ESE's works engine tuner

[breezy]

can anybody help me with this question?. if there was a increase in atmospheric pressure what impact would it have on a 2 stroke engine? would it be a positive impact or a negative one?

[TZ350]

How to make a decent light weight racing 12 Volt generator stator for the Suzuki GP/TF/TS RG50 from a Lifan after market magneto kit. We have spun these to 14,000 rpm plus on the dyno and they have proved reliable on the track.

The Lifan back plate and modified flywheel fits perfectly into the Suzuki GP/TF/TS and RG50 cases.



Basically the conversion involves transferring the center from a Suzuki flywheel to the Lifan.

...

Chambers starts by spinning the heads of the rivets off of the Suzuki flywheel. He then punches out the rivets of the Suzuki fly wheel to free the Suzuki's center boss.

He then bores the Lifan boss out to suit the Suzuki boss, a close fit is required here, basically size for size, with minimal clearance. And then he spins the heads of the rivets off the Lifan flywheel.

The next move is to orientate the Suzuki boss and Lifan flywheel so that there is an appropriate gap between the heal of the trigger tooth and trigger coil at TDC, usually 20 deg.

...

The last move is to secure the Suzuki boss to the remains of the original Lifan boss left inside the Lifan flywheel. Chambers drills and taps through the Lifan flywheel and the remains of the original Lifan hub and rivet's. If a rivet turns, he gives it a little touch with the TIG, just a small tack weld is all that is needed to hold a loose rivet while it is drilled and tapped.

We cut the two Lifan high Voltage winding's off and re wind the three empty stater polls for extra 12 Volt current capacity. Although you can get away with using just the three original 12 Volt coils for powering an Ignitec but if you want a water pump too then you need to rewind the empty three polls.

Use a Lifan voltage rectifier/regulator and a 36V 2200uF capacitor for powering an Ignitec CDI ignition. If you do try winding on extra coils remember they are wound in alternating directions, ie; the first clockwise the second anti clockwise, the clockwise again and so on around the stater.

We use the Lifan stater assembly to power our Ignitec ignitions. We have not tried it but you may get away with using the complete Lifan racing ignition package and CDI. The Lifan CDI is probably better for engines that don't rev much past 10k or so.

[Frits Overmars]

if there was a increase in atmospheric pressure what impact would it have on a 2 stroke engine? would it be a positive impact or a negative one?

When in doubt, exaggerate, Breezy. And if that doesn't help, reverse the situation. What impact would zero atmospheric pressure have on a two-stroke engine?

[husaberg]

can anybody help me with this question?. if there was a increase in atmospheric pressure what impact would it have on a 2 stroke engine? would it be a positive impact or a negative one?

When in doubt, exaggerate, Breezy. And if that doesn't help, reverse the situation. What impact would zero atmospheric pressure have on a two-stroke engine?

I haven't actually read it but i am sure its rad.
http://www.intercompracing.com/docum...ir_Density.pdf

When the air temperature drops the engine will run leaner and more fuel will have to be added to compensate.
Altitude affects jetting since there are less air molecules as altitude increases. A bike that runs good at sea level will run rich at 10,000 ft due to the thinner air.
As humidity increases, jetting will become richer. http://www.iwt.com.au/mikunicarb.htm

[F5 Dave]

Hey good timing Rob, a mate just bought that TF in the NSR frame from Auckers and I'm inevitably going to get pulled into it and finding CR setups is expensive and getting harder. Maybe Ican get him to ssubcontract the ign out so I don't have to do more than set it up. Then he just needs to find some money for an ignitech.

[jasonu]

RGV sleeved has been a bit variable. Nigel's bike for sure has been successful but largely because of the useless old old fat fart (a mate) riding it. Its fast but my MB has past it. He needs to increase peak power past 12000 rpm.(pussy) .but hes too ghey. Diesels bike has never been close. But one ride of it at Ruapuna motivated me to get my RS MB going again.

Skinny kid not afraid of braking more bones could have won the battle of the buckets once I'd sorted it, easy. Useless fat old prick winning the sprint races showed that if it could keep together itcould (pin fixed that).

