May Day !! Down a cylinder
 

Alright class racer mechanics. I need some help. I am down a cylinder. Nber 7 keeps fouling plug. I have changed plugs wire cap dist. I did a leak down got about 1 percent leakage. Compression is 165lbs all cylinders I pulled the intake and fitted it last night.
I connected a plug to wire and it is firing at the cylinder.
The cam loves and lifters are fine.

Any idea?? There is several of us scratching our heads on this one.

I put 170 lbs air straight to cylinder it ha no leakage out valves

Re: May Day !! Down a cylinder
 

Intake valve guide or seal on that cylinder. Sounds like a properly sealed engine. If the intake or heads were very mismatched, it would have affected other cylinders as well.

Re: May Day !! Down a cylinder
 

Sounds like a leaky valve guide, you could put a little hotter spark plug in that cylinder to burn off the oil.

Re: May Day !! Down a cylinder
 

Chuck we changed plugs and wires several times. I am thinking guide but if guide was wore it would show in leak down?
This is the new head we did fix. I busted one at gators.
Mb is gonna post up pic of plugs for me. I sent him pic of 1 and 7 plug so y'all could see

Re: May Day !! Down a cylinder
 

Running with a temp gun number 7 never gets within 200 degrees of other cylinders.

Re: May Day !! Down a cylinder
 

Posting for Phil:
https://fbcdn-sphotos-d-a.akamaihd.n...85858693_n.jpg

Re: May Day !! Down a cylinder
 

Thanks Michael. That is 1 and 7 plug I changed number 7 that is one run on that plug.

Re: May Day !! Down a cylinder
 

Does your cam have any of the cylinders swapped? I had two plug wires swapped on the dyno and the engine sounded decent but kept fouling out a plug. Also, what kind of top piston ring are you running? My plugs looked like that all the time when I ran a gapless top.

Re: May Day !! Down a cylinder
 

Cam is norm firing order. All plugs look like 1 except 7. 7 doesn't never get hot like the rest. Head scratcher I have wore bald spots in my head since Friday.

Re: May Day !! Down a cylinder
 

Give me your phone number so we can talk about it, PM or otherwise! Rick Brown