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Home > General Chat > How to work out what spark plugs to use.

Alex1340

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902 Posts
Member #: 111
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Loughborough

19th Feb, 2011 at 08:05:15pm

I've comming up to getting my mini back on the road in march and i've got a rolling road planned for april. In preperation for the session i need to give it a service and make sure i have the right plugs.
The engine spec is
NA 1380
stage 4 (36/31)
1.5:1 roll tip rocker
286 kent cam
omega pistons

trying to remmber the compression ratio... emm i can't

Any way the question is how do i pick which type of sparkplug to use to get the right heat for it??


Kean

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aka T2clubby

South Staffs

19th Feb, 2011 at 08:46:06pm

C/R is probably going to have the largest effect on it, but I would use a 6 and go from there depending how the rr goes.


stevieturbo

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Northern Ireland

19th Feb, 2011 at 08:48:02pm

going by NGK heat ranges...

8's would be too cold unless you have a very powerful ignition system.

6's or 7's would probably be safest bet. You dont mention boost ? so if n/a, 6's would be fine.
Cant really see any benefit of running a hotter plug, as 6's should have no fouling issues on a setup that runs fine

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Miniwilliams

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Proven 200+bhp & Avon Park 05,06,07 Class D 3rd place

19th Feb, 2011 at 09:38:36pm

Spot on with Steve. I used ngk 7s in my 1380 N/a and it was spot on.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

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mcalvert39

388 Posts
Member #: 442
Senior Member

Manchester

20th Feb, 2011 at 10:53:23am

What sort of ignition system are you using? Depending on which will mean using resistive plugs or not.

Edited by mcalvert39 on 20th Feb, 2011.


wil_h

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Betwix Harrogate and York

20th Feb, 2011 at 12:14:37pm

There is no reason to use a non-resistive plug.

I'd use 6s.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


nick1275

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Senior Member

Ferndown, Dorset

20th Feb, 2011 at 02:59:40pm

ive got 6's in a near identical spec engine

On 1st Mar, 2009 MikeRace said:
Hmmm weberyyy


On 21st Apr, 2009 madcatminis said:
I hope she's got knickers on or you'll have a funny runny mark on your bonnet. Quite like what a snail leaves behind.


Alex1340

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902 Posts
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Loughborough

20th Feb, 2011 at 10:08:02pm

Im using Megajolts with the ford coilpack.
I think compresion is 11:1 but i can't remmber.

Kean

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aka T2clubby

South Staffs

20th Feb, 2011 at 10:29:24pm

BPR6ES should do the trick

turbominivanman

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Westbury, Wiltshire

20th Feb, 2011 at 11:27:52pm

On 20th Feb, 2011 Kean said:
BPR6ES should do the trick


I agree with Kean. Good all-round plug, fine for your NA 1380 and if turbo go to BCR7ES.

Richard.

Minivanless, but reluctantly happy living with the decision. There'll be another one day.
http://www.youtube.com/profile?user=minimadmotorman#p/u

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