ESE's works engine tuner

[TZ350]

OK I had a look on My Laps and best as I can tell, typical times are ........

Prolight, Steet Stock and F4.

Pukekohe times 1:23 to 1:30 mid pack, best speed 123 down to 114 mid pack.

Hampton Downs 1:37 to 1:50 mid pack, best speed 102 down to 88 mid pack.

Taupo TRRS 1:32 to 1:48 mid pack, best speed 85 down to 73 mid pack.

I expect the speeds are kmh, and the average for a lap.

NedKelly on his Team ESE bike scooting along at Taupo.

Taupo and Hampton were wet, not sure about the conditions at Puke.

[cotswold]

[QUOTE=Buckets4Me;1130129310]Found this hiding on you tube



That's just dangerous!!!!

[Buckets4Me]

Found this hiding on you tube






maby with a few 2 strokes it can look like this

[Buckets4Me]

and

[TZ350]

Found this hiding on you tube

Great clip of Damion and friends with their FXR150's at a Pukekohe Test Day.

Interesting speed comparison with what looks like Alistar Wilton on his TZ750, (Black & Yellow leathers on a Yellow bike).

[TZ350]

Found these pictures of a Suzuki GP100 cylinder (the blue pen label is wrong).

F5 Dave talked about a 3 port GP cylinder but I had never seen one.



All of ours are like this underneath, no big third port, ours have side ports feed from the main transfers and a gash port feed by the piston at the rear, I thought they were all like ours and that F5 had been mistaken .......

[F5 Dave]

yeah it had been a while since i had seen one I just remember they were a bit queer & thought they were like the old GTs. Boost port is biggest weakness I can see, but I think you've approached that.

[ac3_snow]

what is a better gasket sealant to use on an exhaust? I have yet to stumble across a good one.

[Gigglebutton]

what is a better gasket sealant to use on an exhaust? I have yet to stumble across a good one.

I o ringed my pipe but have use high temp silicon. Seams to work ok

[speedpro]

I'm using high temp o-ring and hi-temp red silicone.

[husaberg]

Fast Freddies 500 tripple had them on 2 cylinders as well, but I found that the combo of independent atac and PV was the shit.
Adding them to a non PV cylinder is an easy way to gain a heap of free bottom though.

I was thumbing through some old mags looking for aprilia frame pics and came across
an abridged copy of an article on the history of Cagiva.I wish I had the whole one.

But two thinks leapt out at me.
The first was that Cagiva had ran at rear facing disk valve on a modified Yamaha tz500/4 crankcase ala the modern RSA engine in 1981 .Also the 1984 rotary valve v4 YZR500 ran the same thing.
Second thing was in 1989 Cagiva ran both ATAC style chamber and a rotary power valve.
It a great shame Cagiva could never stick with and develop one idea at a time, but they sure were beautiful.

I sometimes wondered if Cagiva was in a way a defacto R&D department of Yamaha.
Esp when you hear rumours of most of the major internal parts being interchangeable.

Maybe Wobbly might be able to shed some inside information on this.

For TZ why does your gp100 clinder have 123cc cast on it first line. third fom the right?
The porting looks kind of like an MZ125 I will post a pic latter.(note the offset squish band but it was the 60s)Edit it doesnt look that close afterall but there is a port I can't quite figure out in the MZ anyway.?
Also looking though the old posts Up to pg 160 odd now the disk valve duration you had then is bloody close to the MZ125 too (1962) it ran inlet opening 140 btdc 70 atdc. He was a clever bugger that Walter Kaaden.
His rotary valve seemed to be large enough for the inlet to clear the crankwheels too.

PS for AC Snow
I used black silicone (It was all that was handy,but I am sure the proper stuff would be better but it is a bucket.)
With a std honda alloy/fibre ring gasket with a overlaping male bolted to the cylinder and female spigot joint on the header with no steps and springs for my headers the silicone used to pong a bit for a start off but didn't leak.

[diesel pig]

I agree with spreedpro it's got to be the RED Hi-temp silicone.

[Gigglebutton]

I use a silicon based lubricant on the O-rings. This is hi temp & soooo slippery

[wobbly]

Yamaha helped Cagiva out alot in the last couple of years they were competing with port and pipe design.
The Yamaha factory were just getting into using CNC ananometric flow visualizing, and were at the stage of being able to predict the performance of a cylinder layout without the need for a dyno run.
I dont know what the financial situation was but the head of Yamaha racing dept at the time whos ringlish name was Suzan spent alot of time with the Cagiva tech guys.
But then they went all Italian as usual and were spending a fortune on injection - when they had never really got the carbed bike to work to its potential.
Foggy rode it for 3 laps and pronounced it a piece of shit and walked away.

[F5 Dave]

Where the heck would GP racing have been without Yamaha? The Cagiva example is only a small footnote. They have long provided the bread & butter racers & wouldn't have been making much profit if any at all due to constant spec changes & minimal numbers compared to roadbikes. However they considered it good for the sport & presumable gets their name out there if they fill much of the grid -even if they know most people only remember who won.

The TD TZ range kept privateers running & of course the ROC & Harris 500s were viable with Yam supplied engines. This action staved off moves to allow big production F1 bikes to fill the grids which would have diluted the whole concept of GP. Some ideas keep rotating around though huh?

They also did oddball things, like specifically not hiring Schwantz as they saw it as good for the sport not to have all the gun riders on YZRs.