ESE's works engine tuner

[Bert]

Making your own, your a true Buckateer.

The ones you buy look fancy but I am sure with some carefull work you could make something that works just as well. TeeZee recons, if your making your own, something made of steel and welded to the top of the damper rod would be better than the store brought ones that just float on top.

I'm sure I posted up a link to an old Norton/AJS Race emulator built here in NZ (post link when found again..) it actually showed all the dimensions if I recall correctly.

but here is the theory behind them (this really suits the type of forks we all use):
http://www.racetech.com/HTML_FILES/VINTAGETHEORY.HTML

or for $85 USD:
http://www.ebay.com/itm/Front-Fork-D...item53e85ff27d


this post isn't designed to stir-up discussion by NZ suppliers on their product being better as in other threads, please..


Gearing Calculator (this is quite cool for those that can't find the ratios):
http://www.gearingcommander.com/

[wobbly]

Here is a first shot at the GP125 with triple Ex ports Vs the single port version.
The single port has alot higher Ex timing and I thought that the 3 port would give better spread, if I lowered the timings and reduced the STA a bit.
It did , but lost alot of overall power in the process.
Both are using the same pipe,but the lower port in the 3Ex version lets it rev on better.
You can see the big jump in blowdown pressure entering the transfers of the single port engine when in the overev region.
Niether files are fully optimised, but are getting close.

[TZ350]

Wob, thanks for looking at my EngMod2T files.



It will take me a bit of time to make a pipe to your design but I am close to trying the single port setup you have suggested using my old RS pipe.

I am not sure what I should allow for losses, I have used -12% on the RS graph and get 32 rwhp. I should get a chance to put it on the dyno in the next day or so, so fingers crossed and we will see how it works out.

[TZ350]

Here is a first shot at the GP125 with triple Ex ports Vs the single port version.

Yes ... I found much the same, the triple port was not much better than the single when they both had to suck through a 24mm carb but when a biger carb was simulated the tripple produced more power up top and significantly more drive down low.

If they are both limited to a 24mm carb and similar power curves, then a good reason for making a tripple port cylinder would be for mechanical reliability with the triples main ex port width at 62% of bore diameter instead of the singles 75%.

[Yow Ling]

So if the 24mm carb is a problem where does to 100cc engine with unlimited carb sit
Apart from the water cooling is the 25cc penatly worth it?

Would it be really difficult to input the gp100 barrel into your engmod and compare it with a similarly ported 125 barrel with the different carbs

I realise that Speedpros engine is around 30hp and TZs is around the same but they are quite different motors

[Buckets4Me]

So if the 24mm carb is a problem when does the PLENUM! come back

there fixed it for ya

[TZ350]

So if the 24mm carb is a problem where does to 100cc engine with unlimited carb sit Apart from the water cooling is the 25cc penatly worth it?

Red-Speedpros 100cc engine Green-TeeZee 125cc

Yes I think it is, when chasing Speedpro at Taupo the better low down drive felt like an advantage coming off the sweeper.

[jasonu]

since everyone reads this how many mm of front travel are you guys needing and what weight oil trying to sit here andfigure out a new front end for my build but want to know how much travel im going to need first was thinking 20w oil would be abit hard but should slow the front end dive down under braking and reduce the ammount of travel the bike would use

Why don't you measure the travel of your NX4 RS125 forks? Since you are copying the frame I would have thought that might be a good place to start.
FYI my 1995 RS125 forks have 135mm of travel.

[Ivan]

i did look at that but thought since they are cartridge usd forks everything would be totally differnt hence why I asked considering most guys run conventional forks


Sorry for the thread Hi Jack back to were you were!

[TZ350]

Striped the engine down today after the Taupo GP



I was having trouble in practice, the bike just did not run right, Andrew A suggested a windbreak in front of the carb and when I get a chance, to fit a still air box, the windbreak worked a treat.



The head and cylinder look OK but look like they have been a bit hot and the front engine stay has cracked through.



The power started to go soft and I thought it was that heat fade aircooled engines suffer from. But when I got the barrel off I found the ring had become jamed in the piston on one side. I am not sure whats caused this, its as if the area around the ring land has become swollen and partialy siezed??? Its a piston from a water cooled engine, maybe the cam and taper aren't suited to air cooled duty.

Hopefully get this sorted tommorow, free the ring up and give the piston a bit of a buzz around the ring land, fit the new cylinder and then its up onto the dyno after I dig the dyno out from under a big pile of stuff.



Yep ... its under that lot somewhere .....

[husaberg]

Not written by Alan Cathcart either.
I finally figured wh he used be able to Blag so many exotic bikes the other day. Not just because never never said any thing bad about a bike either.
It turns out he went to all the factories in Italy when he started out writing features. He also, as it turns out had a fairy major advantage over most of the rest of us. He spoke fluent Italian.

[Pumba]

Just for a wind up, was reviewing a few old threads.

Its been a long time since a 4 stroke won a F4 GP so 4 stroke riders should cherish last Saturday, it might not happen again for a while.

Date was 2008

[husaberg]

Just for a wind up, was reviewing a few old threads.



Date was 2008

In response to your wind up.

What year did they bring in the 155cc rule? and what year did they bring in the 140cc rule?
Maybe the two stroke may need some more capacity as well? Or larger control carbs?

[Kickaha]

Maybe the two stroke may need some more capacity as well? Or larger control carbs?

With 30HP two strokes appearing we know neither of those is neccesary, they just need to be able to finish races

[koba]

With 30HP two strokes appearing we know neither of those is neccesary, they just need to be able to finish races

I agree, I'm happy with my chances with the plans I have. Just need another ten years to get them sorted.