ESE's works engine tuner

[F5 Dave]

Attachment 239753
. . .. The plan is that below 7k the Ignitech activates the relay and allows the pulses from the servo tester to tell the servo to close. .

WHY??!!? What kind of drugs are you on? So you might get a boost when the engine is making say 7hp? RG50s will be whipping past you. Or you could just keep it above 9 & enjoy a splendid power range. 8 if you must.

If you could get it to work quickly enough 11.7 would be good. Seems odd that it makes that good power closed. Did you do those runs back to back?

[TZ350]

Seems odd that it makes that good power closed. Did you do those runs back to back?

Closed to 7 then open all the way, Thomas had the job of pulling the valve open at the right time.

The runs were not back to back as it took a few nights after work to fit the original V Tec valve, but there were no other changes except it idled better with a smaller pilot jet.

I can't explain the hint of extra power at the top, I hope its still there and can be developed further when we get the thing back together.

[F5 Dave]

a hint? 1/2 a hp for 1500rpm is more than a hint. it kind of indicates something like timing, or perhaps jetting or temp is different.

But again, why do you care what sort of power you are making at 7000 seeing as its so little? Pit exits for warm up lap?

[TZ350]

a hint? 1/2 a hp for 1500rpm is more than a hint. it kind of indicates something like timing, or perhaps jetting or temp is different.

If its a real improvement and still there on the next dyno run. My best guess is the kicker at the end of the divider is better at directing the air flow in behind the conrod as the rod sweeps across in front of the inlet port during the induction cycle and this re-directed air flow better balances the incoming air/fuel mixture between the left and right side transfer ducts.

why do you care what sort of power you are making at 7000 seeing as its so little? Pit exits for warm up lap?

When I started the V Tec project I was hoping for FXR like power at 6-7k but all I got was vastly improved carburation from 3k to the 7-8-9k region, a lot of work and not what I was aiming for, but still worth having.

Now I see the big advantage of the smoother low end power delivery as, that it will now be possible to get on the gas much earlier, something the FXR's do well and it should realy hall arse out of the corner, something the FXR's don't do so well.

I guess now with the better carburation, I will also be able to explore later valve closing, like 88 deg ATDC for greater over rev.

But again, why do you care........

A good clean pickup on the carb for a fast start is everything with Buckets, especialy when running a Stroker at Mt Welly.

[Buckets4Me]

But again, why do you care what sort of power you are making at 7000 seeing as its so little? Pit exits for warm up lap?

maby so he isn't left on the start line (like someone at Taupo a few years ago)

even I managed to pull half a lap on you before you got going

[F5 Dave]

So. . .do you launch at 7000rpm? no you don't do you?

Yeah that sucked at Taupo. The pwk carb tended to flood more than my old Mikuni. However after screwing around for ages it turned out the real problem was the clutch inner basket grooves were so prominent they wouldn't allow a race start without dragging on & off. This loaded up tegh 1/2 piston port engine worse than it would a reed one.

Heck after a decade of abuse of the worst abused clutch in bucketdom, - something had to give.

Had it fixed for when Av rode it though.

[TZ350]

So. . .do you launch at 7000rpm? no you don't do you?

Too true, but I also don't sit on the line at launch rpm waiting for every one to sort themselves out.

A loaded up engine doesn’t launch well at any rpm until its cleared its throat, it may only take a moment, but that’s a moment too long for any sort of a fast start.

Making a fast start is all about paying attention to detail and going to some trouble with engine setup.

And I am used to making very fast starts, Ill show you how its done next time your up this way.

[SS90]

Too true, but I also don't sit on the line at launch rpm waiting for every one to sort themselves out.

A loaded up engine doesn’t launch well at any rpm until its cleared its throat, it may only take a moment, but that’s a moment too long for any sort of a fast start.

Making a fast start is all about paying attention to detail and going to some trouble with engine setup.

And I am used to making very fast starts, Ill show you how its done next time your up this way.

its true that for the top bunch if guys in any class, the race is quite often won on the start line, but in this situation, it hardly seems like an issue.

[F5 Dave]

Oh look Neil has shown up. They finally let you out of rehabilitation?

Yeah I'd agree that a good start is important. But usually there is a clue like some kindly gentleman holding up a flag a few seconds before. Then in typical Auckland fashion someone launches & the flag drops.

[kel]

But usually there is a clue like some kindly gentleman holding up a flag a few seconds before. Then in typical Auckland fashion someone launches & the flag drops.

Ah you know how it works up here then - we can't wait for the flag to drop, if we did that half the front row would already be at the first corner!

[jasonu]

Then in typical Auckland fashion someone launches & the flag drops.

That was Mark, wasn't it???

[F5 Dave]

Ah its just as often one of the Dips. You'd think I'd learn after all this time, when in Rome.

In Woodville MX races Gosimer was telling me (he used to go up as the starter when he was big in the Manuwatu Onion club) if you jump the start a couple of times they start you off facing the wrong direction.

[bucketracer]

Ive read about this motor configuration before http://vincentcrabtree.co.uk/XR200.aspx Would have been a weapon pre FXR (as far as four strokes go).

Because Team ESE also enjoy 4-Stroke technology and have a few XL/SL100 and 125 engines in a big box somewhere, we flogged this link and posted it here for future reference, thanks Kel.

[husaberg]

[QUOTE]

Wobbly; have you played around with the more modern Exhaust servos? say a ZX6r??
I'm assuming/hopeing that they run on a similar config/wiring as a Yamaha powervalve servo.
And given heaps of people have been cutting them out (seems to be a common so called improvement) there should be a nice supply of them sitting around the place...

This would work I think?

[wobbly]

Yea well the windscreen motor off a split screen Morris Minor could be made to work as well.
That version has the poxy single bearing setup, same as ZXR, but is even worse in that it only drives a single cable off the pulley,thus needing spring return.
The newer R1 version of the RZ servo has really good bearing supports in the case for the shaft and has push/pull - just buy one.