ESE's works engine tuner

[husaberg]

hahahaa thats classic!!!

umm i been building this engine which i copied off the peter steadman ke125/rg barrel motor with a few teeeennny tinnny changes.

I ran it yesterday in a few races and it went better than i expected, attached it a photo of the piston... to me it looks perfect but what do you guys think?

added a couple of the cool machining photos too.

many thanks

11th February 2011, 21:41
I got a 29hp engine on triple-r-superbike dyno, the clutch was slipping bad and it was sucking in gearbox oil so i am sure there is a bit more power, i was running a 33mm vmx carb but am going to try a 28mm pwk carb, i have fixed the clutch with a new kit and added stronger springs, also fixed the oil issue with new seals and more GOO around the rotary disk cover. Its running a cr125 ignition which i want to replace with a zeetronic so i can make use of the powervalve and sort a good tune out.

On its first outing it shagged the original clutch kit and then started drinking the gearbox oil but it was still reaching just over 170kph at ruapuna, there were more power available but i ran out of smaller back sprockets.

I had some good help from F5Dave and Peter Steadman.

its in a rs125 chassis

Oh the pipe is a modified tz250 swarzzzz... swerz......... na swarzbrook?? shit cant remember pipe. seems to work pretty awesome, strong power everywhere.

I would actually like to send all my spec/info to wobbly and see if he has any ideas on what else i could do to make it better.

Some pics below.

Is this an annually updated project Bren?

Nice work.
So it is 29hp? Or more?
What chassis is it in now?

[Bren_chch]

i pulled it apart not long after that, then it sat for ages.. i got a new piston in it and put back together but i stuffed up the piston/bore clearance, so it sat again. another type of piston in again and some other changed after keeping an eye on this thread over the months.

its in a rg250 frame, feels much much better for me!!

just heading out, will post up some pics in the new frame when i get back

[F5 Dave]

What gas are you running Bren?

[Bren_chch]

What gas are you running Bren?

that was 98.... i know i know u said race gas only!!!

[F5 Dave]

unleaded burns a bit darker I think, never really used it, I'd have been expecting a bit lighter for av if the jetting was close, so don't take any chances. Looks like it goes well & looks like a symmetrical pattern.

[Bren_chch]

unleaded burns a bit darker I think, never really used it, I'd have been expecting a bit lighter for av if the jetting was close, so don't take any chances. Looks like it goes well & looks like a symmetrical pattern.

cheers... kinda my thoughts too. next outing will be avgas, also better gearing, will try make a race video.

oh going to fit peters carb and do a back to back, i think the pwk is too small.. 28mm

[trevor amos]

Is there any one out there with an English laguage version of the Frits pipe article , or , alternatively can recomend a good on-line translation site.
Frits no doubt finds it " old hat " but us beginers need all the help we can get . Finally , it`s good to see Neels popping in for a look now and then !

Regards to you all , Trevor

[Frits Overmars]

Maybe you could entice Neels into translating it. After all, our native languages have the same source (Afrikaans stems from Dutch) so no doubt Neels can read Dutch as well as I can read Afrikaans. And no doubt Neels has more English than I do.
Just kidding, I cannot spare the time and I am sure neither can Neels. But just in case someone produces an English translation, I would love to get a copy.

[trevor amos]

There you go guys , who could turn down a request from Frits ! I`m sure one of you clever people out there can get on the case and do a lot of people
a really good turn , i`m sure i`m not the only one .
Any spare time Neels ?

Regards Trevor

[rgvbaz]

Hi ,my names Dave, been lurking here for a while. really enjoying the thread.

I race a 50cc aprilia RS50 2 stroke in the FAB-Racing championship in the UK, I guess our championship is the UK equivelent to bucket racing.

