ESE's works engine tuner

[Yow Ling]

Post Classic possibility for the Tiddler class.

Attachment 306371

One cylinder of a RG125T bore stroke 43x43, 44 crank hp as a twin.

What is an rg125t ?

[ief]

Perhaps it is as simple as, the one that gives most power Rob, sance detonation Let's see what Wob says. I just used a 4 point curve like I know from rd's and the like, felt more comfortable, eager to see if your efforts where the right way.

edit: cooling might be easier with 'mine' in the longer run?

ps, you think the rs125 scavenging is apropriate for the/ your RG?

[TZ350]

What is an rg125t ?

Home brew Suzuki GT125 twin fitted with RG50 cylinders that have been bored for 62cc each.

ps, you think the rs125 scavenging is apropriate for the/ your RG?

No not sure, but the RG50 has reasonably curved transfer ducts. I usually use Yam12 for the GP but non to sure if that is the right thing to do either.

[ief]

That I'd never tried this before... rs125 vs yam12, hardly a difference (on this setup) Was expecting something major

[wobbly]

TubMax is a reflection of the % of fuel energy retained in the unburned end gases trapped in the squishband.
The shape of this curve is affected by a myriad of elements but the biggest factor is the real ignition timing.
In a race engine the results are supremely useful for juggling the ignition timing to fix any major anomalies that can produce low bmep
at one point or several in the usable powerband.
Where you are running what i would call "normal" numbers for timing - say 28* at the bottom of the range and 15* at peak then some further retard
to get heat in the pipe for overev capability,the curve shape will be close to that of the torque produced, a flattened bell.
ie low 900 rising to high 900*C at peak torque then dropping away again as more of the combustion heat energy is dumped into the pipe.
You have to be careful of part throttle deto at the beginning of the powerband, and then of course if the temp starts hovering at 1000* in the high power range
you will get DETO lighting up on the screen.
To drop the temp it is easy enough to simply retard the timing - but more power may often be had by adjusting the stinger, or reducing the com/squish velocity then rerunning the
Turbulent model to account for the differing flame propagation speed thru the chamber due to squish turbulence changing the combustion delay numbers etc.
These factors are just as important, sometimes more - than the "raw" ignition timing number at any rpm point.
Each end of the bell curve can be tipped, by use of a powervalve for example,or a solenoid powerjet that is simulated by a change in A/F ratio past peak power.

[F5 Dave]

Suzuki GT125 twin fitted with RG50 cylinders that have been bored for 62cc each. . .

Making a 125 wc 2 stroke. What class will you run that?

[TZ350]

Thanks Wob ...

[TZ350]

Making a 125 wc 2 stroke. What class will you run that?

A friend is looking at Post Classic Tiddlers, but it has got me thinking about a 100cc version, maybe if the RG50 project goes well we will make a 100cc twin with CVT for F4.

[F5 Dave]

A friend is looking at Post Classic Tiddlers, but it has got me thinking about a 100cc version, maybe with CVT for F4.

Will only be legal if you can prove it was done at the time. Which considering the RG was released in about 1984 might require Marty McFly to be involved (think DeLorean)

Ahh screw the infringements, Win8 makes this too hard.





I googled Suzuki RG50 for images & a few rows down saw myself on my No. 27 RG when it was silver.

[TZ350]

F5Dave ......

[F5 Dave]

The oddities of Google. I ran it again & it didn't show. Then I refreshed & refreshed & it did. Lage size, note Flag guy in the 'Bum pants' we awarded if you fell off. Had to wear them till someone else fell off. This isn't posed photo, I look bored. Those leathers look 10 years newer than now.

[jasonu]

Home brew Suzuki GT125 twin fitted with RG50 cylinders that have been bored for 62cc each.
.

Please post pictures.

[TZ350]

Will only be legal if you can prove it was done at the time.

Yes you are right, not pre 82 at all, ohoo well it could make a neat F4 100 I suppose.

Please post pictures.

No pictures, its just ideas at the moment, and anyway the cylinder spacing of the GT125 is a bit tight for two RG50 cylinders. We would have to shave the inside sides of the RG50 cylinders to get them to fit, could be done but does not look easy.

[F5 Dave]

Its been done with 2 watercooled MB50 cylinders by Phil Bird. Actually GPR own it for last 20 yrs

I've looked at RG cases & wondered about a Vtwin conversion that might just fit in the RS chassis. Would be light for a twin which the GT isn't + GT is 5 speed.

[husaberg]

A friend is looking at Post Classic Tiddlers, but it has got me thinking about a 100cc version, maybe if the RG50 project goes well we will make a 100cc twin with CVT for F4.

but you wouldn't use a old 1980's rg50 cylinder would you...........its 2014. I wrote 2013 first time lol