ESE's works engine tuner

[Frits Overmars]

From a gasdynamical point of view it's a pulse-driven system alright. But from a mechanical point of view it's an engine-driven contraption. There may be classes of racing where a Comprex is legal; I don't know. But from what I understand, they are generally thrown in one lot with turbos and mechanical blowers.

So if I run a mechanical rotating drum, say, in a twostroke exhaust port one to one with the engine then that would deem the engine supercharged?

Not in my book. But hey, I'm not an official anymore. Nowadays, chances are that they'll throw the book at you if you find some extra power.
And if they can't find a relevant book, they'll write a new one overnight. That's promoting technical development. And that's the main reason I resigned.

Frits idea of blowdown direction is probably OK - but while I'm a known rules mechanic, I wouldn't swear to it's legality...
As I remember it, the FIM banned water injection into exhaust pipes as it could have reached the combustion chambers.

I didn't even know that water injection got banned Grumph. You sure?

Controversial porting tool...

Alex, if you use tie-wraps on hand tools, the sharp cut-off ends can be annoying. But you can avoid that by using a nail-clipper instead of a pair of cutters.

Your idea reminded me of a tool I saw on www.langtuning.de

[WilDun]

Crap, I get it now... That's the hardest thing with a different language, picking up the jokes...

Don't worry, the joke probably wasn't the best anyway!

[adegnes]

Alex, if you use tie-wraps on hand tools, the sharp cut-off ends can be annoying. But you can avoid that by using a nail-clipper instead of a pair of cutters.

Your idea reminded me of a tool I saw on www.langtuning.de

Nice tip!
Those look to be a bit further into the refinement stages than mine currently is...

[Grumph]

I didn't even know that water injection got banned Grumph. You sure?

No. What I remember is reading in an issue of Motocourse annual that a sidecar team had been trying it with some apparent success. They stopped using it as I remember because they were told it was of dubious legality. The writeup mentioned that the FIM had now closed that loophole.

It is possible of course that when 2 strokes were dropped from the roadracing GP classes, the relevant rules were deleted too.
Our rulebook here in NZ has lost a load of rules that were there for good reasons - and when they've been dropped, no one has been advised.

[adegnes]

I visited www.langtuning.de, thinking the tool could be a cheaper alternative to other "professional" porting tools.
Guess not, 419€. It might be worth it, but that's too steep for me.

[breezy]

Im in tears..very funny adegnes

[adegnes]

Your idea reminded me of a tool I saw on www.langtuning.de

Wonder what kind of "chuck mechanism" they use on those tools?
Are 3mm ID timing pulleys with set screws available? Can't find any on ebay.

[jonny quest]

How would you hold that tool? I don't know about you guys... but I hold my right angle grinder right where that belt is

[Flettner]

pinched my design
Actually I don't use this tool much now, just cast new cylinders, get the ports you want without all this fucking around with these sorts of tools. And you never get what you want anyway, it's always a compromise.
I might add, this tool was made up from crap lying around in the workshop, bit's of an old photocopier (I knew that photocopier would come in handy one day) if I remember right.

[wobbly]

Is that the new heat radiating green slime ceramic coating, you have been developing for air cooled cylinders I can see Flett.

[Flettner]

Is that the new heat radiating green slime ceramic coating, you have been developing for air cooled cylinders I can see Flett.

It's called 'organic green', just leave it outside under the lemon tree, works every time.

[jasonu]

pinched my design
Actually I don't use this tool much now, just cast new cylinders, get the ports you want without all this fucking around with these sorts of tools. And you never get what you want anyway, it's always a compromise.
I might add, this tool was made up from crap lying around in the workshop, bit's of an old photocopier (I knew that photocopier would come in handy one day) if I remember right.

Buckets at its best!!!!!

[senso]

If you have some patience you can also buy a dental 90º on ebay for 20-30€, the respective hose for a couple € and 10 boxes/50 burs for another 10-12€ and have some sweet miniature burrs do dig around ports with a lot of control.
I bought a LOT of them, and still have a couple of them lying around, and yes, they wont cut as fast as a single flute 30mm carbide burr strapped to a 5KW endmill, but they get the job done, put some 2 stroke oil into the hose, give it 1.x bars and re-oil every 30 minutes.
Those use 1.2mm shaft burrs..
Will cut nicasil coated alu and cast iron cylinders/liners with ease, and they dont vibrate a thing, and are more or less silent when compared to a dremel or any big-ish air power tool.


For 3mm burrs for dremel like cutters you have the bigger ones called contra-angle dental handpieces, more or less the same as above.

I can throw a couple links into the post so you guys get the idea.

[jonny quest]

http://p.vitalmx.com/photos/forums/2...0_IMG_9260.jpg

[adegnes]

If you have some patience you can also buy a dental 90º on ebay for 20-30€, the respective hose for a couple € and 10 boxes/50 burs for another 10-12€ and have some sweet miniature burrs do dig around ports with a lot of control.
I bought a LOT of them, and still have a couple of them lying around, and yes, they wont cut as fast as a single flute 30mm carbide burr strapped to a 5KW endmill, but they get the job done, put some 2 stroke oil into the hose, give it 1.x bars and re-oil every 30 minutes.
Those use 1.2mm shaft burrs..
Will cut nicasil coated alu and cast iron cylinders/liners with ease, and they dont vibrate a thing, and are more or less silent when compared to a dremel or any big-ish air power tool.


For 3mm burrs for dremel like cutters you have the bigger ones called contra-angle dental handpieces, more or less the same as above.

I can throw a couple links into the post so you guys get the idea.

I haven't tried the air-driven variety of the ebay dental tools yet, sounds like they hold up better than the electric version that just crumble in your hands...

Back on the dyno!... And the struggle continues...
https://www.youtube.com/watch?v=B9b2RutjK7U