I wouldn't say that the spark plugs are positioned perfectly symmetrical at all. Each chamber is a mirror of the one next to it, so position of the spark plug (in relation to exhaust/intake valves) take on opposite positions in relation to the mixture motion (the SINGLE MOST important fact behind spark plug placement (IMO). IF I was going to fire the spark plugs in a "single spark per pot" layout, I would use the 1 front, 2 Rear, 3 Front, 4 Rear as these are the ones that suit the port turn (again in my limited opinion). The second plug is not fired several degrees later, they are fired simultaneously, and as pointed out by Toyman, the spark is not controlled by the ECU (the advance weights and vacuum canister are a dead give away).Originally Posted by kojab
I found no difference in detonation threshold by switching the spark plugs off either. Having two spark plugs in the one hole effectively gives you double the spark energy, and potentially cleaner emissions are achived by giving a more complete burn throughout the combustion space.
Now to the GW's problem - RMS is right and so too TRRRunner. The combustion has leaked passed the gasket and pushed the water out. This is almost certainly due to detonation.
On the path to possible solutions, do not use that dyno tuner again and when putting it back together; use head studs, hylomar, O rings - all used in conjunction with each other is good. This will give some tolerance to poor tuning (detonation) BUT you cannot insure against idiots. Fcuked tuning will either break things, or give shit performance or both - everytime, no exceptions.
Sorry to hear of your predicament.
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