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Author: Subject: Under starters orders
crusty
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[*] posted on 11-11-2010 at 11:51 AM
Under starters orders



Hello Cubbers,
As the strong winds didn`t blow the roof off my shed today I reckon it`s passed the workshop worthiness test.The four sides had a quick coat of paint before the summer ended.Next step is to have a clear-out so the project can be placed inside the shed!
It started with a frame,then crankcases....you get the picture,so dry run assembly required to make sure it all fits together before creating the real McCoy.Of course still need a few parts yet!
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[*] posted on 11-11-2010 at 01:15 PM


Is that a 17" stool or bigger, Crusty?
I guess you've got the makings of a Tiger Cub there. Not long till Spring and Santa can be primed for goodies :)
Martyn




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spanner
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[*] posted on 11-11-2010 at 02:16 PM


Lick of paint n your away.....
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crusty
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[*] posted on 11-11-2010 at 04:47 PM


Santa wears a dress,equality and all that(no beard fortunately!), but she`s heard the words "Tiger Cub"one too many times this year......wheel(ahem) see,you never know!

Paint???No such extravagance!
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[*] posted on 11-12-2010 at 09:21 AM


Haha, nice one! Just about ready to roll....good luck!



Cub dedicated magazine at www.thecubmag.com. Follow Cubbie's travels at www.gorgeousbikerchick.com
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crusty
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[*] posted on 11-12-2010 at 01:13 PM


Thanks very much.

Hopefully will be a reasonable job what with all the great tips from this site...have been paying attention and taking notes on all the Cub idiosyncrasies!(Hurrah for spell check!)

Looks like someone`s already reworked one of the cylinder heads in my parts box....porting and external oil drainage tubes.

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[*] posted on 11-13-2010 at 03:37 AM


Doesn't appear to be much room in the shed Crusty

Why not take it indoors - apart from being warmer it would make an unusual conversation piece

Jim :D
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[*] posted on 11-13-2010 at 03:49 AM


Crusty, does the head on the left retian its original oil drain holes through the gasket and barrel?
More imprtantly, does it (or did it) cure the weeping rocker box cover problem?
Martyn




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[*] posted on 11-13-2010 at 08:50 AM


Hi
Probably also cures the occasional smoke due to oil going down the guide...
I've never seen that mod before...Is the alloy tube drilled and tapped into the gallery or welded or ...something else ?
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[*] posted on 11-13-2010 at 10:16 AM


I've seen this mod before I once bought a square barelled head from the states and this had the same type of mod done and also the rocker covers had breather pipes fitted I still have them in the drawer.

scott.
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[*] posted on 11-13-2010 at 12:18 PM


By 'eck Scott, tha must 'ave big drawers.

Oh, sorry, you mean as in sideboard drawers, not as in trousers. :P

I've seen photographs of American variations on this theme and often wondered if the original drains are sealed or not and if the modification cures the dreaded seepage.
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[*] posted on 11-13-2010 at 02:38 PM


You`re right about the shed,but it`s worse than that Jim,there`s no room left indoors!Maybe the Cub will muscle the rest out and have pride of place?

Martyn,the original drain holes haven`t been bunged up.Haven`t seen this head in operation...yet,that`s a little way off.The barrel has the top machined down to provide an insert flange to the head`s recess.If my memory serves me right,something like the Continental GT set up....cyl head lapped in with valve-grinding paste to the barrel,no head gasket

Jinx,yes it`ll be interesting to see whether it`s a worthwhile mod and look forward to tidying it up a bit and fitting it as discretely as possible.Head`s drilled&tapped and little alloy tubes dyed down.

Scott,only got the ordinary finned alloy rocker covers with no breather pipes but may weld/bolt some on.Would be interested in seeing a pic of the ones you have?

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[*] posted on 11-13-2010 at 02:42 PM


The tubes will need reducing a bit with discrete fitting of pipe-work.

