ESE's works engine tuner

[WilDun]

I am having a problem getting on to the ESE thread since yesterday - every time I click on to this thread, only the "reply" window comes up complete with quote and that's all - so I can't get the latest posts anymore!
So I have decided to use this reply window (after deleting the quote) so I can find out from someone who can tell me what has gone wrong. -did I press a wrong button somewhere? (maybe I have cured it by doing just that - we'll see).

UPDATE - no I haven't, problem still there every time I reopen ESE!

[tjbw]

I am having a problem getting on to the ESE thread since yesterday - every time I click on to this thread, only the "reply" window comes up complete with quote and that's all - so I can't get the latest posts anymore!
So I have decided to use this reply window (after deleting the quote) so I can find out from someone who can tell me what has gone wrong. -did I press a wrong button somewhere? (maybe I have cured it by doing just that - we'll see).

Don't see any problem here Will, try reboot PC?

[WilDun]

Don't see any problem here Will, try reboot PC?

It was rebooted about half an hour ago but I'll try it again, it'll be my fault somewhere along the line I'm sure, but that doesn't help without my knowing what I've done wrong!

[WilDun]

I'm very uncertain about the transmission loss numbers. The variator/belt/clutch will burn you after a run tho.
I am also trying to draw attention from scooter kids...

Tried logging out, and rebooting but it looks like I'm stuck forever having to answer this post by adegnes (which always comes up first) in order to get on to the thread (which I've just done).

......... but, hang on ...... I'm now getting to the main window by clicking on the "ESE" on the path (top left) in the meantime - that'll do till it's been sorted - somehow!

[SwePatrick]

If needing to compare to any class in dragracing, you should look at Prostock, not Topfuel dragsters.
Prostock is equipped with a slipclutch that locks up with centrifugalforce and a clutchless 5spd gearbox.
But!
Rules differ a bit when having a bike on the strip.
In a car you need to release the clutch yourself.
In Bikedrag they´ve got a similar clutch, but they dont use clutch at all.
They are setting the launchcontrol just underneeth in rpm´s where the clutch engages.
Then releasing the launchbutton the engine speeds up and engages the clutch and for shifting they often use airsystems automated to hit gear in a tuned rev range, this system also cuts the ignition for a couple of ms to get load off the gears.
This allows them to grab the handles good to follow along safely on their short but fast journey

Rgds.

[peewee]

patrick you may find this interesting https://rideapart.com/articles/hondas-secret-gearbox

[husaberg]

Tried logging out, and rebooting but it looks like I'm stuck forever having to answer this post by adegnes (which always comes up first) in order to get on to the thread (which I've just done).

......... but, hang on ...... I'm now getting to the main window by clicking on the "ESE" on the path (top left) in the meantime - that'll do till it's been sorted - somehow!

MR T will sort it for you.

[SwePatrick]

patrick you may find this interesting https://rideapart.com/articles/hondas-secret-gearbox

It´s interesting, but i do not have possibilites to develop this to my racer.
In my case the driver has to hit the shifter faster, then i can shorten ignitioncut time
I have small plans to let Ignitech control a pneumatic valve to bang the gears.
But, i feel that the win might be eaten up by extra weight(airtank,hoses and solenoid).
I got my ignitioncut setup somewhere between 3-5ms at this point.
It sounds almost seamless.

[husaberg]

Have you tried the Mercedes Aux pump, the lads in the uk swear by them
this is possibly a bit heavy http://www.xylemflowcontrol.com/mari...fugal-pump.htm

that heavy one is about 1200 NZD
this one although small output is smaller draw and lighter and made for hot water
http://www.lusty-blundell.co.nz/afaw...ctdetails.html
http://www.condorpumps.com/core/medi...3c7967706d5026

[Frits Overmars]

my bike is a 5-speed 250cc drag bike, max power @ 11000rpm

In karting the 250 engines rev to 11,000 all day

No argument there Wob; I talk to the guy below every now and then . Both the single and the twin in the picture are the current European Superkart champions.
The single produces 72 wheel-hp on regular petrol at a little over 10.000 rpm. This made me say that Magnus might find more power below 11.000 rpm.

You want to get the thing reving to its mechanical limit the whole time, as this affects the speed/rev ratio and thus the torque multiplication of short drive ratios.

Now you've lost me. I would shift up where the speed-wheeltorque curves intersect. In the low gears that may indeed be at maximum rpm, but certainly not in all gears, unless you go racing with a three-speed gearbox.

[SwePatrick]

I have used those single 250´s as a tell tale as what´s possible in my project.
The power i reached is uncorrected 62.16hp(64.71 corrected to SAE std)
I still think i can reach a bit higher as i´m only having 61.1mm stroke(211.6cc)
The peakpower is as we speak at 11730rpm(max rpm is set to 12500)
And if i play with the numbers a bit(and forgets about pistonspeed when dreaming)
62.16hp/211.6=0.2937618hp per cc
Taking that number and multiply it with 249cc i get 73.14hp

Viperengines in UK is reaching about the same numbers also if i remember correctly?

Anybody sitting on a blueprint of a pipe to one of those?
Would love to see how my 5 minutepipe is similar to those.

[Magnus676]

I've searched for both seamless gearbox banshees and karting 250cc singles,but I didn't find much.
Could I have some more information(pics,specs etc) ?

[Frits Overmars]

Drag racers now also use seamless shift gearboxes in Banshees, with a very simple fork/dog mod, Google that.

I've searched for both seamless gearbox banshees and karting 250cc singles,but I didn't find much. Could I have some more information(pics,specs etc) ?

Not a Banshee box (no Banshees around here) but an example of a dragbike transmission.
In a normal gearbox, if two gears are engaged at the same time, the box will lock up and you'll get hurt. But take a look at the shift dogs in this dragbike box.
The shift dogs are beveled at one end. If a gear threatens to overtake a dog ring, the dog ring is simply pushed aside, out of engagement.
Upshifts can be made under full power; no need to cut the ignition or feather the clutch.

[wobbly]

This site has been hideously slow for over a week now, many times it will time out and I get the " cant contact the site " message.
I have tried several times this morning to post this reply, but after several minutes, the reply option still isnt available.

Anyway to answer your query Frits, unless you have the luxury of a DEA or GasGas 250cc single close ratio gear set ( no one with a normal MX 5 speed does )
the big issue is that the rev drops are so huge that many "over tuned " engines will hardly accelerate at all in the upper gears.
If you shorten the gearing, they then overev in the low gears and in 5th the terminal speed is too low.
The only remedy is to do what DEA and Viper do, that is set max power quite low at 10,000 but allow the engine to quite happily overev past 11,000, so
you then drop back into some decent power after an upshift.
The 5 speed MX boxes are little better than the 3 speed you mention as an example, for drag racing or a Superkart.

[Mental Trousers]

Tried logging out, and rebooting but it looks like I'm stuck forever having to answer this post by adegnes (which always comes up first) in order to get on to the thread (which I've just done).

......... but, hang on ...... I'm now getting to the main window by clicking on the "ESE" on the path (top left) in the meantime - that'll do till it's been sorted - somehow!

MR T will sort it for you.

Unlikely. There's nothing wrong with the site. I'm picking it's a virus or some malware crap on Wil's machine.