TR4/4A TR4 Spark Plugs

[MikeH]

Hi All, I know this subject has been talked to death, but I need the number of the AC spark plug for the TR3 and 4. I've tried search with no results. I'm at work and want to get a set on my way home.

 

[Andrew Mace]

I think 43FS is the AC part number equivalent to the (usually) OEM Champion L87Y.

 

[tdskip]

Here is the Moss guide for what it is worth, plugs are listed by car;

https://www.mossmotors.com/MemberServices/CarSpecifications/CarSpecsModelIndex.aspx

The following is from the UK, so I don't know if the part numbers will work in the US, but here is a link for a Champion to NGK model cross reference in case you can't find the Champions;

https://www.spark-plugs.co.uk/pages/technical/champion860-n288.htm

 

[MadMarx]

I have had very good results with the BOSCH Super 4 WR 78 G.
The plug has 4 electrodes.

 

[toysrrus]

Hi Mike:

I`m a Sales Mgr for "NGK SPARK PLUGS" (Not being Prejudice): Bosch & NGK are quite Popular with the TR Applications: If It`s a "General Use" type of Appl. Your after; You may want to try "NGK BPR6ES": They cost considerably Less than the "Platinum" Versions and Perform Extremely Well in a "General Every Day Usage" Application:

Have Fun Experimenting;

Russ
PS: Gap is to be .025: No need to gap "Platinums":

 

[RonMacPherson]

I've run Bosch, AC, Champion, Autolite and NGK. Haven't run the latest four terminal Bosches, so no advice there.
But for the cost I recommend the NGK. [censored] near indestructible, A lot less susceptible to fuel additive fouling(AC's notorious for that) and not that expensive.

 

[Merlin63Tr4]

Per my book, the correct NGKs' for Tr3/Tr4 applications are <span style="color: #FF0000">BP6HS or BPR6HS</span> (resistor) I think the <span style="color: #000099">BPR6ES</span> is the wrong reach. Also good are the Champion <span style="color: #FF0000">L87Y or the L87YC</span> (copper core).
/bcforum/images/%%GRAEMLIN_URL%%/driving.gif I have used the Bosch <span style="color: #FF0000">WR7BP</span> (platinum) but I'm not sold on them. /bcforum/images/%%GRAEMLIN_URL%%/smile.gif

 

[Bugeye58]

BP6HS have a 1/2" reach. BP6ES are 3/4" reach.
Jeff