29 replies to this topic

[liirge]

For a 1380 with carburettor and 276 cam wich spark plug is the best?
Thanks

What's the compression ratio?

[samsfern]

id use ngk bp7es, simple.

[minifan333]

For a 1380 with carburettor and 276 cam wich spark plug is the best?
Thanks

What's the compression ratio?

I don't know :|
Is the 1380 stage3 from jonspeed.

[liirge]

hmm, well its all to do with the compression ratio. if using the colder BP7's you run the risk of wetting them with the carburettor on start up and idle. I personally think I would go for the warmer BP6 if being used as a daily driver.

[Tinkerbelle]

I have run BPR6E on my 1310 with 9.8 c/r and a Megajolt system. These have been fine, but need to be replaced. What is the difference between these and the BPR6ES?

Matt

[liirge]

The difference is that you should be using the BPR6ES! The R stands for resistor and this is a requirement when using electric ignition systems like Megajolt! you will probably find that when you swap them over you won't have to change them as often

[Tinkerbelle]

Thanks, but I know about the resistive bit. The ones I have been using are! I would like to know what the S at the end means?

Matt

[liirge]

ahhh so you are i completely read that incorrectly!

Perhaps the BP6E is an older code, as the S, just means standard copper core. From the data I have at my disposal indicates they didn't make a plug without any reference to the firing end construction (the last letter)

[liirge]

Looking further it means it is old packaging!

[jonny f]

The difference is that you should be using the BPR6ES! The R stands for resistor and this is a requirement when using electric ignition systems like Megajolt! you will probably find that when you swap them over you won't have to change them as often

Sorry to dig this old topic up.

When talking electronic ignition, you mean anything other than points?

Edited by jonny f, 01 March 2013 - 07:33 PM.

[Dusky]

Sorry to bring this up, but what heat range should I get on my 1330?

 

1330, 35X29mm valves, 643 camshaft, compression around 10.5:1

 

I've used brisk multispark plugs for the last 200 km without problems, but that is on running in, so I haven't given it real beans.

The heatrange of these plugs is the same as a NGK 6. But I must say they are a bit tucked away in the spark plug hole, so I guess they'll be a tad cooler? ( less flame exposure?)

 

 

Glad to hear any advice!

[nicklouse]

Give them a good run and see.

[Dusky]

Give them a good run and see.

Could a plug break after a good run? Or melt?
Don't mind buying new plugs, but don't want to damage the engine :>

[nicklouse]

Yes and no.

You could if you did a long race on the wrong plugs.


I used to have warm up plugs and race plugs. Left the warm up plugs in once and they were fine for a balls out drag run.

Think they were 5s when I normally ran 8s or 9s.

Go for a blast and have a look.

[Mrpeanut]

My 1330 loved the BPR6ET plug. Brilliant things.