're not sitting down when I roll on the power, you soon will be.....

G

[mikelinmon]

Need to look at the new Suzuki 60. News to me. I sold many of the old 50hp Suzy's. Good motors. Only thing was the small prop and frequent maintenance. Smooth, quiet, pretty, good folks to do business with. Hopes the new Suzy has bigger prop. OB seem to be really designed for 40 mph or more, just look at the props they come with and the pitch. When will someone make a diesel OB. Those saildrives are so close to what is needed. So close, so far. I put one in a Mac 36 cat back in the day. Rotted away in one year from electrolysis. But it was kool to have an inboard M36. I used a straight exhaust just to make noise, was much younger then.

[Laika 26X]

Now I got ALL you beat…and SA can eat my wake too!!

I recently acquired a used General Electric S5W SSBN Reactor from the NAVAL SRP program.
It has at least 7 years left before refueling. Coupled to my Westinghouse Steam Turbines and gear reduction system, this puppy outputs some 25000 SHP at 110%

Detail’s to follow in the soon to be posted “Nuke Mod”



Now once I get the Flux Capacitor issue worked out, I’ll really go places.

Future plans include conversion to antimatter and trans-warp drive.

“Sub” Ed
(Sorry...long boring day at work)

[Highlander]

I agree with beene Its all about the torq, not the horses , lots of horses & less torq will give you more top-end speed on a lightly loaded boat , but less horses & more torq is more fuel eff. & will get you up on cruising speed a lot faster & will be very happy working @ half throttle, will also push your heavily loaded mac up those big 12-15ft swells with out having the need to go wot at the bottom of the swells so as to get over them !
http://i235.photobucket.com/albums/ee20 ... 010072.jpg

Meat & Patatoes now thats what its all about baby !
http://i235.photobucket.com/albums/ee20 ... 010071.jpg

J

[delevi]

John, Did you scratch off the "2" in front of the "75"? That puppy is MASSIVE! I remember when Geoff was aboard and I floored the throttle from a standstill position. For a second, his eyes popped open wide... Then he was relieved as the boat gently accelarated. He says "Dude! If I did that on my boat, you would have fallen out." I guess 1600 CCs will do that vs my little 890 cc 50hp etec.

I think a diesel OB would be awesome, if it could deliver the same performance. Imagine the fuel savings. I would guess 3x vs gasoline.

Leon

[Rick Westlake]

Now I got ALL you beat…and SA can eat my wake too!!

I recently acquired a used General Electric S5W SSBN Reactor from the NAVAL SRP program.
It has at least 7 years left before refueling.
(Sorry...long boring day at work)

You'll need an extra-high-flotation lifevest to make up for the lead-lined jockstrap, won't you?
But you may be restricted to sailing the Columbia River - within the boundaries of Hanford.

[bubba]

That is my line.

But you may be restricted to sailing the Columbia River - within the boundaries of Hanford.

Out here at Handford on the Columbia River we would welcome a nuclear powered Mac , Who knows It may be using some of the nuclear fuel I used to design.

[Kelly Hanson East]

Dont forget the 'eject the warp core button'

[c130king]

I will see your S5W and raise you a Dilithium Crystal powered Federation Warp Drive:

http://memory-alpha.org/en/wiki/Dilithium

I figure if I can get past Warp 9 I can do the "time warp" thing and go back in time and start sailing even earlier in my life than I did.



Cheers,
Jim