Plugs B7ECS ?????

[mild2wild]

Hi,
I run B7ECS plugs in my Wedge, and I have noticed in other postings that they should be replaced at about 5000 miles. I have done nearly 15000 miles on them and they seem fine no misfires etc, why are 5000 miles suggested as the replacment time ?

[2 Sheds]

B7ECS are competition plugs designed to last 4-5,000 miles , i have always found that they need replacing regularly, it might be worth changing to see if it makes any difference, after all 15,000 is plenty of miles for any plug.

[mgv8]

Why are you runing race plugs on a roadcar?
How do they help?

[shpub]

They are not race plugs. They are plugs that happen to be used in TVRs because they help prevent pinking. Now standard fit in the TVR Rover V8 engines and have been for many many years.

Steve
www.tvrbooks.co.uk

[2 Sheds]

NGKB7ECS are competition plugs, the C stands for Competition, although technically not racing plugs they have been used in TVR's for many years and are recommended by many specialists, they are fine for road use, but don't last as long as others. at £3-50 each are not cheap, but like synthetic oil offer good value.

[shpub]

According to the NGK spark plug guide - an enthralling read on par with the latest bonkbuster with terms like long reach and grooved centres - the CS refers to the spark plug end construction code and nothing more. I believe it is a low angle ground electrode of 2,5 mm diameter....

I think I need to get out more...

Steve

[tvr350i]

Anybody tested platinum plugs ?

[danny hoffman]

My 350i has done about 11,000 miles on a set and when I checked them a 6,000 miles they still looked like new

Danny

[jellyed]

quote:
NGKB7ECS are competition plugs, the C stands for Competition, although technically not racing plugs they have been used in TVR's for many years and are recommended by many specialists, they are fine for road use, but don't last as long as others. at £3-50 each are not cheap, but like synthetic oil offer good value.

[jellyed]

B7ECS!!!!!!
£3.50????
Not up north lad!!!

[jellyed]

B7ECS!!!!
£3 50.
Not up north lad !!!

[2 Sheds]

quote:
B7ECS!!!!
£3 50.
Not up north lad !!!

Well not down south either Cocker! if you know where to get them ! £3-50 is the recommended retail north and south.

[tvr350i]

Since spark plugs are the subject i wonder if Steve has any thought about this: I got tired on the original ignition system with missing pulses and replaced it with a CDI (PRO10E) and a Crane PS92 coil. Gives a spark that reaches about 40mm (watch it!...) Pinking problems ? Noo... I´m using B7ECS sparks with a (maximum?) "bendable" gap of around 1.5mm, and 12 deg static advance at the moment. Question is if Steve has any ideas or experience regarding this matter.
- Experience in using hi voltage coils ?
- Any known spark plugs that can take a 2mm gap ?
- Anything wrong/bad except the cost...?

bengt

[wedg1e]

I seem to recall that when I measured the B7ECS's on my 390, they had some definite resistance, suggesting that they are suppressed plugs. The HT leads are also resistive, and I'm sure I remember reading in the dim and distant past that it's usual to fit EITHER resistive plugs OR resistive leads, but not both.
Now the HT leads vary in resistance according to length, anything from about 7K ohms to 15K ohms. The coil lead is another 15K, plus the resistance of the plugs which I forget. Add to that the air gaps at rotor arm and plugs and perhaps there's a recipe for misfires galore, even if the coil does manage to make a reliable 25kV into a varying load with each firing.
Anyone want to shoot me down in flames?

Ian

[danny hoffman]

Isn't the strenght of spark dependant on voltage, and this would be the same whatever the resistance (within reason)?

Danny

[qube]

Chucked my Ngk's out when i bought the car as it wasn't idling properly hunting up and down and swapped them for a set of Champion Eon's the car doesn't hunt with these and is smoother under acceleration.

[andymadmak]

Doing the plugs on my 400se this weekend.
Is it the general view that NGKB7ECS are the ones to fit, or is there anything better? (I have 8mm Magnecore leads fitted now, if that makes a difference)
Plus, what should I set the electrode gap to? (or is it factory preset?)

Cheers
Andy 400se

[MGv8]

I called RPi and they told me to use NGK's.
I called Real Steel and they told me to use NGK's.
Swoping plugs form old to new will not tell you wish is best.
"All plugs with raier metel plugs will do is make them last longer" Quote from NGK and this years NEC sports car show.

[andymadmak]

Thanks for that Simon.
Looks like it's going to be NGKs again then!

Cheers
Andy 400se

[dodger(rwalker1)]

danny hoffman said: Isn't the strenght of spark dependant on voltage, and this would be the same whatever the resistance (within reason)?

Danny

No. Because voltage (potential difference between the electrode and ground) will depend on the total resistance from h.v. coil terminal to the electrode.



>> Edited by dodger(rwalker1) on Wednesday 23 October 13:16