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by Gannet
Sun May 06, 2012 2:59 pm
Forum: Help
Topic: Compression values
Replies: 18
Views: 4834

Re: Compression values

Thanks for all the interesting comments. It is strange that the ali heads don't (?) seem to suffer the same corrosion level as the crankcase inspite of being connected to a copper gasket. I was also wondering whether the ali spec was diferent, resulting in enhanced corrosion resistance. Although I w...
by Gannet
Sat May 05, 2012 11:04 pm
Forum: Help
Topic: Compression values
Replies: 18
Views: 4834

Re: Compression values

B, Thanks for your comments. I think that you are right that I am not being entirely sensible in the work that i am doing on my FV. Although some people would argue that just owning a couple (or more) Seagulls is pushing 'sensible' to the extreme! Excellent photos of your pressure test set up and ve...
by Gannet
Sat May 05, 2012 9:54 am
Forum: Help
Topic: Compression values
Replies: 18
Views: 4834

Re: Compression values

Hi, Thanks for this info. I have seen various comments such as ' good compression' etc, but have never been able to quantify it. For a 40+/- it would appear that 120 to 140 is a good figure. I haven't been very consistent in noting whether the bore was oily ie whether it had a bit of added 'laid up'...
by Gannet
Thu May 03, 2012 4:17 pm
Forum: Help
Topic: Compression values
Replies: 18
Views: 4834

Re: Compression values

Thank you very much for your help.
From your comments, It would seem that 130psi is a very high figure and that 75psi is an acceptable value, with a likelyhood/expectation that it will increase with use.
Thanks.
by Gannet
Mon Apr 30, 2012 9:23 am
Forum: Help
Topic: Compression values
Replies: 18
Views: 4834

Compression values

I am repairing/restoring an FV which has a compression figure of 75psi. Is this low? Should I strip it down and examine/repace the piston rings? I am not keen to do this unless I really have to. It does start and run in a big water bucket but difficult to assess its performance, although it doesn't ...
by Gannet
Wed Mar 28, 2012 7:48 pm
Forum: General Topics
Topic: Forty Cylinder Blocks
Replies: 0
Views: 1334

Forty Cylinder Blocks

I wonder whether anyone can tell me how to identify the age of 40 cylinder bocks. Are the cast letters BRITISH SEAGULL on the starboard side or SEAGULL on the port side significant?
Thanks for your help.
by Gannet
Fri Mar 02, 2012 5:01 pm
Forum: General Topics
Topic: Paint & Plating Finish
Replies: 12
Views: 3706

Re: Paint & Plating Finish

1. Steel float chamber bowl. I have recently cleaned it and varnished it. I don't think there was any paint on it, but i cannot be sure. It looks to me as it has been (cadmium?) plated. Certainly there was no rust on the outside. 2.The cast arm to which the tiller is attached is a one piece casting ...
by Gannet
Fri Mar 02, 2012 3:46 pm
Forum: General Topics
Topic: Paint & Plating Finish
Replies: 12
Views: 3706

Re: Paint & Plating Finish

SJM832
by Gannet
Fri Mar 02, 2012 2:50 pm
Forum: General Topics
Topic: Paint & Plating Finish
Replies: 12
Views: 3706

Re: Paint & Plating Finish

Thanks for that.
I didn't realise that the exhaust tube was chrome plated. Should the base material of my early 40 minus be aluminium?
Also is the base material of the drive shaft tube steel?
Thanks
by Gannet
Fri Mar 02, 2012 1:57 pm
Forum: General Topics
Topic: Paint & Plating Finish
Replies: 12
Views: 3706

Re: Paint & Plating Finish

Thank you very much for that information. It certainly makes it simple. I presume this includes the flywheel? I fogot to ask about the plating of fasteners ie 1.The dome nut on top of the flywheel. 2. Sundry nuts and bolts. Also the outer drive shaft tube. Is this chrome (on copper and nickel ?)? Th...
by Gannet
Fri Mar 02, 2012 10:42 am
Forum: General Topics
Topic: Paint & Plating Finish
Replies: 12
Views: 3706

Paint & Plating Finish

I am trying to restore my early 40 Minus and want to know what is the original (or best) paint finish on the aluminium parts. Is Hammerite Silver on a chromate primer suitable? Or is a 'plain' silver better?
Thanks.

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