Victoria! Zeke's CB175 Build

[Texasstar]

Compression!

we milled off .048" off the bottom of the cylinder. We have a .016" and .021" base gasket ordered and a .032" head gasket. We should be -.008" with the .021 and -.003 with the .016" to zero deck. Piston to head clearance of .035-.040". We had to remove .035" just to get to zero deck with the tbolt pistons.


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[Texasstar]

we milled off .048" off the bottom of the cylinder. We have a .016" and .021" base gasket ordered and a .032" head gasket. We should be -.008" with the .021 and -.003 with the .016" to zero deck. Piston to head clearance of .035-.040". We had to remove .035" just to get to zero deck with the tbolt pistons.


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the cb175 combustion chamber is 19.87cc. This is where we need to get to have a 15cc combustion chamber.

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[Texasstar]

Calculations for decking the cb 175 head. 52 * 52 *.007854 * 2 = 4.24 cc we need to mill off at least .0787" for a total of .1267" or 3.218mm



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[Sonreir]

That's a lot of metal to be removing. Have you considered adding metal to the interior of the chamber, instead?

 

[Sonreir]

Also, don't forget that you'll almost definitely need to degree the cam when you shorten the stack by that much.

 

[Texasstar]

That's a lot of metal to be removing. Have you considered adding metal to the interior of the chamber, instead?

yes we are planning on making a patria bathtub. I visited with someone who removed .125" total. I have been told not to go more than that. We don't have much meat in the top of the pistons to cut valve relief. Lani has a cu gasket that will go .125" and we have a new 200 stock gasket that will work. Our machinist is getting us a measurement to the intake valve seat.


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[Texasstar]

Also, don't forget that you'll almost definitely need to degree the cam when you shorten the stack by that much.

we have a 2 bolt kawasaki 30 tooth adjustable cam sprocket coming from ape. We are going to use Lucky's megacycle cam.


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[Texasstar]

We don't have to do any of this for the show but we do have to do it for ourselves.


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[Texasstar]

And we are feeling inspired coming off this road trip


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[ABCanuck]

Little inspiration on the dustbin front

 

[Texasstar]

Little inspiration on the dustbin front

beautiful

 

[Texasstar]

We want to thank Tim for supplying us with a 19" rim.

it will help is get to the ton


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[Texasstar]

Because of Tim's offer for Buchanan spokes. Mr. Buchanan offered Zeke a sponsorship. Thanks Tim and Buchanan spokes.


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[lsrcb175]

What is a "patria bathtub"?

 

[Texasstar]

What is a "patria bathtub"?

it should say partial bathtub we are going to weld up the combustion chamber opposite the spark plug.


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[Texasstar]

Zeke has finished one side of his tank and only had 3 pin holes. He is learning the difference between an oxidizing flame (too much oxygen that produces oxides) or what he calls a boiling puddle http://youtu.be/PuYle3CMW2E


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[Maritime]

Nice work Zeke, You will be so far ahead of the curve by the time you hit your 20's you should be able to land a job with almost any fab shop, race team, whatever you want to do.

 

[irk miller]

Zeke has finished one side of his tank and only had 3 pin holes. He is learning the difference between an oxidizing flame (too much oxygen that produces oxides)

Might want to consider also teaching that high temp oxidation of metals is a form of corrosion. The metal is losing one or more electrons. The powder it produces is a non-protective scale that gives access to more free oxygen which can contribute to further corrosion later on. With some alloys, the diffusion of oxygen occurs below the surface from the inside out. I know that's a lot of blah blah, but just a thought on what it all is.

 

[Texasstar]

Might want to consider also teaching that high temp oxidation of metals is a form of corrosion. The metal is losing one or more electrons. The powder it produces is a non-protective scale that gives access to more free oxygen which can contribute to further corrosion later on. With some alloys, the diffusion of oxygen occurs below the surface from the inside out. I know that's a lot of blah blah, but just a thought on what it all is.

interesting...now that makes sense so is a carburizing flame actually acting as a corrosive in order to break down stainless to be welded?


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[irk miller]

interesting...now that makes sense so is a carburizing flame actually acting as a corrosive in order to break down stainless to be welded?

As I understand carburizing, it is a reduction flame which adds carbon to the metal and hardens it. With stainless, they use plasma carburizing which has better penetration and fills the gaps.