ESE's works engine tuner

[wobbly]

Im sure you are right Frits, I saw the water spraying all over them in a video.
Then they tell me they only have 420* in the header.
They run absolutely mental compression ratios, then drown the engine with fuel, and use extra big stingers to stop it blowing up.
Even on jungle juice they make way less power than you guys were on unleaded, the pipe design is a joke.
Much to do.

[teriks]

Ohhh, _that_ Rossi hydro plane, talk about jumping to conclusions..
-There are model hydro planes as well, and Rossi miniature engines.

[TZ350]

Just a couple of things to note - the program will crash with an entry greater than 100 for duration - its not a "real" entry.
And your ignition timings are very wierd - never ever seen any 2T that will run 40* at any rpm.

Thanks for the 100 tip ...... being a newbee I was just taking the duration data from the performance display screen as is.

With a sensible ignition timing and 100 duration the burn went past the ex opening point, the 40* timing was to get past that issue.



Now I think I understand the real problem, with 99 duration the program handles the data string ok and saves it but with a 100 or greater the program crashes.

To me it looks like, its not that the number is a 100 or greater or even plain wrong, its that the number is three digits long and that pushes out the length of the data string and the end de limiter is lost.

Some data input checking for string length and format on these fields as they are enterd would cure this and give the data entry operator a chance to correct any mistakes without losing all of their input work on this screen.

I did not know what I was doing wrong before but now that little issue is sorted, I am off again looking for a new way forward for my engine and modelling stuff to see how it might work out, sure I expect there will be other little issues, but who cares.

Up and running again ..... .....total happiness

[husaberg]

I found these in the Haynes published the Two stroke engine design and Tuning KG Draper

That Kobas and I were discussing earlier there is some interesting design features here old hat yes outdated yes but interesting nevertheless.
Well to me anyway.

[dmcca]

Up and running again ..... .....total happiness

EngMod2T is a roller coaster ride thats for sure! One minute you think you know it and the next you realise you dont.

[Frits Overmars]

EngMod2T is a roller coaster ride thats for sure! One minute you think you know it and the next you realise you dont.

Is that so? Then it's a perfect imitation of a competition two-stroke .

[Strokerhaus]

I found these in the Haynes published the Two stroke engine design and Tuning KG Draper

That Kobas and I were discussing earlier there is some interesting design features here old hat yes outdated yes but interesting nevertheless.
Well to me anyway.

Interesting yes, I have a peripheral valve Alpha, but the big issue is inlet area at flywheel is some what restricted. Now rebuilding a Centuri which was a good machine in its day but will be a challenge to match the modern Ariel Arrows in UK CRMC but you have to try. The biggest issue with that is twin disc valves with one carb, 180 deg crank and limited room between disc valves.

Keep up the great work, love the forum.

[TZ350]

modern Ariel Arrows in UK CRMC

I would love to know more tech details about the Ariel Arrows ......

[husaberg]

Interesting yes, I have a peripheral valve Alpha, but the big issue is inlet area at flywheel is some what restricted. Now rebuilding a Centuri which was a good machine in its day but will be a challenge to match the modern Ariel Arrows in UK CRMC but you have to try. The biggest issue with that is twin disc valves with one carb, 180 deg crank and limited room between disc valves.

Keep up the great work, love the forum.

You have both. Wow.
I found finding info on the twin a little daunting. There are few pics i had seen that show the disk set up in detail, and one of the museum ones was burnt destroyed can't remember if it was a twin or single. Is one of these yours perchance?http://www.lortim.demon.co.uk/alpha/index.htm

I do have this which was similar era and more conventional in design.post later

[husaberg]

You have both. Wow.
I found finding info on the twin a little daunting. There are few pics i had seen that show the disk set up in detail, and one of the museum ones was burnt destroyed can't remember if it was a twin or single. Is one of these yours perchance?http://www.lortim.demon.co.uk/alpha/index.htm

I do have this which was similar era and more conventional in design.post later

One more page sorry will fill in gaps with Ariel or Alpha for the nostalgic types.

Yes Rob I did find some Ariel stuff in the book library. But the stuff from England would be much more interesting remember the Arrow was slightly based on the Addler as was the original Yamaha.

[husaberg]

One more page sorry will fill in gaps with Ariel or Alpha for the nostalgic types.

Yes Rob I did find some Ariel stuff in the book library. But the stuff from England would be much more interesting remember the Arrow was slightly based on the Addler as was the original Yamaha twin

A beautiful GP5


Sorry no more old dungers for a week after this. Rob made me do it.

Although I must admit the thought of a old Ariel 2 stroke stuffed full of TZ internals sucking on Methanol with 2011 porting technology socking it to $50,000 dollar Manx Nortons does give me a little wood.Does that make me a bad person or just demented?

[Strokerhaus]

Yes a couple of my single cylinder Alpha bottom end's are on that web site, and the picture you attached of the Alpha test bike with the very early single cylinder engine is one of my bikes although it no longer looks like that. The Alpha twin on the web site is one of 4 machines that "survive", but its not mine. That is the sister bike of the one damaged in the fire, which is being rebuilt slowly by its owner, the frame is now straight thanks to young Sprayson, there is now a replacement gearbox sourced from New Zealand, he has a spare engine, so heading in the right direction. I'm now making a replica Centuri engine since I do not want to trash another original Alpha engine on the race track, heads and crankcases already cast I still have to finish the core boxes for the cylinders, but that could take a week or two yet! My bike is one of the two DMW versions used in the 68 TT, neither of which managed a lap during the race. Another little snippet is the bikes run on a 29 mm Delorto with an 1800 main jet, yes not a miss print, one of the short falls of using a single carb and twin disc valves, however having said that, the final version did manage to produce 48 bhp at the crank, and had an amazing appitite for primary chains.

The Merlin engine in your photo's was very popular with the Kart people, there were 3 versions to my knowledge a 200cc, 250cc and a 350ish cc engine. A very good little engine, but sadly not developed like so many other good ideas.

The Arrow engine is now becoming popular again in Classic Bike racing in the UK, as you said the engine is very similar to both the Adler and TZ, with the same bore and stroke. The bikes currently racing in the UK are much more like the TZ internally, than an Ariel. The Ariel came in multiple shapes and sizes, 200cc, and 250cc with the latter available with the standard single carb, or the twin carb sports version. All bikes had the basic very stiff pressed steel spine from, which was very advanced for its time and trailing link front forks which are very heavy, the Leader had the extra body work for every day transport, and the Arrow was the bare sporty bike. Good machines.

Another interesting British engine was the Royal Enfield GP5 designed by Hermann Meier, which I think was one of the first 4 transfer port engines around, and way ahead of the Yamaha versions, and not counting the MZ boost ports. Hermann was a very clever engineer who also tuned the very succesful TT Arrow ridden by Mike O'Rourke.

Enough now lets get back to modern stuff, so I can revise my designs for the Centuri core boxes!

[Frits Overmars]

Just one more picture of an Ariel Arrow before returning to the 21st century. Note the clever crankcase 'cooling' fins right behind & above the headers...

[bucketracer]

Local bike, Taupo track, Wobbly pipes, bikes from Tauranga I think, I have seen it at Puki during the Classic Festival.

[wobbly]

Yes, the Arrow in that pic lives just down the road from me.
Its got Yamaha crank parts, CR125 pistons, PVL Ignition, twin carbs on Methanol, my pipes, a 6 speed box in the original gearcase ( Shhhh ) and about a months worth of
porting and machining.
Got to make a living somehow - stealing money off classic nutters is one way.