Another vintage project from Great Britain, target Speed Week 2011

oz · April 09, 2011, 11:29:07 PM

Very tidy nicely done dude!!

Peter Jack · April 10, 2011, 01:26:21 AM

Patrick, check your messages.

Pete

38flattie · April 10, 2011, 04:11:28 AM

Looking good Patrick!

thefrenchowl · April 16, 2011, 03:57:45 AM

Hi all,

Yes, it's starting to look like a bike, not just an engine in a frame with loads missing...

Thought I would show you today where I do the built!!! The garage is about 7.5 feet wide by 30 feet long, split in 2, "storage" and "workshop"... So a bit on the small side!!!

I finished the rear exhaust pipe yesterday evening, went to bed at about 1am, but up early today and, sunny outside, time to wheel it out to see if it looks OK from a distance... Also fitted the race numbers.

Did about 1/2 of the intake manifold this morning, it's better with the new TIG torch, but not that much!!! I suppose practice makes perfect, I'll get there in the end...

See you later!!!

Patrick

saltwheels262 · April 16, 2011, 06:46:59 AM

patrick,

meant to mention--

if you have a lack of fuel issue, you can machine a
float bowl extension using a float bowl gasket as a template.
we used to make them a good 1.5" wide. not sure how
close the rear wheel spokes are.

is that an s&s float bowl?

franey

bak189 · April 16, 2011, 08:03:48 AM

Looking great, I just love the "old" Harley's.........Keep in mind the Tom Evans (SCTA Tech) might require you to have a cover/shield over the blower belt..............................

ol38y · April 16, 2011, 08:09:17 AM

Yeah, very nice. Keep in mind at Bville, running out of fuel is common in gravity feed fuel systems. Be sure you have a very good vent on your tank and less restrictive fuel lines.

Look forward to seeing your bike on the salt.

thefrenchowl · April 16, 2011, 05:08:49 PM

Quotesaltwheels262: is that an s&s float bowl?

Yes, good old S&S MGAL with side bowl... I will ask Tom Evans if it's OK to pressurise the fuel tank... cause room is limited for float chamber extension!!! I will also do a fuel flow rate test once my 3/8 feed pipe is installed... I need the fuel to flow somewhere around .8 to 1 litre per minute.

Quotebak189: Tom Evans (SCTA Tech) might require you to have a cover/shield over the blower belt

Even if Tom will not insist on a belt cover, I still value me left leg, so I'll make one later!!!

Quoteol38y: Look forward to seeing your bike on the salt

I'm doing me best!!!

Ran out of TIG tungsten rods AND S/S filler rods, so worked on other things this afternoon... Got the rear wheel out to clean, did a grinding/filling job on the Ansin bearings shield since it's in the way of the belt bracket and worked on my drive ratios/piston speed/speed calcs excel spread sheet to see what's the best sprocket combination to use... Hum, too many permutations!!!

Thanks for your interest, all the very best from Patrick...

grumm441 · April 17, 2011, 12:41:00 AM

Patrick
I'm pretty sure Tom will require you to run a belt cover on the blower belt
Although there is nothing specific in the rule book

As for the fuel pump, why don't you run a vacuum pump off a Ducati
G

Koncretekid · April 17, 2011, 06:27:52 AM

Harleys don't vibrate, right? If this were a BSA single, with all that rigid tubing from motor to blower, and from blower to carburetor, the motor would find someway to get away from the attachments! A rubber hose connection here and there might be a good idea.
Tom

thefrenchowl · April 17, 2011, 10:59:17 AM

Hi, Koncretekid

Yes, Harley vibrate,

... but not in the way Brit bikes vibrate!!! I well remember a winter trip to one of these die hard rallies in the 70s as the frozen and numbed passenger of a friend's Velo Venom...

The plenum is already split in two and the carb manifold will be as well in due time when I know how far away the carb will be.

grumm441, what are they driven off, these Dukes fuel pumps? If it's from a battery, forget it, I haven't got one on the bike... Old Guzzi racers with side saddle tanks use to have one actuated by the swing arm, neat idea...

Patrick

38flattie · April 18, 2011, 04:11:55 PM

Patrick, the build looks real trick!

All the Duke pumps I've seen have been electrical. How about a small gear driven or belt driven mechanical pump, like an Enderle or similar? Looking at your fab capabilities, I don't think making a drive for the pump would be a problem!

I've got one for a 3-71/4-71 blower, and I think you might even be able to rig a speedo cable to it and run it.

I'll send it to you, if you decide to go that route.

panic · April 18, 2011, 08:12:53 PM

Do you have enough pressure cycling in the case to use a snowmobile (diaphragm) pump?

Nortonist 592 · April 18, 2011, 09:55:28 PM

Patrick, It looks very handsome. I would definitely make a guard for the blower drive belt. I would bet money that Tom will ding you on that. Although there is nothing specific in the rules I would guess that rules 7.B.22 and 7.H.22 might be quoted. Far better to have the belt covered than to get to Bonneville and have to scramble to make a cover.

RidgeRunner · April 19, 2011, 04:32:49 AM

Quote from: panic on April 18, 2011, 08:12:53 PM
Do you have enough pressure cycling in the case to use a snowmobile (diaphragm) pump?

I do know pulses from the exhaust pipe will run a snowmobile diaphram carb on a 4 stroke single. Helped to prime it for starts though.

Have no idea how much pressure would build with a separate diaphram pump for the volume required for this application.

Ed

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Another vintage project from Great Britain, target Speed Week 2011