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#280667 - 10/24/09 2:58 pm Question about pre unit T100 alloy barrel  
Joined: Oct 2009
Posts: 226
machico Offline
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machico  Offline
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JAPAN
Hi. I am working on 1953 T100C. blush I have some question about the alloy cylinder barrel.

Does anybody know the correct fitment of the T100 alloy barrel?

I mean that the one side of the barrel is round shape but the other side is sharp and I am wondering which direction of the barrel is forward side. I have looked at the pictures on internet and books and think that the sharp side of the barrel is forward side and the round side of the barrel is back side. However my barrel fits to the crankcase in opposite direction from the pictures. There are two dowel pins at left side so the direction of my barrel should be correct but.... is it actually correct? Are there two ways to fit on the engine? or is something wrong with my alloy barrel?

Sorry for my bad English but hope you guys could understand what I want to say.......Thanks!! smile

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#280674 - 10/24/09 3:55 pm Re: Question about pre unit T100 alloy barrel [Re: machico]  
Joined: Aug 2001
Posts: 6,665
Jon W. Whitley Online content
Jon W. Whitley  Online Content



Joined: Aug 2001
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Hi macico and welcome to BritBike !

The two dowel holes are slightly larger in circumference and go on the (left) or drive side of the cases.

I looked at my alloy cylinders for fun and from the outside I wouldn't be able to tell. They are installed on the engine, so to verify I looked at a few case sets and cylinders on the bench.

I didn't check my factory workshop manuals, but it may reference this as well. Do you have those?


Cheers,
beerchug


Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#280685 - 10/24/09 4:46 pm Re: Question about pre unit T100 alloy barrel [Re: Jon W. Whitley]  
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machico Offline
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machico  Offline
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JAPAN
Hi Jon W. Thanks so much for the response! smile

Yes, I've already checked the two dowel holes of the barrel which are slightly larger and been able to fit the barrel to the crankcase. The dowel pins are at drive side on the crankcase. However it seems to me that the direction of the barrel is incorrect. confused

When you look at the alloy barrel form up side, the one side of the fines look rounded fin and the other side of the fins look sharper than the other side of fins. The pictures I have looked at told me that the sharp side is forward and rounded side is back side but mine is opposite from that. I am so confused by that. confused I wonder how everybody's barrels are.

My barrel is NOS by the way. it may be an inferior one??

I checked the parts manual and workshop manual but couldn't figure out. eek

Thanks,

macico

#280700 - 10/24/09 7:04 pm Re: Question about pre unit T100 alloy barrel [Re: machico]  
Joined: Jun 2007
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HawaiianTiger Online content
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HawaiianTiger  Online Content

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Posts: 5,450
Maui Hawaii
Macio,

Very desirable model! 1953 T1ooc. You have already met our most prolific pre unit enthusiast JW2. We have a few others as well as myself.
It is a very lucky to find a NOS cylinder for thsese bikes. The only difference in function of the cylinder barrel is the fit which you already know is controlled by the dowels. Aesthetically it might be preferable to have the fins that are more rounded to the front or rear but changing the dowel position by drilling to achieve this presents a problem for someone in the future when reassembling the engine if that should ever occur in determining which way 'round the cylinder should be installed. If you do not see that as a problem them by all means you should install the cylinder any way you want. It could be preferable to install a set of dowells on the old position though and peen them in so that they do not drop out. There could be a little movement in the cylinder if you don't and that would be undesirable .
Bill

わが校へようこそ!

The above was supposed to say, "Welcome to our school" in Kanji but it didn't work!
Bill

Last edited by HawaiianTiger; 10/24/09 7:08 pm.

Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
#280771 - 10/25/09 7:05 am Re: Question about pre unit T100 alloy barrel [Re: HawaiianTiger]  
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machico Offline
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machico  Offline
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JAPAN
Hi Bill,

Thank you so much for your response and trying to say in Kanji!! smile grin

So I don't have to worry about the direction of the cylinder if I follow the way the dowels are on my engine right?