I heard No mates (nigel) bike seized every time he tried to ride it on any track bigger than a kart track.

[diesel pig]

Diesels bike has never been close. But one ride of it at Ruapuna motivated me to get my RS MB going again.

version you rode a couple or three years ago may not have been close with sub-optimal pipe and crack in the cylinder head but by doing all the welding the head needed in one go with very careful heating and cooling we got around the cracking problem in the cylinder head. Using Frits's formula for pipe design and a beautifully made but cheap Tyga pipe as a base we have got a pipe alot closer to optimal. It now go's past Tuned FXR150's down the front of straight ruapuna and back straight at levels like they are stuck in fifth gear.

[mr bucketracer]

I heard No mates (nigel) bike seized every time he tried to ride it on any track bigger than a kart track.

Don't Mention the War!, i think i got away with it last time

[mr bucketracer]

version you rode a couple or three years ago may not have been close with sub-optimal pipe and crack in the cylinder head but by doing all the welding the head needed in one go with very careful heating and cooling we got around the cracking problem in the cylinder head. Using Frits's formula for pipe design and a beautifully made but cheap Tyga pipe as a base we have got a pipe alot closer to optimal. It now go's past Tuned FXR150's down the front of straight ruapuna and back straight at levels like they are stuck in fifth gear.

yes , mine jumps back to fifth gear because i'm to fat lol, good old tyga pipes work well

[husaberg]

version you rode a couple or three years ago may not have been close with sub-optimal pipe and crack in the cylinder head but by doing all the welding the head needed in one go with very careful heating and cooling we got around the cracking problem in the cylinder head. Using Frits's formula for pipe design and a beautifully made but cheap Tyga pipe as a base we have got a pipe alot closer to optimal. It now go's past Tuned FXR150's down the front of straight ruapuna and back straight at levels like they are stuck in fifth gear.

It sure is pretty though.

[breezy]

When in doubt, exaggerate, Breezy. And if that doesn't help, reverse the situation. What impact would zero atmospheric pressure have on a two-stroke engine?

oh right, thanks. well no atmospheric pressure i assume would be no air flow? therefore no airflow into the engine would be a negative impact. i would then suppose that if the engines airflow was subjected to/lived in a higher than our average 14.96 psi atmosphere then this would be increased airflow in and a positive impact? like turbo charging, maybe?

please put me right, if i am wrong

Frits, if a 2 stroke engine was mechanically run, completely sealed off, with only air trapped inside when sealed up , would there be an increase in air pressure trapped within ?

[breezy]

I haven't actually read it but i am sure its rad.
http://www.intercompracing.com/docum...ir_Density.pdf

husaberg, so is air pressure the same as atmospheric pressure?

[husaberg]

husaberg, so is air pressure the same as atmospheric pressure?

Atmospheric pressure varies, that why they invented barometers, The atmosphere is made of air.
I just assumed that was what you are asking about, It seems what you are actually asking about is Pressure above relative amospheric pressure.

[breezy]

Atmospheric pressure varies, that why they invented barometers, The atmosphere is made of air.
I just assumed that was what you are asking about, It seems what you are actually asking about is Pressure above relative amospheric pressure.

Yes, sorry my fault

[lohring]

Increased atmospheric pressure helps in my experience. I race 26 cc gasoline engine powered model boats as well as smaller boats with nitro fueled engines. Our straight line speed trial boats always ran 2 to 3 mph faster at around 100 mph in Los Angeles than at our 500 foot elevation pond. Gasoline engine boats won't pull sea level size propellers at 2500 foot elevation. Nitro fueled engines have no problem at that altitude but need to run a little leaner. At 5,000 feet even the nitro boats need to prop down and gasoline fueled boats run much smaller propellers with much leaner carb needle settings. The 100 degree summer temperatures didn't help either. We probably needed to change the tuned pipe lengths at higher altitudes, but I run fixed length pipes on gasoline engines

Lohring Miller