ESE's works engine tuner

[F5 Dave]

Its the side holes close to the piston bosses I'd be most concerned about

[TZ350]

Its the side holes close to the piston bosses I'd be most concerned about

Me too, its truly a fingers crossed situation, hopefull any problems will show up on the dyno before we get out onto the track.

[gravmax88]

grabbed what i thought was a Piatti AMC engine cylinder.It turns out it was not what i thought it was.

It has a very British Hepolite piston +60 thou it has massive transfer cut always so very un-villiers.

It also has unusual transfer bulges outside of cylinder so again un-Villiers but no transfer slots and a flat top piston.
It may be the mark 2 version mentioned in the Villiers article i posted? Also judging by the bore it must be a 250.
it is unbelievably heavy compared to the 8e/9e.

Most unusually it has a heart shaped inlet port. poor quality pics sorry as now, i can't find my camera.
Can anyone make a call on what it is?

I guess you may have to be over 60 to answer the question sorry

Looks like a "Vale Onslowe" Cvlinder that was made for the villers bottom ends in the mid 60's. they were a London bike shop that were into karting back then. A few turned up in CHCH in the 60's and were a good thing at the time....

Graham Selwood

[husaberg]

Looks like a "Vale Onslowe" Cvlinder that was made for the villers bottom ends in the mid 60's. they were a London bike shop that were into karting back then. A few turned up in CHCH in the 60's and were a good thing at the time....

Graham Selwood

Thanks Graham i had heard of the name in the Villiers book i will have a google.........



In the Greeves pic the fining sure looks the same

[Frits Overmars]

Me too, its truly a fingers crossed situation, hopefull any problems will show up on the dyno before we get out onto the track.

Better make sure you are not dependent on hope, luck, faith etc, TeeZee. And you could shorten your throttle cable. Those twists will spoil the rider's feel.
I think the slot in the piston in combination with the middle injector is a good idea. I'm not so sure about the other mods...

[Dutch Fisher]

Using a PC based oscilloscope with an ignition analysis app,I saw the burn duration at x4 using twinfire and a Crane coil, over a standard single cdi and RS125 coil.

Can you post the before and after waveform?

[cotswold]

Looking at that piston you should let Kel have first ride .

I will sit that out too

[wobbly]

I dont know if the oscilloscope has a screen "stop" and capture facility.
When I run the TZ400 system on the bench I will see if it can be done - or maybe I could use Gadwin to capture one cycle, not sure!

[FastFred]

Better make sure you are not dependent on hope, luck, faith etc, TeeZee....

We have the one true wooden God, what can go wrong?

[TZ350]

Better make sure you are not dependent on hope, I think the slot in the piston in combination with the middle injector is a good idea. I'm not so sure about the other mods...

I am not sure about the mechanical integrity of the other mods either, but without expensive and time consuming modeling techniques there is not much more to be done than best guess and hope .

In the scheme of things this little step into the dark is really not that big a deal, if it all goes tits up, the sun will still rise tomorrow, so we can live a little on the edge and see what happens

Whatever the outcome we will be able to build on knowledge gained.

[TZ350]

With squishy things like base gaskets and a composite head gasket its a bit of a trick to get the cylinder stack height right for the required amount of squish.

Also piston rock makes it a challenge to measure the squish properly. I use looped pieces of soft solder at the sides of the piston but maybe all four quadrants would be better. Anyway like all measurements its up to you to work out better ways of making them.

[Moooools]

but without expensive modeling techniques there is not much more to be done than best guess and hope

Do what everybody else in the world does and find yourself some illegitimate software.
Solidworks or Creo and Ansys FEA.

May I suggest a torrent from thepiratebay.

As long as you aren't selling the products you are pretty damn unlikely to be chased down by a hoard of lawyers.

[TZ350]

Do what everybody else in the world does and find yourself some illegitimate software. Solidworks or Creo and Ansys FEA.

I hadn't thought of a pirated copy of Solid Works.



I can see it shows the stress areas but certain failure or not? quite probably if you know how to use it, I guess, certainly good for optimizing things anyway.

In a couple of days the dyno will pass judgement for sure, and give the modification a clear pass or fail. But I can see now that if I had been at all familiar with using this sort of software I could have had a much better idea of the likely outcome, next time.

https://d2t1xqejof9utc.cloudfront.ne...pdf?1333781293

Here is a Masters Thesis on dynamic load analysis, interesting.

[Moooools]

I hadn't thought of a pirated copy of Solid Works.



I can see it shows the stress areas but certain failure or not? quite probably if you know how to use it, I guess, certainly good for optimizing things anyway.

In a couple of days the dyno will pass judgement for sure, and give the modification a clear pass or fail. But I can see now that if I had been at all familiar with using this sort of software I could have had a much better idea of the likely outcome, next time.

https://d2t1xqejof9utc.cloudfront.ne...pdf?1333781293

Here is a Masters Thesis on dynamic load analysis, interesting.

I forgot solidworks has a built in FEA engine.

It will be able to tell you stress at each point (and also stiffness but probably less important for this application) and then use matweb or similar to try and predict how many cycles it will last. I would suggest doing a little reading of fatigue of non ferrous metals. Finite fatigue life and all that jazz.

No need to do dynamic analysis. A static structural analysis will tell you most of what you need to know. Just calculate forces on the piston from F=ma, Pressure on the crown from the combustion chamber and friction in the bore and apply them to the piston with the piston pin fixed in space. Getting the contraints accurate is most of the battle.

[speedpro]

I used to crack Suzuki pistons at every bucket meeting right through where those side holes are. I replaced them every 2nd meeting. It may be better without the piston port in the back wall.