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CJ3B Bulletin Board > CJ-3B Posts > get'n plugs out, better plugs, hotter plugs


Title: get'n plugs out, better plugs, hotter plugs
Description: J8 J8c L86c/B6HS L90c/B5HS


yjcanibul - October 11, 2011 06:41 PM (GMT)


get'n plugs out:

had to change my plugs twice last month, i notice the J8c need more torque
to get them out then they were torqued too - will anti-seize cure this ?


better plugs:

the J8/J8c and equiv plugs have 3/8 inch reach , someone with head off
on ECJ5 site noticed the plug doesnt protrude into combustion chamber
as expected so are using champion L86c which is identical dimenstion to
J8 plug but 1/2 inch reach (+1/8 inch) - theory is better combustion if
electrod exposed ...

this sounds like a decent upgrade - anyone running these in 3B ?


hotter plugs:

hotter plugs can sometimes be used short term to counter plug
fouling as tip of plug stays hotter to burn off deposites , J8/J8c
offer no hotter plug i could fine but the L86c does - champion L90c
and NGK B5HS - the NGK would be at least 70c/158F hotter longer at tip

anyone running hotter plugs , if so which ones ?


Bob - October 12, 2011 12:33 AM (GMT)
I'm running the ngk bh6s plugs for a little more heat.

oldtime - October 12, 2011 01:03 AM (GMT)

johnrb - October 12, 2011 12:36 PM (GMT)
QUOTE (yjcanibul)
... had to change my plugs twice last month, i notice the J8c need more torque to get them out then they were torqued too - will anti-seize cure this ?

Yes.
I've used high temp / high pressure anti-seize for decades. The sticky, silver stuff in a brush-top can. I've used it on spark plugs and lug nuts since I started working on cars in the 70s. Never had one freeze up on me. Use it sparingly.

yjcanibul - October 12, 2011 02:13 PM (GMT)
QUOTE (Bob @ Oct 11 2011, 05:33 PM)
I'm running the ngk bh6s plugs for a little more heat.

thanks for all the replies ...

yes the b6hs is the ngk equiv of champion L86c ( 1/2" reach )

its interesting the volkswagon beattle and transporter also use
b6hs and b5hs

ngk # get smaller for hotter, higher for colder while champion
is the opposite

i am trying to track down a set of b5hs slightly hotter plugs to install
this weekend to see if it can temp remedy fouling ...

i will use the antiseize on them too - i always put a drop of oil on the threads
putting them in and never had any issue except fhead, i read thread damage can
occur

Bob - October 12, 2011 03:07 PM (GMT)
I'd even try autozone for them. You just have to have someone look them up. Don't you wish the heat ranges would be standardized? I use just a bit of anti seize on the plug threads...very, very little and have never had an issue.

oldtime - October 12, 2011 03:20 PM (GMT)
QUOTE
the J8/J8c and equiv plugs have 3/8 inch reach , someone with head off
on ECJ5 site noticed the plug doesnt protrude into combustion chamber
as expected so are using champion L86c which is identical dimenstion to
J8 plug but 1/2 inch reach (+1/8 inch) - theory is better combustion if
electrod exposed ...

this sounds like a decent upgrade - anyone running these in 3B ?


The spark plug thread reach ideally should be flush with the depth of the head.
Excess internal or external threads will collect a certain amount of carbon.
If the plug threads are too long it may cause problems with spark plug removal.
So its better to have the reach to short rather than too long.

The thread depth of a Hurricane head is exactly 3/8" deep.
The Champion J-8 plug threads are also 3/8" deep.
The J-8 plug gasket is about 1/16" deep.
This inferrs that the ideal plug reach should be no more than 7/16" deep to allow for the gasket.

A hotter plug is may be better in the colder climates or under constant stop n go conditions.

The NGK B6Y fits standard Hurricane applications.
Perhaps they make an NGK B5Y for a hotter replacement ?
Perhaps they make a 7/16" reach ?

yjcanibul - October 17, 2011 03:33 PM (GMT)
no B5HS in town, found champion L90c
which is slightly hotter than L86c which
is 1/2 in reach version of J8c


also changed oil to Castrol high mileage
10w-30

first off hard starting at .030 gap, changed
gap to .025 no better, so tried .035 better
but .040 gap starts better


let it idle 45mins, pulled plugs no deposits,
no test drive yet on flat land (tank issue) ,
but it seems fouling issue under control

not sure what to make of larger gap yet or
if it will behave at higher speeds, thoughts?

COPPERSWILLY - October 19, 2011 11:19 PM (GMT)
I run champion 295s in my jeep... Been running them for years




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