ESE's works engine tuner

[craisin]

is the magnifying glass to find the glasses when you lose them.
with me the $2 shop is just down the road.
and I find the old one after I bought some more

[TZ350]

Ok, Looked at the head again very carefully. Matched all marks up top to bottom, all mechanical damage, no signs of detonation.

SS90 if you want to explore the copper detonation thing further, make a copper fin of your own, it's easy enough. But don't forget to tell people you saw it here first!

Time for me to settle down with a good book:- Gordon Blairs

"The Basic Design of Two Stroke Engines" 41MB PDF, it takes a while to load:-

http://sauvegarde.cerbernetic.com/Ma...1560910089.pdf

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[TZ350]

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The Relationship Between Port Shape and Engine Performance for Two-Stroke Engines

Document Number: 1999-01-3333
Date Published: September 1999
Author(s):

Hisatoshi Kinoshita - Yamaha Motor Co., Ltd.
Yuh Motoyama - Yamaha Motor Co., Ltd.

Abstract: Measurement using a three-dimensional anemometric tester was made for the gas flow inside the cylinder of a two-stroke engine while the shape of the transfer port was modified. The relationship between port shape and engine performance was investigated for various factors that characterize the flow in cylinder. In this paper, we focused mainly on two engine running conditions: the maximum output at 11,750 rpm and the output at 10,000 rpm. As a result, we found that the maximum output is most related to the tangential inclination angles of the main transfer port and the inner vent radius of the main transfer duct.

This paper can be read/printed here:- http://www.2stroke-tuning.nl/media/pdfjes/porting.pdf

In case you missed it earlier. Here is a little bit of a gold mine:- http://www.2stroke-tuning.nl/media/

Port maps etc, some of its in German.


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[Yow Ling]

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In case you missed it earlier. Here is a little bit of a gold mine:- http://www.2stroke-tuning.nl/media/

Port maps etc, some of its in German.


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The gold mine is great, good find

[TZ350]

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Walter Kaaden on developing the racing MZ with which the Suzuki GP125 has many similarities.

“Kaaden says that to be fully effective the squish band on the cylinder head
should have no clearance. Otherwise it creates what he calls ‘dead space’.
But he found that "at high revs the dynamics of the piston pushes the crown
beyond the original limit. So you must have clearance.”

The rest can be read here:- http://www.mcinternet.dk/asp/debat/d...p?msgID=247634

Its what I have been able to do.
Set up the piston clearance so under dynamic conditions there is no "dead space", just like Walter Kaaden.

Tuners now know that some dynamic clearance is often necessary to get the correct MSV (Mean Squish Velocity), but it is optional just as having no "dead space" is optional.

Its all in how you choose your compromises on the day.


Does anyone know if Walter had a dyno?

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[Buckets4Me]

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Does anyone know if Walter had a dyno?

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yes he did

it was sowen into the back of his pants

[SS90]

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Does anyone know if Walter had a dyno?

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Of course he did..... how else would they (MZ) been able to claim the rights to breaking the 100 H.P per liter title with a 13 H.P 125cc in 1954.....It wasn't using an "ass Dyno!"

[TZ350]

Of course he did..... how else would they (MZ) been able to claim the rights to breaking the 100 H.P per liter title with a 13 H.P 125cc in 1954.....It wasn't using an "ass Dyno!"

Wooops, the Walter Kaaden artical intro is in Dutch the body is in English:-

http://www.mcinternet.dk/asp/debat/d...p?msgID=247634

Yes he must have tested it on a dyno later, but I think all his early work was done without one.

More from the Walter Kaaden artical:-

"Working out the exact details meant years of painstaking experiment for
Kaaden and his team. With only basic facilities and no additional funds,
every change had to be assessed on the track. Fixing exhaust pipes with
spring clips was originally an MZ idea, a quick way of replacing any number
of variations of exhaust system.
"Later we had an oscilloscope for measuring the pressure of the wave going
down the exhaust and back," recalls Kaaden. "Earlier it might take 50 or 60
attempts before we arrived at the right answer. Afterwards it was only
necessary to have four or five attempts."

Of course he did..... how else would they (MZ) been able to claim the rights to breaking the 100 H.P per liter title with a 13 H.P 125cc in 1954.....It wasn't using an "ass Dyno!"

known mass, acceleration and time over a measured distance. Anyone can do it, no optomistic dyno's involved.
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[F5 Dave]

Here is a fairly recent picture of Kaaden. This morning she said Meow, mumbled something about thermodynamic systems & scarfed some biscuits before finding a sunny spot to nap.

[SS90]

known mass, acceleration and time over a measured distance. Anyone can do it, no optomistic dyno's involved.
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Yes, I have to agree, some Dyno's really do show some optimistic results, and (to a certain extent, price is not always a guarantee of quality, and accuracy)

I have personally inadvertantly caused strange readings by having the data box too close to the RPM inductive pick up (causing the correction factor to defuault to 80 Deg dyno room temp), making the correction factor read strange. (see attached pic)

Correction factor 1.136, and ambient air temp 80 Deg...... I DON'T THINK SO!

As always, it's important to have a good dyno operator (with good data to reference from.)

I don't mind using Dos based dyno's with no Correction factors, the numbers are somewhat absrtact, but if it is well maintained, they seem to read consistently.... A few years ago I know that a dyno was tested (when it was built) using a particular bike, the bike wasn't used much, and 5 years later, when retested (unchanged) the curve was EXACTLY the same, right down to the H.P

Good for developing in my book!

That said, with technology now, and a clever programme writer (and experienced operator), all "bugs" seem to be a able to be over come.

[SS90]

known mass, acceleration and time over a measured distance. Anyone can do it,
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Of course, that will only give you torque, but yes, it's the basics!

[Buckets4Me]

Of course, that will only give you torque, but yes, it's the basics!

so we know how to get torque (known mass, acceleration and time over a measured distance.)

now how do you get horse power (whats the maths)

in my maths book it had a horse lifting a weight. cant remember the figues involved thow ?

just whant to know the maths ???
is it something like Torque /mass over time or there about's ????

[TZ350]

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Of course, that will only give you torque, but yes, it's the basics!

............1/4 mile standing start.


Calculate HP From ET and Weight

HP = (Weight / ((ET/5.825)^3))



Calculate HP From MPH and Weight

HP = (((MPH / 234)^3) * Weight)



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[TZ350]

Calculating Horsepower from Quarter-Mile (or any other measured distance) Elapsed Time and Speed

You can also calculate your horsepower from quarter-mile passes (or any other measured distance).

There are about a zillion horsepower calculators online, and almost all of them are based on a simple formula.

It's as simple as elapsed time divided by 5.825.

That result is cubed (multiplied by itself 3 times) then the vehicle weight is divided by the result.


Just like Walter Kaaden, this is how Thomas has been developing the bikes.


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[bucketracer]

Of course he did........It wasn't using an "ass Dyno!"

From TZ's post:- http://www.mcinternet.dk/asp/debat/d...p?msgID=247634

"Working out the exact details meant years of painstaking experiment for
Kaaden and his team. With only basic facilities and no additional funds,
every change had to be assessed on the track. "

Now we know Walter did not have a dyno, or not in the early years.

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