ESE's works engine tuner

[husaberg]

Building a BRC YZM500 2 stroke

Riley Will....
Congrad's thats a quality piece of kit i had seen some of the stuff a while back but a Balance shaft and modern chassis and Decomp pv and case reed.

[Flettner]

Something you dont see every day, a nitrous CR500. Because death cant come quick enough...... I guess😁.

[Henrik Y]

A little update on my gearbox swap. I've been riding it for a bit this summer and it seems to work just fine. Better overlap so I could push the powerband a little higher and current top speed which I've only tried once is almost 170km/h, could probably push a little more but I'll stop there for now as I'm happy with it and it performs well on the small country roads I ride with it. It's fast enough to get dangerous.








So I cut the side of the engine case and widened it. Also had to widen the outer cover as well for the chain to clear the clutch cylinder and braced it to make it stiffer as it was flexing when clutching. The selector drum required most modification, had to resize one side, cut it in half and add a bit for the gear points or whatever you call it. It was a lot of fiddling back and forth but in the end it worked out pretty well. Had to correct some slight warping of the case as well after the welding.

[Henrik Y]

I built a new pipe for a little more peak and higher revs.


And now I can bring my legs as well


Hope to get it painted next summer.

[Peter1962]

If I may ask : why did you choose to weld, and not use a spacer plate for widening the cases ?

[Henrik Y]

If I may ask : why did you choose to weld, and not use a spacer plate for widening the cases ?

Then you have to widen everything else. Frame, cylinder, crank and so on.

[wobbly]

After using the FOS 2T power correction algorithm in my latest dyno tests , that gives much more realistic power numbers ( for example high mBar ambient air - I had an unbelievable 1040 the other day )
I have discovered that JIS D1001 correction gives almost identical results.
This might be useful on dyno software where the FOS code cant be inputted.
Ive got no idea what the correction data is for this , but it does seem to be much closer than any of the others commonly available.

[TZ350]

2Stroke Stuffing and a new direction with a new centrifugal blower.

[porttiming124]

After using the FOS 2T power correction algorithm in my latest dyno tests , that gives much more realistic power numbers ( for example high mBar ambient air - I had an unbelievable 1040 the other day )
I have discovered that JIS D1001 correction gives almost identical results.
This might be useful on dyno software where the FOS code cant be inputted.
Ive got no idea what the correction data is for this , but it does seem to be much closer than any of the others commonly available.

I'm happy to learn that the JIS correction is close to that of FOS because I asked Land and Sea (dyno) to integrate the FOS correction into my software and they don't seem to be interested. Thanks for sharing your tests.

[wobbly]

Man thats crap customer service from L&S , imagine the hundreds of their dynos that are 2T dedicated.

[Flettner]

360 ready for a ride, finally.
TPI mk2, E85 fuel, reverse rotation crank, sliding gib throttle / valve timing, reverse cylinder, double counter rotating balance weights, autolube direct to the bigend via an airstream, electronic guillotine type powervalve, water cooled crankcase, toridal head with an 8mm spark plug.
It goes pretty good around the yard.

[ken seeber]

360 ready for a ride, finally.
TPI mk2, E85 fuel, reverse rotation crank, sliding gib throttle / valve timing, reverse cylinder, double counter rotating balance weights, autolube direct to the bigend via an airstream, electronic guillotine type powervalve, water cooled crankcase, toridal head with an 8mm spark plug.
It goes pretty good around the yard.

Shorelee Fletto, you could have thought of some other things to add to the list........

That aside, well done...

[Pursang]

Shorelee Fletto, you could have thought of some other things to add to the list........

That aside, well done...

Fletto.....Well done!!

[Flettner]

Remind me, what was the BMEP of the Aprilla RSA 125?

[husaberg]

Remind me, what was the BMEP of the Aprilla RSA 125?

At around 53 or 54 the works Norton Manx had BMEP value of almost 14 bar or 200psi at 7000rpm
but to be fair they had nearly 4 times as long to fill the cylinder compared to to a 125 2T 14,000RPM

According to Frits for the Aprilia RSA125 the BMEP was 17 bar
http://www.pit-lane.biz/t117p820-gp1...-part-1-locked