Father Son 75 CB200T Rise From the Ruins

[Texasstar]

Teazer it was 60° yesterday and this weekend we have 2-60 days so you're always welcome in Texas


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[teazer]

As I hear all the time..

That's what I'm talkin' 'bout bro.

Low crown, low head, high rings, shorter lighter pistons - did I mention that we shorten and lighten our pistons and treat them to a hair cut - take a lot off the sides. ;-)

 

[Sonreir]

Everyone loves a short skirt.

 

[Texasstar]

Everyone loves a short skirt.

^^^^^^^^^*^^^^^


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[Texasstar]

^^^^^^^^^*^^^^^


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Teazer has both top-down and bottom-up process thinking skills


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[Texasstar]

Wow. Love this build!

welcome aboard!


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[simo]

Since the 175 had 8mm less barrel hight but the same 41mm stroke
The 200's added 8mm to the crown
so would it be feasible to shave
the whole 8mm
off the barrels to use a lower crowned piston
Or is 8mm too much?

 

[teazer]

Different pin diameter, different rod length, different piston height and barrel height. But Cb77 305 pistons would fit I think.....

 

[Texasstar]

The cb200 rod is app 104mm and the stroke is 41mm and the rod ratio is 2.5:1?????
The cb175 rod is app 90 mm and has the same stroke so the ratio is 2.2:1??? Remind me to carry a cb200 Conrod on my keychain...I didn't get a great measurement on the cb175 Conrod because it was in its case. Maybe someone has a more accurate measurement?

 

[simo]

Different pin diameter, different rod length, different piston height and barrel height. But Cb77 305 pistons would fit I think.....

Yeah I wasn't thinking about swapping the 175 crank with the 200 more
If the rods only move vertically 41mm so the pivot is 20.5 mm from the center of the crank on both so the hight difference between the 175 and 200 barrel is in the combined lenght of rod and crown, if the piston and rod are acting like a pendulum with two fulcrum ( which also moves vertically ) I can see how lowering the crown hight and lenghtening the rod would affect the transmission of power through the top of the piston into downward force . My question was more about the max hight that could be shaved off the top of the cylinders and still be viable, and use a low crown ,high domed piston with a 15mm pin? To keep the compression numbers up
http://www.akunar.com/PRO_PISTONS.htm

 

[Texasstar]

So did I calculate the rod ratio correctly? I went from center to center on the rod and divided it by the stroke.


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[teazer]

CB175/160 rod is 97mm ctr to ctr so that's 97/41 = 2.37:1 Cars are in the 1.5 - 2.0 range as a rough rule of thumb

 

[Texasstar]

So what would be the rod ratio averages for motorcycles and when do you see diminishing returns on length?


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[iGreek]

This is a cool build. I like it man.

 

[behrboy]

http://youtu.be/jFAB5qVDT-8
Not sure if you found this. Your cb200 is pictured and sound clip @ 6:15. Small world

Funny vid.

 

[Texasstar]

Our first day with our new cobra torch http://youtu.be/2WKw2gYqySY we made a bunch of mistakes but didn't burn the house down.


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[john83]

Very cool.

 

[Texasstar]

Color sanding is one of my favorite detail things to do and it seems counter intuitive to scratch something up to make it shiny. But my dad showed me how to do it 2000 grit wet sand and the polish with a DA. We got our family crest decals in...we are trying to decide between the 4" and 6"

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[teazer]

Hint: Smaller is usually better. It's more subtle and refined. ;-)

 

[Sonreir]

4" is my vote, too.