ESE's works engine tuner

[sidecar bob]

Well I built the bike for Trevor Discombe to replace his TZ350 I did , that won the Challenge for the last 2 years.
But at 70 his wife thinks he loves the bike more than her, so has left - permanently.
So i own it, lets just say a 14 dead in Pre 82 Junior isnt possible without around 5K of Ohlins on board.
And between every race while Dennis was sleeping I changed the gearing, did the data downloads, and changed the jets.
This is what it ended up with - 12,000 = 248Km/Hr, is the bike fast, sure is, is Dennis fast,sure is.

So it's not really a pre '82 at all then? Seeing as the chassis was built several years ago at best. Where does that leave you? Did they have data downloads in1982? I was doing a lot of drugs then, so can't be sure, but I honestly don't recall it.
I wasn't curious how much the suspension cost, that's a given, more interested in what it costs to make a 'stroker perform like that. Anything like what Bill Buckley was charged?
Between races I chilled with my homies, as my bike was sorted straight out of the van.
I suppose I don't really give a fuck who people think built my bike, because I'm not trying to impress people in order to create a business of it, although clearly I've built a faster pre '82 senior than all but possibly one competitor, so maybe I should.

[MotleyCrue]

Guys, do you think the rest of us ("us" being the majority that far outnumbers you) give a rat's ass about any of this ? We don't. Save it for a PM and stop cluttering up the thread.

[TZ350]

Big day today bike is running up real nice . Would like to thank all gpr boys for this build really nice work

I very much admire the work that has gone into this bike and engine.

Check with TZ, so long as the results are posted on KB he always seems happy to run the dyno (DynoJet) for a 2T Bucket.

We will bring it would be good to see what it's at riding it i think it will be round 25 at this stage just don't want it to blow to bits

If you are bringing it up for the 2 hour I would be very happy to help you run it up on the dyno.

Below are post links to some of the development work done making the cylinder for this very clever bike.

You will have to click on the link to view the whole post and pictures, they are worth a look.

... hope to have it running in the next week or so.
Attachment 315108Attachment 315109Attachment 315110

Barrel and sleeve together, Head needs a spark plug tap put down it and then adjusted for height.

Mostly milled till I got to the angled fins, then I just cut them out on the bandsaw for that classic GPR homebuilt look...

Meanwhile... Sleeve has sprouted wings.

Yep folks, still a happening thing, and I can see an end in sight now too.

Latest developments are 6 fins, these will snap fit into grooves machined around the barrel for good engagement. Then welded down the fins seam, or welded to the exhaust port, depending on their placement.

We are having a crack at a two stroke conversion GPR125.

[lodgernz]

Guys, do you think the rest of us ("us" being the majority that far outnumbers you) give a rat's ass about any of this ? We don't. Save it for a PM and stop cluttering up the thread.

I agree. FFS grow up and stick to the subject matter. Personal shit has no place here.

[F5 Dave]

+1. If yer here just to act like a wanker procreate off elsewhere.

[seymour14]

I very much admire the work that has gone into this bike and engine.



If you are bringing it up for the 2 hour I would be very happy to help you run it up on the dyno.

Below are post links to some of the development work done making the cylinder for this very clever bike.

You will have to click on the link to view the whole post and pictures, they are worth a look.

Cheers TZ, has been a labour of love. It got a good first outing at Manfeild the other day, some tweaking happened (not the horrible kind!!), and it ran at the top end for most the day.

The parts for the dyno have been a long time coming, but they are in the country now we are assured, and some real testing should happen within the next few days. If not, the dyno in Auckland may be a great back up plan!

The boys are looking forward to the 2 hour, something to get their teeth into!

[TZ350]

Cheers TZ,The boys are looking forward to the 2 hour, something to get their teeth into!

Looking forward to catching up.

[41juergen]

Guys, do you think the rest of us ("us" being the majority that far outnumbers you) give a rat's ass about any of this ? We don't. Save it for a PM and stop cluttering up the thread.

Fully agree, it's TZ's thread and we all love the discussions and ideas shown here. So if you have personal issues than pls. keep them in PM's and not in a technical thread. It's like kindergarden and the fight about which one has the longest...
PS: also fully agree with peewee and the others, thank's to Wob, Frits and the others helping me to do the next setp in better understanding the hobby we love.

[Flettner]

So it's not really a pre '82 at all then? Seeing as the chassis was built several years ago at best. Where does that leave you? Did they have data downloads in1982? I was doing a lot of drugs then, so can't be sure, but I honestly don't recall it.
I wasn't curious how much the suspension cost, that's a given, more interested in what it costs to make a 'stroker perform like that. Anything like what Bill Buckley was charged?
Between races I chilled with my homies, as my bike was sorted straight out of the van.
I suppose I don't really give a fuck who people think built my bike, because I'm not trying to impress people in order to create a business of it, although clearly I've built a faster pre '82 senior than all but possibly one competitor, so maybe I should.

Do you have anything twostroke to contribute?

[sidecar bob]

Do you have anything twostroke to contribute?

No not at all. I just wanted to call into question why a mildly competitive F2 bike was being touted as a highly competitive pre '82 bike.

[adegnes]

No not at all. I just wanted to call into question why a mildly competitive F2 bike was being touted as a highly competitive pre '82 bike.

Why?


................

[wobbly]

So once again the actual facts are completely ignored and personal abuse takes centre stage.
The whole bike is completely Pre 82 Post Classic Junior legal.
The chassis is a Frepin, designed and first built by Peter Pinion ( in the pic ) and Fred Mclean in 1978.
I have two of the originals here, I jigged off the 350 version, and spent many hours running the design thru FEA and improved
the torsional rigidity to be as good as the best chassis of the day being a Bimota YB3, but its 10Kg lighter.
Unlike the rest of the world we must run period forks - so the legs are off one of only two period bikes with 41mm tubes - an 82 Suzuki GS1000 GK.
They cost $50 off ebay, then fitted with Maxton hi tensile thin wall tubes off ProTwin SV650.
Internals are free, so I fitted 2006 GSXR600 cartridges and KSS did the conversion to NIX20 with all Ohlins stacks and Com on the left and Reb on the right.
We are allowed up to 430cc in two stroke junior, so its a TZ350 - 3G3 six port with a 58mm Banshee crank and Blaster 60mm pistons = 400cc.
I welded CR125 reeds onto the back and fitted an inlet port divider with 2 extra boost ports - externally the same as a Kenny Roberts OW31.
Lectrons are legal flat slides for the period, so it has 40mmHVs.
When I get back from Vegas I will post pics of all the engine mods that will be of interest to the 2T people here.
But just so there is no chance of confusion, here is the crank power sim output - so take off around 12% and you get the final dyno rear wheel power of 82.81
from the video - exactly as it should be.

https://www.youtube.com/watch?v=p8ZJCPXAIyA

PS - if I wanted the thing to go F2 the swingarm would be 100mm longer and have slicks, add a speedshift and then Dennis would do 10s IMHO.

[G10]

Wobbly, it appears your credentials are impeccable!

Thanks to everyone that post here, I check 3 or 4 times a day to see what's new. Please don't stop posting!

[Flettner]

No not at all. I just wanted to call into question why a mildly competitive F2 bike was being touted as a highly competitive pre '82 bike.

Then you might be better off on another forum where perhaps you skill set is more appreciated, this is a twostroke development forum, thank you.

[nodrog:Me]

Then you might be better off on another forum where perhaps you skill set is more appreciated, this is a twostroke development forum, thank you.

No, this forum is kiwibiker.

In which there is a thread about 2 strokes.