Plugs

[Don W.]

Motor just clicked over 1000 mi on my rebuild. Pulled my plugs today and all was well except #6. Looks like it's getting a bit of oil but oil consumption since day one has been -0-. I'm thinking I'm just gonna put one step hotter in that hole and see what happens. No clue where this is coming from but of course it's either a valve seal or rings. Whatever it is it ain't much.

 

[sly dvl]

Re: Plugs

Are you sure that's oil? It's hard to tell from the pic but, oil usually leaves a build-up on the electrodes. That looks more like #6 is running a little rich.

 

[Don W.]

Re: Plugs

I suppose that's possible. Inj's are new from a known supplier on the board. Much as I don't like doing it I suppose I could swap a couple on that side and see if it follows. Fuel pressure holds good so I don't think there is any leak-down happening.

 

[sly dvl]

Re: Plugs

Were they flow matched? I know it's recommended that the rear cylinders get the higher flow inj's (if there are any) since they tend to run just a little hotter than the other cylinders.

 

[Don W.]

Re: Plugs

AFAIK yes. I'll check but it will take a few days.

 

[jwaller]

Re: Plugs

#6 usually runs fatter than most. I'd almost say its normal. if it makes you feel better try swapping that inj with another and see if it changes anything

 

[sly dvl]

Re: Plugs

I was always told that the rear cylinders (5 & 6) ran a little bit hotter (and therefore leaner) than the rest because of their location in the cooling system. That's why the higher flow #'s should be placed in those holes.
But you're saying that 5 & 6 runner richer? School me please....