Roger Blackmore

I can't seem to find a plug colder than a b9efs. Does NGK make a b10efs? I've got a couple of lean cylinders that I'd like to put a colder plug in.

Roger Blackmore

If they make the plug, what is the stocking number?
Thanks,
Roger

ATVracr

iTrader: (5)

We run the R5671a-11

Roger Blackmore

Will that plug work in a cathedral head?

ATVracr

iTrader: (5)

Its a gasket seat so not sure it will work on stock head.

ATVracr

iTrader: (5)

Nitrous (three steps colder)
Heat Range: 9
Gap: Consult
Plug: NGK B8EFS 1085; Autolite AR93

Nitrous (four steps colder)
Heat Range: 10
Gap: Consult
Plug: NGK R5724-10 (stock number 7993); Autolite AR92

Roger Blackmore

No, it needs to be a tapered seat. I wish they were gasket seat ( from heaven ). Lol. Thanks though. Maybe Nitro Dave will chime in.

ATVracr

iTrader: (5)

The stuff I posted above is from the sticky at the top and it is the list of plugs for stock heads.

Plug: NGK R5724-10 (stock number 7993) .... is what you need.

Nitro Dave's Nitrous Outlet

iTrader: (25)

I just talked to NGK tech. The number ATV listed is a projected tip plug.

The number 9 is the coldest non projected tip plug NGK offers for a tappered seat head.

Brisk offers a step colder than the number 9 NGK. Its a part number G08S and its 10.99 a plug.

Dave

Roger Blackmore

Thanks ATV, and Dave,
I'll stick with the 9 I guess. Dave, it's a 13:1 motor. 500 hp to the wheels through a turbo 350. I'm wanting to het it to work with a 300 shot through one of your plates on a 90/90 intake. You think the 9 is cold enough?

Nitro Dave's Nitrous Outlet

iTrader: (25)

Roger, You are currently doing a 250 correct? How is the coloring on the strap looking? With the compression you are at a 10 plug would be a good start but IM thinking a 9 will be fine.

Run some C-16 or NOS fuel, Be concervative on the timing. Watch the plugs close.
Dave

ATVracr

iTrader: (5)

Good info, someone should change the sticky above. LOL

#9 should be OK on a 300 shot just start with the timing low and creep up on it.

Roger Blackmore

I'm running C-12 in the motor, and C-16 in the dedicated. I will try to get some pics on the 250 and 300 plugs as soon as I get my converter back.
Thanks again guys
Roger

camscam02

iTrader: (21)

word of advice. Just run c16 all the way around. It will simple things up a good amount and less chance of error IMO

Roger Blackmore

Yea, my VP dealer at the local track said the same thing. Said it gives a little wider tuning window. I'll give that a try. Thanks Cams.

Nitro Dave's Nitrous Outlet

iTrader: (25)

Roger, Yea you are at the point its not worth chancing it. Put some 116 in it.
Dave

Roger Blackmore

Dave,
You're running the VP C-16 in your's. Correct?

Nitro Dave's Nitrous Outlet

iTrader: (25)

Yes sir, Well Its sonoco. Came from Bobby Joe.


Im making a few changes to my car and it will be out again. Probably a week or two. We may try to go to San Antonio. If you would like to go Ill let you and Mike know when.
Dave

Roger Blackmore

Yea, I'd be interested in going. If my converter is done in time. Lol. Hey Dave,
Does that Sonoco turn your plugs red?

minytrker

iTrader: (13)

No, it doesn't. I run same 116 from same supplier.