What does everyone run in their V10 for
spark plugs when you change them ?

I want to change plugs this spring and I
want a good replacement that will last.

Should I stay with Motorcraft or how
about NGK's, Autolite, etc.

Just looking for suggestions ......... Thanks.

 

Jhemr, Just rember that platinum melts at an extremly high temp. so it lasts long. But Platinum has the resistance of wet wood, so performance is not good. If you don't mind changing your plugs every 30,000 miles than a good copper plug is still hard to beat for performance. Most manufactures these days install platinums from the factory and then brag about 100,000 miles before a tune up. The best performance measurement for a sparkplug is the resistance of the metal used, this basicly is a measurement of how much energy that pases through the plug (good) versus how much enery doesn't pass, due to the metals inability to transfer electric current, like a cloged water pipe with holes. on one end you have water goining in under high pressure but limited volume.
on the other end you have very little pressure due to the fact that 25% of the water that entered the pipe leaked out and never made it to the other end.

 

I disagree on the platinum resistance, the effective "series resistance" of the platinum electrodes is < 5 ohms, compared to
1000's of ohms series resistance in plug wires!!!

 

So you disagree that platnum has more resisstance than copper?

 

No, platinum has a higher resistivity than copper, but the point I'm trying to make, the increase in resistance of platinum compared to copper is insignificant, and will not effect spark
performance!! The "effective series resistance" number of < 5
ohms is for Motorcraft platinums, which are the best plugs to use in Ford engines (IMHO).......

 

Still..have you changed the plugs in your V10 yet!? Talk about a pain in the ***!

The insignificant performance increase is severely offset by the desire to keep the skin on the knuckles and the curse words out of kid's ears.

The Motorcraft platinums are good plugs. Just get the updated ones.

 

What did they update on them, or how do you tell ?

 

They went to a "Fine Wire" platinum. For example, the OLD
double platinum P/N for my 3.0L FFV was AGSF12PP, the new
"Fine Wire" platinum P/N is: AGSF12FMF6

I hope this helps!!!!!

 

This picture will show the difference between the early model year V10 and the latter. More threads on the latter. Not sure if you can read the the part number or not...

 

What would you say was good miliage out of these plugs? I got 60,000 Towing a 32ft. trailer shorten the life. 40,000 off of Ford's 100,000 mile tune up!

 

I got 112,000 on mine. Still runs so I aint changing them.. lol I know I'll open a can of worms if I do.

 

Is the extra threads to keep them from blowing out the head?I normaly like the autolite double plat.

 

changed mine the other day and have noticed a significant reduction in power. Not to mention "what a pain in the " anyway I think something is wrong so I am going to the dealer and get it checked out

 

Some say yes. They changed plugs for a reason. nothin gelse changed but the amount of threads. But the problem with the amount of threads in the head still exists.

Still a safer bet than the short threaded plug. IMHO

 

How many hours does it take to change these plugs? I had a chrysler w/440 that would take me 45 min. My Ford 390 takes a fraction of that time. I'm dreading that day. I don't want to take it to the dealership. I can just imagine the cost and I don't like anyone else messing with my vehicles if I can help it. The last time I brought the truck into the dealer, the knucklehead that drove it out for me was riding the clutch.