Reply With QuoteI prefer to just tighten them up to spec and get on with life. They work just fine. If you are worried about orientation get some side-gap plugs with multiple electrodes.
Master
I have to be honest and say I only just heard about this and have not read about it on this site. Either my house is actually a rock or this is not common knowledge.
So anyway the story is you point the open part of the plug towards one of three similar places, a) the valves, b) slighlty towards the exhaust valve or c) you read the plugs by the burn patterns on it and each plug is sligtly different.
I think option c is the best but also the hardest. I think I will try just putting mine towards the valves. I think I have good enough ecomony records to see if it makes a difference.
Would like to know any more from others.
AT REST
I prefer to just tighten them up to spec and get on with life. They work just fine. If you are worried about orientation get some side-gap plugs with multiple electrodes.
Master
thank be utey, the reason I think its a good idea is because its very simple and free to do, and its claimed benefit is 1-2% better economy, and although this is not much, it also translates into better economy. People go to expensive lengths to get that 5% more, but for free you can get 1%.Originally Posted by bee utey
Also I think indexing the plugs still gives better performance than the milti electrode ones.
ForumSage
If you can reliably measure a 1% improvement in real world fuel economy I will give you a free skippy badge!
Major part of the heart and soul of AULRO.comOn a tank of LPG, that 1% would give me an extra 2.5km!If you can reliably measure a 1% improvement in real world fuel economy I will give you a free skippy badge!
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I only ever bothered doing it on race engines, and it's debatable if it even does anything as I never dyno tested before/after.
Hang on, I tell a fib, I did do it in my 351C running on LPG that was taken off the road twelve years ago and I still do it in my chainsaws
Master
you have some real world experiance which is good. I have no experiance with it, but the one point I need to reiterate here is that its free to do, no one is flogging anything, you were going to change the plugs anyway, just do it differently, and given the vast types of engines out there, it probably does work but very differently and by different amounts.
I only ever bothered doing it on race engines, and it's debatable if it even does anything as I never dyno tested before/after.
Hang on, I tell a fib, I did do it in my 351C running on LPG that was taken off the road twelve years ago and I still do it in my chainsaws
Moderator
I actually had indexing washers too, copper sparkplug washers (taper seat and flat) in slightly different thicknesses.
RoverLord
it can make a difference in small engines that rev hard like 2 strokes...
in a rover V8 when you can just get multi gap plugs....
Dave
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Wizard
SubscriberProbably not worth the effort except in race engines. This is where 1 or 2 HP can be the diffence between winning & losing.
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