Anyway, I've asked my dad to have go at translating Frits's article. It's been 44 years since he moved back from the Netherlands where he lived for 8 years. Not sure how he will get on with the technical bits as he grew plants out there, he did say he used to think in Dutch in his mind, when he first came back home he had to translate the English word to Dutch for a while so his Dutch was good but 44 years is a long time.

Anyway, I will email it to him and he will see what he can do.

Cheers

Dave

[ief]

Hi all, another lurcker here and me as well want's to say tnx to all who've contributed so far, quick to Frits as far as he recals my name anyway

Reason i'm posting is, although i coud try and translate the Frits expansion chamber pdf I thought i'd post this link here first as to me it seems to cover most of the basics and is a good read as well. (and slightly more modern, if there are things not correct i'm sure someone on here will straighten it out )

expansion chamber theory link

[F5 Dave]

Hi ,my names Dave, been lurking here for a while. really enjoying the thread.

I race a 50cc aprilia RS50 2 stroke in the FAB-Racing championship in the UK, I guess our championship is the UK equivelent to bucket racing.

Anyway, I've asked my dad to have go at translating Frits's article. It's been 44 years since he moved back from the Netherlands where he lived for 8 years. Not sure how he will get on with the technical bits as he grew plants out there, he did say he used to think in Dutch in his mind, when he first came back home he had to translate the English word to Dutch for a while so his Dutch was good but 44 years is a long time.

Anyway, I will email it to him and he will see what he can do.

Cheers

Dave

Hi Dave, welcome aboard [& ief]. We have 2 classes here. F4 & F5. F5 is 50cc proper engines & 100 4 strokes with carb size limit. F4 is 100cc or 125 aircooled with carb limit. oh yeah & 150cc 4 strokes. F4 is the larger of the classes due to bike availability & some sort of compensation I'm sure.

In NZ we are so isolated by water we have really only english as a primary lanuage & ironically even though there are heaps of Dutchies here most seem to have come so long ago thier kids grew up with English. However we do have an increasingly large S.af population, maybe we will get some response.

[rgvbaz]

Just had a text from my Dad,

He said the article starts as being about a 15 year old boy getting his first moped and wanting to see how it works, from there it led too seeing how the engine works and from there to the exhaust system.

It will be interesting to see how the two translations compare.

Dave

[Frits Overmars]

Hi all, another lurcker here and me as well want's to say tnx to all who've contributed so far, quick to Frits as far as he recals my name anyway
Reason i'm posting is, although i coud try and translate the Frits expansion chamber pdf I thought i'd post this link here first as to me it seems to cover most of the basics and is a good read as well. (and slightly more modern, if there are things not correct i'm sure someone on here will straighten it out)
expansion chamber theory link

http://homepage.mac.com/rg500delta/d...pe_design.html
This is very good reading!

[rgvbaz]

Hi Dave, welcome aboard [& ief]. We have 2 classes here. F4 & F5. F5 is 50cc proper engines & 100 4 strokes with carb size limit. F4 is 100cc or 125 aircooled with carb limit. oh yeah & 150cc 4 strokes. F4 is the larger of the classes due to bike availability & some sort of compensation I'm sure.

In NZ we are so isolated by water we have really only english as a primary lanuage & ironically even though there are heaps of Dutchies here most seem to have come so long ago thier kids grew up with English. However we do have an increasingly large S.af population, maybe we will get some response.

Thanks Dave.

Our classes are just about to change for this year. There were four clases in the MotoTeam class last year http://www.fab-racing.co.uk/page3aa.html we raced in the class four which is 50cc in a road based chassis or 128 2 valve aircooled in a road base chassis. The 50's were pretty quick compared to the 4T's eccept for one, a guy called Kev on his RS50 chassised 4T who won.

This year our class will be 50cc liquid cooled only, however the RS125 chassis 50cc's will be in with the production chassis 50cc's, apparently there is a fair advantage to be had with the better chassis.

Here is some you tube of some of our races http://www.youtube.com/watch?v=CaT6R...eature=related

Dave