thingy connecting spark plug to HT lead
Discussion
andy43 said:
Cavalier/Astra 92-ish. Main Vauxhall dealer price is £7-8 from memory - better off with ACT ones
blimey - thats a first. No disrespect to ACT or any other suppliers but cant remember the last time a part cost less when it was bespoke TVR as against the cost if its taken from a mass produced car. Will get onto Tim
sanjay kohli said:
Over the weekend the speedometer on my Chimeara 500 stopped working. Is this likely to be a painstaking (and therefore expensive) job to repair?
That's one hell of a thread hikack?!
Possibly just a broken, shorted or misaligned sensor. Could be a broken speedo (does the odometer work).
Ian A.
griffter said:
And you'll need all 8 because the oe Vauxhall ones are resistive - 5k ohms. The ACT ones aren't.
How's that work then. I tried removing all of mine, trying to cure bad running problem and there was an improvement but also a smell of warm rubber. I assumed this was because I had removed the 5kohm resistance and the leads were getting warm (No leads were not touching the exhaust!). Surely removing this resistance will draw more current from the coil - causing it to fail? Although Range Rovers don't use them?!?!*!
Matt
taylormj4 said:
And you'll need all 8 because the oe Vauxhall ones are resistive - 5k ohms. The ACT ones aren't.
How's that work then. I tried removing all of mine, trying to cure bad running problem and there was an improvement but also a smell of warm rubber. I assumed this was because I had removed the 5kohm resistance and the leads were getting warm (No leads were not touching the exhaust!). Surely removing this resistance will draw more current from the coil - causing it to fail? Although Range Rovers don't use them?!?!*!
Matt
We can supply both resisted and non resisted, general opinion from the people that know is that non resisted are the best.
Never fit the leads directly to the plugs on a Griff or Chimaera, they will slowly burn.
Tim
Matt - Current is virtually non-existant in Ignition systems, its the Kilo volts (1000's of volts)that do the work, the current is in micro amps. So I doubt 5Kohms will have much impact and certainly won't make warmer leads - the heating is likely after removing the extenders ?? The resistance is there to help surpress some of the higher voltages which can be attributable to interference on radios etc.
Tim, Why do they slowly burn ?? I don't have extenders and neither have any of my "other" V8 engined cars ?? Is it for the same reason as above, the extenders insulate the leads ?? (cause it aint anything to do with resistance - as I said above) ??
Trev McM
Tim, Why do they slowly burn ?? I don't have extenders and neither have any of my "other" V8 engined cars ?? Is it for the same reason as above, the extenders insulate the leads ?? (cause it aint anything to do with resistance - as I said above) ??
Trev McM[/quote]
The plug boot (sheath that pushes over the plug) will be exposed to higher temperature than rubber is rated at, i guess my comment " slowly burn" is misleading they could blister very quickly, thoughs manifolds are very close and can run red hot.
Tim
Dontknowmuch,
I just replaced mine (plug shrouds) with the ones from ACT.
I was fiddling around and wanted to take out a spark plug (about the extent of my mechanical know how) and I couldn't get the shroud off for love nor money, so I put a screwdriver behind it to lever it off (not realising the top bit is made of ceramic!) and it shattered - oh bugger! So I bought 8 new ones from ACT, which don't have that ceramic bit on and they went on nice and easy!
I did manage to get the shrouds off eventually, by attaching mole grips to the nipple on the plug shroud and then levering against the grips.
To cut a long story short, I've got 7 shrouds, which have seen better days, but worked fine, not wishing to take any business away from ACT (cause I think they are great guys!) but if you want 1 of my old shrouds, I'll send one to you (I've got no real use for them now!)
Drop me an e-mail if you want one!
I just replaced mine (plug shrouds) with the ones from ACT.
I was fiddling around and wanted to take out a spark plug (about the extent of my mechanical know how) and I couldn't get the shroud off for love nor money, so I put a screwdriver behind it to lever it off (not realising the top bit is made of ceramic!) and it shattered - oh bugger! So I bought 8 new ones from ACT, which don't have that ceramic bit on and they went on nice and easy!
I did manage to get the shrouds off eventually, by attaching mole grips to the nipple on the plug shroud and then levering against the grips.
To cut a long story short, I've got 7 shrouds, which have seen better days, but worked fine, not wishing to take any business away from ACT (cause I think they are great guys!) but if you want 1 of my old shrouds, I'll send one to you (I've got no real use for them now!)
Drop me an e-mail if you want one!
k4trv said:
Matt - Current is virtually non-existant in Ignition systems, its the Kilo volts (1000's of volts)that do the work, the current is in micro amps. So I doubt 5Kohms will have much impact and certainly won't make warmer leads - the heating is likely after removing the extenders ?? The resistance is there to help surpress some of the higher voltages which can be attributable to interference on radios etc.
Tim, Why do they slowly burn ?? I don't have extenders and neither have any of my "other" V8 engined cars ?? Is it for the same reason as above, the extenders insulate the leads ?? (cause it aint anything to do with resistance - as I said above) ??
Trev McM
Yeah, Kilovolts is the stuff! I'm a electrical engineer in the power industry, much better than micro-amps etc!
You've got to have some resistance though I think or you'll just short out the coil so much that the voltage will collapse - presumably some resistance is provided by the coil internal resistance though.
Resistance does have a lot to do with it though surely. Voltage will be dropped across the 5kohm resistors, so at the instance of plug flash over there will be less voltage across the gap with the resistors compared to without them - translates to weaker spark?
Matt
If you've got resistive plugs (probably - especially if there's an 'R' in the code) and resistive leads (again, probably - I think all carbon/graphite leads are), you should be fine with non-resistive extenders. And there's the small matter of 0.8mm or so of spark plug gap providing (initial) resistance - 5k ohms pales in comparison really.
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