Best Spark Plugs

[HOT_ROD_CAR]

What spark plug would be the best for a 1970 351 Cleveland with an 50,000 volt coil/HEI distributor, 650 cfm Holley/Edlebrock dual plane with open chamber 2V heads?

 

[DeanMLFlame]

i'd say Bosch Platinum 2's or 4's...Don't get E3 diamond fires.

 

[HOT_ROD_CAR]

i'd say Bosch Platinum 2's or 4's...Don't get E3 diamond fires.

I am wondering if I can get better performance with a hotter plug? I have the stock OEM replacements installed now, but I would like to try a different type like Splitfire, Bosch, or something else to see if it will make much of a difference.

 

[countryboy]

the only problrm with people going to a hoter plug is most keep a stock ignition system. think of it this way how is a hotter plug going to deliver hotter spark if it doesn't have a hotter coil to go with it

 

[Bob Ayers]

the only problrm with people going to a hoter plug is most keep a stock ignition system. think of it this way how is a hotter plug going to deliver hotter spark if it doesn't have a hotter coil to go with it

A HOTTER plug does not produce a HOTTER spark! The center electrode runs HOTTER on a HOT plug, COOLER on a COLD plug.

http://www.ngk.com/charglossary.asp?kw=Heat+range


Your best bet is to run the OEM Motorcraft plugs.

 

[RangerFabWorks]

id run motorcraft, or ngk plugs.

i dont like bosch or champion or any of that nonsense.

just a regular plug, and if you want a little better spark, close the gap to 0.030 and your good to go.

 

[B&G_Automotive]

i'd say Bosch Platinum 2's or 4's...Don't get E3 diamond fires.

Stay away from multi electrode plugs, especially on a carbed motor. They foul very quickly and give generally worse performance than a factory plug due to a weaker spark. A fancy box and neat advertising never made them any good, they are an over all junk product that I have never seen anything good out of.

 

[doorgunner]

fyi........multi-electrode spark plugs were used in aircraft engines....a spark plug with 2 seperate side electrodes (not one side electrode pinched into a split on the tip)

if the single side-electrode spark plug fouled out...the cylinder was dead

with a dual side-electrode spark plug...the spark had a chance to jump to the other side electrode if one side-electrode fouled out....at least that was the theory.....problem was.....you didn't know the plug was in bad shape until the plug quit firing completely.....

back to square 1

not a good thang at cloud level

(if you REALLY wanna throw a 3" long spark instead of a 00.050" long spark.....figure out how to run a magneto....then, you won't even need that little L-shaped side-electrode!!!!!!)

 

[baddad457]

A HOTTER plug does not produce a HOTTER spark! The center electrode runs HOTTER on a HOT plug, COOLER on a COLD plug.

http://www.ngk.com/charglossary.asp?kw=Heat+range


Your best bet is to run the OEM Motorcraft plugs.

All of the above times TWO !!!! Open chambered Cleveland heads have enough problems with preignition/detonation without introducing one more factor to the equation. Colder plugs are what he wants, not hotter.

 

[Bob Ayers]

fyi........multi-electrode spark plugs were used in aircraft engines....a spark plug with 2 seperate side electrodes (not one side electrode pinched into a split on the tip)

if the single side-electrode spark plug fouled out...the cylinder was dead

with a dual side-electrode spark plug...the spark had a chance to jump to the other side electrode if one side-electrode fouled out....at least that was the theory.....problem was.....you didn't know the plug was in bad shape until the plug quit firing completely.....

back to square 1

not a good thang at cloud level

(if you REALLY wanna throw a 3" long spark instead of a 00.050" long spark.....figure out how to run a magneto....then, you won't even need that little L-shaped side-electrode!!!!!!)

The side electrode isn't what fouls, it's the center electrode. It will either foul (short) to the side electrode, or the insulator will coat with carbon, creating a short to the body (GND) of the plug. In either case, mutliple side electrodes won't help you.

 

[doorgunner]

10-4....now i understand why i always use plain ole spark plugs....LOL

 

[HOT_ROD_CAR]

Thanks for all the great info. This board kicks a$$!

 

[t_dickie]

i dont like bosch or champion or any of that nonsense.

Ditto on the champion plugs. You're better off threading them into the ground than a cylinder head.