ESE's works engine tuner

[TZ350]

But because I changed two things at once I cant say for sure which contributes the most. I will experiment with just radiusing the sharp edges in another carb later to see.

Tried smoothing the sharp edges ( I tried this twice with two different carbs) and measuring the difference to the flow through the carb. There was a definite and measurable difference of about 8-10%, not as good as I hoped but worth having.

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[TZ350]

A collection of links from the last ten pages more links are on page 80

Expansion Chamber Design According to Blair:-
http://members.bellatlantic.net/~vze...es/expcham.htm

Another interesting pipe design program:- http://www.mh-aerotools.de/airfoils/javapipe_en.htm

One of the things I like about the software from porting-programs.com 2 Stroke porting software for the enthusiast http://www.porting-programs.com/ is that it makes it very easy to get the true total and mean port areas of the transfers.

This http://www.geocities.com/a57ngel/moto/CDI.html talks about repairing/modifying a KDX CDI's retard curve, there is also a schematic.

We see that the flow bends upwards and forward towards the exhaust port as the cycle proceeds and the piston rises to shut the port. Abstract taken from http://www.lortim.demon.co.uk/vsih/pistons.htm

Hot Rods web page, Search by application, part type, dimensions or model to find the parts you need.
Put in the rods center to center distance and find the rod you need for your bucket. Great heavy duty rods for 4-strokes too.
http://www.hotrodsproducts.com/index...roducts.search
70's-80's car motorcycle hot up book.

http://www.bgideas.demon.co.uk/tmanual/

Chapter-1 about power and how its measured
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch1.pdf

Chapter-2 An interesting read about carb sizes, max port flow and shape 2 and 4 stroke.
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch2.pdf

Chapter-3 combustion and the power stroke
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch3.pdf

Chapter-4 the exhaust system and expansion chamber
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch4.pdf

Chapter-5 the camshaft
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch5.pdf

Chapter-6 Ignition
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch6.pdf

Chapter-7 Supercharger or Turbo
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch7.pdf

Chapter-8 Pistons and Rods and balancing
http://www.bgideas.demon.co.uk/tmanual/Tm_Ch8.pdf

Save the stuffing around and go buy one of these digital, programmable ignitions
http://www.ignitech.cz/english/aindex.htm

The best bell mouths are those that are short and fat!
http://www.profblairandassociates.co...mouth_Sept.pdf

4-Stroke valve spring design
http://www.profblairandassociates.co...T036_Blair.pdf

Pneumatic vs Steel valve Springs
http://www.profblairandassociates.co...ngs_Vs_Gas.pdf

Acceleration testing of a 2-Stroke
http://www.2stroke-tuning.nl/media/a...dyno_blair.pdf

Tuning a cart engine exhaust
http://www.bkarting.com/tech-docs/expchmbr.pdf

Advanced 2-Stroke tuned exhaust design
http://www.freewebs.com/jsu_tiedosto...003exhaust.pdf

Intake bell mouth design
http://www.profblairandassociates.co...mouth_Sept.pdf

Designing a race 4-Stroke
http://epubl.ltu.se/1402-1617/2006/0...X-06099-SE.pdf

Small 2-Stroke direct injection retro fit.
http://www.envirofit.org/media_docs/...or%20Small.pdf

A look at the books ava for designing and testing engines
http://store.sae.org/catalog/powertrain.pdf

A whole bunch of articles from Gordon Blair in Race Engine Design mostly 4-Stroke, so more for the FXR boys.
http://www.profblairandassociates.com/RET_Articles.html

Another from G Blair on 2-stroke direct injection. http://www.etsmtl.ca/zone2/clubs/qui...paper_2009.pdf

Anyone can open a free account with Scribed where they can download "Tuning for Speed" by Phill Irving. http://www.scribd.com/doc/15392252/T...rcycle-Engines

An explanation of the expansion chamber design process proposed by Gordon Blair.
http://members.bellatlantic.net/~vze...es/expcham.htm

A very through treatment of 4-stroke engine design fundamentals by Gordon Blair. http://www.profblairandassociates.co..._to_basics.pdf

I was particularly impressed by how they measured port angles.
www.kartweb.com/TechArt/2Stroke/chapter2.doc

Haven't found Bell yet but came across this on ignitions. yes its cars and 4-stroke but informative nevertheless.
http://www.max-boost.co.uk/max-boost...ion_deeper.htm

We have been having some success with developing a data logging system for our buckets. We use a new to the market Track Day system http://www.xtracing.com/en/gpxpro/features.php and have made a small instrumentation interface so we can log CHT and EGT temperatures.

