classic car forum header
Classic cars forum & vehicle restoration.
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Register     Posting Photographs     Privacy     F/book OCC Facebook     OCC on Patreon

dwell from points gap
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Electrical Restoration
Author Message
Timstopp



Joined: 16 Oct 2008
Posts: 98
Location: colchester, essex

PostPosted: Fri Dec 11, 2009 10:50 am    Post subject: dwell from points gap Reply with quote

Forgive me if this is a stupid question, but is it possible to work out what the dwell angle should be from the points gap (even if it is in a "range" for a 4 cylinder car. I've guessed that the correct points gap should be 12 thou (from similar aged cars) but would like to check the actual dwell to elimainate dizzy wear.
Thanks
Tim
_________________
North Essex,UK - Morris 8 tourer 1936 - Jaguar x350
Back to top
View user's profile Send private message Send e-mail
Phil - Nottingham



Joined: 01 Jan 2008
Posts: 1252
Location: Nottingham

PostPosted: Fri Dec 11, 2009 11:09 am    Post subject: Reply with quote

50-60 for 4's and 34-39ยบ for 6's but all dizzies have their own optimum setting. Pre-war have a lower gap generally - increased dwell gives smaller gap
_________________
Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2


Last edited by Phil - Nottingham on Fri Dec 11, 2009 11:43 pm; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
ukdave2002



Joined: 23 Nov 2007
Posts: 4100
Location: South Cheshire

PostPosted: Fri Dec 11, 2009 4:57 pm    Post subject: Reply with quote

My Morris 8 is 10 to 12 thou,

You can get away with a small gap with low revving engine's, smaller gap also give the coil the longest "charge" time, which if its 6v it needs!

Dave
Back to top
View user's profile Send private message Visit poster's website
Phil - Nottingham



Joined: 01 Jan 2008
Posts: 1252
Location: Nottingham

PostPosted: Fri Dec 11, 2009 5:17 pm    Post subject: Reply with quote

Quite so and lathough my prewar Rover is a 6 cylinder with 12v electrics it will not run with well at all with a gap larger than 14 thou yet 1964 P5 3 Litre needs a 16 thou gap with its "high performance" HA12 coil. Its needs wide plug gaps too 29 thou but the prewar are 20thou
_________________
Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2
Back to top
View user's profile Send private message Send e-mail
cswagon



Joined: 06 Dec 2009
Posts: 18
Location: hereford

PostPosted: Fri Dec 11, 2009 10:32 pm    Post subject: Reply with quote

Would anyone know the correct dwell angle for a Triumph 1500 FWD engine please ?
Thank you
Graham.
Back to top
View user's profile Send private message
Jim.Walker



Joined: 27 Dec 2008
Posts: 1229
Location: Chesterfield

PostPosted: Fri Dec 11, 2009 11:05 pm    Post subject: Reply with quote

If it is a Lucas distributor it will be 60 degrees.
_________________
Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then!
Back to top
View user's profile Send private message
Timstopp



Joined: 16 Oct 2008
Posts: 98
Location: colchester, essex

PostPosted: Sat Dec 12, 2009 7:26 pm    Post subject: Reply with quote

thanks, so much. Sounds like setting to a dwell of 60 deg is worth a go as I have a modern 12v coil fitted, which should set the points 10-12 thou (Ihope)
_________________
North Essex,UK - Morris 8 tourer 1936 - Jaguar x350
Back to top
View user's profile Send private message Send e-mail
cswagon



Joined: 06 Dec 2009
Posts: 18
Location: hereford

PostPosted: Sat Dec 12, 2009 10:27 pm    Post subject: Reply with quote

Sorry Jim, serves me right for hijacking a thread.
Did you mean 60 degrees for my Triumph engine? And yes, I do have a Lucas distributor.
Thanks
Graham.
Back to top
View user's profile Send private message
Phil - Nottingham



Joined: 01 Jan 2008
Posts: 1252
Location: Nottingham

PostPosted: Sat Dec 12, 2009 11:18 pm    Post subject: Reply with quote

60 seems to high for postwar Lucas dizzies try 56/57
_________________
Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2
Back to top
View user's profile Send private message Send e-mail
Jim.Walker



Joined: 27 Dec 2008
Posts: 1229
Location: Chesterfield

PostPosted: Sat Dec 12, 2009 11:49 pm    Post subject: Reply with quote

I would not presume to argue with the experts Phil. My Trade Autodata Manual gives 57 to 63 degrees for all 25D4 Lucas distributors I can find whatever they were fitted to including the Triumph in question. Hence 60 degrees nominal.
I have always set them as close to 60 as possible with excellent results Graham.
_________________
Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then!
Back to top
View user's profile Send private message
Timstopp



Joined: 16 Oct 2008
Posts: 98
Location: colchester, essex

PostPosted: Sun Dec 13, 2009 12:16 am    Post subject: Reply with quote

Now I am confused, which of this applies to my question and which to 1960's triumphs!
Is 60 deg correct for 1930's lucas or 1960's??????
_________________
North Essex,UK - Morris 8 tourer 1936 - Jaguar x350
Back to top
View user's profile Send private message Send e-mail
Phil - Nottingham



Joined: 01 Jan 2008
Posts: 1252
Location: Nottingham

PostPosted: Sun Dec 13, 2009 12:57 am    Post subject: Reply with quote

Both - but always the higher for pre-war Lucas as had narrower gaps
_________________
Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2
Back to top
View user's profile Send private message Send e-mail
Timstopp



Joined: 16 Oct 2008
Posts: 98
Location: colchester, essex

PostPosted: Sun Dec 13, 2009 11:54 am    Post subject: Reply with quote

excellent! thank you very much!
Oops , just noticed my last post looked a bit grumpy, it wasn't meant to be I was just tired Embarassed
_________________
North Essex,UK - Morris 8 tourer 1936 - Jaguar x350
Back to top
View user's profile Send private message Send e-mail
cswagon



Joined: 06 Dec 2009
Posts: 18
Location: hereford

PostPosted: Sun Dec 13, 2009 9:11 pm    Post subject: Reply with quote

Many thanks to you all for that, I shall try this setting this week hopefully.
And sorry Tim for jumping your thread and confusing matters.
Graham.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Electrical Restoration All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
OCC Merch link
Forum T&C


php BB powered © php BB Grp.