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Author Topic: Texas Two Step Taco  (Read 11146 times)

Offline Texasstar

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Re: Texas Two Step Taco
« Reply #240 on: Apr 07, 2019, 09:27:13 »
So with a little help of the Bultaco group on Facebook we have found out what the spring and cam are on the front of the crank.  Gear driven primaries have some form of drive to protect the transmission and that spring on the crank is a shock absorber.  It is a Cush drive. we have found out about this...


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Offline teazer

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Re: Texas Two Step Taco
« Reply #241 on: Apr 07, 2019, 12:22:35 »
Nice cylinder head.  Ralf is a smart cookie for sure.  And the torroidal combustion chamber is sweet.  14:1 is easy to start - just add more exhaust timing to drop the effective (dynamic) compression at low revs.  A strong leg would also be useful. :-)

That form of cush drive was common on older bikes.  Triumph twins used it for years as did Norton on their singles and many others. It's a spring loaded face cam and it won't disintegrate the way that cush drive rubbers do.
« Last Edit: Apr 07, 2019, 12:24:32 by teazer »

Offline Texasstar

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Texas Two Step Taco
« Reply #242 on: Apr 11, 2019, 13:44:54 »
Nice cylinder head.  Ralf is a smart cookie for sure.  And the torroidal combustion chamber is sweet.  14:1 is easy to start - just add more exhaust timing to drop the effective (dynamic) compression at low revs.  A strong leg would also be useful. :-)

That form of cush drive was common on older bikes.  Triumph twins used it for years as did Norton on their singles and many others. It's a spring loaded face cam and it won't disintegrate the way that cush drive rubbers do.
Thank you I hope we get to race together one day!  So..:speaking of the Cush life...Ralf and I have been talking about a 123 auto transmission and he said, “Ah I see. The outer clutch basket is one piece with the gear. Thats where most manufacturers put the cush / damper.
What jumps in mind..... it could be modified rather easy to an overrunning pulley if u ever want to use some 1-2 or 1-2-3 auto transmission mod for drag-race.
The overunning pulley will protect the selector forks in case u have to close throttle for some reason.... Usually stock gears and the shift drum get modified for auto tranny. Dogs on gears get a ramp and shiftdrum little slot mods.
Suggest start with stock tranny and lets see where u get.”  A little more involved than a lock out...but how will we get to that .002 R/T ?


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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
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Honda Cb175 Victoria!

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

Honda Cb200 Lucky!
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Bultaco El Montadero 360

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Offline Texasstar

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Texas Two Step Taco
« Reply #243 on: Apr 12, 2019, 19:07:56 »
185 degrees exhaust duration for the Bultaco Montadero M51


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« Last Edit: Apr 12, 2019, 19:57:35 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

Offline Texasstar

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Re: Texas Two Step Taco
« Reply #244 on: Apr 15, 2019, 12:20:15 »
Dyno for grins straight header no muffler 5k rpms...raining outside humidity was high!


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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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Re: Texas Two Step Taco
« Reply #245 on: Apr 15, 2019, 12:29:45 »
That no pipe run was in first gear and it revealed this issue. 47mph in first gear.


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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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Re: Texas Two Step Taco
« Reply #246 on: Apr 15, 2019, 12:42:31 »
This is the dyno run. High humidity aftermarket 70’s expansion chamber 80 plus MPH in second gear.


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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Re: Texas Two Step Taco
« Reply #247 on: Apr 15, 2019, 12:45:20 »
we were getting huge RFI interference but the RPMs on the monitor matches my gauge on the bike. After this run the Bultaco wouldn’t start so we did a compression test and had 60 psi.


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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Re: Texas Two Step Taco
« Reply #248 on: Apr 15, 2019, 12:50:27 »
We rebuilt the taco while we tried to remove some heads for a H2 he just bought.  Geeze now I know why H2 heads are so expensive. we measured the bore 85.35 mm the pistons were .50 over stock which made them 85.50.  We had some marks where Zeke had seized the bike before.


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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Re: Texas Two Step Taco
« Reply #249 on: Apr 15, 2019, 13:26:26 »
Inside the M51 Bultaco


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