ESE's works engine tuner

[TZ350]

Last year a friend of Team ESE had been trying his hand at land speed record breaking in Aus. For this year over the Xmas break we are helping Jim out with a bit of dyno time and hopefully Jim and his daughter Kath will get in some more good runs at lake Gardner. I am not entirely sure of the rules for his class but they look like they may be very similar to our Bucket rules and he is using an ex David Diprose bike.

This is Jim's wright-up from last year.

Hi All
Thought I'd pop you a note on the trip to the DLRA Speedweek at Lake Gardner, SA.

I was going to go with a mate from Scott Machinery who is a bit of a petrolhead and also knows how to speak Australian, however he got quite unwell and couldn't come. So daughter No2 -Katherine said "I'll come Daddio". So that was that!
Sent bikes to Adelaide in Box/Trailer I made.
Met up with Don Short-an expat Kiwi and we jointly rented a camper through Shareacamper and also split accommodation and travel costs.
Traveled up to Augusta and stayed overnight.Katherine had expressed an interest in riding the 50 in one of the two classes it was entered in so as she had NEVER ridden a bike before it occurred to me she may benefit from a wee riding lesson before we got to the salt. So we stopped at a little outback town called Kimba, unloaded the 50 and within about half an hour she was cruising through the gears and settling into it amazingly well. Got to the lake later that day and checked out the salt.
Tech inspection next morning and both bikes went through with nil issues.
Did my rookie run and the 50 started missing -pulled carb apart and cleaned out-fixed.
Kath did her rookie run after lunch and recorded 68mph. Crikey!! This turned out to be the best we could get from the 50-wasn't entirely surprised as it was built as a 1 hr endurance bike and my best at home was 72 mph on Hakarimata Rd (in front of our house)
I did my run on the 50 with fairings on and then turned my attention to the 100. First run was 71mph with a slipping clutch. Pulled the engine out 3 times and substituted front and back plates, added spacers etc etc and by the last run had raised the speed to 86.915 mph at 11500 revs-still with a clutch slip problem. Bike was accelerating strongly up to 11500 revs but was slipping freely after that but engine will pull strongly through to14500.
Ran out of time on the last day to have one more run by which time I had locked up the clutch. Four records set but we did not achieve our target speeds which was the primary goal of course
Target speeds were-80mph+ for the 50 and 100mph+ for the 100.
So -unfinished business of course.
Plan going forward-Improves to the 50:
Upcarb from 18 to 26mm with external mixture adjustment.
Better Ignition
Better Chamber
EGT, O2 and ambient airtemp sensors,
all linked into a CPU that has WiFi to my phone and makes tuning quite friendly.-(theoretically anyway)

Keep Katherine on it as number 1 rider!!
She told me the other day she had to throttle off a bit on her rookie run because of the cross wind!

100
Better clutch plates and stronger springs.

Had a wonderful/busy time-met a raft of interesting neat people who treated us almost like family.
And the Lake: A stark,serene and somewhat surreal geological wonder that I can't really do justice to with adjectives alone. The sunsets are really something else!!
Kath is going to do a write up of her own of the little trip complete with pics etc of course.

Jim & Katherine Goulter

[wolfie]

Hi ive been a lurker here for a while, picking up some hints on 2 stroke performance as I race at Lake Gairdner as well. RGV250 with a best speed of 140 mph.

Here is a link to the 2019 rule book that is free to download from the DLRA site. https://www.dlra.org.au/rulebook.htm

Looks like they are running in and got some great speeds.

50-MPS-CG
50-M-CG
100-APS-CG
100-M-CG

Ill keep an eye out for Jim & Kath next year. Always good to get some more smoke on the lake.

Dave

[speedpro]

100 Better clutch plates and stronger springs.

Not required.

With a bit of machining an extra pair of plates can be fitted and with the standard springs the clutch is good for about 25hp. Feel at the lever is identical to a standard clutch. The addition of small spacers on the springs will see it good for about 30hp @ 14,000, not sure what torque which is the critical bit. The fibre plates are all the same in that vintage of Honda.

[husaberg]

Not required.

With a bit of machining an extra pair of plates can be fitted and with the standard springs the clutch is good for about 25hp. Feel at the lever is identical to a standard clutch. The addition of small spacers on the springs will see it good for about 30hp @ 14,000, not sure what torque which is the critical bit. The fibre plates are all the same in that vintage of Honda.