By the way, I think all triumph cylinder besides T100 alloy one is same shape when you look at it from upside. If there are no center stud holes like 8 stud cylinder, you can't tell which way is front or rear right? The dowel position determines the direction though. Why is the shape of the T100 cylinder different from others? I wonder how the engineer at Triumph determined the design of the shape of the T100 alloy cylinder. I think there may be not only aesthetically reasons but also functional reasons in the T100 barrel shape...such as the rate of heat expansion? If so, There must be correct direction to install the barrel. Do I think too much???? blush

Thanks,
macico

#280782 - 10/25/09 12:07 pm Re: Question about pre unit T100 alloy barrel [Re: machico]  
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Posts: 863
Tasman Online content
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Tasman  Online Content
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Tasmania - Gateway to Antarcti...
Hi Macico

The rounder side of the barrel goes toward the back while the sharp end at the front. The fins on the barrel match up with those on the head.
If you are still unsure, I'll post a photo tomorrow.
A NOS alloy barrel is quite a find. Maybe one day I will be so lucky.


"Live the life you love, find a god you trust and don't take it all too seriously"

Pre-units rule!

Mid fifties Triumph T100
#280789 - 10/25/09 12:45 pm Re: Question about pre unit T100 alloy barrel [Re: Tasman]  
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Posts: 226
machico Offline
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machico  Offline
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JAPAN
Hi Tasman,

Thanks for your reply! smile So mine is NOS but something may be wrong with the dowel position...it is interesting. I don't mind if it works well though. I would like to see your barrel.Could you please post it please?

Here is the pic of my alloy barrel on the crankcase. I finally could post it. I am not sure why this barrel is installed like this way. confused



Thanks,
macico

#280813 - 10/25/09 4:56 pm Re: Question about pre unit T100 alloy barrel [Re: machico]  
Joined: Aug 2001
Posts: 6,665
Jon W. Whitley Online content
Jon W. Whitley  Online Content



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Vermont
Hi Macico,

I would install the barrels with the dowels on the drive side. Build it and run it!

On most of my iron barrel sets, the casting number is in the rear on the flange. This isn't so with the alloy barrels that I know of.

Since this is an NOS set of barrels, never run? and you are using new pistons and rings? If this is the case, it won't matter which way you install the barrel. If you take it down in the future for some reason, just rememeber to install it the way it came off.

I am inclined to believe it is correct and ready for you to install on your cases as it is right now.

Cheers,


Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#280823 - 10/25/09 6:22 pm Re: Question about pre unit T100 alloy barrel [Re: Jon W. Whitley]  
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Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
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Posts: 11,108
North Georgia, USA
Can't get this lousey site to display images, so you'll have to CLICK HERE


As you can see, very early alloy top end T100 models had the pipes coming out straight out the front, much like a Trident. In that case the larger portion faces forward.

bigt

Last edited by RF Whatley; 10/25/09 6:30 pm.

Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#280865 - 10/25/09 10:34 pm Re: Question about pre unit T100 alloy barrel [Re: RF Whatley]  
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Posts: 6,665
Jon W. Whitley Online content
Jon W. Whitley  Online Content



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Went and had a closer look and it appears the more rounded fins are facing forward on mine. Runs nice and strong so fine with me. I haven't had it apart yet, but will look when that happens!!



Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#280879 - 10/26/09 2:31 am Re: Question about pre unit T100 alloy barrel [Re: Jon W. Whitley]  
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Tasman Online content
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Tasman  Online Content
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Tasmania - Gateway to Antarcti...
Mine has the same orientation as yours Jon I've just described it differently.
You can see that the fins on the back of the barrel match up with those on the back of the head.


"Live the life you love, find a god you trust and don't take it all too seriously"

Pre-units rule!

Mid fifties Triumph T100
#280886 - 10/26/09 3:21 am Re: Question about pre unit T100 alloy barrel [Re: Tasman]  
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machico Offline
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machico  Offline
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JAPAN
My picture is invisible now. So I post mine again.
Mine is different form tasaman's and John W.


