Post pictures of your engines!

[Swede]

That is awesome... It's got to be tough to get nice, smooth running at such an RPM!

Great job!

[bluejets]

Just posted a couple of videos on youtube of the 4 cylinder boat engine.
One is much clearer than the other.
I found out that it was better to remove power from the glow plugs after the engine had started and you will hear a big difference in the top end speed.

[nomedia="http://www.youtube.com/watch?v=hXdLRe_MWI8"][FONT=Times New Roman]http://www.youtube.com/watch?v=hXdLRe_MWI8[/FON"]400 Bad Request[/FON"]400 Bad Request[/nomedia]

When it opens there is a section "2 videos" to see the second one

[stevehuckss396]

Great project. I have been looking for something to put a 1/5th scale V8 into. Maybe I should look at boat plans.

[bluejets]

Great project. I have been looking for something to put a 1/5th scale V8 into. Maybe I should look at boat plans.

Boat plan I used was from a full scale set I found on the internet. Downloaded in A4 format and then kept blowing them up a bit at a time until I came to the size I needed.

RunaboutsInboard riviera

[skmetal7]

own design, 3 cylinder, sleeve valve. I think my carb is wayyyyyy too big though, keep flooding it. will try a smaller carb, not sure what size though.... maybe look for a single cylinder .35Cu In engine and get a carb similar in size.


.746" bore, .800" stroke (.35 Cu In per cylinder), 10-40 spark plugs. electronic ignition.

"http://www.youtube.com/watch?v=vaTR0FUeK5c"]CIMG4217.AVI - YouTube

[dsquire]

Great project. I have been looking for something to put a 1/5th scale V8 into. Maybe I should look at boat plans.

Steve

Have you given any more thought to putting one of your V8's into a boat now that you re close to having them finished?

Cheers

Don

[Mago]

Hi guys,

Some pics of the completed Offenhauser model, plans by Ron Colonna.
Took almost 2 1/2 years to build and if I had studied the plans more carefully would have realised that it's a very complex bit of machinery, especially in this scale.
Cam box covers removed to display cams.

It is set up to run but might end up as a desk top display.

Mago

[bluejets]

own design, 3 cylinder, sleeve valve. I think my carb is wayyyyyy too big though, keep flooding it. will try a smaller carb, not sure what size though.... maybe look for a single cylinder .35Cu In engine and get a carb similar in size.


.746" bore, .800" stroke (.35 Cu In per cylinder), 10-40 spark plugs. electronic ignition.

You might be surprised how small you can go with carby size. When smaller, the engines tend to behave themselves much better. Try something from a .10cu in motor. The 4 cylinder inline engine I built (above) 25cc runs on homemade carby with a 2mm venturi and it will run to 10,000rpm.

[skmetal7]

You might be surprised how small you can go with carby size. When smaller, the engines tend to behave themselves much better. Try something from a .10cu in motor. The 4 cylinder inline engine I built (above) 25cc runs on homemade carby with a 2mm venturi and it will run to 10,000rpm.

hmm, interesting. So start small, then work your way up. How would a small carb affect RPM? and how did you figure out the carb size for you engine?

[bluejets]

Quite simple really.....experience....I've done it before and like you, I had size too large. i.e. engine was cranky to start, run and adjust. Fuel draw was poor also. So I cut back until it worked properly. If you look at the design of the carby they use on the V4 Howell engine you will get some idea. I have built one of the Howell carbies and with the idle bar and the main jet bar in the venturi, even I wonder if there will be enough airflow. But it works on the original V4 so there you go.

The Howell V-4 IC Engine Project

Howell 2-Jet Throttle