autolite racing spark plug

F

fastreddevil1

New Member
#1
#1
Are they worth getting ? Have read some posts where people have had good luck with them and have seen some where they have made an engine run terrible .. whats everyone's opinion ? Will be on a 212 predator with header, kn filter and jet kit
 
pirranah

pirranah

New Member
#2
#2
I'm sure I'll catch flack, but proper gap and indexing will work wonders. NGK BPR6ES and you're good to go. I wouldn't buy into the "racing" hype.
 
OND

OND

#3
#3
Get the Autolite AR3910X spark plug no gap and no problems..I been using them for years and never had a problem yet. :thumbsup:
 
S

stargazer7467

Member
#5
#5
from what ive read on them they stick a little farther into the chamber, therefore raising compression a tad bit. Ive ran them in my GC160, GC190, and modded predator. The no gap and no indexing is just an extra plus.
 
Newoldstock

Newoldstock

New Member
#6
#6
No big gains to be made from a surface gap plug.
It can provide an advantage on the track but its a very small one.

Most of the time you are better off with a regular plug because they tend to burn off clean easier.

I have one of these race plugs in my bike right now and I can tell you its not doing me any favours, cold weather cold plug and some fouling.
If I were in the bush I would be in trouble because this is the wrongplug to run around and just ride on.
 
vwfan79

vwfan79

Active Member
#7
#7
I switched from the AR3910 plug to the AR3924, it is a copper plug with a higher heat range but still an autolite race plug. It is the equivalent to the BPR6ES, all of my motors are higher compression modded GX160s. The AR3910 is actually a relatively cold burning plug.
 
pirranah

pirranah

New Member
#8
#8
Newoldstock said:
No big gains to be made from a surface gap plug.
It can provide an advantage on the track but its a very small one.

Most of the time you are better off with a regular plug because they tend to burn off clean easier.

I have one of these race plugs in my bike right now and I can tell you its not doing me any favours, cold weather cold plug and some fouling.
If I were in the bush I would be in trouble because this is the wrongplug to run around and just ride on.
Click to expand...
My understanding is that's all the "racing" plugs are. Just a cooler running plug.

Plus it's not that hard to gap a plug so the whole no gap thing does nothing for me.
 
C

Camjamsdad

Active Member
#9
#9
stargazer7467 said:
from what ive read on them they stick a little farther into the chamber, therefore raising compression a tad bit.
Click to expand...
I can tell you with a shaved 14cc head the autolite plug is flush with the bottom of the head. The normal electrode plug protrudes down into the cylinder hitting the piston
 
astrowrench

astrowrench

Member
#11
#11
pirranah said:
My understanding is that's all the "racing" plugs are. Just a cooler running plug.

That statement is completely Wrong, Plugs can be gotten with any number of heat ranges,electrode style,material,diameter etc;and many other things,One of the biggest hypes is the E3 plug,to make it simple, Electricity takes the SHORTEST Path to ground ,so you could have 3 0r 37 grounding posts,closest one wins!AS far as the Autolite plug issue, the AR3910X is a racing plug,But in most instances it is too Cold; experience has taught me that a AR3932X is a better plug for our uses:- It is A Bit Hotter which helps with fouling,While warming up,Idling etc.I use them all the time;There are also Hotter, same style Autolites available,AR3934X etc.Finding them is the issue,BUT they are Cheaper than the 3910X's....The American way,supply,demand ,popularity UP Goes the Price Follows ....Just my 3 cents worth:shrug:
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