ESE's works engine tuner

[TZ350]

How did I get such a "wonderful gloss" on my legs and would I be "stand off" ish if you made an assumption? Ok I knew it was a mistake to be in the photo’s...

No the gloss on the engine is from the new paint, didn’t run the bike long, just up and down the drive once, to many people about watching.

It was satisfying to see them scatter as I approached on the return run, it was like chasing chooks.

I hope to get a good look at it tomorrow night, when I will have time to figure if the flat spot is throttle position or rpm related.

[richban]

I am starting to get my head around your idea more. What I don't understand is the blow off valve! If it opens up when a strong pluse wave is sent through would that not defeat the volume calculations. What does it do. I was reading back and can't find the reason for it. I might be missing something obvious here (happens quite a lot) but what does it do?

[F5 Dave]

I can't see the pressure being enough to open it even if there wasn't a convenient hole at the front of the cases, it would have to be a hella amount of gas inertia to overcome just backflowing out the carb, it isn't a diode.

[richban]

I can't see the pressure being enough to open it even if there wasn't a convenient hole at the front of the cases, it would have to be a hella amount of gas inertia to overcome just backflowing out the carb, it isn't a diode.

Still don't understand why its there.

[F5 Dave]

Well clearly this is going to be more efficient than a turbo on full boost, so when it gets to about 14psi it will have to release the pressure so you don't get detonation, + the gearbox is probably only rated to 36hp.

[richban]

So you don't know ether!

[F5 Dave]

I was under the impression it was there for looks.

[Yow Ling]

I was supprised the valve cover wasnt made from copper with extra finning on top.

Isnt it there to stop the cases bulging .out after the explosion ?

[Buckets4Me]

I am starting to get my head around your idea more. What I don't understand is the blow off valve! If it opens up when a strong pluse wave is sent through would that not defeat the volume calculations. What does it do. I was reading back and can't find the reason for it. I might be missing something obvious here (happens quite a lot) but what does it do?

you guys are funny
it's there just incase it all goes boom
then the boost pressure will be a tad more than 14 psi
and we dont want it to reck the cases
so something has to go pop

give you three guess why his leg has no hair on it

[Buckets4Me]

I was supprised the valve cover wasnt made from copper with extra finning on top.

Isnt it there to stop the cases bulging .out after the explosion ?

yep you got it in one
go buy yourself a chocklate fish

as for the copper cover I think he is off to the scrap guy this afternoon

[TZ350]

Isnt it there to stop the cases bulging .out after the explosion ?

Yep that's it exactly.............

[TZ350]

What I don't understand is the blow off valve! What does it do. I was reading back and can't find the reason for it.

Thank you for your interest in my project.

The blow off valve is there because there are any number of reasons that a 2-Stroke engine will back fire, not all of them happen when the carb is wide open......

having the CDI discharge when you turn it's power off is one of them....

"BANG"........fawk...think I just shit myself...is better than a backside full of shrapnel..

.

[richban]

Yep that's it exactly.............

there are any number of resons that a 2-Stroke engine will back fire, not all of them happen when the carb is wide open......

having the CDI discharge when you turn the power off is one of them......

Will you screw it down tight now it is going?

I spent this afternoon playing with intake length and airbox volumes on my bike. I had 4 different trumpet lengths to try 16mm 35 60 and big old 120mm the engine would not run past half throttle with the 120 and the 60. The 35 seemed to work ok but had some reversion around 3/4 throtle, the 16mm was the ticket as expected. The calculations matched the practical design. But what surprised me was that the difference in engine performance with such a very small volume / length change. Then I put a 1 liter airbox on it and back to square 1. Trying a 2 litres tomorrow night.

[TZ350]

Interesting to watch your progress with the intake and how such a small change in length makes such a real difference

[TZ350]

Will you screw it down tight now it is going?

No no...just tight enough to keep the pressure in, lose enough to protect the motor from backfires...a bit of try and see

Might use a better looking boy racer blow of thing later.