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Old 01-20-2017, 12:53 AM   #21
Hoofhearted
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Default Re: 1949 Ariel Square four

You need to find a Shorrocks blower and have a bit of fun.

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Old 02-13-2017, 03:22 PM   #22
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Default Re: 1949 Ariel Square four

I was volunteering on a Corvette Drag Racing team in Orlando Florida back around 1969 and was given a 1958 Square Four MKII that had been altered a bit and given up on. Had it for two years, keeping it on the road was a chore at times but you could still get parts back then. Voltage regulators were a constant source of problems, cooling on the rear cylinders was always a concern, causing rear exhaust valves to stick in the guides (solved by adding a little caster oil to the gas). It was one of the fastest bikes around 0-65 and then it ran out of gears. I made a larger trans sprocket but it just didn't have the horsepower to cover the taller gear ratio. The exhaust would build up an oily residue in the pipes and when getting off the freeway it shoot big balls of fire from the stacks. Alas I discovered Harleys and eventually sold the bike.
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Old 02-13-2017, 05:34 PM   #23
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Default Re: 1949 Ariel Square four

Great pics Pony!
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Old 02-14-2017, 12:53 AM   #24
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Default Re: 1949 Ariel Square four

...and great first hand experience in-put

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Old 02-14-2017, 06:25 AM   #25
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Default Re: 1949 Ariel Square four

and, still waiting for parts...sigh....
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Old 02-14-2017, 01:54 PM   #26
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Default Re: 1949 Ariel Square four

You might enlist the help of our brothers from the other side of the pond for any leads to possible parts suppliers. The head gasket could be an issue due to age as I had problems even back then. I eventually bit the bullet and surfaced the head, block and made a copper head gasket.
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Old 02-14-2017, 02:00 PM   #27
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Default Re: 1949 Ariel Square four

Quote:
Originally Posted by Hoofhearted View Post
You need to find a Shorrocks blower and have a bit of fun.

that the coolest bike ive seen in years! And i see 10 knuckchops a day on my instagram feed. Doesnt it have a very long tank?
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Old 02-14-2017, 02:29 PM   #28
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Default Re: 1949 Ariel Square four

Found some more pictures of the Ariel.
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Old 02-14-2017, 02:43 PM   #29
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Default Re: 1949 Ariel Square four

Quote:
Originally Posted by PONY View Post
You might enlist the help of our brothers from the other side of the pond for any leads to possible parts suppliers. The head gasket could be an issue due to age as I had problems even back then. I eventually bit the bullet and surfaced the head, block and made a copper head gasket.
Good advice...parts are coming from a UK Ariel specialist.
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Old 02-14-2017, 02:52 PM   #30
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Default Re: 1949 Ariel Square four

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that the coolest bike ive seen in years! And i see 10 knuckchops a day on my instagram feed. Doesnt it have a very long tank?


Perhaps fuel / oil combined to make room for the blower?
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Old 03-05-2017, 12:40 PM   #31
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Default Re: 1949 Ariel Square four

Finally!!! The bearings/ bushings I need to start getting the bottom end of this engine have arrived! The original package must have gotten lost somewhere along the way, so they sent out a replacement. Will be taking the cranks to the machine shop this week for a regrind and will start cleaning up the crankcase halves and fitting the new bits and pieces.
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Old 03-05-2017, 01:16 PM   #32
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Default Re: 1949 Ariel Square four

Oh boy oh boy oh boy
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Old 03-06-2017, 11:32 AM   #33
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Default Re: 1949 Ariel Square four

Am watching with lots of interest, way, way back in ancient history when I was living in Calif., I had a buddy with an Ariel square four, he let me ride it a couple of times, always wanted one but just never ran across one out here in Hawaii....
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Old 03-08-2017, 02:25 PM   #34
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Default Re: 1949 Ariel Square four

Get back to work on the Commando!!!!
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Old 03-08-2017, 04:52 PM   #35
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Get back to work on the Commando!!!!
No worries, that is getting some attention too.
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Old 03-09-2017, 11:05 AM   #36
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Default Re: 1949 Ariel Square four

Around 14.47...


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Old 03-10-2017, 04:39 PM   #37
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Default Re: 1949 Ariel Square four

Ok...got the cranks sent off to the machine shop first thing this week...got 'em back today...nice looking work, checked the measurements to make sure...all good!
Also got the crankcases cleaned up and new bearing races installed in the drive side. Now that I have the cranks back I can machine the new timing side bushing before I get them fitted, will also need to establish the axial thrust, test fit the rods and reassemble the crank balance weights and flywheels.

Crankcases before cleaning



Crankcase after



Reground cranks

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Old 03-16-2017, 05:46 PM   #38
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Default Re: 1949 Ariel Square four

Got a few more things done this week, got the new crank bushings machined and fitted to the timing side crankcase, they needed to be modified to allow the oil to pass around the bushing shells (like the original ones). The thrust shoulders had to be machined down as well, but I left them at the larger diameter, so I could pin them to keep them from turning. After that I put the cranks in and established the thrust clearance. With that out of the way, I decided to fit the connecting rods and check the clearance with a bit of Plastigauge. Everything measured up properly, so the flywheels and counter weights were fitted back on the cranks. I thought I was going to be held up waiting for the oil scavenging pipe, but I found a new one on the sixth try of digging through the parts. With that bolted in place I can put the crankcase halves together and mount the connecting rods and camshaft. This thing has a weird little oil pressure relief valve that goes on the timing end of the front crankshaft...it didn't have any guts, but again with some digging I located a new pressure relief valve spring and ball and got that together...this is almost like going back to school...a lot of things are similar to other British bikes, but there are a lot of unique little differences that you have to pay attention to.

I think Photobucket is on the fritz tonight...I'll try posting pics again tomorrow.
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Old 03-17-2017, 01:33 AM   #39
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Default Re: 1949 Ariel Square four

Goldy, what brass material did you use for the crank bushings?
What a great thread!

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Old 03-17-2017, 05:06 AM   #40
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Default Re: 1949 Ariel Square four

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Goldy, what brass material did you use for the crank bushings?

Lester
I was going to use Rotocast Bronze, but Draganfly had babbit lined replacement bushings available in 0.100" undersize. I had to machine them to 0.010" under to fit the regrind.

I've used rotocast on several other jobs, in fact one came back to me recently that I had machined about 25 years ago. It wears well and is very easy to work with. Had I not been able to get the babbit lined ones, I wouldn't have thought twice about using the Bronze instead.
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Last edited by Goldy; 03-17-2017 at 05:44 AM.
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