0 or 5k ohm Plug extenders?
Discussion
following on from Dave COG post about lead resistance, I thought I would check my plug extenders as sometimes the car doesn't feel it is running 100%.
Sure enough, most of them were around 5k ohms which was printed on the casing but one of them appeared to be open circuit or no measurable resistance. I had some spare from the last car and looking through those, there was a slightly different part number and no 5k ohm stamp on them.
I have changed what I assume is the dodgy extender and the car is running a lot smoother but I now have seven 5k ohms and one 0 ohms extender.
It is probably worth changing all of them but why the difference and which one is correct please? My current car has Red Magnacors put on by the last owner if that makes any difference?
Thanks in advance
Sure enough, most of them were around 5k ohms which was printed on the casing but one of them appeared to be open circuit or no measurable resistance. I had some spare from the last car and looking through those, there was a slightly different part number and no 5k ohm stamp on them.
I have changed what I assume is the dodgy extender and the car is running a lot smoother but I now have seven 5k ohms and one 0 ohms extender.
It is probably worth changing all of them but why the difference and which one is correct please? My current car has Red Magnacors put on by the last owner if that makes any difference?
Thanks in advance
The extenders are at best a necessary evil, ultimately they are (as the OP has discovered) a potential point of failure.
Not that it matters much it should also be pointed out that the extenders rated as the non-resister type actually exhibit a resistance of 300 Ohms, so about the same resistance as a 6' length of the extremely low resistance MSD Super Conductor HT lead.
Extender failure is indeed quite common, lets be 100% clear they are only there to ensure the ends of the HT leads don't get burnt, if TVR could have got away without fitting them I'm sure they would have (as demonstrated with the V8 Wedge models).
This engine was never designed to have extenders, they are only fitted to Chimaeras & Griffs because of the exhaust manifold design, here's Range Rover P38:
See, no extenders
Now that's understood lets look at how we can delete the pesky things:
1. Buy decent leads with plug ends that have good resistance to heat like these MSD Super Conductors
2. Buy a 6' roll of MSD Pro-Boot Guard
3. Cut the MSD Pro-Boot Guard roll into 10" lengths & fit over the plug ends, this image shows the Pro-Boot Guard part way on, when fully fitted it goes over & right up to the very end of the grey MSD plug end
4. Fit a DEI Titanium Protect-A-Boot over the whole lot with the steel ring inside the Protect-A-Boot at the plug end, only use DEI Titanium Protect-A-Boots, the cheaper woven fiberglass boots are not up to the job
5. Repeat steps 1-4 eight times
6. You can now crimp your coil/distributor ends, the MSD Super Conductor universal kit comes with two types of distributor ends and a basic but effective crimp die in the box. Details here:
http://www.circletrack.com/enginetech/ctrp_1106_do...
I've just gone through the above process and will be testing the effectiveness of the leads & my double wrapped plug end heat protection over the next few months.
Good or bad I'll make sure I let everyone know how it all works out
Dave.
Not that it matters much it should also be pointed out that the extenders rated as the non-resister type actually exhibit a resistance of 300 Ohms, so about the same resistance as a 6' length of the extremely low resistance MSD Super Conductor HT lead.
Extender failure is indeed quite common, lets be 100% clear they are only there to ensure the ends of the HT leads don't get burnt, if TVR could have got away without fitting them I'm sure they would have (as demonstrated with the V8 Wedge models).
This engine was never designed to have extenders, they are only fitted to Chimaeras & Griffs because of the exhaust manifold design, here's Range Rover P38:
See, no extenders
Now that's understood lets look at how we can delete the pesky things:
1. Buy decent leads with plug ends that have good resistance to heat like these MSD Super Conductors
2. Buy a 6' roll of MSD Pro-Boot Guard
3. Cut the MSD Pro-Boot Guard roll into 10" lengths & fit over the plug ends, this image shows the Pro-Boot Guard part way on, when fully fitted it goes over & right up to the very end of the grey MSD plug end
4. Fit a DEI Titanium Protect-A-Boot over the whole lot with the steel ring inside the Protect-A-Boot at the plug end, only use DEI Titanium Protect-A-Boots, the cheaper woven fiberglass boots are not up to the job
5. Repeat steps 1-4 eight times
6. You can now crimp your coil/distributor ends, the MSD Super Conductor universal kit comes with two types of distributor ends and a basic but effective crimp die in the box. Details here:
http://www.circletrack.com/enginetech/ctrp_1106_do...
I've just gone through the above process and will be testing the effectiveness of the leads & my double wrapped plug end heat protection over the next few months.
Good or bad I'll make sure I let everyone know how it all works out
Dave.
Edited by ChimpOnGas on Saturday 22 November 11:37
I realise that this is an old thread but it was linked to from a newer thread and this sort of seems an appropriate place for it...
Has anyone tried the Accel 9002C cable set? They have ceramic boots with 45/135 degree bends and might be ideal for the job ...
http://www.ebay.co.uk/itm/Accel-9002C-Universal-Ex...
... half tempted to order up a set but the $70/£50 postage is horrendous!
Phil
Has anyone tried the Accel 9002C cable set? They have ceramic boots with 45/135 degree bends and might be ideal for the job ...
http://www.ebay.co.uk/itm/Accel-9002C-Universal-Ex...
... half tempted to order up a set but the $70/£50 postage is horrendous!
Phil
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
try this link, i fitted these a few months back and they are working great.
try this link, i fitted these a few months back and they are working great.
NZ fan said:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
try this link, i fitted these a few months back and they are working great.
...so that would be a yes then.. try this link, i fitted these a few months back and they are working great.
How were they for length? I have coil packs mounted on the front of the block on a bracket - not on the side of the plenum - so they need a little more length than to a dizzy...
Phil
NZ fan said:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
try this link, i fitted these a few months back and they are working great.
I have a $20 Summit discount code if anyone can use it... purchase has to exceed $100 , I see those leads are $99.97 try this link, i fitted these a few months back and they are working great.
phillpot said:
NZ fan said:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
try this link, i fitted these a few months back and they are working great.
I have a $20 Summit discount code if anyone can use it... purchase has to exceed $100 , I see those leads are $99.97 try this link, i fitted these a few months back and they are working great.
Phil
I got the voucher from buying some rubber rocker cover gaskets they were clearing at a very good price. Postage (guess it includes import duty?) was "killing it" so a quick ask on the S forum came up with a fellow S owner who had a relative in the States coming to the UK for Christmas, sorted
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