ESE's works engine tuner

[koba]

Have you guys measured up the RS125 pipe?

[TZ350]

Have you guys measured up the RS125 pipe?

We haven't measured ours, but I found this on the net ........... page 270 has a lot of other info too.

[koba]

We haven't measured ours, but I found this on the net ........... page 270 has a lot of other info too.

Ahh, Shit it was right in front of me!

Cheers, I'm just working over pipe designs and stuff, I've grafted a new one on but its still a heavy road pipe, I would like to make a lighter one soon. Still have much other stuff to do on the bike yet!

[TZ350]

Cheers, I'm just working over pipe designs and stuff..........

The maths for Blairs pipe designs are on page 200, for anyone who likes that sort of stuff.

XL spreadsheet for the basic design of an expansion chamber, based on Blairs work ........... The spread sheet...... Attachment 223667

I find the header section the hardest to make, page 200 shows the header section of a RG250 pipe being re used so only some new straight cones are needed to finish the pipe.

[TZ350]

Making progress with my variable V Tech inlet tract and timing. Fitted the divider tonight and bolted it all up.

The plan is to run it up with the valve fully open then fully closed, compare the graphs and manually switch it during a run to see what a dual curve looks like. I am ready to go, just need to get to the dyno.

Hopefully it lasts long enough to see if it has any merit and nothing catastrophic happens, like the divider coming loose and getting caught in the rotary valve.

[Ivan]

are you building a variable timing system?

[bucketracer]

are you building a variable timing system?

TeeZee's inlet idea is like the V Techs dual cam timing, with the rotary valve closing 55 deg ATDC at lower rpm and 85 deg at higher rpm. The size of the inlet tract and hence gas velocity also varies and its hoped both things together will allow the engine to pull well and cleanly from lower rev's.

Last Sat it ran pretty well around Mt Welly using just 2 gears, but TeeZee could see it was blowing back a bit through the carb when Kel was pulling out of the hair pin. With the V Tech inlet TeeZee hopes it will pull cleanly out of the slower corners and with its great top end run from corner to corner without losing time having to change gears and a zing on the clutch will launch it out of a tight spot or enable it to dive under someone if they let the slightest gap open up.

Anyway Ivan that's how I understand it from what Ive heard them talking about here at work.

[koba]

I find the header section the hardest to make, page 200 shows the header section of a RG250 pipe being re used so only some new straight cones are needed to finish the pipe.

Yeah!
Ive got an OK Pipe but its a double skinned roadbike one. I weighed it tonight and it totals 8KG!

I thought I would get the rest of the engine sussed and play a bit, maybe with some different road pipes and shapes and when I have it finalised make a final pipe out of nice light and thin stuff and hope the heat difference doesn't change things too much.

I made this Scatter plot in excel to give a visual depiction of the differences between a few pipes.
It isn't all that accurate but I may slowly refine it.

Note the steep angle of the RS125 baffle.

[Buckets4Me]

when I have it finalised make a final pipe out of nice light and thin stuff

not to thin as this is for a bucket and they spend a fair amount of time on there side

[wobbly]

That old Honda pipe mod drawing is completely useless, it was never used by the factory in any form.The rear cone is insanely steep.
And the so called A Kit pipes were designed to work with high Ex ports - where the customer engines all had 83*ATDC to let them rev without an electric powerjet.
I have much better designs with a ton of dyno time on them, but of course they are all specific to 50Hp 125 cylinders, not 30Hp 100cc designs.
Here is one that has won dozens of 125 kart titles, but again it should just point you in the right direction for the 100.

[jasonu]

Making progress with my variable V Tech inlet tract and timing. Fitted the divider tonight and bolted it all up.

The plan is to run it up with the valve fully open then fully closed, compare the graphs and manually switch it during a run to see what a dual curve looks like. I am ready to go, just need to get to the dyno.

Hopefully it lasts long enough to see if it has any merit and nothing catastrophic happens, like the divider coming loose and getting caught in the rotary valve.

Is that a foam filter in the 1st pic? Be sure to dyno with and without it. I found that any sort of filter or mesh screen cost hp.

[TZ350]

Is that a foam filter in the 1st pic? Be sure to dyno with and without it. I found that any sort of filter or mesh screen cost hp.

No, not a filter, its a wind sheld to stop the wind blowing directly across the open bellmouth and upsetting the carburation. Also in the event of a crash it folds over the bellmouth and hopfully stops realy large rocks being sucked in.

[wobbly]

Here is the A Kit spec RS125 pipe drawing.

[Ivan]

Nice so the valve shuts off at low RPM causing it to change the Inlet port sizing and not overfuel it at low revs? then when you accelarate past a certain RPM it opens right up?

Just guessing ti doesnt have the Vtec sound of the BOOOWWWW then 6k DAHHHHHHHHHHHHHHHHHHHH

I had a 2.2 litre Dohc Vtec Prelude thing was insane!

[koba]

not to thin as this is for a bucket and they spend a fair amount of time on there side

Yeah, I'm quite keen to tuck it out of the way so it would take a colission or real nasty ding to dent it.

That old Honda pipe mod drawing is completely useless, it was never used by the factory in any form.The rear cone is insanely steep.
And the so called A Kit pipes were designed to work with high Ex ports - where the customer engines all had 83*ATDC to let them rev without an electric powerjet.
I have much better designs with a ton of dyno time on them, but of course they are all specific to 50Hp 125 cylinders, not 30Hp 100cc designs.
Here is one that has won dozens of 125 kart titles, but again it should just point you in the right direction for the 100.

You are always full of useful info, cheers.

hopfully stops realy large rocks being sucked in.

Always a Bonus!

Here is the A Kit spec RS125 pipe drawing.

As above