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Spark plugs for stock M10 with MS controlled EDIS


jjd02

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I'm putting together parts to convert a '74 to EFI, but I'm not sure what to do about spark plugs. It seems, with a totally different spark producing system, that maybe I should use different plugs. I have an MS-II V3.57 ECU that will be controlling a stock EDIS-4 setup made up mostly of parts I sourced from Tom at 02again. I think those are the important bits of info. What plugs are you megasquirted 02ers running? Does anyone know what plugs and gap work best on a stock M10 with EDIS?

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What engine characteristics determine the plug to be used anyway? And the gap?

The stock plug gap for the ford escort which the EDIS system comes from is either .045 or .05. That is why I used it as a start point. The EDIS system easily throws spark that far on my motor even with 9.5:1 pistons.

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  • 3 months later...

NGK BPR5ES .045 gap here as well. Just use the cheapest BPR5es plugs they have... no point in iridium or anything like that.

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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BP5ES. I dont remember what I have mine gapped at. I'm running a carb though. 

-Nathan
'76 2002 in Malaga (110k Original, 2nd Owner, sat for 20 years and now a toy)
'86 Chevy K20 (6.2 Turbo Diesel build) & '46 Chevy 2 Ton Dump Truck
'74 Suzuki TS185, '68 BSA A65 Lightning (garage find), '74 BMW R90S US Spec #2

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BP5ES. I dont remember what I have mine gapped at. I'm running a carb though. 

 

Run resistor plugs or reistor caps, if you have neither you will get interference with the EFI

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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Run resistor plugs or reistor caps, if you have neither you will get interference with the EFI

 

That is not correct.  If you system is well wired and grounded, you can easily run non-resistor plugs.

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That is not correct.  If you system is well wired and grounded, you can easily run non-resistor plugs.

 

A well wired and properly grounded system is only half the job. When you have over 15,000 volts of electricity pulsing at over 2000x per second (using conservative numbers here, since edis is wasted spark it can be as much as 4000x per second and well over 20,000 volts) their is bound to be a good bit of Electromagnetic Interference flying around. Properly shielded sensor and PIP/SAW wires helps to get around much of this interference;- hence why non-resistor plugs will "work" but the difference in price is negligible and not recognizing interference does not mean it is not present. Also, it cuts down on radio interference if you listen to a radio. 

 

Also, my original statement was that "you will get interference with the EFI if you don't run a resistor in either the plug or the plug leads", not "your car won't run on non-resistor plugs". Just because it works does not mean it is built properly or as well as it should be. 

1974 Grey European Market BMW 2002 

1976 Yellow BMW 2002 "GOLDENROD" SOLD

1972 Yellow Austin Mini 1000

A bunch of Bikes...

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Throwin this out there. I get negligible amounts of radio interference right now with no resistors in my rotor, plugs, or wires. But I will definitely toss some R plugs in there when I do the MS in a year or so 

-Nathan
'76 2002 in Malaga (110k Original, 2nd Owner, sat for 20 years and now a toy)
'86 Chevy K20 (6.2 Turbo Diesel build) & '46 Chevy 2 Ton Dump Truck
'74 Suzuki TS185, '68 BSA A65 Lightning (garage find), '74 BMW R90S US Spec #2

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