Me and my dad installed a twin engine set up on a 16 foot sea swirl using two 20 hp evenrudes same year same model. My dad went down to the marina and ordered a reversed prop for one of them so that when installed one was actually running in reverse and getting thrust in the right direction as the other 20 hp, this way they would not rob from each other at max speed which resulted in a nearly 25% more thrust . Result was that the boat would pull away from our flat bottom boat with a 50 hp mercury .
Awesome video! Hey how do you control throttle on both? Do you just use one as a booster? Or does it lock into speed? I've only owned inboard looking at a 14' with a single 9.8hp. Want to buy a additional 9.8 and hook it up like you did.
I just have to twist the handle on both engines but they hold that throttle setting once you set them. I am sure you could find a way to tie them together I just have not yet.
Yes you can. I ran a 10 and an 18 both johnson in the 50's on a 15ft Crestliner Voyager. Dad ran a 7.5 with the 18. We had a dual control box two shifters and two throttles. In the late 70's I swapped all the motors for a new 25. Two seasons later it quit about 2 miles off Lamoine Beach, East of Mt Desert Island(Bar Harbor). Never will I ever go single engine again.
Just watched it with sound! Girlfriend is asleep next to me...I didn't want her to hear what I'm cookin up!!!!!!!! Always good to have a dad who can machine things for you!!!!
Looks like a nice mod and very fun humm across the lake as well.
It really does make a sweet sound!
That is so goddamn baddass man. Following the build for sure.
Me and my dad installed a twin engine set up on a 16 foot sea swirl using two 20 hp evenrudes same year same model. My dad went down to the marina and ordered a reversed prop for one of them so that when installed one was actually running in reverse and getting thrust in the right direction as the other 20 hp, this way they would not rob from each other at max speed which resulted in a nearly 25% more thrust . Result was that the boat would pull away from our flat bottom boat with a 50 hp mercury .
Dang that’s pretty sweet!
“It is a pain in the butt to run both motors”…also a PIA to get stranded if you only had one motor!
😂 I like adventure!
Personally our troller will take us about 2.5-3 mph on a clear day
Your baseball cap must be glued to your head!!
It works
Great video! You need to put a 15 carb on the 9.9 so they will both turn at the same rpm. The 15 produces about 1000 to 1500 more rpm than the 9.9
Thank you!
@@Marcs_TV maybe look for a 15hp carburater then the 9.9 will be a 15hp. those 9.9 engines are actually 15hp with smaller carburater.
Wow that was awesome I have the evenrude 2.5 where did you get the rod to tie them together
McMaster-Carr
Awesome video! Hey how do you control throttle on both? Do you just use one as a booster? Or does it lock into speed? I've only owned inboard looking at a 14' with a single 9.8hp. Want to buy a additional 9.8 and hook it up like you did.
I just have to twist the handle on both engines but they hold that throttle setting once you set them. I am sure you could find a way to tie them together I just have not yet.
Nice build planning on doing sumg similar
I got twso motors as well a 15 hp and a 25 hp both Johnsons Maybe Im crazy but hey I cant help but wonder if I can get them to work. crazy Jimmy.
You can do it!
Yes you can. I ran a 10 and an 18 both johnson in the 50's on a 15ft Crestliner Voyager. Dad ran a 7.5 with the 18. We had a dual control box two shifters and two throttles. In the late 70's I swapped all the motors for a new 25. Two seasons later it quit about 2 miles off Lamoine Beach, East of Mt Desert Island(Bar Harbor). Never will I ever go single engine again.
Sweet
Thanks.
Awesome! where did you get the aluminum brackets? Do you remember what the shaft was referred to at McMaster?
Just watched it with sound! Girlfriend is asleep next to me...I didn't want her to hear what I'm cookin up!!!!!!!! Always good to have a dad who can machine things for you!!!!
my dream boat
Looks like your cruising right along what speed
You really ought to save some women for the rest of us
Dang ok.
I have one 60 hp and 2 in number 30 hp engineering. Can I fix them.
Difference between the 9.9 and 15hp is the carburetor.
Yes
@@Marcs_TV easy to get 30hp on your rig😁
Shhhh I haven’t done that 😉
@@Marcs_TV 🤣🤣
Carburetors may be the same but one still has a little more kick to it.
Trying to do the same thing. McMaster-Carr . Can't find the correct site. Any help on getting to the right page will be appreciated.
I went to look for the parts we used myself and the website is difficult to use. I will see if I can try again and get you a link!
McMaster Carr
www.mcmaster.com/98804A031/
www.mcmaster.com/6058k74/
www.mcmaster.com/92673A128/
Sorry it took so long to respond.