ESE's works engine tuner

[gamma500]

What year RGV500 are those from?

2001, If I remember right. Not 100% sure though...

Here's couple of more pics.

[wobbly]

The 4th cable is to the PV servo as the man from the Institution says - it holds the oil pump open when the PV is open, but the throttle is closed ie high rpm overun into a corner.
Interesting to see in one of the Suzuki pics that it has two servo drives, one for the blade PV and another for the ATAC chamber, they too discovered you cant simply tie them together.

I recon the pipe should be named "Pirranha" looking at the fish impressions.

Blowing a pipe,except for the initial header shape, looses power big time,as the angle changes are blurred.
HRC has the trick method of pressing the pipe in two halves, and welding the seams, as a press tool can imprint distinct "corners" where for example the mid joins the rear cone.
Years ago when working with Jim at JL I tried blowing the pipe into a split mould around the mid section, but even this lost around 2-3 Hp per pipe on Hines dyno at Zip,when testing his Superkart title engines.

[TZ350]

I recon the pipe should be named "Pirranha" looking at the fish impressions.

If its OK with you Wob maybe we could call it "The Wobbly Pirranha" and if its ok with him, use dinamik2t idea for the logo ....

[dinamik2t]

You needn't have to ask...

In front of the mouth you should put a cup with the category's name.

[crazy man]

The 4th cable is to the PV servo as the man from the Institution says - it holds the oil pump open when the PV is open, but the throttle is closed ie high rpm overun into a corner.
Interesting to see in one of the Suzuki pics that it has two servo drives, one for the blade PV and another for the ATAC chamber, they too discovered you cant simply tie them together.

I recon the pipe should be named "Pirranha" looking at the fish impressions.

Blowing a pipe,except for the initial header shape, looses power big time,as the angle changes are blurred.
HRC has the trick method of pressing the pipe in two halves, and welding the seams, as a press tool can imprint distinct "corners" where for example the mid joins the rear cone.
Years ago when working with Jim at JL I tried blowing the pipe into a split mould around the mid section, but even this lost around 2-3 Hp per pipe on Hines dyno at Zip,when testing his Superkart title engines.

so here in pic 1 is not the way to go (blurred) and plended ? and pic 2 is the way to go? both are cone type chambers
http://images.trademe.co.nz/photoser...70289_full.jpg
http://images.trademe.co.nz/photoser...70413_full.jpg

l know what l would use!

there is no right or wrong way its what works on your the best!

[wobbly]

Look closely - Pic 1 has a blown or pressed header first section, the rest are segments.
Pic 2 are just a pieces of shit - I would be embarrassed to even have them in my rubbish tin, let alone have a pic of them on the interweb & no
the drastic cut angles would shag any pretence of power the design may have had initially,probably make about the same power as blown pipes would..

[TZ350]

24mm OKO carb bored out to 30mm so now I have a carb to do a back to back comparison with the taper bored 24 OKO on the dyno.



Surface is deliberatly left rugh, the theory is that the air flowing over it rolls up and forms little rollers for the bulk air to slide over.

[F5 Dave]

Ahh, just like those old english Anal roughbore carbs,

be interesting to see what happens.

[wobbly]

Just a small point TeeZee, the elongated oval formed around the main air corrector feed hole you will need to fit a thin wall sleeve in there, pointing directly out the bellmouth to a point where its not
affected by the venturi .
The idle air is going to be affcted as well but not as drastically.
If you dont, the air corrector orifice will be subject to increasing negative pressure as the velocity increases - exactly the opposite to what is needed to lean out the fuel curve
that naturally gets richer in any carb like this.

[husaberg]

I just read an article that suggested the NSR250 (Well the MC28 at least)
has a three position RC Valve it suggests it has a fully open a closed and intermediate position can anyone confirm this?
As i always assumed it was an either open or closed scenario only.If it is a 3 postion. Is this only the MC28 or other models as well?
The MC28 i believe has a TPS which is a 4.8K linear pot (even though it has written 4K on it?)

[bucketracer]

Just a small point TeeZee, the elongated oval formed around the main air corrector feed hole you will need to fit a thin wall sleeve in there, pointing directly out the bellmouth to a point where its not
affected by the venturi .
The idle air is going to be affcted as well but not as drastically.
If you dont, the air corrector orifice will be subject to increasing negative pressure as the velocity increases - exactly the opposite to what is needed to lean out the fuel curve
that naturally gets richer in any carb like this.

30mm OKO and the 24mm OKO taper bored out to 30mm on the engine side.

Thanks Wob, TeeZee and I have been playing with the taper bored 24 on the dyno and were about to try the 30 ......

[bucketracer]

Very quickly, with fins , look at the heat path and the materials it crosses, also the air flow between the fins , and the amount of heat each fin can remove,

Heres a paper on fins , hope this helps

Stephen

Very interesting paper, I see 8mm gap between fins on a moving motorcycle is the magic number .....

[2T Institute]

30mm OKO and the 24mm OKO taper bored out to 30mm on the engine side.

Thanks Wob, TeeZee and I have been playing with the taper bored 24 on the dyno and were about to try the 30 ......

Like so(I have to make this post longer than 10 charaters, but I have SFA to say ..............)

[bucketracer]

Hi 2T any chance of a side on pic so we can see how far forward the little tubes protrude. Thanks B

[wobbly]

The NSR has a single dropping gate PV system, so saying it has "stages" is bollocks.It is servo driven up and down, and by design it is always close to the piston to work well.
The RGV has a multi blade system that pulls the valves away from the bore in stages, as in this case only the leading edge in the full down position is close to the piston.
Any value of pot in a TPS would work - all it does is vary the 5V sensor voltage sent out by the ECU.