I went to repco today to get some sparkplugs for my cluby and wanted to get some NGK BP6ES, i was was told these are better than the champions that i used to use and have used them once before.

Anyway the lad at Repco said i should use NGK BP5ES because they are a hotter sparkplug and work better with the lower quality fuels available today than was available back when they were made. I went with the BP5ES

I want to know which is better, and whether what he was saying about hotter plug better for todays fuel is correct.

Is it possible that i can go to a TOO HOT sparkplug they may melt my pistons??

Thanks Brenton

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The info you got there is correct, unleaded fuel burns better and fouls plugs less with a plug 1 range hotter.
When GR dynoed my 1412 stroker at Xmas, it gave more torque and HP with BP5ES plugs than BP6ES.
I saw this same recommendation on a website too, I can't remember if it was BP, or Bosch (plugs).

You won't melt pistons in normal driving with BP5ES.
Note that for track work you would continue to use cold plugs- BP7ES at least, and colder ones if it's a race car.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

hey thanks Doc, my worries are settled.

Is it possible for me to go to a "tooo hot" a plug that can foul my motor.
Its a standard 998 with stardard 202 head extractors and standard 1 1/2 carb and filter?

Brenton

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I would stick with BP5ES.
Or for Champion, N11YC or N12YC.
For Bosch, W8DC.
These are all 1 heat range hotter than stock.

Cold heat range plugs tend to foul, not hot ones- that's why for racing cars it used to be common (is it still?) to warm the car up with stock plugs then put the race ones in.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

The Doc's spot on as usual, I had trouble with BP6ES plugs fouling in my warm 1152 roadie running BP Ultimate. Switched to the 5's and they're perfect

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Simon

The adventures of an owner builder in the Tallarook Ranges

Yeah thats what I have, work a treat.
Ive been told from a performance place that it can be benificial to even go one hotter, BP4ES.
Anyone had any experience with these?

What spark plugs should i use if i have a Mk1 G13B gti engine, Mk1 Head?

are these ok?



Usually how much HP or torque sees increasing for a good set of spark plugs?

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1964 Morris Mini 850 - G13b gti powered - classic yet practical
1968 Morris Minimatic - 1100cc - classic & breakable
Sun Certified Java Programmer v5 310-055

When i went to repco the guy gave me BP6RES spark plugs. Will these be good for a 998 +.60"?

BPR6ES are the same heat range as a BP6ES, but have a resistor built in, for use with electronic ignition.
They will probably work OK, but as I've had problems with resistor plugs in my boat I'm not a fan of them.

BP5ES would be better... IMO.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Heaps Doc and others - very much appreciated. I know what is best to use now

Cheers Brenton

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Hey, there's a thought. Would "electronic ignition" include the 123 distributor? I never bothered to change the coil either when I installed that, and it doesn't appear to have hurt any...

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Simon

The adventures of an owner builder in the Tallarook Ranges

The reason for the resistor in these plugs is to eliminate RF interference that can affect ECUs etc.
They take more grunt to fire properly though, modern cars that run them generally have more voltage available from CDI etc.
If running them with old suppression type plug leads you may find too much resistance in the system.

A 123 dizzy (like a Pertronix 1) will run OK with the stock coil, it is electronic, but not a CDI system.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

im with the doc on this one,my wifes stocker 1330 would always run on when turned off,spied docs blab on spark plugs and decided to run bp5s,to this day her car never runs on,thankyou doc,today bought same plugs for my 1152,and guess what,she dont run on either.dr mini your spot on,oh by the way your substacks make a huge differance to my car,cheers andy

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First you get the money,then you get the power,then you get the Mini.

will the hotter/colder plugs change the a/f mixture needed? I had to change my plugs from bp6es because I broke one and found bosch w8dc in my other motor and the plugs have gone black and the bp6es were a dark brown


:EDIT Fixed mistakes

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Up untill recently i had been using BP6ES and BP5ES and had been getting 1 or 2 "dead" ones in the pack or run the car turn it off, let it sit for a while, start it again and it would have a miss fire (didnt matter if the engine was well used or freshly rebuilt), so have changed to BP6EY & BP5EY and am yet to have any of the same problems with these spark plugs.

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http://www.youtube.com/watch?v=nDMkVq1jRGU