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Tony K

Indexing spark plugs?

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Does it make any sense to index the spark plugs on a DOHC engine where the plug is right in the middle of the combustion chamber? i.e. 907 . . .


Tony K. :)

 

Esprit S1s #355H & 454H

Esprit S2.2  #324J

1991 Esprit SE

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Tony- I considered this also, but decided against it for 2 reasons.

1- It is a "pent roof" (terminology ease) combustion chamber, so the issue of spark "access" to accomodate an asymetrical shape is kind of negated.

2- Indexing would require shimming, and having variances in the plug penetration (depth into CC) would be less predictable. Shimming to get equal penetration is great, and would be more vital (in my opinion) than the electrode/bar relationship. But............I am probably wrong.

Edited by Erzulis Boat

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We looked at this on the IRL engine but didn't see any gain so I don't think it's worth the hassle.


S4 Elan, Elan +2S, Federal-spec, World Championship Edition S2 Esprit #42, S1 Elise, Excel SE

 

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Thanks fellas. I won't bother. :(


Tony K. :)

 

Esprit S1s #355H & 454H

Esprit S2.2  #324J

1991 Esprit SE

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