ESE's works engine tuner

[F5 Dave]

I've told you an electric pump & some jackets & aqua wouldn't be hard.

[wobbly]

My opinion would be that the 125 Aircooled would be just fine at 30 Hp with a safe ignition curve.
It didnt seem to have issues with blowups prior to the re - porting,even with the 74% Ex width.
So obviously with the extra power, and the new head setup the old ignition curve put it over the top.
Bung the new pipe on it - remap the ignition and get on with it.

[TZ350]

My opinion would be that the 125 Aircooled would be just fine at 30 Hp with a safe ignition curve. It didnt seem to have issues with blowups prior to the re - porting,even with the 74% Ex width.

The ignition curve was a self inflicted learning experience and the port was not that pretty to start with, having been salvaged from a previous mishap and it still had munt marks around the exhaust port area when it was dynoed at 31hp.

I am in the process of porting a new cylinder now that I know its worth while using a good one.

And yes, I think a 30+hp air cooled can be made reliable, I am betting on it.

[wobbly]

Ve haf ze technology.

"Ernst Degner"

[F5 Dave]

Good, I plan on stealing it. I mean, would you like your basement cleaned?

[husaberg]

Good, I plan on stealing it. I mean, would you like your basement cleaned?

Stealing seems little harsh. For most of the accounts suggest a lot of the MZ technology had been "Nationalised" as it was in the first place.
Degner just disseminated it. For us all to share. Well eventually anyway.

Who knows for sure, what actually went down, I wasn't there anyway. Maybe those Suzuki's and Yamaha's getting so fast so quickly... was just a coincidence.
But ones things for sure. The Japanese had far greater metallurgical technology and immense financial resources.

[TZ350]

Ok not a new single port but the old triple port re-jigged (as best I can) in EngMod2T to work with Wobblys pipe.

Now you didn't know you could get so much port and blow down area into an original 78 Suzuki GP125 cylinder.

Maybe next week we will get it onto the dyno, then see if this sucker eats pistons too and whats needed to cure it of the habit.

[dinamik2t]

Hey TZ, cylinder looks tidy!
Tell us about port durations in this cylinder in comparisson with the single-Ex one - unless there are any japanese cameras around

By the way -ie: me liking the port radiuses in your cylinder- I found this tooling : http://www.ebay.co.uk/itm/2609985688...ht_1681wt_1270

A radius gauge. There are also available in the 1-6, 15-20something and 26-80 mm range. It's a little 'gadgetty' - I got a pair for port radius measurement.

[Frits Overmars]

Find the radius gauges...

[dinamik2t]

Many thanks to Frits from my part also!

Except all other impressive stuff in the files, there is some that tingled my curiosity.
It's in the last two photos of the 5th folder, named "workbench". What are those circular stuff on the wooden rectangle, between the pipes and the cylinders?? Remind me of those mirrors the dentists use.
(8th December 2011, 11:39)

Better late than ever -ha! How was your trip to Germany, Frits?

[Yow Ling]

Frits, Could this be an answer to the sliding seal on your friends 50

http://www.circlecycleice.com/page9.php

go to the images page and look at the compression rings. The engine is a bit erotic and out there but may have something there for us

[TZ350]

Hey TZ, cylinder looks tidy!
Tell us about port durations in this cylinder in comparisson with the single-Ex one -

The single Ex port opened 78.5 deg ATDC @ 75% the tripple was going to be 85 but now its 82 @ 73%. The transfers are the same at 116-117-117, Inlet 145/85.

[Yow Ling]

http://www.epi-eng.com/piston_engine..._cup_to_f1.htm

http://www.epi-eng.com/piston_engine...y_contents.htm

[breezy]

can anyone shed any light on whats going on here. i run the piston back to front to avoid the piston ring ends falling in the in the inlet port.with what ive seen previously in other forums is that its running to lean and over heating, although the plug showed it to be running rich. it did tighten up momentarily and cut out but did run again after about 15mins in the pits. having just pulled it apart i can see that i have some issues.any feed back would be very helpfull.. thanks

[TZ350]

Lots of interesting stuff there. Like running the piston back to front. I guess the ring ends travel on the portion of barrel between the transfers and exhaust port. How wide is the exhaust port? and it looks like its running an iron cylinder, BSA Bantam? also interesting combustion chamber shape too.

The motor does look like it has got hot.

Assuming you have the mixture and ignition timing correct and no air leaks then my money is on the inside diameter of the stinger (or stinger venturi) being to small, makes good power on the dyno but eventually over heats the motor and the piston crown in particular. How does the stinger size compare to other similarly setup engines.

Hopefully, some of the (more knowledgable than me) developers on here will post their ideas too.