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Mine wasn't misbehaving like yours, but...
Posted by BillJ (more from BillJ) on Thu, 11 Jul 2002 12:00:31
In Reply to: 1.1mm is what I gapped mine at, paulmanchester, Thu, 11 Jul 2002 09:29:41
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... I found that brand new plugs gapped to 0.9mm didn't give the responsiveness that plugs gapped at 1.1mm give. The responsiveness of the car is largely down to how well it runs when off-boost (determining how quickly boost comes on). This is also one reason Saab's APC system helped driveability - the compression ratio could be a lot higher than on more primitive turbo engines, which again allows the engine to produce more power when off-boost.
I think the plug gap is a compromise between a big enough spark to light the mixture effectively when off-boost and a small enough gap for the spark to jump across under full boost without overstressing the DI cassette.
posted by 62.253....
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