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Post by davidc on Aug 2, 2009 18:58:00 GMT -5
Anyone ever do this? I recall hearing about it a few years ago and was going to try it. Have a nice new pair of plugs in the garage - think I'll give it a whirl. This, I believe, was put up by Ventura. Interesting! www.grandprixforums.net/side_gap.php
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Post by ventura on Aug 3, 2009 0:24:34 GMT -5
I've side gapped all the plugs in all the bikes I've had for a long time now. It really does make a positive difference. Split-fire plugs use exactly the same theory, but cost a LOT more!! That link posted is only one of many which have been published over the years. Chosen at random to answer the Q raised on TRN. Googling "side gapped plugs" will bring plenty similar results. V.
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Post by Blackston on Aug 3, 2009 2:24:56 GMT -5
That is really interesting guys...Me thinks I better have a go at that and see what improvements can be had....I have Iridium type and the resistance value is staggering!!!...Mmmm, definitely food for thought...
Thanks Guys,
Cheers,
Bret.....
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Post by Ghetto Fabulous MIKE Dogg on Aug 3, 2009 15:10:50 GMT -5
Split-fire plugs , side gap plugs what good are they?
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Post by davidc on Aug 3, 2009 15:54:14 GMT -5
Split-fire plugs , side gap plugs what good are they? Waste of time in your estimation, Mike?
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BluesRider
H.M.F.I.C.
A.K.A. CommandoRoadster Livin' the dream........
Posts: 2,765
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Post by BluesRider on Aug 19, 2009 19:21:17 GMT -5
I've been doing it for years.Read about it in Dirt Bike,back in the '70s.I've a thread somewhere on TRN about it. I can't say I've noticed a real difference on modern 4 strokes,but it makes a big difference on CDI pre-mix two strokes.Start easier,no more loading up,a lot less plug fouling.So that tells me it's doing something good. I'm not going to bother doing it on a V-8,but on a twin,it's cost free and quick.
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Post by rmak on Aug 20, 2009 20:55:30 GMT -5
Do you run those side gaps on your classic brit bikes, Bruce?
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Lake
Manx
Posts: 1,905
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Post by Lake on Aug 21, 2009 16:28:05 GMT -5
No experience of these but I do wonder; a spark is a spark and an ignition of a combustable gas/liquid will be the same regardless. If I were to detonate a bomb using a fuse I would hazard a guess that the effect would be the same regardless of the type of fuse (other than time taken of course) and by how alight it was. Anyway, surely any miniscule difference to the ignition of the fuel/air could be corrected by a miniscule timing adjustment?
Sorry, but I really cannot see how it can make any disconcernable (sic) difference other than perception.
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Post by davidc on Aug 21, 2009 17:07:49 GMT -5
A test! A controlled laboratory experiment is in order here! I nominate...I nominate...ummm...Old Scratcher - just as soon as those aborigines release him! [Hope they did not shrink his head ]
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BluesRider
H.M.F.I.C.
A.K.A. CommandoRoadster Livin' the dream........
Posts: 2,765
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Post by BluesRider on Aug 22, 2009 23:38:20 GMT -5
Do you run those side gaps on your classic brit bikes, Bruce? Yes,and on my Bimmer,and Harley,too.
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BluesRider
H.M.F.I.C.
A.K.A. CommandoRoadster Livin' the dream........
Posts: 2,765
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Post by BluesRider on Aug 23, 2009 0:17:13 GMT -5
Now,ya wanna really get wild? Index yer plugs!
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BluesRider
H.M.F.I.C.
A.K.A. CommandoRoadster Livin' the dream........
Posts: 2,765
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Post by BluesRider on Aug 23, 2009 0:20:30 GMT -5
Oops! Those are the same pix in Dave's link.
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Lake
Manx
Posts: 1,905
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Post by Lake on Aug 23, 2009 13:39:20 GMT -5
Now,ya wanna really get wild? Index yer plugs! Yeah but that's only fine when testing a spark in air. When it 'goes off' in a combustible mixture I cannot see that it will have any difference at all, i.e. Will it cause the fuel to ignite quicker? No. Will it cause the fuel to 'bang' more? No. Will it give more power? No. Looks good when tried in air though.
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gumpt1oo
Manx
For England and St George!
Posts: 1,318
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Post by gumpt1oo on Aug 23, 2009 13:40:51 GMT -5
INDEXING, Bruce, that takes me back to when I was racing many years ago. From memory we used to use varying thickness washers so that when tightened, the spark plug gap faced the inlet valve on 4 strokes, and the inlet port on 2 strokes, happy memories!
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BluesRider
H.M.F.I.C.
A.K.A. CommandoRoadster Livin' the dream........
Posts: 2,765
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Post by BluesRider on Aug 23, 2009 22:36:30 GMT -5
Yeah but that's only fine when testing a spark in air. When it 'goes off' in a combustible mixture I cannot see that it will have any difference at all, i.e. Will it cause the fuel to ignite quicker? No. Will it cause the fuel to 'bang' more? No. Will it give more power? No.
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