ESE's works engine tuner

[Larry Wiechman]

Come to think of it (I just had my first cup of coffee) we could use a rotating drum in front of the exhaust ports, parallel with the crankshaft, with passages that control which blowdown pulse is going where. That drum could double as a balance shaft.
It wouldn't be quite in accordance with KISS, but I think it would be justified if it would improve power and at the same time enable us to omit three expansion chambers.

The Comprex Supercharger.
http://www.egr.msu.edu/mueller/projects_waverotor.htm

[Frits Overmars]

The Comprex Supercharger. http://www.egr.msu.edu/mueller/projects_waverotor.htm

That would definitely work Larry, but superchargers are forbidden in most branches of motorsport.

[Flettner]

That would definitely work Larry, but superchargers are forbidden in most branches of motorsport.

Is a Comprex supercharger an actual supercharger? It's a pulse driven system, like a chamber and they are not illegal in racing.

[Frits Overmars]

Is a Comprex supercharger an actual supercharger? It's a pulse driven system, like a chamber and they are not illegal in racing.

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.

[Flettner]

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?

[adegnes]

Controversial porting tool...
https://www.youtube.com/watch?v=sCXd0GCtzfo

[wobbly]

Adegnes - So looks like the girlfriend will be getting an extra Xmas present.
For gods sake make sure to remove the file and hell,dont tell her its only been used once.

[adegnes]

Adegnes - So looks like the girlfriend will be getting an extra Xmas present.
For gods sake dont tell her its only been used once.

[Grumph]

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?

Only if the positive pressure wave side was connected to the inlet port(s).
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'm sure someone can clarify that.

[Flettner]

Only if the positive pressure wave side was connected to the inlet port(s).

Yes Grumph, my mistake, I guess I missed that point.

[adegnes]

I have more confidence in this one!
https://www.youtube.com/watch?v=4SyTGIttCw8

[WilDun]

Controversial porting tool...

Way back in the day when men were men (and women were glad of it), we did it manually (by hand) and got on with the job! and we didn't need rum to do it either
We did have crude vibrators though, however they had wheels and handlebars (mainly Suzukis and Kawasakis as I recall)...........and we stuffed a lot of engines too, (lack of lubrication)!

[adegnes]

Way back in the day when men were men (and women were glad of it), we did it manually (by hand) and got on with the job! and we didn't need rum to do it either
We did have crude vibrators though, however they had wheels and handlebars (mainly Suzukis and Kawasakis as I recall)...........and we stuffed a lot of engines too through lack of lubrication!

Have you ever reshaped a set of transfers with bent files before?
Slooooow! Maybe I'm just lazy...

[WilDun]

Have you ever reshaped a set of transfers with bent files before?
Slooooow! Maybe I'm just lazy...

Yes, good things take time and can't be hurried, this could even include things like understanding my humour (read B.S.) - sorry about that!

[adegnes]

Yes, good things take time and can't be hurried, this could even include things like understanding my humour (read B.S.) - sorry about that!

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