#280887 - 10/26/09 3:27 am Re: Question about pre unit T100 alloy barrel [Re: Jon W. Whitley]  
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machico Offline
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machico  Offline
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JAPAN
Hi Jon W,

Yes, I have never used the NOS barrel and am using new pistons and rings. Thanks for your advice. I will install it the way it came off next time I disassemble it.

Thanks, Jon w!! smile I really appreciate your kind response!!

Thanks,
macico

#280889 - 10/26/09 3:36 am Re: Question about pre unit T100 alloy barrel [Re: RF Whatley]  
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machico Offline
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machico  Offline
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JAPAN
Hi RF Whatley,

That's a nice picture. The GP has a square barrel right?
I thought the barrel is symmetrical pattern isn't it? confused

macio

#280890 - 10/26/09 3:43 am Re: Question about pre unit T100 alloy barrel [Re: Jon W. Whitley]  
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machico Offline
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machico  Offline
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JAPAN
Jon w,

Looks like the sharp end of the fin is front same as tasman's.
Is this race kitted T100? The twin cards look so cool! smile

macio

#280892 - 10/26/09 3:57 am Re: Question about pre unit T100 alloy barrel [Re: Tasman]  
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machico Offline
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machico  Offline
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JAPAN
Tasman,

Surely the fins on the back of the barrel match up with those on the back of the head. That may be the reason why the barrel is installed like that way. I actually don't have the original head...so I didn't notice it... frown
I will use a delta head. smile


macico

#280902 - 10/26/09 8:35 am Re: Question about pre unit T100 alloy barrel [Re: machico]  
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machico Offline
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machico  Offline
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JAPAN
I found something. I am now sure that the correct fitment is to install the barrel with the same way as Jon w & tasman. Bcause the base of the barrel match up with the crankcase if I install the barrel with the same way as yours(sharp fins on front). So mine may be inferior one grin


#281031 - 10/27/09 12:24 am Re: Question about pre unit T100 alloy barrel [Re: machico]  
Joined: Aug 2001
Posts: 6,665
Jon W. Whitley Online content
Jon W. Whitley  Online Content



Joined: Aug 2001
Posts: 6,665
Vermont
It has a few goodies from the T100 race kit and may have had all of it at one time. I am supposed to be swapping heads on this as the manifold has been welded to the head by a PO and I want the single carb option.

You can buy repops of these manifolds but you will have to make an air filter set-up or run with very short screened velocity stacks.

What is the number cast onto your cylinders?





Originally Posted By: macico
Jon w,

Looks like the sharp end of the fin is front same as tasman's.
Is this race kitted T100? The twin cards look so cool! smile

macio


Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#281033 - 10/27/09 12:30 am Re: Question about pre unit T100 alloy barrel [Re: Tasman]  
Joined: Aug 2001
Posts: 6,665
Jon W. Whitley Online content
Jon W. Whitley  Online Content



Joined: Aug 2001
Posts: 6,665
Vermont
Wow Tasman,

Did you do that "custom" job on your head yourself ?!!
I wish I had a spare fin or two to send to you.



Originally Posted By: tasman
Mine has the same orientation as yours Jon I've just described it differently.
You can see that the fins on the back of the barrel match up with those on the back of the head.


Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#281040 - 10/27/09 1:54 am Re: Question about pre unit T100 alloy barrel [Re: Jon W. Whitley]  
Joined: Jul 2007
Posts: 863
Tasman Online content
BritBike Forum member
Tasman  Online Content
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Tasmania - Gateway to Antarcti...
No Jon, it was like that when I got it. There's another on the other side but it's the top fin of the barrel. I'm not sure if I can get these fixed. Hopefully one day I'll find some good ones at a price I can afford.


"Live the life you love, find a god you trust and don't take it all too seriously"

Pre-units rule!

Mid fifties Triumph T100
#281049 - 10/27/09 2:57 am Re: Question about pre unit T100 alloy barrel [Re: Jon W. Whitley]  
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machico Offline
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machico  Offline
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JAPAN
The casting number is E2958. I think this is an early type but the spigot looks late type to me. I am not sure though... How do you distinguish early type from late type? Height of the spigot? confused


Originally Posted By: Jon W. Whitley


What is the number cast onto your cylinders?



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