ESE's works engine tuner

[wobbly]

Wrong - a racing motorcycle engine can be very closely modelled near reality if the inputs are good enough.
The powervalve and ignition curve can then be transferred directly to the ECU, the thing can then be run in, and thrashed to death on the dyno.
All that is needed is fine tuning of the fuelling and ignition for best power.
Then go to the track with no fear that it will melt down if the best power egt numbers are programmed into the red lights on the dash to indicate where the jetting stands.
Look up RZ400 on UTube.
After that dyno session it went straight to the track with the same jets and setup, ran 4 off 20 minute sessions at full noise the whole time.
Needed one jet change on one side to get equal egts at 1245F.
Gearing and part throttle response is the game at the track - not development.

[twotempi]

I think they were running it on Methanol at the track when you had set it up for petrol !! Ain't going to work without proper testing, and is rather dangerous too.

By all means do your final tweaks at the track but it is no place for major changes such as a change in fuel.

And as an aside I seldom see a successful track-side rebuild of an engine. Most of the time it just ruins another perfectly good piston !!

The GP teams might manage it but club racers normally get a "fail"

[Grumph]

I've said it before but it bears repeating = Pro engine building #101 - Picking your customer....

Anyone who will buy me a drink can have the story of why I call Johnny Hepburn "heartburn"

The Arrow made it to the South Island once. Finished some of it's races, looked good but not particularly fast...Detuned ?

[bucketracer]

Look up RZ400 on UTube.

[richban]

Hooked

Well I just spent the afternoon riding a couple of RGVs around at Manfield. So totally hooked on the things now. The handling was a bit poo, but when on the pipe I just wanted the fun to never end.

How many ponies do you {you being the people that know ie not me} could squeeze form an RGV250? I think one had a good 65 maybe and the other maybe low 50"s

So much fun. I see why you are all so mental now.

[Moooools]

Wrong - a racing motorcycle engine can be very closely modelled near reality if the inputs are good enough.
The powervalve and ignition curve can then be transferred directly to the ECU, the thing can then be run in, and thrashed to death on the dyno.
All that is needed is fine tuning of the fuelling and ignition for best power.
Then go to the track with no fear that it will melt down if the best power egt numbers are programmed into the red lights on the dash to indicate where the jetting stands.
Look up RZ400 on UTube.
After that dyno session it went straight to the track with the same jets and setup, ran 4 off 20 minute sessions at full noise the whole time.
Needed one jet change on one side to get equal egts at 1245F.
Gearing and part throttle response is the game at the track - not development.

Better still use an AC dyno and simulate the whole lot based on data collected from previous race meets.

That is what we are planning to do with the car next year when we have the AC dyno set up at the Newmarket campus. All simulated on Ricardo wave (A dirty 4 stroke equivalent to Engmod 2T except about 100x the retail price) and then onto the dyno for testing of a complete lap or race, gear changes and all. F1 have been doing it forever but it is not exactly easy to do on the cheap.

[F5 Dave]

Std good one 22 =52, F3 tune were getting 70 so there's your target, but it's a fair go of it.
Come to the light side Rich

[richban]

Std good one 22 =52, F3 tune were getting 70 so there's your target, but it's a fair go of it.
Come to the light side Rich

Yeah I am still bathing in the light.

Ok 70 sounds good. On it. Ideal squish band angle anyone? I hear there is a good pipe design guy lurking on this thread. Wonder what he might have for an RGV VJ 22 lying around in Tauranga?

[Grumph]

Std good one 22 =52, F3 tune were getting 70 so there's your target, but it's a fair go of it.
Come to the light side Rich

Many moons ago when those things were new, Suzuki NZ imported one direct from the Japanese F3 wars. They sent it to Grant Ramage who was leading the 250 prod champs on one. It wasn't particularly fast so it got sent to a NI tuner...who now tunes the bouncy bits of bikes. Grant got it back in time to bring it to a meeting at Wigram. Goes out in first practise and it comes back on a trailer. He was pitted next to us so i was interested...He pulls the heads off, grunts and says "thats fucked" and proceeds to get his proddy bike ready.
I ask what's happened and he says have a look...colours are good, bores look ok pistons intact - I ask again and he says look closer...
The arrow marking front on the bottom piston was pointing to the left side of the bike....Broken rod I assume.
I believe it was shipped back to Suzuki NZ....I never heard of it or saw it again

[F5 Dave]

Suzukis never seem fantastic with cranks. Keep the revs safe and should be fine. That's mx pwr from a proddy bike so totally feasible.

[richban]

Suzukis never seem fantastic with cranks. Keep the revs safe and should be fine. That's mx pwr from a proddy bike so totally feasible.

From what I have read so far. Looks like the port timing is out by .9mm from stock. So I can fix that with raising the barrels. Then I want to find the best cylinder head shape and raise the compression. I have some wossner pistons lined up for when I find out how bad / good the barrels are. Some good pipes and away we go.

That will take up most of the budget I think. shoe string

[speedpro]

Can't remember what model cylinder/head but I sleeved down a RGV cylinder for my bucket. Eventually I had the head welded and reshaped to conventional squish and chamber design with the plug upright in the centre. With everything else identical it instantly made about 10% more power and had more under the curve everywhere.

[richban]

Can't remember what model cylinder/head but I sleeved down a RGV cylinder for my bucket. Eventually I had the head welded and reshaped to conventional squish and chamber design with the plug upright in the centre. With everything else identical it instantly made about 10% more power and had more under the curve everywhere.

Cool. I have my eye on some SP heads. centre plug. Not sure if these is much difference in the squish band width or angle.

I will be back tracking through this tread a lot I think. Gold digging as there is so much of it. Maybe to much for the novice.

[husaberg]

Rich what class will you be racing in?

[F5 Dave]

I was going to say centre plugs and shorts. Maybe igni and some KX carbs with proper solinoids or maybe some old TZ carbs?