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

creating timing marks
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Electrical Restoration
Author Message
Rdover



Joined: 26 Nov 2007
Posts: 413

PostPosted: Thu May 10, 2012 3:16 pm    Post subject: creating timing marks Reply with quote

Having converted my car to coil/dizzy from magneto, it would be nice to now try to get it timed up a little more scientifically than "mmmm .... errrr ... aye, that'll do".

I know where TDC Cyl 1 is and the circumference of the flywheel is 1080mm. Do I simply divide 1080mm by 360 to give the distance between degree marks (3mm)? Or am I missing something obvious?

If I'm right, then static timing should be ~35deg btdc or 105mm before the tdc mark. It then becomes easy to mark up 30deg to 40deg range so I can see what I'm doing when I adjust the dizzy.

Any stating of the bleeding obvious greatly appreciated
_________________
Richard
Back to top
View user's profile Send private message
Penman



Joined: 23 Nov 2007
Posts: 4750
Location: Swindon, Wilts.

PostPosted: Thu May 10, 2012 3:59 pm    Post subject: Reply with quote

Hi
Yes that is the correct way to find the length of 1 degree etc

Out of interest, how did you measure the circumference and have you done a ΠD (2ΠR) calculation to check it?
_________________
Bristols should always come in pairs.

Any 2 from:-
Straight 6
V8 V10
Back to top
View user's profile Send private message
Rdover



Joined: 26 Nov 2007
Posts: 413

PostPosted: Thu May 10, 2012 4:12 pm    Post subject: Reply with quote

I used a bit of string!

I did use piD to check it as well but It was last year so I'll re-measure and re-calculate a few times before marking anything up.
_________________
Richard
Back to top
View user's profile Send private message
Uncle Alec



Joined: 14 Jan 2008
Posts: 734
Location: Manchester

PostPosted: Thu May 10, 2012 4:45 pm    Post subject: Reply with quote

Exactly what are you timing here Rdover? Not ignition presumably; at least, 35 degrees sounds way over advanced to me if it is.
Back to top
View user's profile Send private message
Rdover



Joined: 26 Nov 2007
Posts: 413

PostPosted: Thu May 10, 2012 6:49 pm    Post subject: Reply with quote

Yes. I have the car very close to ideal so by marking up the flywheel I can see what the current advance is and work from there.

Remember it is a 1912 side valve engine.
_________________
Richard
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.