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by allan.walker
Wed Feb 03, 2021 7:16 pm
Forum: Four stroke
Topic: Square Four top-end interchangeability.
Replies: 4
Views: 183

Re: Square Four top-end interchangeability.

Thanks Paul.
by allan.walker
Wed Feb 03, 2021 2:16 pm
Forum: Four stroke
Topic: Square Four top-end interchangeability.
Replies: 4
Views: 183

Re: Square Four top-end interchangeability.

Thanks Markus.
Is this because the stud/bolt positions are different, or because the finning is contoured at the side on a Mk2 for exhaust pipe clearance?
by allan.walker
Wed Feb 03, 2021 9:20 am
Forum: Four stroke
Topic: Sq4 Breather
Replies: 3
Views: 215

Re: Sq4 Breather

I haven't tried to do this, but if the oil tank vent pipe is meant to vent air pressure to atmosphere and the engine breather pipe is meant to do the same, it would seem that connecting the two together would prevent both vents from doing their job.
by allan.walker
Wed Feb 03, 2021 9:18 am
Forum: Four stroke
Topic: Square Four top-end interchangeability.
Replies: 4
Views: 183

Square Four top-end interchangeability.

Will a Mk1 head fit on Mk2 barrels, and vice-versa?
by allan.walker
Mon Jan 18, 2021 8:30 am
Forum: Four stroke
Topic: Lockdown: Time for big service, changes and improvements of my SQ4
Replies: 15
Views: 778

Re: Lockdown: Time for big service, changes and improvements of my SQ4

HI Allen, The picture with the scales shows a BSA connecting rod as example. I got a bunch of new AOMCC con rods after one of my old ones got cracked (fatigue fracture ). And so I got the booklet that I have my knowledge of. In the excerpt from the booklet you can also read that you would need a lo...
by allan.walker
Sun Jan 17, 2021 12:43 pm
Forum: Four stroke
Topic: Lockdown: Time for big service, changes and improvements of my SQ4
Replies: 15
Views: 778

Re: Lockdown: Time for big service, changes and improvements of my SQ4

Hi Allen, I followed exactly the AOMCC con-rod booklet (by Bruce Longman). I weighed the con-rods and determined the proportion of the big end. Then I used strips of lead to simulate the determined weight. I tightened these strips around the crank pins and then turned the crankshaft on the balancin...
by allan.walker
Sat Jan 16, 2021 3:59 pm
Forum: Four stroke
Topic: Lockdown: Time for big service, changes and improvements of my SQ4
Replies: 15
Views: 778

Re: Lockdown: Time for big service, changes and improvements of my SQ4

Hello Rudolf,
Some fine cars there!

Nice work on the Square Four, too. May I ask how you balanced the crankshafts? I know what Mallory metal is, but what procedure did you follow to determine where to add or remove weight, etc?

Allan.
by allan.walker
Tue Jan 12, 2021 1:43 pm
Forum: Four stroke
Topic: Distributors for SQ4
Replies: 13
Views: 705

Re: Distributors for SQ4

Clockwise, counter-clockwise........doh! :oops:
by allan.walker
Tue Jan 12, 2021 10:25 am
Forum: Four stroke
Topic: Distributors for SQ4
Replies: 13
Views: 705

Re: Distributors for SQ4

I've just found a counter-clockwise DK4 electronic distributor on the Powerspark website, priced at £199.99. It seems that this is only available in negative earth configuration.
by allan.walker
Mon Jan 11, 2021 10:58 am
Forum: Four stroke
Topic: Distributors for SQ4
Replies: 13
Views: 705

Re: Distributors for SQ4

You can buy a brand new one, complete with distributor cap and rotor arm, plus electronic ignition from Powerspark in Bromsgrove for about £130 but they aren't the easiest to time up on a Square. Hi Paul, I emailed Powerspark (via their Ebay listing) about the DK4A and its suitability for a Square ...

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