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Sun Jul 17, 2016 10:05 pm

What do you guys think of this burn on the plugs? 2017 on dual webers.

Two richer ones are from right side, two leaner ones are on left side. Thinking right side should be leaned out a bit.

Getting pops under acceleration after about 20 min of continuous drive.

Sun Jul 17, 2016 10:10 pm

Slightly warm. Id try a Colder plug.

Sun Jul 17, 2016 10:10 pm

Probably it's the lean side that's causing the pops! Mine at 15000 miles: #3 Spark Plug

Mon Jul 18, 2016 9:01 am

Jfats why do you think a colder plug? NGK B5ES are in there now.

Black carbon around base of plug look good?

Mon Jul 18, 2016 9:53 am

I agree, try a NGK "6".

Mon Jul 18, 2016 9:55 am

The prong strap itself shows how hot (or cold) your plug is by the heat transfer mark on the strap. From the firing end to abouts halfway is considered with in heat range. Too close to the tip is cold, too warm is close to the strap base.
I used to have a saved page on my phone with sites on reading plugs and t -mobile did some upgrade and I can't find it now.

Mon Jul 18, 2016 11:02 am

Gotcha both...thanks.

Should I do any leaning or fattening on either side giving the difference in color, or just put plugs in and try again before I touch anything else?

Mon Jul 18, 2016 11:50 am

do plugs first.

Trying to read plugs with unleaded fuel is mostly a waste of time. Plugs don't color well with unleaded.

Mon Jul 18, 2016 2:05 pm

I agree wong plug range. pop's are usualy leen condition. check float level's and carb sync.

Mon Jul 18, 2016 3:22 pm

The owner of my local Napa suggested the B6HS as the old plug seem to be sticking several threads into the cylinder. Thoughts?

Mon Jul 18, 2016 3:37 pm

Oh my what an issue you are in now. do you know anything about the heads? You sure don't want to have the plug hitting the cylinder top.
My opinion on the plugs is they are really close to the correct range. With no lead in the fuel anymore the plugs stay clean.

Mon Jul 18, 2016 4:07 pm

The old plugs is what came in the motor from Chico Performance. They seem to clear the piston, but you can see several of the threads appearing to be sticking out into the head with the darker build up.

I can either go back to the same long ones one step colder or use these shorter ones.

Mon Jul 18, 2016 4:11 pm

make sure the plugs match the heads.

Also, do not under ANY circumstances, use never-seize. I see some on your plug threads, that is not good in my experience.

Mon Jul 18, 2016 5:35 pm

[email protected] wrote: make sure the plugs match the heads.

Also, do not under ANY circumstances, use never-seize. I see some on your plug threads, that is not good in my experience. ditto x4

Mon Jul 18, 2016 5:56 pm

[email protected] wrote: make sure the plugs match the heads.

Also, do not under ANY circumstances, use never-seize. I see some on your plug threads, that is not good in my experience.

I have used "anti" seize on all alluminum heads since 1984 with zero problems, the only times I have seen problems is when plugs were installed dry. Just currious as why you say not to use it?

Mon Jul 18, 2016 6:21 pm

[email protected] wrote: make sure the plugs match the heads.

Also, do not under ANY circumstances, use never-seize. I see some on your plug threads, that is not good in my experience.

How can I check if they match the head? I am looking at the old plug and see that at least 3 of the threads have black carbon on them, so assuming they are protruding out. If installed put those plugs in, should I assume they are right, or go shorter?

Mon Jul 18, 2016 6:57 pm

I think the easiest way to see if your heads are for long reach plugs is to take a piece of wire and bend it like a hook, mark with a marker at the top of the plug hole and compare it with the plug itself.

Mon Jul 18, 2016 7:43 pm

I can't even count how many times I've seen mysterious misfires cleared up when it was removed. At least over 100x.

mcmscott wrote: [email protected] wrote: make sure the plugs match the heads.

Also, do not under ANY circumstances, use never-seize. I see some on your plug threads, that is not good in my experience.

I have used "anti" seize on all alluminum heads since 1984 with zero problems, the only times I have seen problems is when plugs were installed dry. Just currious as why you say not to use it?

Mon Jul 18, 2016 8:45 pm

:idea: NGK BP6HS or BP7HS (latter in my Turbo bug)

Tue Jul 19, 2016 11:09 am

I would put bosche platinums in it.