Where to find Motorcraft DOUBLE Platinum plugs???

[revivingsho]

Yes, I searched on 2 SHO forums about it, and almost every single person have different answers So I hope I can end this confusion in this thread.

Where can I get the now obsolete(hard to find) AGSP32PP Motorcraft Double Platinum Plugs? I see a few sites selling them, but their webpage looks ancient and outdated, so I better stay away

I see Motorcraft AGSP32FM (recently renamed to SP497), which many claims is the replacement of AGSP32PP, but this is Single correct? Some says this is Double, so I am confused

Either way, help would be greatly appeciated. And no, I don't want to even pay a penny to the local Dealers

 

[HotRodKid]

are you doing a resto or something ? why do u need original plugs ?

 

[1993MTXSHO]

I jsut got some a few months ago I got them from rcm automotive they might still have some if you go and check now

http://home.earthlink.net/~rcm_automotive/id8.html

 

[NWGRN94MTX]

Where can I get the now obsolete(hard to find) AGSP32PP Motorcraft Double Platinum Plugs?

agsp32pp are now obsolete. You may be able to find some from someone who has a few sets stashed away.

The best replacement I have found is the Denso p/n PK16R11.

 

[revivingsho]

I jsut got some a few months ago I got them from rcm automotive they might still have some if you go and check now

http://home.earthlink.net/~rcm_automotive/id8.html

But it only says 24.99- Motorcraft platinum spark plugs. Are they DOUBLE PLATINUM? or are they SP497 which is available everywhere??

And to those that is asking why I need Motorcraft Double is that I had some problems using aftermarket ones etc...Everyone is not going to have the same problems, but I don't want to get anything besides what should be used for the car.

 

[1slickRED89]

the autolite XP3924 would be the exact same plug as an AGSP32FPM, which would be the plug you want (if they made it), finewire, nickel plated shell and double Pt. all for about $6 each, what a deal.

 

[projectSHO89]

The -PP suffix double platinum Motorcrafts are discontinued.

The -FM suffix fine wire single platinum Motorcrafts are the new replacement. The fine wire technology makes the double platinum electrodes unnecessary.

Don't worry, they work perfectly. I've installed plenty of them over the last couple of years without any problems or callbacks.

Steve

 

[sdpatt]

are you doing a resto or something ? why do u need original plugs ?

Just to provide a clear response to this question, the use of the original equipment plugs is to ensure the best performance of the engine in terms of both power and emissions control. The manufacturer designed the engine with a specific plug to maximize the combusiton efficiency for both maximum power and minimum emissions. Unless an aftermarket plug were designed exactly the same as the OEM plug, there would be compromises in one or both of those performance aspects. On the SHO engine, we also have the consideration of inadequate sealing of the spark plug boots at the valve covers with the taller aftermarket plugs. The poor seal allows contaminants in the plug wells which can also deteriorate the spark energy and combustion efficiency.

 

[Mr Anonymous]

Just to provide a clear response to this question, the use of the original equipment plugs is to ensure the best performance of the engine in terms of both power and emissions control. The manufacturer designed the engine with a specific plug to maximize the combusiton efficiency for both maximum power and minimum emissions. Unless an aftermarket plug were designed exactly the same as the OEM plug, there would be compromises in one or both of those performance aspects. On the SHO engine, we also have the consideration of inadequate sealing of the spark plug boots at the valve covers with the taller aftermarket plugs. The poor seal allows contaminants in the plug wells which can also deteriorate the spark energy and combustion efficiency.

And since the OE factory plugs have been discontinued for over 2 years and can be hard to find, this point -- while perfectly valid -- is more or less rendered moot.

As Steve has said, the FM plugs work just as well as the PP plugs, and we have installed at least 50 sets in V6 cars without a single issue and found that the factory plug wires still fit and seal fine as well.

 

[zak]

Because of the waste spark system the SHO uses, half the plugs will sputter (liberate) metal from the ground electrode, and half from the center electrode.

You only need to use double platinums on the rear bank (one that sputters from the ground IIRC). I can double check this tonight (have a low mile 3.2 with untouched OEM plugs in it, plus I examined the plugs that came out of my original owner 3.0 recently under a microscope)

I use the Denso plugs on the front bank only (sputter from center electrode, so you need Pt or Ir there).

zak

 

[1slickRED89]

right, the only reason to run double Pt's is if you want them to wear well past 50k miles. without pt the groundwire will start to wear off (on reverse polarity firing plugs) and cause accelerated gap growth. the GW base metal is just inconel and it wears slightly faster if it doesn't have the platinum enhancement.

 

[projectSHO89]

Because of the waste spark system the SHO uses, half the plugs will sputter (liberate) metal from the ground electrode, and half from the center electrode.

