Recessed tip spark plugs???

[Bill_Ritter]

Does anyone know of a spark plug part # for IRON heads that doesnt have the protruded tip like a factory one? Ive tried the CR42's, and NGK's but I'd like to try a different option if its available.

Thanks,
Bill

 

[DR BOOST]

R43T

 

[Bill_Ritter]

R43T

No, thats the same as the Cr42ts/cr43ts/r42&43ts... they're all protruded tip design. I'm looking for a plug that has the electrode flush with the end of the threads (like the guys with aluminum GN1's run)

Edit: I assumed you meant r43ts... I didn't know there was a just a r43t. I'll check it out.

 

[Chris Hogeland]

Just like he said R43T.

 

[forcefed3.8's]

R42T also.

 

[Bill_Ritter]

Thanks guys! I'll get a set.

 

[Jerryl]

What is the advantage and at what power level?

 

[RmvBfrFlght]

In the Autolite line it is the 144.

A non-projected tip spark plug is less likely to over heat and cause pre-ignition during high speed & load running.

RemoveBeforeFlight

 

[Jerryl]

..........A non-projected tip spark plug is less likely to over heat and cause pre-ignition during high speed & load running. . . . . .

Thought so.
Thanks for the reply. Doubt it will do anything at my power level.

 

["Reaper"]

NGK # 2817 or R5673-7 same plug. This is what I run.

http://ngk.com/results_cross.asp?pid=2817&x=0&y=0

 

[Pronto]

NGK # 2817 or R5673-7 same plug. This is what I run.

http://ngk.com/results_cross.asp?pid=2817&x=0&y=0

2 questions on that plug; does the non-resistor interfer with the radio and does that cold a plug foul up quick? I run UR5s.

 

[KevinB]

7 ison the hotter side for a ngk

 

[Pronto]

7 ison the hotter side for a ngk

No, NGK go colder as the number goes up...

 

["Reaper"]

2 questions on that plug; does the non-resistor interfer with the radio and does that cold a plug foul up quick? I run UR5s.

No problems at all with the radio and I run 93 and alky @ 24* and 25 psi. Plugs run nice and clean I have the gap @ 35 right now still playing with the gap.

 

[KevinB]

No, NGK go colder as the number goes up...

Exactly. I've never seen anyone go hotter than a 6 or 7 in a ngk in a Buick. Maybe you have? Most I know are in the 8-9 range. I know my engine liked 9's after reading the plugs.

 

[KevinB]

I just looked it up. A ac 43ts is a 6 heat range. That would be the hottest I think one would go in a Buick above stock boost level.

 

[KevinB]

Just found this pretty good link.
http://www.sparkplug-crossreference.com/

 

[getdowngranny]

I used to run recessed plugs on my nitrous cars at higher power levels. It tames detonation better than a protruded plug. I have always run ngk's and on imported brand plugs the higher the number the colder the plug. Domestic plugs the higher the number the hotter the plug.

 

[Pronto]

Been runing UR5s for years after being recommended by Russ Merritt. Maybe I'll try the colder plugs.

 

[KevinB]

Looks like the ur5 crosses with a 42ts which is a cold plug. The 5 in that doesn't fit the scale that I'm used to that ngk uses. All the plugs I've ever used from them have the part number then a dash then the heat range.