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Ruby Mk2 low compression plug

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Ruby Mk2 low compression plug
k8207418 Offline
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Joined: May 2022 Posts: 177 Threads: 45
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Location: Stafford
Car type: Ruby
#1
17-11-2022, 10:04 PM
My head is spinning looking back at old posts re spark plugs 
What the usual plug fitted to a standard engine as above
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David Cochrane Offline
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Joined: Aug 2017 Posts: 487 Threads: 15
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Location: Dunchurch, Warwickshire
#2
17-11-2022, 10:36 PM
Champion D16 or D21, NGK AB6, etc.
http://www.a7c.co.uk
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Howard Wright Offline
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Joined: May 2018 Posts: 2,121 Threads: 111
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Location: Llandrindod Wells
Car type: 29 Special, 30 RK, 28 C Cab
#3
18-11-2022, 07:51 AM
(17-11-2022, 10:04 PM)k8207418 Wrote: My head is spinning looking back at old posts re spark plugs 
What the usual plug fitted to a standard engine as above

Hi

I thought Mk2 Rubys had high compression heads? 

Cheers

Howard
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Tiger Offline
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Joined: Apr 2018 Posts: 507 Threads: 129
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Location: Staffordshire
Car type: Ruby mk 2
#4
18-11-2022, 09:00 AM
Howard
My Ruby has a LC head !
However not sure after 88 years she has the original head ?

PS while discussing plugs a little time ago I posted about the seal on the head.
Looking back I was a bit mixed up however I still have the same leaking plug seal and ask
again does the chamfer on D16 plug aggravate this sorry to labour the point !
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k8207418 Offline
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Joined: May 2022 Posts: 177 Threads: 45
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Location: Stafford
Car type: Ruby
#5
18-11-2022, 11:35 PM (This post was last modified: 18-11-2022, 11:36 PM by k8207418.)
I would be interested in the answer to this
Got some AB6
What gap do I need ?
Thanks
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Tiger Offline
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Location: Staffordshire
Car type: Ruby mk 2
#6
18-11-2022, 11:51 PM
I use 20 thou
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John Mason Offline
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Joined: Dec 2017 Posts: 1,160 Threads: 68
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Location: Nottinghamshire. Robin Hood County
Car type: Austin Ruby Mk1 1935
#7
19-11-2022, 03:57 PM
Not to be rude and correct me if I am wrong but if your Ruby is 88 yrs old would that not make it a Mk1 and thus having a low compression head fitted from new.

John Mason.
Would you believe it "Her who must be obeyed" refers to my Ruby as the toy.
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Tiger Offline
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Joined: Apr 2018 Posts: 507 Threads: 129
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Location: Staffordshire
Car type: Ruby mk 2
#8
19-11-2022, 04:57 PM
Not rude at all John any views on sevens always welcome!
I have the original log book both engine and chassis numbers match with the book.
All the bodywork is as mk2
But still probably not the original head
Regards
Tim
Just realised my error it’s 86 years old !
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k8207418 Offline
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Location: Stafford
Car type: Ruby
#9
19-11-2022, 10:05 PM (This post was last modified: 20-11-2022, 12:33 AM by k8207418.)
Are you we saying Mk2 didn’t have low compression heads ?
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Tony Press Offline
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Location: Malvern, Victoria, Australia
#10
19-11-2022, 10:14 PM
There was briefly a middling compression head around 1935 but in 1936 the so-called 37 high compression (relatively) head was fitted to all Austin 7s.
http://austin7club.org
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