I love billet

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Fast Eddie said:
Jeandr said:
comnoz said:
Naa, Then I would have to comb my hair. Jim
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Count yourself lucky to have hair :lol:

Jean
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Why lucky?

Hair loss = weight saving...!
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That's about the only weight I am taking off these days! Sheesh.

Jim, It's rubbish that you would have to comb your hair. That is like thinking we know the color of Kate Upton's eyes!
 
I don't know for sure but reading the meager info on Burt's blow ups seems were more piston failure than bores of seasoned sewer pipe.
 
Jim, why not plated liners? I've made many liners from aluminum pipe and had them plated. They have all worked fine.

Lots of chips, beautiful piece, nice work.
 
motoracer8 said:
Jim, why not plated liners? I've made many liners from aluminum pipe and had them plated. They have all worked fine.

Lots of chips, beautiful piece, nice work.
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Thanks,
There is only around .275 between pistons with an 80mm bore. That does not leave enough room for a two aluminum liner walls plus a divider that would be thick enough to be strong. That is why I am using high strength liners. Jim
 
Well I made a jig and run the program on the bottom of the barrels. I found two mistakes in the program. One was an incorrect cutter radius entered which caused a chatter mark at the lower rear of the barrel. That will clean up easily. The other mistake was incorrect progression of the depth of the fins in front of the lifter bores. It may require sleeves in the lifter bores if the bore breaks through in one spot. It will be close. Jim

I love billet


I love billet
 
Would this be a bad time to mention that there is some connection between aluminium and Alzheimer's? :D

Glen
 
worntorn said:
Would this be a bad time to mention that there is some connection between aluminium and Alzheimer's? :D

Glen
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Excuse me, do I know you?
 
Slow down, Jim. Love the billet. look at it, caress it, touch it, now we dance.

I love billet
 
comnoz said:
worntorn said:
Would this be a bad time to mention that there is some connection between aluminium and Alzheimer's? :D

Glen
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Excuse me, do I know you?
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You guys crack me up... :D ...I made my wife get rid of her aluminum pots and pans about 10 years ago....now if I could just get her to stop microwaving stuff in plastic containers I might make it to 80 and still remember who I am, and be cancer free :shock:
 
cjandme said:
comnoz said:
worntorn said:
Would this be a bad time to mention that there is some connection between aluminium and Alzheimer's? :D

Glen
Click to expand...

Excuse me, do I know you?
Click to expand...

You guys crack me up... :D ...I made my wife get rid of her aluminum pots and pans about 10 years ago....now if I could just get her to stop microwaving stuff in plastic containers I might make it to 80 and still remember who I am, and be cancer free :shock:
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I don't mind aluminum pots and pans, neither do I mind microwavig stuff in any type of container, but I stay away from places like Afghanistan :wink:

Jean
 
Yeah the basic non main stream summary is the Al gets inside neurons and destroys the detox poison expelling mechanisms so other mean metals stick around and help sludge up the mind. Maybe next time test out on a block of stiff dense foam material or wood like olden days. Are the lifter bores under much stress in that area? What would Norton factory do?
 
hobot said:
. Are the lifter bores under much stress in that area? What would Norton factory do?
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Actually I lucked out. The angle was wrong but after doing some measuring I find the deepest groove cut is the one that is correct and the other grooves are not as deep as they should be. So the error ended up giving me extra wall thickness. Nice when you don't have to figure out how to machine metal back on. Jim
 
Serious question - with a purpose because I may go this route one day with a 500 barrel.

Over the years I have read and been told conflicting things about the usefulness of alloy barrels on our kind of bike.

Rolland Pike reported significant hp loss with the use of alloy barrels on works Gold Stars until they installed very thick cast iron liners.

Read half way down this page. These are actually a very interesting set of articles for the budding classic racer !!!!!


http://beezagent.blogspot.ro/2009/01/ro ... er-23.html

Dave Nourish was most unhappy about them. He personally told me he tried alloy barrels on his Nourish engines before going back to cast iron.

So has anyone done any testing to show they are a great idea. The weght saving is clear but what about engine performance?

John
 
Alloy barrels work great, 12,000 Vincent owners can't be wrong! There is much greater cooling than with cast iron. Too much heat is the enemy of horsepower and longevity.
But there has to be adequate interference between liner and muff or the heat transfer does not occur as it should.

