Another vintage project from Great Britain, target Speed Week 2011

[octane]

FYI: I wasn't talking about driving it from the timing side.  Drive the jackshaft from the primary side as you have it - the jackshaft crosses the crankcase and drives the blower from the right (timing) side.  It would be extra brackets, shaft, pulleys and belts, but then the blower is rotating the correct direction.
Tom B.

Something like this set-up on a Norton, perhaps:










BTW;
You might not want to see this,
but this is how it ended up:

Auuuuuurgh !

[Koncretekid]

Exactly, only hopefully without the same result.  Note, also, that there doesn't seem to be any overdriving of the supercharger.  Looks like something like 4 to 3 , then 3 to 4, which of course equals 1 to 1.  And still .....  A large pop-off valve would definitely be indicated.

[bubuche]

salut patrick

ton projet avance bien

merci pour le tableur de calcul poulie

pour ton reservoir si tu me donnes les dimensions on peut le fabriquer sur mesure

a+ bubuche

[thefrenchowl]

Hi Octane,



Ouch indeed!!! but looks to me more like a flywheel failure, nothing to do with the supercharger???

I looked again at me bike, anything driven from the right hand side would hit the rear pipe, no matter if driven from timing shaft or jack shaft. Also  8-) I fail to see what would I gain with one more pulley and an extra jack shaft?

On a Sporty, fair enough, the manifold points to the right, but the K one points to the left.

Merci pour ton offre, Bubuche, on verra un peu plus tard!!!

Patrick

[thefrenchowl]

Hum, Regular as clockwork... Hi All,

The 2"1/2 elbow for the plenum did not show up on Friday, it will now be Monday at the earliest

A coworker gave me a TIG welder the other day, so just the day today to try and have a go on the carb manifold... Already had a small gas bottle with a flowmeter. Got no igniter on the welder so I've got to strike it right 1st!!!

I don't have much tooling and looked around for something to use as a jig to square all the bits... This 70s Sporty disc and hub just looked right!!!







Just tacked it... Had the supercharger flange the wrong way round... so done it again right... Just presented on the bike to check clearances, just need now to cut some strips to fill the voids...







Will do some more tomorrow!!!

Patrick

[wobblywalrus]

Old standard practice was to check the torque on the cylinder base nuts after every heat in the race.  In other words, if the bike went out on the track three times the base nuts would be checked three times.  Properly tightened nuts would distribute the combustion loads evenly around the base flange and prevent cracking like that seen on the Norton, most of the time. 

[panic]

True - if you're still using the original 16830-54 base studs, you should replace them with the longer 16830-72.

[thefrenchowl]

Hi Jeff,

If I use the longer 16830-72 studs, do the cases need threading deeper? (I hate touching stuff that looks OK!!!)

Good progress today, had a good garage clean up, it was starting to look messy... Then did some serious grinding in the plenum to smooth out the transition between the 2"1/2 pipe and the nipples...

I started on the bottom bit here, but the top is untouched, you can judge the steps!!!



Bit more, nearly there...



Then polishing... It's not perfect but it'll do for today!!!





Moded slightly my twin carb manifold alloy clamp and welded 2 nuts on the plenum, I'll have to improve my TIG welding...





Also measured a few things to draw on auto CAD for the other end of the plenum... All that this morning.

Afternoon, I spent redoing some brackets for the fairing, but evening came, no lights so no photos!!!

All the best from Patrick

[panic]

Some cases are tapped deeper than the thread, no way to tell.
If you have enough thread showing, you can use a triangular washer under the nut, or the KR nut, or both to spread the load over more flange area.

[ironwigwam]

do you mean washers like these?

[thefrenchowl]

Hum, Ironwigwam,

Some serious inlet ports!!!

Patrick

[ironwigwam]

Patrick, Yes they are even serious cylinders as they are a welded construction from 4130 steel, totally hand made, no stock castings involved here

[38flattie]

Ironwigwam, those are bad-azz cylinders!


Patrick, the build is coming along great!

[thefrenchowl]

Hi All,

Well, the 2"1/2 bend is at the supplier, but he was working overtime away all week end, so no progress to report on the "glamourous" engine bits...

Instead, worked today on more "mundane" stuff, like making brackets for the fairing. Not quite finished...







Patrick

[thefrenchowl]

Hi,

I went to pick up the bend yesterday evening at Neil's... He's quite busy so t'was very late but couldn't resist having a look later in the garage.



And started squaring off the straight pipe to join to the Ansin outlet flange...



And the postman just dropped a notification to pick up gear at the post office, these are magneto bits from California, will post some more later in the day...

Looks like another busy week end ahead!!!

Cheers from Patrick