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Author Topic: Texas Two Step Taco  (Read 7842 times)

Offline Texasstar

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Re: Texas Two Step Taco
« Reply #230 on: Nov 19, 2018, 08:35:08 »
Strings


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It's an optimization exercise and not a maximization trip.-Teazer


And though she be but little, she is fierce - WS
http://zoomwithzeke.com/
Third Times a Charm cb175
http://www.dotheton.com/forum/index.php?topic=66169.0

Honda Cb175 Victoria!

www.dotheton.com/forum/index.php?topic=52299.0

Honda Cb200 Lucky!
http://www.dotheton.com/forum/index.php?topic=45872.0

Bultaco El Montadero 360

http://www.dotheton.com/forum/index.php?topic=64349.0

Offline Texasstar

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Texas Two Step Taco
« Reply #231 on: Nov 19, 2018, 10:41:10 »
Zeke has been walking around taunting me with the L sign on his forehead but I learned a lot racing the Bultaco.  Fuel changes made a huge difference. Going 93 octane to 108 c12 causes the bike to start in reverse and kicks the crap out of your leg.  So the first thing I am working on is making a reductor for the Zeeltronic BB gave us...we will have to add a few coils and waste some spark but we will then be able to see what the bike wants instead of guessing.
I plan on mounting the reductor on the back of the flywheel shaft.

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« Last Edit: Nov 19, 2018, 11:25:55 by Texasstar »
It's an optimization exercise and not a maximization trip.-Teazer


And though she be but little, she is fierce - WS
http://zoomwithzeke.com/
Third Times a Charm cb175
http://www.dotheton.com/forum/index.php?topic=66169.0

Honda Cb175 Victoria!

www.dotheton.com/forum/index.php?topic=52299.0

Honda Cb200 Lucky!
http://www.dotheton.com/forum/index.php?topic=45872.0

Bultaco El Montadero 360

http://www.dotheton.com/forum/index.php?topic=64349.0

Online teazer

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Re: Texas Two Step Taco
« Reply #232 on: Nov 19, 2018, 11:13:19 »
Zeel should make things a lot easier for sure. That's the DC CDI unit.  Very nice.

Online Brodie

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Re: Texas Two Step Taco
« Reply #233 on: Nov 20, 2018, 12:54:51 »
Bike of the month nomination for this mate. Keep up the good work.
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Texasstar

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Re: Texas Two Step Taco
« Reply #234 on: Nov 20, 2018, 12:55:33 »
Bike of the month nomination for this mate. Keep up the good work.
Thanks Brodie


Sent from my iPhone using Tapatalk
It's an optimization exercise and not a maximization trip.-Teazer


And though she be but little, she is fierce - WS
http://zoomwithzeke.com/
Third Times a Charm cb175
http://www.dotheton.com/forum/index.php?topic=66169.0

Honda Cb175 Victoria!

www.dotheton.com/forum/index.php?topic=52299.0

Honda Cb200 Lucky!
http://www.dotheton.com/forum/index.php?topic=45872.0

Bultaco El Montadero 360

http://www.dotheton.com/forum/index.php?topic=64349.0

Offline Texasstar

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Texas Two Step Taco
« Reply #235 on: Nov 20, 2018, 13:10:40 »
This is why you want a programmable ignition for a two stroke. This is the Zeeltronic and Skip to 1:10 to start and watch the ignition degrees as the Aprilia RS250 revs. 




Sent from my iPhone using Tapatalk
It's an optimization exercise and not a maximization trip.-Teazer


And though she be but little, she is fierce - WS
http://zoomwithzeke.com/
Third Times a Charm cb175
http://www.dotheton.com/forum/index.php?topic=66169.0

Honda Cb175 Victoria!

www.dotheton.com/forum/index.php?topic=52299.0

Honda Cb200 Lucky!
http://www.dotheton.com/forum/index.php?topic=45872.0

Bultaco El Montadero 360

http://www.dotheton.com/forum/index.php?topic=64349.0

Online teazer

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Re: Texas Two Step Taco
« Reply #236 on: Nov 20, 2018, 14:08:37 »
If we had engines that revved to 12k with powervalves etc which made around 240hp/liter, we'd all need programmable ignitions. Unfortunately, our old clunkers are not so responsive to ignition timing - except when it's too advanced on the day that air is dense and we are jetted lean......

The higher teh state of tune, the more that we need to get timing spot on to get the most out of a motor.  At low revs with zero to negative pipe effects, we can light the fire much earlier.  On the pipe at higher revs compression and temperature are higher and we need less advance to get peak pressure at the right time (14-16 ATDC). 

What's really nice with programmable ignition on our old bikes is that you can set timing quite late at startup to reduce the chance of kickback and reverse running.  On a low state of tune drag bike that only runs at wide open throttle and in the powerband, there's probably not as much need for a complex ignition curve, but it all helps. 

Sleds are interesting.  Some Polaris 2 strokes had peak advance as low as 3000 and retarded slowly from there.  Others don't reach peak advance until 6000 (19 degrees) and drops off to around 11 degrees at 8,000.  What Sled guys spend a lot of time on is setting up the clutching to get the most out of what power it makes.

I see lots of dyno time in your future.

 

Offline Texasstar

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Re: Texas Two Step Taco
« Reply #237 on: Nov 20, 2018, 16:29:08 »
If we had engines that revved to 12k with powervalves etc which made around 240hp/liter, we'd all need programmable ignitions. Unfortunately, our old clunkers are not so responsive to ignition timing - except when it's too advanced on the day that air is dense and we are jetted lean......

The higher teh state of tune, the more that we need to get timing spot on to get the most out of a motor.  At low revs with zero to negative pipe effects, we can light the fire much earlier.  On the pipe at higher revs compression and temperature are higher and we need less advance to get peak pressure at the right time (14-16 ATDC). 

What's really nice with programmable ignition on our old bikes is that you can set timing quite late at startup to reduce the chance of kickback and reverse running.  On a low state of tune drag bike that only runs at wide open throttle and in the powerband, there's probably not as much need for a complex ignition curve, but it all helps. 

Sleds are interesting.  Some Polaris 2 strokes had peak advance as low as 3000 and retarded slowly from there.  Others don't reach peak advance until 6000 (19 degrees) and drops off to around 11 degrees at 8,000.  What Sled guys spend a lot of time on is setting up the clutching to get the most out of what power it makes.

I see lots of dyno time in your future.
There is always nitrous....;)


Sent from my iPhone using Tapatalk
It's an optimization exercise and not a maximization trip.-Teazer


And though she be but little, she is fierce - WS
http://zoomwithzeke.com/
Third Times a Charm cb175
http://www.dotheton.com/forum/index.php?topic=66169.0

Honda Cb175 Victoria!

www.dotheton.com/forum/index.php?topic=52299.0

Honda Cb200 Lucky!
http://www.dotheton.com/forum/index.php?topic=45872.0

Bultaco El Montadero 360

http://www.dotheton.com/forum/index.php?topic=64349.0

Online teazer

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Re: Texas Two Step Taco
« Reply #238 on: Nov 21, 2018, 11:52:04 »
Now you're talking.....  :-)