bluethunder364

iTrader: (5)

What is the prefered plug that most people run? and gap .

Thanks

xpndbl3

iTrader: (23)

tr6 and .035

GC99TA

iTrader: (30)

I would say it depends on a few things. Is this NA or are you going to spray it regularly with a small shot? What static and/or dynamic compression ratio? I started with TR6's gaped to .035 in my LY6 6.0L, which is only 9.67:1 static compression (7.25 dynamic). I did this because I'm eventually gonna be spraying it with a small shot and wanted to run the colder plugs all the time. But, the plugs quickly fouled out due to a lack of heat in the plugs (presumably due to lack of compression). I switch to TR5's gapped to the same and the plugs stay clean all the time. Some may say that my carb'd tune is just too rich at idle and fouled the TR6's. This COULD be true as I haven't tuned it with a wideband, but if I set it up any leaner than it already is, the car wants to die when I let off the throttle after a WOT run. So, I'd say it idles pretty cleanly.

Now, in my 11.0:1 LS1 (injected) I run TR6's full time with no problems at all. Again, it may be the "cleaner" idle of the injection, but I think it has more to do with heat (cylinder pression) in the chambers. Just my $.02.

bluethunder364

iTrader: (5)

Thanks for the info

TJ

iTrader: (10)

autolite 605 for motor. 103 if you spray.

speedtigger

iTrader: (16)

Tr6 stay clean in my 243 headed lq9 at 10.9:1. I would imagine an lq4 with stock compression would do better with Tr5.

trbolssln0522

iTrader: (4)

I wouldn't run a TR6 plug unless the engine is seeing nitrous or boost. That one heat range colder will lose power on a naturally aspirated application. The .035 gap is great for running a 100-150 shot or 8-12 pounds of boost. If running N/A, run an NGK TR-55 and gap it to .055. These are very cheap in price about $23 bucks and work well. If you want to go with an iridium run the NGK-TR5IX or NGK-TR55IX. The only difference is the gap between the two. The TR5-IX is gapped at .045 (for better idle quality), and the TR55-IX is gapped at .055 (slightly better performance). I personally like the iridiums due to the prolonged life of the plug and the ultra fine electrode, however they are pricey at around $100.00.

speedtigger

iTrader: (16)

This is interesting. The Autolite engineer said that on a race engine, run the coldest plug you can that will keep itself clean and not foul.

trbolssln0522

iTrader: (4)

For a race engine, running a colder plug is a good idea since it prevents detonation. Race engines have higher compression ratio's and more internal combustion heat, so that would be a good choice. I always keep the "factory" heat range for a plug unless the engine has extensive modifications, such as something that would rapidly increase combustion temperature. In a carbed 6.0, assuming he has mods like heads and cam and not an outrageous compression ratio, a factory heat range would work great. The Autolite engineer has a great point since the window of reference is to run a plug not to hot so it will detonate, but not to cold where it will foul. This happy medium is what they call the thermal performance.

bttlfed

I run tr5 at .055 gap on motor and it idles/runs great. I spray a 150 and use br7ef with .030 gap. However minus the idle quality the br7ef run the same 1/4 mile on motor as do the tr5 in my setup.

trbolssln0522

iTrader: (4)

The BR7EF is a great plug however it is 2 heat ranges colder then factory, and one heat range colder then the TR6. Every motor that I run over 17psi I use the BR7EF. I'm very surprised that you are able to run the same quarter mile with the BR7EF's as you would with the TR5, especially with two heat ranges between them, maybe you put more timing in?? I've ran a 150 shot wet kit on my GTO with the TR6 and a .035 gap. The idle quality was good with absolutely no issues in spark blow out, the plugs were also very clean with no hot spots.

ZONES89RS

iTrader: (25)

My 6.0 runs great with BR7EFs on motor, but now the dope is off,a TR6 will go back in. TR6 are great for a cammed LS, otherwise, they are not a good nitrous plug, not saying they wont work, i have sprayed TR5s, but that doesnt make it OK. Any projected tip plug should be left for motor, the BR7 is a non projected tip, great for gas, boost, ect.

TJ

iTrader: (10)

br6ef is a great plug to run on motor if you are looking for non projected. they dont stay as clean at idle as a projected tip.

Paul57

If you are running too hot of a plug, will you get spark knock/detonation to let you know before a major melt down??

ZONES89RS

iTrader: (25)

That is why i use a TR6, the BR6 is great for a all motor car that doesnt need race fuel that wont see street use.

1badeagle

iTrader: (9)

I run the tr6 gapped at .037 in my nitrous fed 370 11:1 comp.

TJ

iTrader: (10)

projected plugs and nitrous dont belong. i have no idea why everyone on this forum uses this plug with nitrous..

1badeagle

iTrader: (9)

I use what works good. 6000 miles and not a single problem.

bttlfed

Well it must have been the air quality. I did make a pass with the tr5 gapped at .055 and the car picked up .2 over the br7ef. It was the middle of summer when I made the motor passes on the br7ef where I didn't see a change. I am running 31* and pulling 6* for the n2o. I do however run 110 to play it safe. The br7ef are gapped at .030