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Swannie
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| Joined: | Sun Jun 3rd, 2007 |
| Location: | B.O.P., New Zealand |
| Posts: | 23 |
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Posted: Wed Jun 27th, 2007 01:54 am |
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| ...thanks Bon...all go fast tips greatfully accepted...Barry.
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davebarkshire
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| Joined: | Mon Mar 31st, 2008 |
| Location: | Exmoor, United Kingdom |
| Posts: | 19 |
| Favourite Bike: | Ariels! |
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Posted: Tue Apr 1st, 2008 07:43 pm |
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| If you're still looking for the Hartley article I have a scanned copy that I can send. This machine was called the 'Zoomer' and was based on a 1926 sv machine. Also if you're looking for anyone else in NZ with and old Ariel I do know of someone there with a 1928 Ariel. Attachment: zoomer-2_small.jpg (Downloaded 142 times)
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Rick Parkington
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Posted: Tue Apr 1st, 2008 10:18 pm |
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That bike has always summed up the whole point of Brooklands and pre-war motorcycling generally to me.
R
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davebarkshire
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| Joined: | Mon Mar 31st, 2008 |
| Location: | Exmoor, United Kingdom |
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Posted: Tue Apr 1st, 2008 10:30 pm |
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The article is very amusing and was written in 1934 when the technology had moved on and people would laugh at the old clunckers like this. The author had a burn up with a modern hot stuff 500 and streaked past him. The writing style of the period is also fascinating.
It would be like coming across a fireblade on your old Panther and blowing it into the weeds.
Here's another one at full chat with Jock West in the chair...
Attachment: Jock-West-Zoomer.jpg (Downloaded 142 times)
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aero
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| Joined: | Wed Dec 27th, 2006 |
| Location: | Cambridge, United Kingdom |
| Posts: | 1060 |
| Favourite Bike: | Hinckley Triumphs and 70's Yamahas |
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Posted: Tue Apr 1st, 2008 10:37 pm |
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the terrible thing would be, fcuking up a gear change at the traffic lights , on board a fireblade, and seeing the panther chuging up the inside in front of you. Shocker.
Last edited on Tue Apr 1st, 2008 10:37 pm by aero
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Rick Parkington
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Posted: Tue Apr 1st, 2008 11:22 pm |
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| Stanger things happen, I pissed all over a bloke on a Z650 through traffic on my 1924 350 side valve flat tanker.
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Swannie
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| Joined: | Sun Jun 3rd, 2007 |
| Location: | B.O.P., New Zealand |
| Posts: | 23 |
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Posted: Wed Apr 2nd, 2008 08:10 am |
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...thanks Dave, Rick and co for you contributions...I have to admit I have little progress to report on the '29 project, my '47 BSA B31 race bike has been hogging all my free time.
Rae and I are coming to the UK in August to a BSA rally being held during practice week for the Manx...anyone on the island at that time?...cheers, Barry.
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Rick Parkington
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Posted: Wed Apr 2nd, 2008 02:31 pm |
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I'll be there for race week but not practice unfortunately.
R
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Justin Faithfull
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Posted: Thu Apr 10th, 2008 05:05 pm |
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In the USA they were were tuning side valves much later than we were (Harley's), & I believe they have some pretty good info. One of their famoue tuners was Tom Sifton. Check out the Victory Library. http://www.victorylibrary.com/main_menu.htm
Come on American forum members tell us what you know about side valve tuning.
Also side valves are back, the continental trials bike manufacturer Gas Gas has just designed a new side valve engine. http://www.gasgas.com/trials_home.htm
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Swannie
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Posted: Tue Apr 15th, 2008 03:59 am |
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| ...thanks for the links J....good to see 4 strokes being used in trials, cleaner emissions etc etc...Barry.
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Swannie
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| Joined: | Sun Jun 3rd, 2007 |
| Location: | B.O.P., New Zealand |
| Posts: | 23 |
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Posted: Sun Apr 27th, 2008 09:30 am |
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...some action at last, picked up a cam yesterday which has got what the owner calls a " Hartley" grind.
It is deffinitly different to the standard ones I have got as the outer lobe has been built up and both lobes ground to be mirror images of each other...maybe even ground at the same time, by the same stone, where the standard cams lobes high points are a few degrees apart...if you are familiar with the item you will know what I'm on about...I think?
Going to send it to the cam doctor and get the profiles recorded so I can get my cams done to the same spec when I'm ready.
Just found Dave B's website, nice one mate, I now have new wallpaper, your '29 beastie, Barry.
