Replacement HTE Leads

[marleyrules]

Morning chaps,

I'm hoping to give my MK2 2.0 NA engine bay a new lease of life, and among other things want to replace the HTE Leads.

Are there any recommendations for a good replacement? The child in me wants them to be coloured.

[marleyrules]

Apologies also Rev2

[peteV6R5]

oem are best

[TonyleFrog]

https://mr2-ben.co.uk/categories/47

A decent spark is more important than fancy colours.

As said above the OEM Toyota ones are best but they are not cheap.
I got a s/h set for T2 years ago to replace the c**p Magnecors.
They are still on the car.
Resistance was still well within spec when tested last year.

[marleyrules]

Thanks for the info, i'm fairly certain i've put MR2-ben's kids through University the amount i've bought over the last few months.

I've read a couple of reviews and these seem to be highly regarded, any thoughts?
https://www.fensport.co.uk/parts/toyota ... -lead-kit/

[peteV6R5]

Thanks for the info, i'm fairly certain i've put MR2-ben's kids through University the amount i've bought over the last few months.

I've read a couple of reviews and these seem to be highly regarded, any thoughts?
https://www.fensport.co.uk/parts/toyota ... -lead-kit/

Magnecor KV85 have been known to fail quickly in the past. quite a few threads over the years on them. may be very good now but I personally wouldnt on past history

[TonyleFrog]

Magnecor KV85 have been known to fail quickly in the past. quite a few threads over the years on them. may be very good now but I personally wouldnt on past history

+1 - I think he needs to read my previous post again...

The purpose of 'competition spec' and 'aerospace' in advertising for aftermarket parts is frequently designed to make punters think 'oooh it must be good' and persuade them to pay more.

What many people forget is that for competition cars the budget will allow for immediate replacement of any part which fails or is less than optimum. The primary criterion is not longevity. The very opposite of a road car which has to function reliably over extended mileages and in all weather conditions.

T2 had Magnecors KV85s when I bought it. I know that they had been fitted less than two years previously.
A mere 3 years into my ownership the first signs of problems began. Eventually traced to a poor lead/plug cap interface. A design/QC failure imo. The car has been on OEM leads for nearly 7 years now. No issues whatsoever.

[MR2DI4]

The stock OEM leads on a NA are going to last a very long time.

The leads on a turbo not so much, its much harder on them under boost and when you get to 16-17psi the old ones develop pin holes that the spark jumps through down in the plug wells as the insulation fails.

One of mine failed instantly the first test drive after increasing the boost, otherwise on stock boost they would probably still be working today after nearly 30 years.

[jimi]

OK I'm interested, how does having forced induction increase the load on the plug leads ?

[marleyrules]

Cheers again for the info, read and understood the OEM preference It's just hard to believe there isn't a reliable upgrade set available - but why fix what doesn't need fixing I suppose.

OEM it is!

[MR2DI4]

OK I'm interested, how does having forced induction increase the load on the plug leads ?

Much higher peak Voltages required to jump the spark plug gap as the pressure increases in the cylinder.

Even with the insulation failure down inside the plug well, the car continued to run normally until the boost hit 5 or 6 psi at which point it was easier for the spark to jump across the plug well than jump across the spark gap, it was like hitting boost cut when you loose 1 cylinder on the 3SGTE.

Was hard to diagnose the problem but put in a whole set of OEM leads and the problem was suddenly gone.

On very close inspection of one of the leads there was like a discharge ring around the failure point where it had punched through the old insulation.

This is where fine wire electrodes and reduced plug gaps start to play a part, they reduce the extra high Voltage required to fire in high compression engines and put less stress on your HT leads.

The increase in Voltage required is just physics.

[SonicSW20]

T2 had Magnecors KV85s when I bought it. I know that they had been fitted less than two years previously.
A mere 3 years into my ownership the first signs of problems began. Eventually traced to a poor lead/plug cap interface. A design/QC failure imo. The car has been on OEM leads for nearly 7 years now. No issues whatsoever.

Over 90k miles on the NA with KV85's, and ~60-70k miles on an unknown age set that came with my previous NA. Only issue on the 2nd set was a split boot on the distributor end which I only found on removal after engine conversion, which Magnecor replaced FOC.

[jimi]

My car had 8mm Magnecor leads already fitted when I bought it in 2004, still running the same set and never had a bit of bother with them. They are popular with MK1 owners, can't remember seeing any reports of problems with them on MK1'S.