ESE's works engine tuner

[TZ350]

Checking out the ground clearance on Chambers FZR-GP100. With the springs removed and the suspension completely compressed the tip of the foot pegs just touched at 40 degrees, would have liked it to be 45, but every thing else like chamber and gear/brake levers have much further to go, so no clearance problems there.

[F5 Dave]

So cut the footpegs down, they are touring models currently.

Just use the std RG barrel but weld a plate to it & make a curve, that's what mine is.

[TZ350]

So cut the footpegs down, they are touring models currently.

Just use the std RG barrel but weld a plate to it & make a curve, that's what mine is.

Thanks, good idea's........

[bucketracer]

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PDF of NGK racing plugs here:- http://www.elit.cz/Files/ObrazkyPMod...gplugs_ENG.pdf

[bucketracer]

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We need to make ourselves a dyno..........

[bucketracer]

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OK TeeZee enough with the plenum chamber........plenty of turbos lying around the workshop.........a Jet Bucket is the way to go.

[Pumba]

We need to make ourselves a dyno..........

This has been discussed several times. At the rate ESE develop stuff we should see it in about 2015.

[Buckets4Me]

This has been discussed several times. At the rate ESE develop stuff we should see it in about 2035.

fixed

by the way thats when the grandkids will be getting into it with gusto

[TZ350]

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Finished by 2035, why whats the rush?????...........

[Buckets4Me]

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Finished by 2035, why whats the rush?????...........

Grandkids remember

[Pumba]

Grandkids remember

What yours Karl

[TZ350]

In building a Dyno, we found one of the harder design problems to overcome is the task of reading the RPM from the ignition spark plug lead and this held us up for a while.

The problem is that the ignition output varies with engine load and its amplitude is basically all over the place, with a lot of ringing and electrical noise. So there needs to be a way to get a clean signal with a consistent amplitude and shape that can be read by a computer easily.

SportsDevices show how this can be done with a 555 timer:-
http://www.sportdevices.com/rpm_readings/index.htm

JayCar sell a (Neon Tube Sound Display) kit, KC5221 with a LM555 timer that can be modified fairly easily. Unfortunately the kit can only be brought online from their “Kit Back Catalog”:- http://www.jaycar.co.nz/productResul...=21&SUBMIT.y=5

The spark rate at 12,000 RPM for a single cylinder one spark per rev., 2-Stroke is equivalent to 200Hz, or 200 sparks per second. So the on and off time or width of the output pulse from the LM555 at 12,000 RPM should probably be a 50% duty cycle, 1/400 or 0.0025 mSec so as to get a nice consistent square wave that can be easily recognized by the computers software.

Go here, or check out Pic-04 for calculating the resistor and capacitor needed for “on” time or width of the output pulse.

LM555 Monostable Oscillator Circuit Diagram and Timing Calculator http://home.cogeco.ca/~rpaisley4/LM555.html#3

Pic-01 JayCars KC5221 Kit.
Pic-02 SportsDevices circuit.
Pic-03 a LM555 monostable oscillator circuit.
Pic-04 LM555 timing values.

[Bert]

why not one of these http://www.trademe.co.nz/Browse/List...x?id=293504620
or put a break out lead on your timing light cables (it would produce a voltage spike every spark; which could be easily turned into a frequency; then connected into your computer parallel port.
one would need to make sure you don't put more than 5v up the port (easy fix with a few resisters)...

http://www.epanorama.net/circuits/pa...put.html#input
provides some insight (and code snips), but some quality time spent googling will un-earth what you require to fully build up the required code.
or look for a USB interface option http://www.usbee.com/freqc.html

most simple data loggers would sort out this for you (including the maths) and you could log other parameters like temp etc....

[k14]

If you are using an ignitech you can just hook up to the tacho output i would have thought?

[TZ350]

Hi Bert, lots of interesting reading there, thanks, we want to build a dyno that any small bike can use, so the rpm pickup has to be universal.

k14, I had forgotten about using the tacho output, but that is a good idea. Earlier last year I had downloaded some software that read a tape recording of the ignition and produced a dyno graph, it worked on the inertia principal much like an inertia dyno does. The problem was getting a good recording, but with the taco output it should be much easier if I need to go there again.