MikeCapon
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| posted on 9/10/08 at 06:40 AM |
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Uprating coil on plug ignition
A bit OT I know but as ever I'm trying to help out someone else. The engine in question is a 2006 1000 GSXR. Fitted with uprated cams, pistons,
flowed head, Yoshimura programmable ignition/injection.
There has been some doubt over the standard coil on plug system's capacity to provide healthy enough sparks, given the higher revs and
compression. Tests using a Magneti Marelli ignition have proved that a better spark can liberate more power. Unfortunately the Marelli system is, one
not cheap, two not ours and three it does not have a lot of the features that the Suzuki/Yoshimura system has got.
The question therefore is, does anyone know of a means of uprating the coils in a coil on plug ignition? Maybe there is another coil on plug pack
which we could fit? How to choose? I know that there are a lot of clever sparky people that get on here. Can you help please.
Here's a pic of the beast. It's just a BEC with one wheel missing really
[img][/img]
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britishtrident
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| posted on 9/10/08 at 07:10 AM |
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What spark plug gap is specified for the standard system ? ---- often the problem with plug top coils is the spark flashing over either inside the
pack coil or over the spark plug insulator. Part of the problem is once flashover has occured the plug lead insulator of the coil pack becomes
carbonised and more prone to flashover in the future.
In recent years mainly for emmision reasons manufacturers have tended to specify much wider plug gaps which puts a much greater stress on the
insulation ignitions system often reducing the plug gap to a more tradditional narrower gap such as 0.65 or 0.8 mm will give a more dependable
spark.
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MikeCapon
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| posted on 9/10/08 at 07:43 AM |
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Thanks for your reply.
The plugs being used at the moment are the standard plug for this motor (NGK CR9E) with a gap of 0.6-0.7mm. Any larger and the motor begins to be
reluctant to start and runs poorly.
Running race plugs (those with just a centre electrode and no ground electrode) is impossible.
The aim is to improve the ignition/spark and permit the use of the race type plug.
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MikeCapon
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| posted on 9/10/08 at 04:50 PM |
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Anybody?
We are considering running 4 conventional type coils with an improved primary/secondary winding ratio. Anyone got any thoughts on that?
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