You only need to use double platinums on the rear bank (one that sputters from the ground IIRC). I can double check this tonight (have a low mile 3.2 with untouched OEM plugs in it, plus I examined the plugs that came out of my original owner 3.0 recently under a microscope)

I use the Denso plugs on the front bank only (sputter from center electrode, so you need Pt or Ir there).

zak

Your information is obsolete in light of the finewire plug introduction.

The finewire plug's ground electrode erodes a such a slow rate, it will still give similar service life as a -PP plug without degradation, regardless of which bank the -FM is installed in.

Steve

 

[whiteman_01]

I got a set a couple of weeks ago from O'Rileys. They didn't have them on hand but they got them out of there warehouse in about an hour. They were far cheaper than the autolites too. If i remember right they were about $2.30/plug.

 

[zak]

Your information is obsolete in light of the finewire plug introduction.

The finewire plug's ground electrode erodes a such a slow rate, it will still give similar service life as a -PP plug without degradation, regardless of which bank the -FM is installed in.

Steve

Your information is misguided. The direction of electron flow dictates whether the ground electrode or center electrode erode away, not whether the plug is of fine wire type or not (the waste spark system fires two plugs at a time). Because the DIS is relatively high energy ignition, wear of a plane nickel ground electrode, on the cylinders where electron flow causes them to erode instead of the center, can be pretty rapid compared to plugs having a Pt (or Ir) button on the ground side.

 

[1993MTXSHO]

But it only says 24.99- Motorcraft platinum spark plugs. Are they DOUBLE PLATINUM? or are they SP497 which is available everywhere??

And to those that is asking why I need Motorcraft Double is that I had some problems using aftermarket ones etc...Everyone is not going to have the same problems, but I don't want to get anything besides what should be used for the car.

I just got the autolight ones since there pretty much the same thing as the stock replacement.

 

[revivingsho]

I just got the autolight ones since there pretty much the same thing as the stock replacement.

I would still want to use the Motorcraft Double PP if I can find any regardless of whether for street or track, because I know people using Autolite Double app3942 which is a bit taller than OEM, so if that were true, I would use the Motorcraft single P over Autolite double PP, as Autolite would start getting debris in and actually last shorter. It might not make much difference since everyone's driving style is different, thus there's no rocket science answer
Thanks for everyone's help so far. If anyone knows where to get the Motorcraft Double PP, let me know.

 

[1slickRED89]

If anyone knows where to get the Motorcraft Double PP, let me know.

good luck, you may find enough backstock to get you through the life of your car, but they are getting rare. there are alot of other motorcraft plugs that work great in the SHO such as any AGSF spark plug (3 heat range or colder) will work in the SHO, even though its conical seat instead of gasket. for example, I run motorcraft AGSF12FM1 plugs in my turbo car, because its a finewire plug, 2 ranges colder, that has a copper-core sidewire.

Autolite Double app3942 which is a bit taller than OEM

the only difference between motorcraft and autolite is that motorcraft uses an annealed gasket that may crush down a bit more that the non-annealed gaskets, thats the only reason why the autolite may be a bit taller, only if not installed tight enough. that and autolite uses a black glaze instead of blue.

 

[projectSHO89]

Your information is misguided. The direction of electron flow dictates whether the ground electrode or center electrode erode away, not whether the plug is of fine wire type or not (the waste spark system fires two plugs at a time). Because the DIS is relatively high energy ignition, wear of a plane nickel ground electrode, on the cylinders where electron flow causes them to erode instead of the center, can be pretty rapid compared to plugs having a Pt (or Ir) button on the ground side.

No, my information is correct.

The finewires fire at a lower voltage which reduces the rate of sidewire erosion regardless of the polarity of the firing pulse.

As I said, your information is outdated.

Steve

 

[1slickRED89]

with saying too much, base metals are very temperature sensitive with regard to wear, hotter --> more wear, and not all that voltage dependant. were platinum is voltage dependant on wear, more required voltage -> more wear. the main factor with required voltage is gap, so as gaps get bigger so does wear rate, and vise versa.

Also not all finewires are the same, the motorcraft finewire alloy (very high platinum %) is not as durable as the autolite XP finewire alloy. that's one reason I recommend the Autolite XP over the motorcraft. the technology in the autolite XP is as good or better than any "high tech" plug out there, much better in some cases.

 

[Mr Anonymous]

I would still want to use the Motorcraft Double PP if I can find any regardless of whether for street or track, because I know people using Autolite Double app3942 which is a bit taller than OEM, so if that were true, I would use the Motorcraft single P over Autolite double PP, as Autolite would start getting debris in and actually last shorter. It might not make much difference since everyone's driving style is different, thus there's no rocket science answer
Thanks for everyone's help so far. If anyone knows where to get the Motorcraft Double PP, let me know.

Do you still take your car to the dealer for all your oil changes too? All this fussing about finding PP plugs is kind of silly.