Now that we are getting into carb setup and tuning this might be helpful.
Carb Tuning by Eric Gorr:- http://www.cyclewerksracing.com/Carb%20Tuuning.htm

Port/Time/Area Jennings page 81-82 http://www.vintagesleds.com/library/...20Handbook.pdf

Pipe dimensions Suzuki RM125 B/C page 82 Bell. http://www.kreidler.nl/artikelen/per...raham-bell.pdf

Lots of interesting Vid Clips of DIOSpeedDemon porting and developing his motor the Gordon Blair way.
http://www.youtube.com/user/DIOSpeedDemon


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[k14]

Tried smoothing the sharp edges ( I tried this twice with two different carbs) and measuring the difference to the flow through the carb. There was a definite and measurable difference of about 8-10%, not as good as I hoped but worth having.

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I would have thought 8-10% is a huge amount considering the relatively small changes you made to the carb. Good work. Interesting seeing the experimentation you are doing!

[TZ350]

I would have thought 8-10% is a huge amount considering the relatively small changes you made to the carb. Good work. Interesting seeing the experimentation you are doing!

8-10% reduction in vacuum, does that mean 8-10% increase in mass flow? just not sure what it means. For mass flow I would have to measure it the way Sonic-V suggests, or experiment on a dyno, but its a very interesting result for such a little change.

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[bucketracer]

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Register and download for free Motorcycle repair manuals. http://www.repairmanualclub.com/motomanuals/index.php

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[bucketracer]

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Malaysian motorcycle drag racing:- http://www.youtube.com/watch?v=J2lK-...eature=related

See these boys launch:- http://www.youtube.com/watch?v=yuMX_5mSTwE&NR=1

Some of them, like Thomas must know a thing or two about 2-stroke engine tuning.

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[diesel pig]

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Malaysian motorcycle drag racing:- http://www.youtube.com/watch?v=J2lK-...eature=related

See these boys launch:- http://www.youtube.com/watch?v=yuMX_5mSTwE&NR=1

Some of them, like Thomas must know a thing or two about 2-stroke engine tuning.

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I sense the Bucket force is strong in these ones

[bucketracer]

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Der geht doch ziemlich mager oder? http://www.youtube.com/watch?v=jkLfJ...eature=related

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[bucketracer]

If you could start this quick with your bucket:- http://www.youtube.com/watch?v=yuMX_5mSTwE&NR=1

[TZ350]

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Rebored the cylinder and chamfered the ports before gluing up the transfer porting mistakes, actually over cutting the transfers and then gluing them back up turns out to be a real easy way to get a smooth symmetrical port. I had mistakenly cut the ports so they opened 110deg ATDC when I really wanted 116.

Now I have a really good experimental barrel. So I degreed up the motor again at 116 ATDC and measured how far down the cylinder the piston was and cut a piece of plastic pipe that length. Covered it in plastic wrap and inserted it into the cylinder. Now the glued transfer ports will all be exactly the same height, timing and match each other.

I warmed the cylinder with a heat gun and when the Devcon F glue was put in the warm transfer port it ran freely like water and leveled out very nicely. By gluing a port in three stages I could get a very nice curve to the transfer roof. I made the rear ports flat and the main ports angle up at 29degrees.

The great thing about this gluing thing is that its so easy to change. When I finally get the scavenge pattern that I want I will be able to make a permanent copy with a new cylinder.

Pic-1 setting the angle of the port
Pic-2 warming the cylinder
Pic-3 gluing the port, doing this in three stages makes for a nice curved port roof
Pic-4 glued ports and the plastic former

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[SS90]

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Der geht doch ziemlich mager oder?
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Ja, sicher, aber was ist die Relevanz?
Sie brauchen Hilfe bei der Übersetzung?

[SS90]

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Now I have a really good experimental barrel. So I degreed up the motor again at 116 ATDC and measured how far down the cylinder the piston was and cut a piece of plastic pipe that length. Covered it in plastic wrap and inserted it into the cylinder. Now the glued transfer ports will all be exactly the same height, timing and match each other.

I warmed the cylinder with a heat gun and when the Devcon F glue was put in the warm transfer port it ran freely like water and leveled out very nicely. By gluing a port in three stages I could get a very nice curve to the transfer roof. I made the rear ports flat and the main ports angle up at 29degrees.

The great thing about this gluing thing is that its so easy to change. When I finally get the scavenge pattern that I want I will be able to make a permanent copy with a new cylinder.


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I like the idea of the plastic pipe Teezee, will save quite some time when it comes to finishing up, I recon I will give that concept a shot myself this week.

[bucketracer]

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Racing last Sunday at Mt Wellington http://www.flickr.com/photos/dty1/se...7622415977724/

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[Buckets4Me]

number 0 now under scrutiny

how much nylon has he got ????

dose he need more ???

[TZ350]

I like the idea of the plastic pipe Teezee, will save quite some time when it comes to finishing up, I recon I will give that concept a shot myself this week.

Glad you like it, finishing up was easy.

Because of the 24mm carb restriction I am building new cases and a plugged crank with a shorter rod, to "up" the primary compression ratio like you suggested.

Looking at using a RGV250 rod kit which is 5mm shorter than what I had. With the shiny transfers and the higher primary compression ratio, it should go like stink now.

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