Mark Gibson Posted July 22, 2013 Share Posted July 22, 2013 Hi. Just fitting new spark plugs in my Sigma 125 engined car for the first time. Picked up replacement AYFS22CB plugs from Ford today but wanted to know what the gaps should be. I have searched Blatchat and only found one very old comment that they should be 13thousands - not sure if this correct? I guess one option would be to measure the gaps in the ones I take out because the car was running sweetly before hand! Any help would be appreciated. Thanks, Mark Link to comment Share on other sites More sharing options...
Garth Posted July 22, 2013 Share Posted July 22, 2013 I would check what your existing ones are - if they have the 'code' written on the body you will be able to look up the gap they were supplied with - CC may do something different to the standard ford product? My sigma plugs have a 1mm gap, but not sure they are original plugs as I have had some work done on it! good luck Link to comment Share on other sites More sharing options...
diggerman Posted July 22, 2013 Share Posted July 22, 2013 New plugs should come with the right gap, provided they have not been dropped etc. I might be out of date but standard gaps always used to be 25 thou. Pete Link to comment Share on other sites More sharing options...
aerobod - near CYYC Posted July 23, 2013 Share Posted July 23, 2013 Typical plug gaps for fuel injected, electronic ignition cars are in the range of 0.7 to 1.3mm with 1mm being typical. That equates to 28 to 52 thou, 40 thou in the middle. Generally larger gaps in modern engines compared with older cars with points and condensers, allows for better flame propagation and more complete combustion. Link to comment Share on other sites More sharing options...
Mark Gibson Posted July 23, 2013 Author Share Posted July 23, 2013 Thanks All - very helpful. The plugs came from Ford with a gap of just over 1mm and this is identical to the gap in the ones currently in the car. Based on your comments this seems about right. Mark Link to comment Share on other sites More sharing options...
OliW Posted July 23, 2013 Share Posted July 23, 2013 Hi Mark, If it helps, I did not need to adjust mine when I bought them from Ford and it all seems to run perfectly well. Oli Link to comment Share on other sites More sharing options...
TobyCoulson Posted July 23, 2013 Share Posted July 23, 2013 As a matter of interest why are you replacing the plugs? Link to comment Share on other sites More sharing options...
Mark Durrant Posted July 23, 2013 Share Posted July 23, 2013 Quoting TobyCoulson: As a matter of interest why are you replacing the plugs? Toby He is a racer and hopes that a new set of plugs will improve his lap times by at least a second 😬 Edited by - Ray Snoates on 23 Jul 2013 13:17:24 Link to comment Share on other sites More sharing options...
Mark Gibson Posted July 26, 2013 Author Share Posted July 26, 2013 Toby - I bought the car (2008 academy car) in Dec 2012 and have now done 3 test days, 2 qualifying sessions, 4 races (well 3.1 races after my 2nd lap crash at Brands 😳), 2 curborough sprints and 1 trip to work!! Basically, I have no idea how long any of the bits have been on the car so thought it sensible to change them so I can then reset the clock.  As Ray says, brand new plugs got to be worth at least a second round Cadwell in September 😬 More importantly, my good lady wife should be competing in the car next at Curborough in August so everything must be perfect 🥰 Mark Link to comment Share on other sites More sharing options...
6speedmanual Posted July 26, 2013 Share Posted July 26, 2013 If everything must be perfect, I've set of new plug gaps in the garage. They are 1.0mm and can be fitted to new or used plugs. NTL donation appreciated. Cheap to post as they're quite light. Peter Link to comment Share on other sites More sharing options...
Mark Gibson Posted July 27, 2013 Author Share Posted July 27, 2013 I have the gap tool but thanks anyway Peter. Mark Link to comment Share on other sites More sharing options...
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