ESE's works engine tuner

[ken seeber]

We used to use A390 at Orbital.........many cast pistons are made using this or similar.....T6 of course.

[flyonly]

.
Promised a friend I would gather up all my Suzuki RG50 rotary valve conversion posts into one place.

What the rotary valve housing and cover plate of a Suzuki also?


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[TZ350]

What the rotary valve housing and cover plate of a Suzuki also?

Yes, used all the rotary valve parts from a Suzuki GP125. GP100 is much the same. But milder inlet timing and 22mm carb instead of 24.

[F5 Dave]

I was considering an RG100 Vtwin in an RS when I was playing with spare cases.

[SwePatrick]

I´m fairly new to this rotary intake disc program, so do not kill me =)
I´m about to start adjusting this thing, but i stumbled into some small issues.

Have a look =)

[jato]

Hi all, I'm needing quite a bit of mallory metal - 5/8 diameter , pos 700mm of it. any favorite suppliers in nz? Au or the US are the candidates at the mo...

[Niels Abildgaard]

Hi all, I'm needing quite a bit of mallory metal - 5/8 diameter , pos 700mm of it. any favorite suppliers in nz? Au or the US are the candidates at the mo...

Scrapped endmills are made from tungsten carbide and cobolt with a density of plus 15 gr/cc.
Diameters 16 and 20 mm are industry standard
It is easily parted with wire sparking and not so easy with diamond disc.
Scrap price around 14$ per kg.

[Condyn]

Is there any information available on machining the last bit of baffle cone on this thread? My quick search is coming up empty.
I am wondering about the purpose as I see it from time to time. Is this simply to transition into the nozzle nicely? Any examples?

[husaberg]

llllllll;;;

The venturi nozzle is there to do one thing - the stinger is a resonant length tube and strong pressure gradients leap up and down it off atma.
When a strong negative sign wave launches down the stinger it can, and does, destroy some of the positive pressure wave that ultimately stuffs the cylinder
with the A/F sitting in the Ex duct, as the piston approaches Ex closure.
Adding a tapering cone after the true pressure bleed venturi helps to prevent this bad wave affliction from affecting the "in pipe "action.
Was invented by Helmut Fath - my hero - for the Honda factory team that ran Freddy in 250/500 the same year, it had one stinger 450 long, and one 150 long.
The new nozzle invention, took away the length effect of these disparate stingers, making tuning each much easier - and closer .
Thus using a nozzle in the belly is not going to have enough effect on this low intensity zone to make much difference.
BUT, being a 2 stroke it will probably work superbly, just to piss me off.

The exhaust exit "nozzle" was used first by Helmut Fath ( my hero ) when tuning for Honda where their V twin 250 had one stinger 150 long the other 450 long.
I have tested all manner of variations and the best is around 10mm of parallel nozzle and then 10mm of divergence to a stinger around 1.5mm bigger.
This reduces the effect of the waves bouncing up and down the stinger off atmosphere disrupting the rear cone waves.

The pipe vol/engine cc field in the pipe screen was added by Neels to the program when Frits noted that he had calculated this for the RSA - maybe he can elaborate on the relationship.
Note also that there is two fields for the length to end of header and length to end of diffuser.
I got Neels to add this as so few pipe designs are "correct" and its a pain to calculate all the time.The header end should be 30 to 32% and the diffuser should be 64 to 68%

TeeZee - really glad that you are looking at the STA numbers and realising that the sim is telling you what is needed - or not in many cases.
Getting all the elements of a design in harmony is what makes big power numbers.
I would try making the divergent header nozzle longer - very short ones can create shock waves and reduce the energy available to do positive "work" in the pipe.

Another good source for big ends is Thompson - I use these in KT100 crank rebuilds as the needles are already graded.
The rear cone nozzle in the old Honda manual is well out of date.
A later version was developed by Helmut Fath and was first used on Fast Freddys 250 where one stinger was 150 long the other was 450 long.
This better design has a short 10mm "nozzle" of the correct size to create the pressure restriction, then a short taper, up to a stinger tube approx 2mm bigger in diameter.
The bigger stinger and the reverse taper basically remove this resonant tube from the equation, and the stinger length becomes irrelevant.
Under normal conditions the wave action bouncing up and down the stinger ,off the open end to atmosphere, creates varying bad effects on the reverse cone waves.
The pic shows a section of one for F3 - 400.
Rear cone welds onto LH side, stinger pushes into RH side and welded as well.
Another side effect is that there is no welding ( dags) to affect the flow where the rear cone is attached to the tube.
.

if you machine sections of the cone its far easier to get it the correct size, especially if you are dealing with the tiny glow engine

[Condyn]

Thanks Husa!

[wobbly]

The latest iteration of the nozzle is to make it about its diameter in parallel length , then a simple 45* chamfer on the exit out to the stinger ID.
I have used up to 3mm diameter difference , depending upon what tube is available.

[SwePatrick]

Everyday is a good day, only when it´s bad, it´s bad =)
Or, it was running great until it wasn´t....

Sunday, video, enjoy! =)

[husaberg]

Any kiwis got one of these lurking about I want one to make a crankcase breather for my Ducati, cough couch 4t project.
That way despite its over complicated top end with wizwams a tick tock clock pieces It will it at least have a 2t Reed Valve.


Its normally found an early Homeliite chainsaw
I thought there was one in the old mans shed but the ratio seem to be more shed than homelite Reed Valve.
there are jonseerd and old sthil
Attachment 355650Attachment 355651Attachment 355652
These are smaller then they look

I found what has this Reedcage these days the OS GT33 which by the looks of it is a 33cc RC aircraft engine.

https://ultimatehobbies.com.au/produ...-assembly-gt33

[JdG]

https://youtu.be/8Kp108x4tQA?feature=shared

Interesting video. Maybe Frits, Wobbly, Jan, or someone else that is really into this stuff will have some remarks. But all in all I think it’s a quite good explanation of different cylinder bore coatings.


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[wobbly]

Kawasaki developed the Electrosil process that is essentially identical to the high voltage plasma spray technique, mid last century.
It was a high silicone wire wrapped around a mandrel, inserted into the bore and zapped with a trillion volts.
I believe its still an aftermarket option for recoating all alloy bores to this day.

As for the impact of CO2 emissions on the environment - depends upon your ideological tin foil hat approach.
CO2 has increased from 0.03% to 0.04% in the environment over the last two decades, sufficient to wreak the planet , yea right.
And of course dont mention that the increased CO2 density has increased plant growth rates by 15% over the same period, as then you have a conspiracy theory instantly hanging over you.

Our Cindy believing that NZ banning oil and gas licenses was going to " save the whales " but then concurrently importing shit coal from Malaysia to help power EV cars, when China is now
building over 200 coal fired power plants is about as far into the sand as you can bury your head.
No more politics.