carburattors

[Farmer DaveParticipant @farmerdave]

Hello all ,I've built a few 1 cylinder 2 cylinder & a 4 cylinder 4 stroke engines & ran them all on vapor type carbs which works well enough for demo purposes but they don't have much power . The engine i am working on at the moment is about 20cc.I want some usable power and a throttle on this one. I have bought plans for a MM carb by W Tomkinson from My Hobbies Store, has any one out there built this one.is it a good one. Maybe i would be better buying a ready made one . All comments much appreciated.

[Farmer DaveParticipant @farmerdave]

[JasonBModerator @jasonb]

Malcom Stride's carb that he uses on the Lynx and the recently described Bobcat/Jaguar should be suitable for that size engine and I've also seen it used on a Hoglet V-twin which are 15cc, 15/7.5cc and 25cc.

 

J

Edited By JasonB on 22/09/2013 13:53:38

[Sub MandrelParticipant @submandrel]

Edgar Westbury's carb for Kiwi (15cc) is a little work of art, it even includes a float chamber.

Neil

[Farmer DaveParticipant @farmerdave]

Hi all sorry I've been so slow thanking you for your advice. I decided to build the Tomkinson carb as I had the drawings, it proved not very successful. I have just finished Gerry Howell's 2 needle throttle ,it's doing the business just fine, although it is very small and more intricate than I am used to. Thank you for your help again, It's much appreciated.

[Farmer DaveParticipant @farmerdave]

Hello bogs Just been on ebay ,see what you mean about price, would even the smallest not be to large and out of scale for a model engine. Gerry Howall's one measures 17mm x 17mm for the block with adjustment screws sticking out from it. I am very reluctant to buy anything I can make myself, that's why I started model engineering, its part of the challenge. I make everything I can although I draw the line as regards the ignition & electronics.

[JasonBModerator @jasonb]

If you are going to buy a carb then for that size engine look at a RC carb, does not have to be OS, one of the far eastern copies will do and cost a bit less than Bogs size which is a bit more than slightly larger at 140cc engine not 20cc

 

The Firefly that was in ME about a year ago has a simple carb that works well, The builder used it to fly a RC plane, have a look at my build to see whats involved, plans are on the net.

Edited By JasonB on 13/10/2013 07:04:44

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