Spark Plug Wires

tlyoungb

Is this even possible what they are advertising here? More horsepower and better gas milage using these plug wires?

HIGH PERFORMANCE Thundervolt

Interesting

glider

Snake oil!

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Bud White

Snake oil for sure i would say .. I have never heard of wires claiming that .. Better conduction for better spark sure like accel says but this no

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Hobbit

Sorry guys/gals this one i can stop dead right now.
Thundervolt leads do EXACTLY as they say for once.
i had these on my metric they are incredible things as thick as my little finger combined with new coils which i needed anyway and stock plugs i saw - easier starting, better burn on the plugs = more mileage mute point when you have throttle pinned at WOT, and YES MORE HP, ok hold your breathe are you ready sitting down good, i saw 2.5hp from these leads alone - we dyno'd with them and with stock.

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glider

Could it have possibly been that they were new and the ones they replaced were in need of replacing? Often overlooked when doing a comparison.

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Hobbit

sorry forgot to mention the Stock leads were also new from Yamaha, i also looked at DYNA leads and Taylor all were more money.
Full engine build consisted of
Cams, rejet, DYNA ignition, Dyna Micro coils and Thundervolt leads, new plugs, 2-1 race pipe.
the reason i swapped the coils and already had new leads was that i had a miss fire and did the basics first plugs no change - new leads no change - bike then parked up waiting new coils the 2 dyna's were little more than price of 1 new Yam and came with the Thundervolts as a kit

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Hobbit

i am usually one of the 1st to shout Snake Oil but these do actually live up to the Hype for once

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smitty901

With the snake oil on this one.
If they helped any at all it was the bike had a problem befor you put them on

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glider

OK, let's analyze this one. The purpose of a plug wire is to deliver the voltage (spark) to the plug which in turn ignites the fuel mixture in the cylinder. Assuming there is nothing wrong with the plugs and/or wires on any given motor, how can a different wire or plug give you more horsepower out of the same setup.
If there was wear on the plugs or voltage leaks on the wires, then there would be a difference possibly seen with the new parts. Once a mixture is ignited it's all over there, this is on a stock motor and not on a MSD unit or race car. Also assuming the stock compression normally aspirated motor.

splain to me I wants ta learn!

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Hobbit

ok i will try my best.
we all know that a plug lead is designed to do one thing deliever the charge from the coil to the plug.
we also know that coils are rated for primary charge and secondary charge.
now for a little physics.
Electricity travels down a wire which has a given conductivity and resistance, copper being one of the best conductors known, the best is very very expensive and those with high end audio will know very very well, any back to the query.

If a coil is designed to deilver 20,000volts to the plug, there is a resistance from the stock wire of say 20% means you lose 4,000volts of spark, you then have leakage losses from the caps and coils of say 10% another 2,000volts meaning you only get 14,000volts of reduced efficincy to burn the atomised fuel air mixture, as you also lose ohms and amperage at the same rates meaning smaller bang.

now the same coil firing down a wire with less resistance and better insulation means more of the energy built up by the coil is getting to the spark tip meaning faster arc and a bigger bang resulting in a better burn in the combustion chamber meaning more power and better fuel economy.

it can then get all very complicated and big power engines having decked spark plugs so the spark opening is facing the incoming flame front to give even bigger burn.

the minus'es of doing this are you, will be even more throttle happy due to the faster response of the motor, meaning the economy you gained you have now lost you power hungery speed demon's and reduced plug life unless you upgrade to a plug that is rated to deal with the extra electric power you are now supplying it with.

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