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Spark blowout?

8K views 23 replies 10 participants last post by  justinschmidt1  
#1 ·
So my tuner believes im getting spark plug blowout at high rpm when he turned the boost up today.

It was fine around 12-13 psi, made 530 rwhp, he turned it up to 15 psi and was blowing out I guess.

I wasnt there so I dont have sheets or anything, im assuming its not valve float at such low boost/ power anyway and they are supposed to be high pressure valvesprings anyway.

Should I upgrade to MSD coil packs or what?

The plugs are tr6's gapped around .028.....I have had problems with blowout before on my vortech setup at higher rpms, gapped the plugs down a bit and replaced with new ones and it went away but still seems like maybe my stock system is a bit old and tired.

They are stock coil packs and wires from 96. lol
 
#2 ·
I don't know a whole lot about the 96 coilpacks, but guys run significantly more HP on the stock COP's. .028" is pretty tight already though.
 
#3 ·
I would drop the gap down to 26. thats what i run mine at all the time with lower boost. I am running the screamin deamon coil packs and taylor thundervolt wires. I had a blow out problem at high rpms with the blower with the stock coil packs. but with the new ones everything seems to be ok.
 
#4 · (Edited)
Yea, I had a blow out problem come up with my blower as well, I just thought the plugs were old, swapped new ones in with a tighter gap and all was well.

Im gonna upgrade to screamin demon coils and some taylor wires though.

Its time to upgrade those components I guess....
 
#6 ·
Yeah my tuner said he sees less problems with the coil packs than the cop set up. You could probably get away with the coil packs and a set of motorsport wires. I just wanted the best when I replaced mine.

Sent from my DROID BIONIC using Tapatalk 2
 
#8 ·
The easiest thing to do to eliminate your spark blowout problem is to switch over to a non projected tip plug. Doing so cleared my spark blowout issues at higher RPM running the stock ignition setup and ~ 500rwhp. Non projected tip plugs are tailored specifically towards boosted applications and will allow you to run a larger gap without blowout issues.
 
#9 · (Edited)
Interesting, seems like everyone and their mom runs tr6's with no issues though.

Definitely something to consider though...im gonna see what happens when I replace the coil packs and wires...they are 15 years old so I figure its time to replace them anyway.

If I end up switching plugs i might do the BR6EF non projected tips
 
#10 ·
i run a COP conversion on my 98 gt with stock ford COPs. I run TR7s or BR7EF gapped at 25. only time i got blowout was at 24lbs of boost dropped to 22lbs and it went away.

alot of ppl i know and tuners ive talked to said to run the Tr7s but everyone has there own opinion.
 
#11 ·
COP's are typically far more capable (especially at higher RPM) than a single coil.

With that said, a recessed tip plug is still the way to go with F/I applications...especially on setups that weren't F/I from the factory. They will allow you to run a wider gap, especially when pushing your ignition setup to the limits. Because they don't protrude, they are far more resistant to fouling as well as pre-detonation.

Do you have to run them? Obviously no, but I would strongly encourage looking into it. Just because everyone and their brother runs a certain type doesn't make it the best overall choice for your application.

Just some food for thought. ;)
 
#24 ·
I actually picked up some of these to try out.

I dont really like how crooked the ground strap is on the tr6's when I gap them down so low and it seems like the non projected tip is the way to go with boost anyway.

Seems like non projected tip is the "right" plug even though everyone loves tr6's
 
#16 ·
Would double or triple tip plugs help with spark blowout? Im not even sure if they make colder plugs in double or triple tip though, just wondering.
 
#21 ·
lol, thanks but I have coil packs so its not really comparable to COP....im sure the stock packs would have worked if I knocked the gap down but figured I should upgrade the stuff since it was 15 years old.

200 bucks for wires and coil packs isnt that bad at all.
 
#22 ·
I run .017-.019 plug gap with no blow out issues ever. More gap will only make a little more power at lower rpms but nothing you will ever feel and not really see on dyno. Like 5 hp-10hp at most. Better ignition components always a plus but with boost drop your gap. .020-.025 is all you ever need to run with boost. When get over 15 psi drop gap under .020 and will be good. Go over 20 psi drop to .017 go 25-30 psi drop to .015 and 40 psi drop to .010-.012. Estamated gap guys will have to test to find your lucky gap for your setup.