Glen
 
johnm said:
Serious question - with a purpose because I may go this route one day with a 500 barrel.

Over the years I have read and been told conflicting things about the usefulness of alloy barrels on our kind of bike.

Rolland Pike reported significant hp loss with the use of alloy barrels on works Gold Stars until they installed very thick cast iron liners.

Read half way down this page. These are actually a very interesting set of articles for the budding classic racer !!!!!


http://beezagent.blogspot.ro/2009/01/ro ... er-23.html

Dave Nourish was most unhappy about them. He personally told me he tried alloy barrels on his Nourish engines before going back to cast iron.

So has anyone done any testing to show they are a great idea. The weght saving is clear but what about engine performance?

John
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I believe that in many cases, alloy barrels were tried out only as simple copies of the cast iron versions. Some clever engineers carefully worked out the various stresses etc in the iron barrels, but just copying them in weaker and very different alloy, is a total leap into the unknown.
I also know that quite a famous maker of aftermarket alloy big bore kits (not Norton) actually used a foundry who's core business was cast alloy playground furniture. Their knowledge of engines, and the required metallurgy was zero!
Add these things together and there is little wonder that many had problems, and then ruled alloy out as unsuitable. But as Glen writes, 12,000 Vincent owners, plus countless owners of Harley's Ducatis, etc, etc, etc cannot all be wrong.
It is clear that alloy per se, if the correct grade, and correctly designed and correctly manufactured and then correctly fitted with a correctly specified liner IS perfectly OK.
The issue, I think, is that there are too many variables for those who do not know and / or research correctly, to make many / costly errors.
I fully intend to fit alloy big bore barrels to my 850 at some stage, so am keeping an interested eye on Mr Comstock's progress here... From what I've seen so far, I'm growing impatient!!
 
johnm said:
Serious question - with a purpose because I may go this route one day with a 500 barrel.

Over the years I have read and been told conflicting things about the usefulness of alloy barrels on our kind of bike.

Rolland Pike reported significant hp loss with the use of alloy barrels on works Gold Stars until they installed very thick cast iron liners.

Read half way down this page. These are actually a very interesting set of articles for the budding classic racer !!!!!


http://beezagent.blogspot.ro/2009/01/ro ... er-23.html

Dave Nourish was most unhappy about them. He personally told me he tried alloy barrels on his Nourish engines before going back to cast iron.

So has anyone done any testing to show they are a great idea. The weght saving is clear but what about engine performance?

John
Click to expand...

My experience with Ken Canaga's alloy barrels on my racebikes was good. I found a large drop in engine temperature and a few more horses because of it.
Is it good on a streetbike? I guess I will be finding out. Jim
 
Good.

So the consensus is positive. If done correctly. I shall store the idea away for a future time and place

Regards John
 
To start with , Jims work is excellent.
Tony Maughan ,who i meet a few times machined solid muffs with greater wall thickness,the original Vincent cast muffs "let go" and oil crept between the liner and muff.
Cast iron as less hight "expansion" and the holding down bolts dont get streesed [iron and steel expand together] i assume a water cooled engins [less expansion] is kinder on alloy cylinders...and holding down bolts.
consider all the triple tightening on new head gaskets, due to expansion with commando's
Jim must love this work as his program time must be days :!:
I had a few Wellworthy Triumph 650 cylinder's which where great , cast muffs... velocettes returned back to iron in the later years.
Iron liners in alloy frett, contraction and expanding ..all that said Jim is appling his skills and showing us mortals an insight into his world ,and that we must applaud!

uote="johnm"]Serious question - with a purpose because I may go this route one day with a 500 barrel.

Over the years I have read and been told conflicting things about the usefulness of alloy barrels on our kind of bike.

Rolland Pike reported significant hp loss with the use of alloy barrels on works Gold Stars until they installed very thick cast iron liners.

Read half way down this page. These are actually a very interesting set of articles for the budding classic racer !!!!!


http://beezagent.blogspot.ro/2009/01/ro ... er-23.html

Dave Nourish was most unhappy about them. He personally told me he tried alloy barrels on his Nourish engines before going back to cast iron.

So has anyone done any testing to show they are a great idea. The weght saving is clear but what about engine performance?

John[/quote]
 
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