Gen CR80 from about 87 are meant to be better material though, Kevlar i think rather than pulp
you can also adapt the XR200 style realese bearing and alloy spring retainer with a larger push rod
The XR200/185/125s hub can be added its deeper buts an additional few plates but it requires the center pressed out some machining and the cover spaced out and other mods that i have likely forgotten about.
As a side note if the rules allowed i would use a late CR80/85 hub and primary as they have far narrower gears and a lighter hub
i havent tried the spline on ther crank yet but the ratio and the hub is the same

[oldjohnno]

For applications like LSR - where instant response isn't important - additional flywheel mass helps the clutch (and the whole transmission for that matter) to survive. The extra rotating mass lops the top off the torque spikes produce by a single cylinder engine. Does wonders for traction too with things like trials bikes.

[Frits Overmars]

100: Better clutch plates and stronger springs.

Not required.
With a bit of machining an extra pair of plates can be fitted and with the standard springs the clutch is good for about 25hp.... The addition of small spacers on the springs will see it good for about 30hp

Maybe not good enough; once that 100 starts producing decent power, it ought to exceed 30 hp. And maybe not required either.
There is a new transmission oil, developed for wet-clutch racing engines, that exceeded all expectations (3 German roadracing championship titles in 2018).
I doubt whether you'll already find it in NZ or OZ, but you can get it from Langtuning who helped develop it:
https://langtuning.de/Shop2/ADDINOL-...ng-Getriebeoel ; kontakt@langtuning.de
or from Emot: http://www.emot.nl ; stehouwer@emot.nl .

[Frits Overmars]

All the best to all of you, folks!

[yatasaki]

Hi to all
Decided to surprise myself for Christmas by registering to this too-far-away forum as I have some serious questions.
My name is Frano, mechanical engineer, two stroke moped and classic/old timer racer, doing more than great so far as rider and builder. Coming from one of Croatian islands. Presently building two engines for 4 hours moped endurance race.

[Frits Overmars]

Dobrodošli Frano. Any chance of pictures?

[TZ350]

Dobrodošli Frano. Any chance of pictures?

I would love to see some pictures too. But there maybe a minimum number of posts required before attaching pictures is automatically allowed???

[yatasaki]

Obviously
...

[yatasaki]

It worked...
So which pictures? Thematic or beauties (natural) from my island?

Let's stick to two stroke
Above is 2016 and 2017 winning moped cup cylinder, my first question is about the ports added between main exhaust and A ports ( forget about exh boost ports, they were added later on and added short circuiting) I used to call them golmans, like to prevent or slow down a bit mixture from rest of the transfer ports from going to exhaust. Timing of these subA ports was half of the A ports which are 126° angled 10°, B 130 ° angled 70° and C 132° angled 70°upward. So B and C are heading torwards cylinder head...exhaust 168°.
Any similar idea or comment?

[katinas]

Latest tests with KTM SX 125 engine was much harder than on SX 50/65/85. It was very difficult to rise power and at the same time not lost the mid range.

With rounded piston, engine respond not as good as on the smaller engines, maybe because this time we cant try bigger stinger and SX 125 piston is flat top, but difficult to say.

Interesting, this time with rounded piston ( just 0,5 mm , with 1mm no gains, maybe HGS pipe stinger is too small), engine works better with raised ( + 1mm), not lowered, cylinder. And only raised piston side cuts itself gave some power (add photo).

Photo with heads- upper cracked VHM at 2 clock, two others what we made for tests.

Power valve opens around 7000 rpm.,
Blue - what we gave from owner.
Red - where we ended ( no more time to test, owner want to take it back, but still not tested on the track because of snow.)



Good Christmas time to all and many thanks for this Thread.

[husaberg]

Celebrating your coming-out, Husa? Coz those don't look like season's wishes to me
By the way: all the best to all of you, folks!

Personally i am more a lesbian woman trapped in a mans body.
Merry Xmas


Some on Bike 500 footage

[peewee]

not a lot of updates to report but im still chipping away at it every chance I can. exh passages are welded on and now its just a bunch of grinding away the existing outer shell and extend the aux ears to the end of passage. maybe the exh spigot would of been fine with three bolts attaching it to the cyl but I decided to use four