Spark plugs

[Scams]

Hi All
Would like to know people with jmm cams in do you use xr6 spark plugs. If so does it help?

[Sweet_EL_]

xr6 spark plugs?? I thort the spark plugs and leads were all the same?!?

[SupahStah]

Originally Posted by Sweet_EL

xr6 spark plugs?? I thort the spark plugs and leads were all the same?!?

I thaught that too...

But I do know the high performance ones from bosch are supposed to be realy good, livend up my old ED a little. Yet to try it in my new car but.

[efgiar]

xr plugs have a 1.1mm gap, non xr have .8 or.9mm

[naughtyfalcon]

um my normal spark plugs have a 1.1 mm gap,,so the xr plugs are normal plugs.

[Chrispy]

EB-ED XR's are one heat range colder.
I'm not sure about EF on.

have a look in the manual.


Chrispy

[Scams]

Normal motorcraft ags 42cc
xr6 motorcraft ags 23cc

[efgiar]

Originally Posted by naughtyfalcon

um my normal spark plugs have a 1.1 mm gap,,so the xr plugs are normal plugs.

not sure about EA's but i kno for a fact that XR and std plugs are different. look in the bosch/ngk book

[Damo]

yeah XR6 plugs are different, I got some newies recently, they were like $6 each, can't remember what brand they were NGK I think.

[Scams]

[QUOTE]yeah XR6 plugs are different, I got some newies recently, they were like $6 each, can't remember what brand they were NGK I think.
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Did it make a difference? If not why are the xr6 plugs different?

[Damo]

I replaced the leads at teh same time which seemed slightly damaged. I have no idea why they are different, maybe because the design of the head in the XR's is the main differance in the motors. Car reved a fair bit smoother with the new plugs and leads, but I put that down to the old ones being overdue for replacement.

[Scams]

Took the plugs out today the plugs are rusty is this normal?

[Blue Ice]

[QUOTE=Scams]

yeah XR6 plugs are different, I got some newies recently, they were like $6 each, can't remember what brand they were NGK I think.
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Did it make a difference? If not why are the xr6 plugs different?

Pretty sure the only difference is the heat range.

[Bill_R]

Originally Posted by Scams

Took the plugs out today the plugs are rusty is this normal?

General rule - colder plug => hotter engine and the reverse applies.

greyish/tan to white is usually correct heat range.

Soft, black, sooty but dry could be too cold a plug.

Plugs that are too hot can suffer from preignition damage. the porcelain can be porous looking and almost "sugary".

Best to hunt around and look at a few pics of the types of problems that show up in plugs. I have a brilliant auto book that shows them all but its in storage many miles away.