ESE's works engine tuner

[RAW]

Drag racing its more important - starting with a relatively cold surface the thinner pipe will heat up quicker.
I could also add that after several huge single malts I just " maybe " believed the VIP storyteller, that thinner pipe walls pulse or resonate more - but who knows, all I care is that they are faster.

Wobbly, whats your thoughts on an entire pipe in 0.6mm mild steel ?
I use annealed sheet when I can get it, hammering not only makes the flow superior but it also is a stress relief method, this can assist with reducing the tendency for cracking

[speedpro]

I've only ever used .8mm MS and can't remember a pipe cracking. I've had little problems with attaching the nozzle at the end of the rear cone sometimes but not because of the .8mm MS. I leave the pipes very loosely mounted and they really rattle around

[wobbly]

When young and silly I built a couple of sets of 0.6mm pipes for LC racing when I worked for JL in England.
They became quite famous, as the last I heard they had won at every meeting and championship going, and were sold several times for over 2000GBP
They certainly were fast and lightweight, but I never was able to get a back to back with exactly the same design in heavyer material.
However every racer was adamant they were the best thing since sliced bread on track.

[TZ350]

Page 790 ....

[Frits Overmars]

... every racer was adamant they were the best thing since sliced bread on track.

Sliced bread on track is a good thing ?

[husaberg]

incisive wit is a kiwis bread and butter........

[fatbastd]

Let's mix a few more metaphors!

Sliced bread and butter on tack? I'd be a pig in sh!t!

[TZ350]

Been away for work for a bit and on the way back managed to get some time at Len Southwards Car Museum.

http://www.southwardcarmuseum.co.nz/



Ok not a motorcycle, but it is air cooled and a V8 to boot.



Just love these big beast engines.

[TZ350]

OK, now for a real air cooled 2-Stroke, Geff Perrys TR500R and Trophies



And Ron Grants water cooled TR750R

[husaberg]

Been away for work for a bit and on the way back managed to get some time at Len Southwards Car Museum.

http://www.southwardcarmuseum.co.nz/



Ok not a motorcycle, but it is air cooled and a V8 to boot.

Guy out at Kumara used to bring in these. They were probably a trade/barter to pay the dairy board instead of currency (like the lada's and Zetors)

Air cooled rugged and 6x6 funny chassis-less articulated or Swing axle rear end as well.
From memory the Big Quarry in the middle of Dunedin used to run them as well.

Air cooled i guess is an advantage in the far northern winter

[RomeuPT]

I gave TeeZee a RS125 A kit pipe I made a while ago in 1mm to the Honda dimensions - it was useless on the dyno, but maybe he can take a pic of the hammered welds at the header to
show how nice it can be done.

Please Teezee!

[Buckets4Me]

Please Teezee!

thats if he can find where it's now hidden

[FastFred]

Please Teezee!

He has been away on site down south, but is back in at work today, guess he will get it done ASAP.

[TZ350]

1mm takes a long time to heat up, and in reverse takes a long time to cool down on trailing throttle into a turn.
0.8mm is the best compromise between weld strength and power. 0.6mm isnt easy to weld with good strength, but it does work "better".
Using thinner sheet at the header, and the end of the rear cone - the hottest areas in a pipe means they will heat up faster, getting the engine onto the pipe faster but also they will cool quicker, equalising to the lower overall temp quicker on the overun.

I gave TeeZee a RS125 A kit pipe I made a while ago in 1mm to the Honda dimensions - it was useless on the dyno, but maybe he can take a pic of the hammered welds at the header to
show how nice it can be done.

The hammer welds on Wobblys pipe are a beautiful piece of work.

[RomeuPT]

The hammer welds on Wobblys pipe are a beautiful piece of work.

Thanks TZ, it is needs a paint