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[*] posted on 11-13-2010 at 02:44 PM


Tubes removed.

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[*] posted on 11-13-2010 at 02:47 PM


...and the strange barrel mod,wonder what piston was fitted?Not a std high comp one!

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[*] posted on 11-13-2010 at 06:54 PM


Hi
yeah...that barrel top shoulder mod is something I last saw on a German bike around 1956...real precision work....very cool
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[*] posted on 11-14-2010 at 01:12 AM


Thanks Crusty.
The spigot on the barrel for the head is similar to the one on my 1955 T100 - but that uses a solid copper gasket which is annealed, and besides - it uses two liners in an alloy barrel.
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[*] posted on 11-14-2010 at 04:54 AM


Maybe it was cheaper for previous owner to remove c5mm from around top of barrel than purchase a high comp piston?Will have to get the plasticine and solder wire out for the dry-run valves-to-piston clearance test.
I would have left more meat on spigot-flange when machining top of barrel and widened dia of recess in head,but then I`m no trained lathe man.
Will tap out oil return holes in head&barrel and put grub screws in to blank them.
Don`t own an internal micrometer(spose I should get a Draper one for 22),only have an external type.Will have to see if bore is good-to-go and if it wont take a rebore then maybe track down the chap who re-sleeved a bantam barrel for me the other year.
Wont be sufficient fin cooling area on these Cub oval barrels to entertain a bigger bore conversion would there?It`s just that a sleeve costs approx 50 whatever the bore size,within reason.
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[*] posted on 11-14-2010 at 07:47 AM


Hi
On the German bike I mentioned (it was a Hercules as I remember) the cylinder had a very slight taper on the outside of that shoulder and the head had the same taper on the inside of it's shoulder. When you tighten down the head it would seal without any gasket.!..If you took in your hand the head and cylinder and pushed them together, they would "seize" and stick together. ..apparently the tapers doing the sealing....... Is that what we're seeing here??....or is a copper gasket still used?
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[*] posted on 11-14-2010 at 12:05 PM


Jinx,
Suspect my set-up would need a copper head gasket but would be interesting to see if it would seal after lapping in head to cylinder with valve-grinding paste,as in the RE 250 GT Continental?
Realised that it probably wont be necessary to fit breathers to the rocker boxes if I`m blanking the old oil drain-holes and utilising the new drain-back system.There will be no ingress of crankcase pressure to the head.Will be fitting new valve guides,modern piston rings and a crankcase breather....I like my engines fairly leak-free.
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[*] posted on 11-14-2010 at 02:51 PM


Beware, crank case pressure can still get to the rocker boxes up the push rod tube.
Martyn




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[*] posted on 11-14-2010 at 03:27 PM


Thanks Martyn,silly me,forgot about those two little holes.Hopefully the crankcase breather will sort that out though.Don`t really want my Cub engine looking too much like it`s connected to a life-support machine.
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[*] posted on 11-15-2010 at 01:26 AM


Crusty, the Triumph oil return from the head normally returns via the holes through the head and barrel to the crank case.
How do you connect the return from the set up that your head has?
Martyn




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[*] posted on 11-15-2010 at 03:11 PM


Dunno Martyn,good question,haven`t got that far yet.Presumably it has to be plumbed in before the scavenge side of the pump and not after.Obviously it can`t be fed straight into the crankcase void because that will defeat the object.Not looked at the crankcases yet but got the single and split types,although for this project prefer to use the latter.

I love working these things out and will post the result here.
Cheers,Crusty.
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[*] posted on 11-15-2010 at 03:37 PM


Crusty, for what it's worth, I think they should be taken to the push rod tube which should be fitted with a collecting feed and drained back to the crank case via the two holes in the tappet block.
If you look in the Bible on pages 84 & 85 you will see this arrangement on Gary Nixon's Cub.
It is also used on my 55 T100 on inlet and exhaust.
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