BP 7ES BPR 7ES

[eric]

BPR 7 ES R for resistance

 

BPR 7ES seems to replace BP 7ES

 

Could I use in a 1600 Sprint engine 110 HP

 

BP 6 ES avalaible, but too warm ?

[Kevsta]

I would think that as long as you go for the same temp rating (6 7 etc.) then the R version will not make any difference. I think they are mainly for modern engines that could pick up noise from the plugs and so they are more expensive to prevent this. In your car it is not necessary but if you can only get the R then it will just cost you a couple of quid more. I only remember this from when I had a x-flow.

 

 

[Graham Sewell]

Burton Power (here) have BP7ES (part number NGKBP7ES) listed at £2.39 each (inc VAT but excl P&P).

 

 

 

Cheers,

 

Graham

---

Low tech luddite - xflow and proud!

 

Edited by - Graham Sewell on 31 Oct 2007 14:41:15

[elie boone]

I use BCPR7ES in a Sprint X-flow, did 200mls on a track day at Spa last sunday and another trackday at Croix and it's still running fine.

 

The advantage from those plugs ( same as a K series ) is that the plug head is smaller and so more easy to get dirt from arround the plug head before remouving.

[j passfield]

I have just re-read a technical publication from NGK, R type plugs have a 5k resistor fitted to suppress noise during sparking, this prevents interference on car radio reception, mobile phone and two way radio operation, it also prevents the noise from interfering with a cars' ECU. Does not effect performance or cold starting so don't hesitatein using them.

[Graham Sewell]

iirc, the design of the plugs is such that the nose of the bp7es extends enough to get some cooling from the swirling inlet gases at higher speed, but the core stays hot enough not to foul at lower speeds.

 

The crossflow is, thankfully, tolerant to a large number of plug variants - so BCPR7ES (with copper core and resistance) works as well as the cheaper BP7ES.

 

If you cannot find any NGK plugs to suit then any of the Champion N9Y plugs will work just as well on a 100 sprint.

 

Cheers,

 

Graham

---

Low tech luddite - xflow and proud!

[eric]

the 7 sprint is a 110 HP version ( A2 cam)

 

During is race life; it was used Champion spark plug but the N6YCC (CC for cooper core which is a competition spark plug)

 

But personnally I find the NGK give a smoother engine noise

a less harsh sensation

[eric]

I see on Burton site that BP6ES are less prone to fouling

 

I will try them

[eric]

I saw on archive that Graham used in the past

BP6 ES

 

Of course I will try also BPR 7ES

 

Time for testing is just come

 

 

[Graham Sewell]

The Champion N6YCC is a very cold plug for a crossflow, but would be suitable for racing. The NGK equivalent (according to sparkplug.co.uk is BP8ES which is two grades cooler that the standard recommendation for the 1600sprint. As such it is likely to foul up during road use.

[eric]

So I will try BP 6ES (You are happy with them ?)

and N7YCC

[eric]

BPR7ES seems to replace BP7ES

 

BP6ES seems to better than BP7ES in winter and for road

 

 

[Alex Wong1697456877]

But personnally I find the NGK give a smoother engine noise

 

Agree - on my old Vx engine, with NGKs, it was noticably smoother than with champion plugs.

[eric]

Saturday I will go to a track day

 

I 'll stay with the BP6ES (next model avalaible from NGK will be BPR6ES with a resistor for radio and mobile phone purpose)

I will test them and I shall bring a set of BP7ES in case BP6ES would be to warm

 

I will keep you inform

 

The temperature is now cold in the morning around 8 -10°

15° - 17° in the afternoon

 

The first thinking : less unburned fuel and then less cough and boom in the webers and exhaust

[elie boone]

Eric, put NGK 7's in and enjoy the track day, thats what i run with and it behaves & perfoms perfectly.