Texas Two Step Taco

pidjones

Well-Known Member
Looks like the fins can go thinner, or be tapered to remove a bit more without cutting heat transfer.
 

Texasstar

Can't is a four letter dirty word
pidjones said:
Looks like the fins can go thinner, or be tapered to remove a bit more without cutting heat transfer.
That is exactly what Zeke told me! Thank you! They are 3mm each.


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Texasstar

Can't is a four letter dirty word
Bultaco Montadero M81 Vs the Bandido B18 port maps. https://youtu.be/IJgaDzBdbHg


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Texasstar

Can't is a four letter dirty word
Zeke and I pulled the head and cylinder this is what the Magee pipe did and revving to 8k.



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Texasstar

Can't is a four letter dirty word
We checked the squish after the fact. We had removed the base gasket and we still had .042” squish.


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Texasstar

Can't is a four letter dirty word
Sonreir said:
If you're still making power and don't mind tearing down the engine on a frequent basis, you can go even higher. Short skirt forged pistons can often get you over the 5000 ft/min mark (especially on a drag motor, which will only be running these speeds for short periods of time).

Abnormal wear on the skirts will be a signal that you're near/past your limit.

Depending on how deep you want to go down this rabbit hole, longer con rods will also help, but will also bring a new set of problems with them.
You were right...abnormal wear on your skirt...so 8500 is the limit. I think we will shoot for 8000.


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Texasstar

Can't is a four letter dirty word
Here is a Pursang 250 that somebody put an Astro jug on it. Case ports have nice carbon print to port now.
teasers idea of using a more modern jug.


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Texasstar

Can't is a four letter dirty word
Bought this yesterday for our company. Two stroke hybrid technology.
https://youtu.be/6bZ68QSpYCs

http://www.hybrid4engine.com/_docs/brochure/Hybrid4_brochure.pdf

What do you think?


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Sonreir

Oregon
DTT SUPPORTER
Texasstar said:
We checked the squish after the fact. We had removed the base gasket and we still had .042” squish.


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Opinions differ, but .040" is usually the upper limit for what one would consider a squish band. Not uncommon to see clearances as low as even .010".
 

Texasstar

Can't is a four letter dirty word
Sonreir said:
Opinions differ, but .040" is usually the upper limit for what one would consider a squish band. Not uncommon to see clearances as low as even .010".
This is going to sound crazy but we are starting with 1.4 millimeters =
0.0551 inch



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Texasstar

Can't is a four letter dirty word
Found pictures for the Model 81 cylinders with the finger ports. Were the finger ports part of the intake or transfers?



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Texasstar

Can't is a four letter dirty word
Did an overlay of the porting of the Model 18 Bandido and the model 81 montadero https://youtu.be/IJgaDzBdbHg


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Texasstar

Can't is a four letter dirty word
teazer said:
Transfers. There must be matching holes in the piston.
Thank you. Zekes M70 piston on the left and My M51 piston on the right had holes on the exhaust side. What were these for? Both our skirts had been shortened on the exhaust side also.



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teazer

Well-Known Member
DTT BOTM WINNER
Do you have a matching M51 barrel to csee what the holes line up with? If not a transfer duct then probably to cool the front face of the barrels, but they are large for that.
 
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