Autolite double platinum plugs? Also indexing?
 

Are they good for a racing application? Naturally aspirated. 13.5 to compression.
I've never used them, but they are a semi retracted tip (half way between the plugs I am currently using and the stock champion plugs) plug with a fine electrode.
They will fit without worrying about the pistons colliding with them.
Also how should the plug face. If I use the indexing washers?

Re: Autolite double platinum plugs? Also indexing?
 

Art,
Double Platinum plugs were not designed for a high compression racing engine; the Platinum coating is just for protecting the electrode from wear and corrosion; designed for daily use and a longevity and not performance.
Find a real racing plug that has a colder range than the current OEM plugs and see how a bare or Copper, non-resistance electrode plug works for you.

Also, my preference have always been the racing plug offerings from NGK or Autolite.

http://www.ngksparkplugs.com/docs/RacingSpecs2010.pdf

Re: Autolite double platinum plugs? Also indexing?
 

Artie, only time I ever saw any reason to indexing plugs was to prevent knocking the ends off. I have played with indexing with the car I have now and saw nothing. But, I don't have Hemi chambers. Might make a difference.

I would use plain old non-platinum Autolite plugs. I would want my plugs at least .050" off the pistons at TDC. Closer may require more advance. Something to play with.

Re: Autolite double platinum plugs? Also indexing?
 

Thanks but there are no plugs in their racing series that will fit. I run a 14mm tapered seat with a 1 inch reach plug.
I need the resistor plug so it doesen't interfere with the ECU.

Re: Autolite double platinum plugs? Also indexing?
 

I'm shooting for at least .050 (Aluminum Rods). I don't think indexing will make any difference except maybe for clearance. I have the washers But didn't know anything about them.
The regular plug has to much tip extended. I'm afraid I could knock the ground wire off and cause some damage. Was going to try to stack 2 washers together, but that doesn't look like it will work.

Re: Autolite double platinum plugs? Also indexing?
 

Art, what is the part number of your current plugs?

Re: Autolite double platinum plugs? Also indexing?
 

Art, I had a brain fart (nothing new) but extended plugs often need a half degree or so less advance than retracted tips. Changing types of plugs may change that too. Naturally you want to try less first.

Re: Autolite double platinum plugs? Also indexing?
 

The plugs I've been using are Brisk RR12S The stock plug would be a Champion 470.
The plug I'm going to try is an Autolite APP5263.
My cylinder head is from a 2000 PT Cruiser.

Ed I've heard the same thing about the extended plug and the timing. I'll take some out before running it. I ran more timing than other comparable neons. Could have been the retracted tip.

Re: Autolite double platinum plugs? Also indexing?
 

Here are some pics of the plugs
http://i203.photobucket.com/albums/aa12/rt1092/036.jpg
Brisk RR12S on left, Champion 470 (stock) center Autolite APP5263 on right.
http://i203.photobucket.com/albums/aa12/rt1092/035.jpg
http://i203.photobucket.com/albums/aa12/rt1092/034.jpg
Brisk plug in head
http://i203.photobucket.com/albums/aa12/rt1092/033.jpg
Autolite plug in head

Re: Autolite double platinum plugs? Also indexing?
 

Art,

I would recommend the following Autolite Racing plug numbers:

AR3932X or AR3933X

The AR3932X is a colder plug.

Re: Autolite double platinum plugs? Also indexing?
 

Are those 25mm (1") reach with a tapered seat and 5/8 (16mm) hex?
Those are the parameters I need

Re: Autolite double platinum plugs? Also indexing?
 

The specifications show the lengths as follows:

The Champion 470 is 25.5mm (1.00") long.
The Autolite AR3932X is 25mm (0.984) long.

The Autolite plug is also shown as a plug application for the late model Hemi engine.
It may not require adding the washers as you want to.

http://shop.advanceautoparts.com/wcs...x_pri_larg.jpg

http://i.ebayimg.com/18/!BucMrUQBmk~...nhJylg~~_3.JPG

Re: Autolite double platinum plugs? Also indexing?
 

The Autolite X plug shown is 3/4 reach gasket seat, They do make a .708 tapered seat X plug I have all of the X plugs in stock.
Rich

Re: Autolite double platinum plugs? Also indexing?
 

What's the story on the X plugs? Any performance gains? What is the target market?

Re: Autolite double platinum plugs? Also indexing?
 

Art,

It double checked and the above plug is incorrect.
The confusion stems from your statement for a plug for a 2000 PT Cruiser cylinder head. The PT Cruiser was launched in 2000 as a 2001 model.

So, for a 2000 Neon application, the spark plug is not tapered, it uses a gasket and the above racing plug will work.

You should look at the tapered plug that Rich (quickford1) has available.

Re: Autolite double platinum plugs? Also indexing?
 

To try to answer everybody at once I will try to explain the X plug. It was first used in Nascar because of ground straps burning off or breaking off, they are made by both Autolite& Champion in limited heat ranges and numbers .They are used by just about every team. They are available 708 tapered seat & 3/4 reach gasket seat. The best part is no need to index. These plugs are made in limited runs so are hard to get sometimes.
Rich

Re: Autolite double platinum plugs? Also indexing?
 

Got anything equal to an AR473? Indexing taper seat plugs is a pain! May save alot of aggrivation here. Joe

Re: Autolite double platinum plugs? Also indexing?
 

Joe
The hottest they make in a X plug is a AR471X-10 it is equal to a 472 or S57C champion.
Rich

Re: Autolite double platinum plugs? Also indexing?
 

I happen to run an AR 92 or AR 94. Looks similar in shape and design when it comes to the AR3922 plug other than the tapered seat.

Re: Autolite double platinum plugs? Also indexing?
 

The AR92&AR93 are a .708 reach tapered seat plug ,both are power tip plugs that are good for some HP if you have some piston to plug clearance. 92=472 & 93=473 I have plenty of both.
Rich