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the vintagent
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| Joined: | Sat Jun 7th, 2008 |
| Location: | San Francisco, California USA |
| Posts: | 14 |
| Favourite Bike: | 1933 Velocette MkIV KTT ... |
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Posted: Wed Jun 11th, 2008 03:28 am |
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I've posted some photos of hotrod sv singles on my website
http://www.thevintagent.blogspot.com
as it's a subject of great interest to me. I once tuned a '37 Brough Superior 11-50, and it went very well. I'm in the process of tuning a '25 Sunbeam Longstroke, which has been 'got at' by a DPO, see photo of drilled conrod!
Tuning basics; increase compression (use a 'Ricci Plate', ie a screwed-in lump at the top of the comb. chamber), smooth gas flow (radius the edge of the cylinder on the valve side down to just above the ring travel limit, make troughs for the gas to flow to/from the valves, etc). Bigger valves and much longer valve timing help as well. Sidevalves can tolerate extreme cam timing, as there is no piston to bump, and often the ohv cam from a sister model with directly swap over. Your Hartley grind cam sounds just the ticket!
pd'o
Attachment: IMG_3533.JPG (Downloaded 71 times)
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bradisbetter
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Posted: Wed Jun 11th, 2008 10:56 am |
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We could all avoid this debate by referring to all the KR racers that got up to 50hp from flatheads in the glory days! I love Pommy bikes but i'm still impressed by the way the Americans could still get decent horsepower out of a 750cc flathead! Drugless!1
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the vintagent
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| Location: | San Francisco, California USA |
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Posted: Wed Jun 11th, 2008 07:42 pm |
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I would have to agree that the WR/KR Harley series had some of the best sidevalve development by the 1960's, but of course there were Indians which were faster! In fact, Rollie Free (famous for his Vincent record) tuned some of the fastest Indians in the 1930s', taking a STOCK (ie not stripped - full fenders - and not radically modified) Chief to 114mph at Daytona, on the beach (see photo). He also tuned many Indian engines for private owners on the street and on the track, before moving on to Vincents in the 1950's, after Indian shut down. His motivation was a hatred of Harleys! I highly recommend his biography, 'Flat Out', by Jerry Hatfield - google it.
The essential tuning methods are the same for singles and twins, and we're exploring those on the forum for anyone who wants to produce a little more power from their humble slogger.
Attachment: rolliefree.flat.2.jpg (Downloaded 66 times)
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Swannie
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| Joined: | Sun Jun 3rd, 2007 |
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Posted: Wed Jun 11th, 2008 09:31 pm |
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...nice website Paul, put the Ariel frame on the bench a couple of weeks ago and started adding bits to it, got to get some stuff out from Dragan eventually, Barry.
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integerspin
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| Joined: | Sun Jan 13th, 2008 |
| Location: | Reigate, United Kingdom |
| Posts: | 117 |
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Posted: Thu Jun 12th, 2008 11:12 pm |
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the vintagent wrote: see photo of drilled conrod!
Love the conrod, looks like a hi-lift jack;-)
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the vintagent
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Posted: Fri Jun 13th, 2008 04:23 am |
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Shockingly enough, drilling the rods is still recommended in a tuning manual for Harley WR/KR models which I purchased recently - this is a new publication from Victory. As my rod hasn't broken in 70 or 80 years, I'll keep it for now.
I found the photo here on the web; the barrel has been mildly gas-flowed and the edge of the cylinder radiused - the first step in any sidevalve tuning job. Then comes shaping the combustion chamber for a 'squish' area.
I'm not into Harleys particularly, but am interested in how far they developed the KR - up to 60hp from 750cc, on pump gas. Nothing to sneeze at from a sidevalve.
Attachment: ulbarrel-dotman.jpg (Downloaded 47 times)
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Swannie
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| Joined: | Sun Jun 3rd, 2007 |
| Location: | B.O.P., New Zealand |
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Posted: Fri Jun 13th, 2008 06:35 am |
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...the '29 Ariel I'm considering doing has a one piece head and barrel, very hard to get in there and polish things up.
To be honest with you, since I started this topic, I've bought a job lot of parts which includes a couple of OHV heads so I now have to make up my mind which way to go
...Barry.
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Rick Parkington
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Posted: Sun Jun 15th, 2008 10:33 am |
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My mate Alan Simpson from Liverpool has a 1927 Model C(?) Sports OHV Ariel, that is a quick bike. I couldn't get past him on my Sunbeam over the mountain on the IoM and the 'beam is 5 years newer, a 600 and has one more gear than the Ariel. The Sunbeam tops out around 85mph but will be heavier than the Ariel. Those Val Page OHVs are pretty good, hope you can find an ohv barrel.
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Swannie
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Posted: Mon Jun 16th, 2008 08:59 am |
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| ...cheers Rick...forgot to add that I have a barrel as well...Barry.
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