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Aug 24th, 2023
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Joined: Jul 2007
Posts: 28,416 Likes: 178
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,416 Likes: 178 |
Yes. 
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'09 Gen2 MINI Cooper ragtop
'90 LR 90 SW
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Joined: Sep 2014
Posts: 2,272 Likes: 7
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2014
Posts: 2,272 Likes: 7 |
I would have them all wrapped in neoprene ;-)) The judges or the spark plugs? The competitors!  I took that as a given.
Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
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Joined: May 2015
Posts: 110
L - Learner Plates On
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L - Learner Plates On
Joined: May 2015
Posts: 110 |
Indexed plugs are standard on Gen 1 Honda Insights, the spark plug hole is marked A, B or C and the plugs are similarly marked. Must brighten up the storeman's when someone comes in for a mixed set.
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Joined: May 2010
Posts: 9,285 Likes: 69
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,285 Likes: 69 |
Have a read of Graham Bells's book...Modern Engine Tuning.
He has a section on plugs. One suggestion is filing the neg electrode to a point as sparks jump to sharp corners, like a lightning conductor attracts lightning. Supposedly to give a better spark. He covers multi electrodes, precious metal (iridium etc), copper.
Nothing about indexing though. He also covers spark plug temperature selection.
A good book.
Plus Four MY23 Furka Rouge
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Joined: Dec 2008
Posts: 21,868 Likes: 167
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 21,868 Likes: 167 |
On my MGB, the amount of pinking was linked to the plug gap, and it would slowly get worse as the gap widened. Reducing the gap reduced the pinking. I assumed that this was because a wider gap means a slightly later spark in the cycle.
This was after setting the timing at the optimum setting, without feeling that the performance was dulled.
I don't see how sharpening the electrode will make much difference. The spark will jump to the easiest spot, although with a flat end I suppose that might move around.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jan 2012
Posts: 4,328
Gone to Porsche Part of the Furniture
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Gone to Porsche Part of the Furniture
Joined: Jan 2012
Posts: 4,328 |
The idea is to align the plug by using copper washers so that the spark area is centred Never heard of this, however i did have lady customer once who asked me to align all her wheel centre caps, she was Gobsmacked after i drove the car 100yds and then showeed her how they where out of synq......she just didnt get it. 
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Joined: Jul 2007
Posts: 28,416 Likes: 178
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,416 Likes: 178 |
Should have told her she needed a Roller for that to work!
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'09 Gen2 MINI Cooper ragtop
'90 LR 90 SW
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Joined: Jan 2009
Posts: 5,880 Likes: 20
Charter Member
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Charter Member
Joined: Jan 2009
Posts: 5,880 Likes: 20 |
This is a new idea to me but on the US Healey boys forum it seems common practice. The idea is to align the plug by using copper washers so that the spark area is centred in the cylinder and not facing the cylinder wall. Numbering the plugs once done, anyone had a go at this?
They also file the tip back to the edge of the electrode.. Did a Google and whilst I could find lots of references, I couldnt find anyone who had done a before and after dyno run.
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Joined: Oct 2012
Posts: 2,776 Likes: 59
Talk Morgan Expert
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Talk Morgan Expert
Joined: Oct 2012
Posts: 2,776 Likes: 59 |
Was involved with a race bike engine that kept blowing neat little holes in its piston crowns...turned out that the particular brand of spark plug that was being used in it projected about 1mm further into the combustion chamber than the nominally equivalent spark plugs usually used by the engine builder. Doubling up the sealing washers on the plugs was all it took to end a rather long, baffling and expensive series of engine blow ups.
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Joined: May 2014
Posts: 2,774
Talk Morgan Expert
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OP
Talk Morgan Expert
Joined: May 2014
Posts: 2,774 |
Was involved with a race bike engine that kept blowing neat little holes in its piston crowns...turned out that the particular brand of spark plug that was being used in it projected about 1mm further into the combustion chamber than the nominally equivalent spark plugs usually used by the engine builder. Doubling up the sealing washers on the plugs was all it took to end a rather long, baffling and expensive series of engine blow ups. Also seen a good few times where long reach plugs fitted where short reach should have been used. Some left in so long they caused problems when taking them out due to the burnt ends knackering the threads in alloy heads.
Steve
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