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3.3 short stroke, what plug heat range?
I am about to start a rebuild on a 3.0 block using 100mm pistons and cylinders. The pistons are Mahle cast to give 10.1:1 compression ratio. Cams will be from a 964 and I have an Electromotive XDi ignition to provide spark. I will be using ported Carrera heads that have been twin plugged. I need some input as to what brand and heat range spark plugs to use. The heads are cut for 12mm plugs. It's probably appropriate that it is nearly Halloween since I am "lost as a haint" as to which plugs to use! Total advance will most likely be in the 22-24 degree range.
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What induction, fuel injection or carbs?
I use NGK 7 or 8 on my carbed 3.2 short stroke, as does a buddy with a 3.3L SS For Bosch comparison I have a bunch of spare/takeoff old spark plugs that came out of the engine before I bought it and they are coincidentally 7 heat range. But the Bosch and NGK range is opposite. Just so happens that The NGK 6 and the Bosch 7 are in the range where the same heat range for each plug coincide. |
Intake.........
Quote:
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Fred,
I'd use Bosch BPR7EIX (14mm) on top & XR4-CS (12mm) on the bottom. |
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