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Author Topic: Project Return of the MAC - Vintage 350cc Velocette build  (Read 9032 times)

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Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #30 on: March 02, 2019, 09:08:13 AM »
Hi all,

I promised the next post would be back on topic. Here is the latest instalment of my project video. Don't forget to subscribe.

https://www.youtube.com/watch?v=YL3RNZe9xVA

Cheers,

Christian

Offline ProjectROTM

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Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #32 on: April 11, 2019, 04:36:40 PM »
It has been a while since my last update.

Here is instalment 4 of my project. In it I take a brief look at the Cosworth SCA engine for inspiration.

https://youtu.be/X-2_ETvpubY

Offline ProjectROTM

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Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #34 on: September 20, 2019, 07:11:24 AM »
Very slow progress recently on the build, mainly due to moving house.

The garage currently looks like this...

IMG-2732" border="0

...so turning it into a usable workshop is going to be a project in itself.

I did manage to take the bike out to a local Vintage Motorcycle Club day at a nearby stately home earlier in the summer though.

IMG-2586" border="0

Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #35 on: December 30, 2019, 05:45:00 PM »
I have finally got round to making some progress. I have managed to sort the garage out and turn it into a usable workshop.

https://youtu.be/UoHDH_AdmgA

Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #36 on: March 02, 2020, 03:29:18 PM »
Another update on the workshop project. I have always wanted a lathe and this is the first time I have had enough space to squeeze one in!

https://youtu.be/mzxFlAzp2Ns

Offline Koncretekid

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #37 on: March 02, 2020, 04:46:43 PM »
A lathe is so useful I don't know how I would do without one.  Your Velo is looking great.
Tom
We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!

Offline wobblywalrus

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #38 on: March 02, 2020, 05:11:03 PM »
That lathe is great.  It is nice to see you back on the forum.

Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #39 on: March 11, 2020, 08:24:00 AM »
Thanks Koncretekid and wobblywalrus.

I seem to be short on space, time and money. But I am expecting the lathe to be worth its weight in gold when it comes to usefulness. Up until now I have had to try and rush small jobs on a lathe at work in my lunch break, so any job longer than 30 minutes wasn't possible.

Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #40 on: April 20, 2020, 04:28:49 PM »
I hope everybody is keeping well during these very strange times.

Being on lockdown has allowed me to start thinking about the engine in my MAC.

https://youtu.be/5JMXbxOpjLY

Offline WOODY@DDLLC

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Offline thefrenchowl

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #42 on: May 31, 2020, 03:41:40 PM »
Hi ROTM,

I'm on furlow as well, paid by the GB Gov... Getting back some of the monies I gave in taxes over 35 years...

Good luck with the Myford, it is a good tool, I used to have one... However I found over the years it's very hard to do anything other than real small MC jobs on it due to size.

Went one day to a friend to buy some wood working tools and as soon as I enter the workshop, this lathe shouts at me BUY ME... T'was a Raglan Little John from 1947, say 1.5 bigger than the Myford... Got it for ?200 and sold the next day the Myford for twice as much, so a good day all round!!!

Keep on the good work...

Patrick
« Last Edit: May 31, 2020, 03:52:34 PM by thefrenchowl »
Flat Head Forever

...What exactly are we trying to do here?...

Offline ProjectROTM

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #43 on: June 25, 2020, 03:25:56 PM »
Hi Monsieur Owl, that Myford is doing me proud so far.

I have spent a bit of time doing some cylinder head work trying to match the port to the carb.

https://youtu.be/JSfuLCM65Zc

Offline jungblut13

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Re: Project Return of the MAC - Vintage 350cc Velocette build
« Reply #44 on: June 26, 2020, 03:13:46 AM »
The late great Roland Pike knew a thing or two about single  cylinder OHV bike heads. Amongst other things he was responsible for much of the development of the BSA Gold Star in the 1950's. Here is an interesting snippet from his memoirs regarding inlet port work that you may find interesting. i have been following your progress having once owned a very fast MOV that had been used for sand racing. Just toadd, I miss my regular dose of French Fowl Longhi exploits :-D.

ttp://www.beezanet.com/beezagent/rolandpike/roland%20pike%20memoirs.pdf

Excerpt from page 18

One of the strangest occurrances to do with carburettors was when one day Reg Wilkes sent an apprentice from the test shop into our,
main shop for a 1 3/32 GP carburettor and he misread the size and gave Reg: a 1 3/16th carburettor and they immediately got quite a
jump in power. They reported this to me and I went to the shop and the test was repeated and there was no doubt it was quite a gain in
power. I suggested to Reg to open the port to match, immediately we lost what we had gained plus a bit more, so we made a thin
sleeve and pressed it in and the power was back. We repeated this on other engines always with the same results. A number of private
owners of DBD Gold Star noticed the carb being bigger than the port and opened up the port thinking to gain power, but not having a
dyno were not aware of the results. Later on we fitted a venturi behind the carb and picked up even more power. The smallest diameter
of the venturi could be 80% of area of the carburettor. We tested this on several engines and it always worked and seemed to improve
carburation.