Durbans Johnsonator outboard motors .

[classiccat]

Re: Durbans Johnsonator outboard motors .

MOST IMPRESSIVE!!

Have you considered running the fan off of the flywheel? ...if the crank is turning, the fan is as well. I'd probably add some sort of wheel speed sensor (hall-effect or an encoder) to the fan that cuts the engine if the fan stops.

 

[phillnjack2]

Re: Durbans Johnsonator outboard motors .

If he ran a fan off the flywheel it would be going old style like old cars,they take too long to get warmed up,
with the electric fan and a thermo switch the engine stays at a desired temp a lot better and is quicker to warm up.
Yes it uses power to make the fan go, but by having a driven fan from the flywheel would consume more
power due to being in use 100% of the time, that = more power consumption,more wasted fuel as well.

In todays cars/trucks we see the electric fan has completely taken over from the belt driven fan, it has proved to
be more efficient in fuel savings and temperature control.

This is a very good topic, as everyone is now using their noddle and thinking about stuff that should of been in
use a long time ago.


phill

 

[jbjennings]

Re: Durbans Johnsonator outboard motors .

Durban, just looking at the cowl vent and the size of the radiator, I'm worried at full throttle you're going to produce too much heat with too little flow over the radiator due to back pressure from the cowl vent. ALso, what's the hp rating of the radiator?
I think you did a great job shaping the cowl, just worry about the heat. Those 2-strokes make LOTS of heat!!
The sea trial will surely be the test of tests. I'd want some temp. gauges to monitor that water temp, and check it pretty regularly for the first few minutes of WOT running with an IR thermometer for hot spots. I'm sure you already have that in mind, though.
GOod luck,
JBJ

 

[durban]

Re: Durbans Johnsonator outboard motors .

i have checked for back pressure with the cowling on the air flow seems to circulate through quite good & coming out the back of the cowling that opening has been enlarged & also at the front opening , the air does come out a little hot at the rear end due to heat of motor, the front end its cooler , the fan sucks cold air in from the front , the manifold plate i made from one type of material is my plan A , the other manifold plate i made from a different material is plan B , this one drops the temp in the exhaust box by 20 degrees at idle , according to my calculations its a savings of 16.25% , I will run with plan A first , IF the sensors trigger the hooter off , i will change over to plan B , the motor will run without the cowling on at first , if things go well , then it will be fitted on & run again , the first couple of hours the motor will not be run at WOT , This will slowly be introduced ,

 

[durban]

Designed Fresh water Cooling system in New Zealand .Decals to follow on cowling , soon

Some testing from my new radiator motor that I designed.

 

[durban]

Designed Fresh water Cooling system in New Zealand .Decals to follow on cowling , soon

Designed Fresh water Cooling system in New Zealand .Decals to follow on cowling , soon

Did some testing on my new Johnsonator motor.

 

[Faztbullet]

How are you going to cool exhaust tube and housing?

 

[racerone]

Ge said that he had it all figured out.------Need a video of a 20 minute full throttle test on a boat at 50 kilometers / hour.

 

[Crosbyman]

9 years later ??? this better work

 

[F_R]

Shoulda bought an old Eska or Clinton outboard from the 1960's -1970's to see what happens when you blow all that salt air around under the cowling. They also required a water pump to cool the exhaust. Just sayin'....

 

[racerone]

I have a Mac 10 outboard ( not operational ).------Air cooled rotary Wankle engine by ----" Sachs " from Germany and assembled in Italy.-----Paid very little for it.

 

[Scott Danforth]

radiator isnt big enough for that motor under full load

 

[racerone]

Many of us would agree that the radiator does not appear to have enough capacity.-----So we all have to wait for the report on the 20 minute ----FULL LOAD--- testing.

 

[durban]

Many of us would agree that the radiator does not appear to have enough capacity.-----So we all have to wait for the report on the 20 minute ----FULL LOAD--- test

Designed Fresh water Cooling system in New Zealand .Decals to follow on cowling , soon

You see this is a 2006 model 4 stroke block with holes eaten into it by salt corrosion , only one of many more and more to come . in the 1st picture there is a hole between the 2nd and 3rd exhaust port looking from the left . in the 2nd picture you will see a hole in water channel opposite the nut hole .some of us don,t have the money to buy motors every 15 or 20 years or pay lots money to have it fixed . Then you do this. this block is full of salt build up. Use Durbans Desalting formula the 3rd and 4th picture. 4th picture then you use Durbans heat resistance Formula after fixing the holes . My Johnsonator Motor Design will work and save you money.

 

[Scott Danforth]

good luck.

 

[F_R]

Pictures look good.

 

[Sea Rider]

Are you planning to use the green Krypto coolant in a closed recirculating cooling system to cool the motor ?

Happy Boating​

 

[racerone]

I have seen corrosion damage on 4 stroke motors.-----But I politely ask for a test report after a 20 minute run at full throttle of the subject motor !!

 

[ct1762@gmail.com]

its going to melt at WOT from the bottom up. id run it with the water pump redirected to the exhaust somehow