The E85 Sparkplug Thread

[STATUS]

sorry i forgot to add the part number NGK R7434-8

[czy18e]

They were way too dear mate got some bcpr9es ones from down the road and will give them a go. Reckon they will be too cold?

I'll gap em to .55.

[scotty nm35]

Copper plugs won't like being gapped down quite that far, only iridiums will handle that gap I think. Iridiums are more expensive to buy initially but they last 10 times as long.

[czy18e]

I have the bcpr7es gapped to .55 and they work a treat at lower boost but I'll try the iridiums if no luck.

[STATUS]

performance isnt cheap.... that said those plugs listed above have been in a circuit car for 3 years and are still mint at 35psi

[SiR_RB]

I've been running NGK bkr8e for afew years now on e85 and 450kw no issues

$6 ea

[iruvyouskyrine]

What is the actually difference between a BCP and a BK plug? Have heard the electrode is different but not sure in what way.

I have only ever run BCP's in 6 and 7 heat range on all my RB's and never once had an issue.

[czy18e]

Cheers sir rb I will grab some of them if the 9's are too cold.

[89CAL]

The difference is in the thread length i think (BCP-BK)

Ive used both. I get plugs from Nissan now as per recommendation from my tuner. Still NGK just a different number but cant remember what it is

[STATUS]

I've been running NGK bkr8e for afew years now on e85 and 450kw no issues

$6 ea

yup most of the time we run coppers in street cars around that power but in anything serious that pushes the std coil packs or splitfires we up the spec to the race plugs otherwise you will change them like underwear

plus you will get more timing in consistently with a finer tip.. very important in circuit cars where the large electrode in a std copper plug will want to induce pre-ignition.

[STATUS]

What is the actually difference between a BCP and a BK plug? Have heard the electrode is different but not sure in what way.

I have only ever run BCP's in 6 and 7 heat range on all my RB's and never once had an issue.

2.5mm in contact tip height.