ESE's works engine tuner

**wobbly** · 27th June 2011, 14:32

From memory the actual number was near 38%.
But ski engines are limited to only around 8000 rpm due to the pump cavitating, so the chambers added all that extra grunt at 4000, and I think the valve closed at 6200.
The pipes arent that clever in that usually the diameter is limited by the amount of room available.

**F5 Dave** · 27th June 2011, 15:04

Heck it was hard enough to get my 496's pipes to give reasonable clearance & fit the bike even with a self restrained dia. Can't imagine a modern TZ750 if such a thing existed being given free rein for pipe design. Actually did that 1100 triple Steve had on his site get past photoshop? That would be silly pipes.

**richban** · 27th June 2011, 19:38

Originally Posted by F5 Dave

silly pipes.

How about these silly pipes. V8 anyone. Wasn't this what you wanted to put in your van Dave.

**bucketracer** · 27th June 2011, 21:05

That reminds me of a story Dad tells of Bob Haldane and Bill Buckleys TZ750 based V8 speedway car. The night he went down to watch it at Western Springs it broke three rods during the course of the evening , the rods wrapped up around the bigend pins and the engine kept going. Three broken rods didn't slow it down much apparently.

It was made from four RD350 cases with the gearbox's cut off, the cases were held in a V formation by big end plates and the four engines drove a common center shaft. The four engines were topped with TZ750 cylinders heads and carbs. The motor may still be hanging around Haldanes some place.

**Buckets4Me** · 27th June 2011, 22:02

Originally Posted by bucketracer

That reminds me of a story Dad tells of Bob Haldane and Bill Buckleys TZ750 based V8 speedway car. The night he went down to watch it at Western Springs it broke three rods during the course of the evening , the rods wrapped up around the bigend pins and the engine kept going. Three broken rods didn't slow it down much apparently.

I remember that night (I think )
was nearly hit buy a tyre comeing over the wire fence

and my ears hurt so bad (dam loud back in those days)
and the poor side car guys (still scares me today watching side cars going around on dirt with niothing but a concreat wall to stop them after they crash,fall off or just stuff up)

**wobbly** · 28th June 2011, 09:28

Bill & Bobs V8 had a combination of cylinder sizes to get under the cc limit, was a hell of a thing to see and hear.
It ended up with 8 pumper carbs of a jetski to simplify the tuning.
The 1100 tripple is in my CAD machine 1/2 finished,and I have one prototype cylinder on my bench.
The crank is being built, and I cant go any further till I get that.
The biggest issue was getting all new parts made, as the pipe issue dictated the basic dimensions of the engine, as a short stroke was needed to enable it to rev, thus shortening the pipe length.
But, short strokes limit the available angle/area and thus the power achievable, but its no good having a heap of power if you cant fit the pipes in - even into a ZX10 chassis.
One wanker seriously suggested I turn the cylinders around, and lengthen the swingarm.
I asked what sort of handling would result from adding 400 mm to the wheelbase.
Pic shows cylinder with 54mm Honda Akit piston for size ref.

**F5 Dave** · 28th June 2011, 09:33

Yeah that looks like it would fit. Sideways.

Would have been a better pic with it in the bore, like a mouse crawling out of a hole.

**wobbly** · 28th June 2011, 10:58

It does fit, sideways

**F5 Dave** · 28th June 2011, 12:27

thats fkn hilarious!

**richban** · 28th June 2011, 15:55

Just putting it out there. If you managed to fuse 2 50cc engines together would there be any major benifit over a single hundie? Say in a V config or would parallel be better. Maybe starting with an Apriila RS50 engine or the like. Would more toque be the result rather than HP. Also how come no one puts a 24mm carb on an Aprilia rs125 and races it. Is it not allowed or somthing? Please help O wise 2 stroke men.

I will also dig up a photo of my first bucket soon. I used to ride it to school back in Tauranga The mighty single seat 50e. Also remember Kev almost buying a Zunndapp 50 back in the day. It was very cool. Been watching 50cc GP racing on youtube. Just amazing how fast they went.

http://www.elsberg-tuning.dk/bultaco.html

**richban** · 28th June 2011, 15:59

Ok shows what I know.The 50 is a V twin already. Now can you make it a hundred?

Click image for larger version.

Name: Aprilia-RS50-Engine-inspirated-from-GP.jpg
Views: 89
Size: 17.5 KB
ID: 241514

**Kickaha** · 28th June 2011, 15:59

Originally Posted by richban

Also how come no one puts a 24mm carb on an Aprilia rs125 and races it. Is it not allowed or somthing? Please help O wise 2 stroke men.

Watercooled stinky 2 strokes are restricted to 100cc

**kel** · 28th June 2011, 16:07

Originally Posted by richban

Ok shows what I know.The 50 is a V twin already.

Mate have you been sucking on that diesels exhaust pipe? Thats the Aprilia RS250 AKA RGV250.
But yes there are clear advantages in running twins over singles, the problem is finding a suitable platform plus having access to a bank manager willing to finance the build.
Now go and answer my post on aftermarket CDI for the FXR!

**F5 Dave** · 28th June 2011, 16:08

yeah read the rules Rich (here we go again. . .)
re the twin;
Trust me I've put a couple of RG50 cases together & considered the union.

Crazyman has a twin GT125 with two watercooled MB50 top ends from the late 80s/early 90s. Was pretty quick too, but fragile & 5 speed box & not a small engine.