ESE's works engine tuner

[TZ350]

.

Hi Chambers I remember you talking about making a carburetor that was a simple tube with a plug.

Look at the link that Bucket posted, http://www.prvperformance.com/PRV_in...l_overview.pdf

The right hand picture shows a system like you were describing.

I think your idea is good and will give it a try.

.

[TZ350]

.

Found that an old Honda RS125 pipe is close to what I need for my new engine and has the right tuned length and other features for making max power at 9,500 rpm on my GP.

Pic-1 welded a new flange to the header
Pic-2 the RS pipe tucks under the frame realy nicely with out having to change anything
Pic-3 pipe was cut at the mid section seam and turned so that the exhaust exits at a better angle

All in all it was very easy to fit the RS pipe to my GP.

With all the porting work and the new RS pipe the hope is we will get a wider power band and 20 possibly 22RWHP at 9,500 rpm. I am still 2-3 weeks away from getting the bike on the dyno, but very much looking forward to seeing how it all works out.

I have kept the old motor and pipe complete so that I have something to fall back on if the new motor turns out to need more development.

.

[F5 Dave]

Those old RS pipes tend to want to rev & rev & rev (good for top speed, not always so good for cranks).

[bucketracer]

All in all it was very easy to fit the RS pipe to my GP.

Whatttttttttt........No way TZ

can you take a pipe from a high revving high power motor and fit it to a low spec plonker and expect it to work.

.

[Buckets4Me]

Whatttttttttt........No way TZ

can you take a pipe from a high revving high power motor and fit it to a low spec plonker and expect it to work.

.

next you will be telling us that your not ment to slap a supercharger (not an expantion chamber) on an old heap of junk either ?

do us a favor and wave as I leave you behind at the start line

[sonic_v]

Is that the rs pipe from a 88-94 bike. I seem to recall that this pipe had a tuned length of about 816mm. Even with a low exhaust port setup I suspect your engine will peak at 10,500 revs plus.

[Buckets4Me]

10500rpm is closer than the 11400rpm they peak at now

http://www.kiwibiker.co.nz/forums/at...1&d=1255490661

[jasonu]

I fitted a 1991 RS125 pipe to my RG KE 100. It makes 22HP at the wheel at 10500 rpm with no over rev, it just stops dead at 10500. I have another pipe from an old TZ500 GP bike. It makes 25hp at 11200 and holds it until 11600 and will go to 12000. Both pipes give good low and mid range power and have some what similar curves. The RS pipe starts makeing power a bit sooner but as I said, not as much top end and signs off sooner

[TZ350]

.

Whatttttttttt........No way TZ

On Page 95 post 1417 I tried to explain my understanding of how the three things, rpm, ex duration and ex temperature affect the tuned length required. And the tuned length requirements of a low speed plonker can be the same as a high power racer. Other things like the header and mid section diameter and angles of the diffuser and convergent cone and stinger could be different though.

Is that the rs pipe from a 88-94 bike. I seem to recall that this pipe had a tuned length of about 816mm. Even with a low exhaust port setup I suspect your engine will peak at 10,500 revs plus.

Yes 88-94 chamber I think and you could be right about the tuned length, I found it very hard to measure the imaginary center line that runs down the length of the chamber accurately.

10500rpm is closer than the 11400rpm they peak at now.
http://www.kiwibiker.co.nz/forums/at...1&d=1255490661

I think if I can get the power to peak at lower rev’s and improve the plugging efficency like SS90 discribes then the 24mm carb restriction will be less effective at suppressing peak power.

I fitted a 1991 RS125 pipe to my RG KE 100. It makes 22HP at the wheel at 10500 rpm with no over rev, it just stops dead at 10500. I have another pipe from an old TZ500 GP bike. It makes 25hp at 11200 and holds it until 11600 and will go to 12000. Both pipes give good low and mid range power and have some what similar curves. The RS pipe starts makeing power a bit sooner but as I said, not as much top end and signs off sooner

That’s very interesting, could the difference between the RS pipe stopping dead on your bike and it reving on, on an RS125 be the retarding ignition that the RS uses? do you have any dyno graphs or dimensions of the pipes you could post?

.

[speedpro]

I was in the kart shop the other day and they had pamphlets on the wall for 100cc engines with either crankcase reed or rotary valve and were quoting 28-30hp with a 24mm carb at 20,000rpm. So I figure if you spin the GP to 20,000rpm with the extra capacity you should be looking at up to 37.5hp, eh?

[Buckets4Me]

I was in the kart shop the other day and they had pamphlets on the wall for 100cc engines with either crankcase reed or rotary valve and were quoting 28-30hp with a 24mm carb at 20,000rpm. So I figure if you spin the GP to 20,000rpm with the extra capacity you should be looking at up to 37.5hp, eh?

stop that now Speedpro
been down this path and it cost $$$
dont get him started again

[bucketracer]

.

On Page 95 post 1417 I tried to explain how the three things, rpm, ex duration and ex temperature affect the tuned length required.

And the tuned length requirements of a low speed plonker can be the same as a high power racer.

.

yep I went back and read it carefully, I see what you mean.

.

[SS90]

Just as a matter of interest Teezee, what cylinder head design are you using on the new cylinder?

[F5 Dave]

stop that now Speedpro
been down this path and it cost $$$
dont get him started again

Well clearly that was a PT by Mike, Kart engines & parts aren't legal (aside from where free rule like pistons, ignitions).

Also no gearbox losses.

[jasonu]

That’s very interesting, could the difference between the RS pipe stopping dead on your bike and it reving on, on an RS125 be the retarding ignition that the RS uses? do you have any dyno graphs or dimensions of the pipes you could post?

.[/QUOTE]

I'll do my best. However, it was built 10 years ago, I now live in the States and the graphs etc are at my mates place in Titirangi. But I will try.