stonemonk

iTrader: (12)

3 of the plugs that look rich were in the driver side and 2 of the plugs that look leaner were in the passenger side. my wideband is in the driver side reading rich, 10.9-11.1 which from looking at the plugs from that bank seems about right. however the passenger side plugs looking lean i dont quite understand? its a direct port kit and is jetted at 28n 16f @ 45lbs of fuel. Also timing is backed off 13 degrees, but another thing i was too sure of is why there appears to be 2 timing lines on the plug, wats that about?

BLK02WS6

iTrader: (2)

What do they look like on motor? You seem to have a fueling issue on one bank, but you need to figure out if it is in the rails/injectors or the DP...

ATVracr

iTrader: (5)

Pass. side runs hotter on every motor.

Pull 2* and lean it out.

stonemonk

iTrader: (12)

doesnt the pass side look lean already? ill pull 2 more degrees but it is running at 14 on that pass... pgs ae br8efs

stonemonk

iTrader: (12)

or is the pass side hot? not questioning ya at, jus want to understand

ATVracr

iTrader: (5)

I dont know what plugs are from what hole.

The last 2 pics look a little lean.

How did it run?

stonemonk

iTrader: (12)

seemed slow to me, was not at the track though. the leaner looking plugs are from pass side holes 2 and 4

ATVracr

iTrader: (5)

What did 6 & 8 look like?

So you made a pull on the street? How long? did you shut it off right away?

stonemonk

iTrader: (12)

6 looks exactly the same as 2 and ,4 didnt pull 8 yet, pass was through 2nd gear and pulled to 5500 rpm in 3rd, shut down immediately and coasted/pushed into the garage

ATVracr

iTrader: (5)

What the set up ? H/C ? 346?

250 shot might need a colder plug.
So you pulled 13*? pulled it from what (26*)?
or you have 13* in it?

Gary Z

Interesting question - here’s my theory: A timing mark is created on the ground strap at the point that is at the annealing temperature. Because the strap will always be hottest at the tip and cooler where it is anchored to the plug body, a timing mark can only appear at one point unless conditions change. The strap must have been heated to a point that created the mark nearer the body, cooled, and reheated to a (lower) point that created the mark nearer the tip.

stonemonk

iTrader: (12)

cam only ms3 cam stock bottom end, stand alone w/ c16 in it. 27* and have pulled 13 degrees, its running at 14*. which timing mark are u looking at? i see two and am unsure which to go by, there is a dark one about at the bend of the strap and another lighter mark that shows up on all driver side bank plugs that stops on the top of the strap on the passenger side it looks like the lighter mark would be running off the strap of the plug

stonemonk

iTrader: (12)

like possibly a shift? i did shift it and then not pull it through the entire rpm range...?

Gary Z

This could be the cause. Plug reading assumes shutoff after running at WOT long enough to reach steady-state conditions. Plugs may look different after, say 4 seconds at WOT than after only 2 seconds.

stonemonk

iTrader: (12)

hmm, if thats the case which mark would u go by?

ATVracr

iTrader: (5)

Right on.

The jetting is in the ball park.
I would pull 2* out and take it to the track and make some hits.
Start with 1/8th mile and work up to 1/4 mile checking plugs along the way.

Few years back I had a wet fogger on the car with 28/16 jeting and it was VERY rich at 60psi which is why I say your in the ball park with it at 45psi.

stonemonk

iTrader: (12)

sounds like a plan, on the street is just too hard to tune a car safely.... prob gettin to the track next weekend. i was considering droppin fuel pressure to 40 inorder to lean it out a bit and ill try pullin 2* also. maybe i shuld up the jetting on the passenger side? im alil worried as to how they looked compared to the driver side... or shuld i leave it alone?

Gary Z

You shouldn't try to interpret mysterious plugs. Check plugs after a clean, complete pass.

ATVracr

iTrader: (5)

Bring the jets with you and you can make that call at the track after the 1st pass.

Firehawk441

iTrader: (41)

I would start by stepping the fuel jets up to 24 and drop your fuel pressure to around 6 psi.(Flowing Pressure).Tuning with high pressure and using tiny little fuel jets is a PITA.