ESE's works engine tuner

[Martin1981]

Momentarily it is being fed by a 50 mm Bing carburettor. Not because it's such a fine instrument, but simply because it's the biggest carb available.

Frits, as far as i know there are 58mm carbs made by lectron. but i think for 700ccm this is still too small. and the big lectrons are very expensive.

[Frits Overmars]

Frits, as far as i know there are 58mm carbs made by lectron. but i think for 700ccm this is still too small. and the big lectrons are very expensive.

Expensive is relative if you're going for a world championship. But don't tell them; I don't want them to go in that direction; I prefer injection.
Or maybe they just need a bigger pipe .

[jasonu]

http://articles.superhunky.com/4/52
https://www.youtube.com/watch?v=-GiRtQZlnbw

[Martin1981]

wow, this is a good photoshop job! or is this pipe really real?

Frits, another question regarding the crankcase volume....

you said that when using the 24/7 inlet one will have to use a really big crankcase. on the pictures of the modena engine of Roland Holzner you posted once, the crankcase does not seem to be very big. have you talked about that with Roland and did he tested out that it works with a small crankcase also?

[F5 Dave]

A friend of a friend has a Zabel too.
Attachment 308583

This is a power curve of a Zabel Engine. I do not know which type of engine it is exactly.
The lower curve is "as it is", the upper curve is with NOS injection.
I think a good point to prove Frits argument about the bigger carb in need :-D

So the question would be - why in the world would someone put nitrous oxide in such a monster?!
Because the shovel tire needs such an amount of power to crawl up the mountain
Attachment 308584

You'd want to ride that side-saddle so you had half a chance of jumping clear if (when) it loops over and impales you.

[peewee]

this is my ktm550 92x82 that uses methanol. it has cr500 rod (can see 4mm spacer under the cylinder) and fuel pump mounted in the airbox. space was limited so you mount things where ever you can . i have a ktm 500cc 89mm barell that im going to put on and use a cr500 piston for 89x82

[F5 Dave]

http://articles.superhunky.com/4/52
https://www.youtube.com/watch?v=-GiRtQZlnbw

Thanks for posting
I had heard of those, reading the article I still couldn't help wonder if it was an elaborate send up knowing the authors other work.

[peewee]

wobbly on that aluminum welding brazing rod. just ordered 3 different brands to try. im hoping it will do the job for these aux tunells. anyways i read it doesnt stick to steel. thinking maybe i can put some steel plugs in there and weld over the top then pull the plug out. you ever did anything like that ?

[wobbly]

Dont know about steel, but I have alloy tig welded around brass before with no problems.
I know others have tig welded on the Ex floor on cylinders right up to the sleeve.

[Larry Wiechman]

Carbon can be used as a "core" when welding with aluminum filler rod. Easy to shape and remove after welding. Check with plastic mold tool shops for EDM electrode material.

[husaberg]

Frits, as far as i know there are 58mm carbs made by lectron. but i think for 700ccm this is still too small. and the big lectrons are very expensive.

53mm at least well I never knew that anyway...by the wording it looks like they may even go bigger to special order.

Lectron 50-53mm Power Jet Pro carburetor

The Lectron 50mm- 53mm Power Jet Pro carburetor is the ultimate for large air flow requirements. This carburetor has been proven as the leader from NHRA Pro Stock Motorcycles, UTV & AVT Racing, Snowmobile Racing and so on…..
This Carburetor comes completely set up with Billet Bell, Billet Bowl and all machining mods!

Price: 50mm $625.00 each
http://www.lectronfuelsystems.com/ca...arburetor.html
52mm and 53mm $775.00 and up.

[peewee]

Carbon can be used as a "core" when welding with aluminum filler rod. Easy to shape and remove after welding. Check with plastic mold tool shops for EDM electrode material.

ah yes why didnt i think of that. we use carbon blocks at work when welding against rail tracks. im not actually the welder but ive worked with them and seen how they do it. that stuff is pretty soft and could be easily grinded to the desired plug shape then easily grinded out for removal. hek they probly got a old chunk i can take home

[Frits Overmars]

Frits, as far as i know there are 58mm carbs made by lectron. but i think for 700ccm this is still too small.

The '50 mm Bing' was a typo; actually it's 55 mm. And you are right, it's a bit on the small side. If we were to go for all-out power, the standard Zabel should have a 65 mm carb and the projected new engine a 71 mm one. But maybe it is wise to not go for all-out power...

[Frits Overmars]

Frits, you said that when using the 24/7 inlet one will have to use a really big crankcase. on the pictures of the modena engine of Roland Holzner you posted once, the crankcase does not seem to be very big. have you talked about that with Roland and did he tested out that it works with a small crankcase also?

Roland has one huge handicap: the rulebook. The carburettor diameter is restricted to 30 mm. That of course influences all other dimensions in his inlet system.
A second handicap is that none of these kart engine manufacturers has unlimited funds. Roland had to avoid upsetting the beancounters so he worked with what he had.
Besides, even if money would not be an obstacle, Kart engine manufacturers cannot change an engine at will because of homologation issues.
Rolands primary goal is to get his fuel injection approved, which won't be easy because he already rubbed some stone-age officials up the wrong way with the synthetic inlet inserts in the present Modena engines. These were homologated all right, but subsequently the officials let Modena know that these inserts won't be accepted in future engines. Why? All I can think of is envy.

[adegnes]

I can understand why air cooling is appealing to some... Not a looker!


Speaking of lookers, here's a shot with the dweeb mounted.

Would fabricating a more aerodynamic "racing seat", one that takes over where my back ends, make any noticable difference? We're not talking face melting speed here, hopefully around 130-140kmh.