Upshur "T" head marine engine

[el gringo]

Very interesting Scott. I’ll have to give that a try as well with my next build so I’m not constrained to the usual out-of-scale NGK plug.

thanks for the info!

John

you can also buy 'machinable' ceramic in rounds...you can heat treat after machining if needed...the piece I played with was 1/2"x12". round.
Raym

 

[L98fiero]

you can also buy 'machinable' ceramic in rounds...you can heat treat after machining if needed...the piece I played with was 1/2"x12". round.
Raym

Ø3/8 x 6" Macor good to 1000°F is about $40 at McMaster Carr, you can machine it with high speed steel though carbide obviously lasts longer. It also chips and breaks easier than Corian.

 

[gg89220]

hello
engine finished

 

[Brian Rupnow]

The more I see of that engine, the more I like it. ---Brian

 

[gg89220]

hello
video

 

[a41capt]

That’s a great running engine! Very nice, thanks for the video. I enjoyed the build, and seeing the results is the icing on the cake.

John W

 

[awake]

What type of carburetor is on this engine?

 

[a41capt]

It appears that the needle valve goes straight through the throttle “plate” (barrel) to the main jet aperture. Really unique idea for a small engine, and one I considered for my Webster before just tossing in the towel and buying an RC carb.

John W

 

[gg89220]

it is a rotary bushel

 

[awake]

It appears that the needle valve goes straight through the throttle “plate” (barrel) to the main jet aperture. Really unique idea for a small engine, and one I considered for my Webster before just tossing in the towel and buying an RC carb.

John W

Actually, I've seen a couple of designs on this forum that do this. I think one is originally by George Britnell, and at some point Brian Rupnow drew up a set of plans. I also recall Brian making a set of drawings for a "JAG" carburetor - not sure if that was his own design or not. So far I've only done the very simple but quite usable Chuck Fellows carburetor.

it is a rotary bushel

Is that a DIY design? I did a little searching but haven't found it (yet).

 

[gg89220]

hello

 

[a41capt]

Very nice!

 

[Brian Rupnow]

The Jag carburetor is a Malcolm Stride design. His original was in metric, I redrew it in inches. It does work very well.---Brian

 

[ShopShoe]

I like that engine, both in looks and in sound.

Congratulations and Thank You for posting,

--ShopShoe