Mopar Muscle Association UK

These are from my last run , a much more aggresive tune than Nos reccomends for there cheater plate running 150 horses.

The fuel jet on this run was two steps smaller than the jet chart from Nos , fuel pressure as per chart.

Plugs are numbered from left to right , lost number 8 plug , so put a pic of a new one out the box.

These plugs were idled off the track back to the pits , so a slight discolour on the top of porcelaine.

Plugs are pig rich appart from No 4 , must be some kind of blockage on the fuel spray bar holes around no 4 runner , anyhow , i think something is amiss somewhere. Timing mark looks pretty good on the ground strap , but a little too much on No 4 cylinder.

No 4 plug looks pretty good as far as tune up goes , but don't wanna lean out anymore to bring the rest of the cylinders in line.

Gonna swap the cheater plate for an NX twin Gemini plate , hopefully the tune might balance out a bit better.

Looks like a lot more could've been had with a bit more tuning , but can't take the risk on No 4 leaning out.

Any more ideas on No 4 cylinder being sooooooooo lean compared to the rest? , will do a run NA & check plugs , will tell me if there's a problem when off the bottle.

Compression ? losing a lobe on the cam on exhaust side, header tube more restrictive, not letting out previous charge, rogue plug??

Fuel puddling in inlet runners?

sorry adam but that lot look like shrapnel to me, what sort off Bananarama! plugs are they ????

Cannonball wrote:sorry adam but that lot look like shrapnel to me, what sort off Bananarama! plugs are they ????

Look like Italian 13 Amps to me

Cannonball wrote:sorry adam but that lot look like shrapnel to me, what sort off Bananarama! plugs are they ????

Normal NGK plugs Dunc , just using 8s instead of 6s.

Only cut the threads off , same as any other plug.

Edit...Using eddy heads.

NGK, eeek, put some Densos in next time

WillDatsun wrote:NGK, eeek, put some Densos in next time

They might sound good Will , but if you loose a ground strap with irridium plugs you can kiss good bye to the piston , also difficult to read the timing mark on the strap.

Brutus wrote:

Cannonball wrote:sorry adam but that lot look like shrapnel to me, what sort off Bananarama! plugs are they ????

Normal NGK plugs Dunc , just using 8s instead of 6s.

Only cut the threads off , same as any other plug.

Edit...Using eddy heads.

Think I used to run NGK B8ES in my B1, will check ,later. I found them to be a good plug, never had any issues which were down to them.

Adam could be a weak spring on the inlet valve will be interesting to see what a difference you get with the NX set up?
If its the same then you should tune to the No 4 cylinder to play safe until you find the reason for the unequal mix in 4 cylinder.
BTW I have heard of chopping plugs but that's classic

right ok mate i have never seen a plug disected like that, ring bloody roger luty up them surrey boys know this nitrous lark

Knightcharger wrote:Adam could be a weak spring on the inlet valve will be interesting to see what a difference you get with the NX set up?
If its the same then you should tune to the No 4 cylinder to play safe until you find the reason for the unequal mix in 4 cylinder.
BTW I have heard of chopping plugs but that's classic

We talked about this on saturday , do you remmember?

Yea Bob , gonna tune for that cylinder , got a feeling it's the plate , will spray the plate into a bucket & see from there.

Pulled 1.5* per 50 shot , would of liked to of seen the results of the tune if all went well , could've pulled another 1.5lb of fuel pressure me thinks.

Cannonball wrote:right ok mate i have never seen a plug disected like that, ring bloody roger luty up them surrey boys know this nitrous lark

Dunc this is the only way to tune a nitrous run motor , did'nt cut & burn me fingers for nothing.

Always open for advice , that's why i put this post up.

Adam,
What springs you running ?
Double/Triple ?
Poundage ?
Cam Lift/ seperation ?

mopar_mark wrote:Adam,
What springs you running ?
Double/Triple ?
Poundage ?
Cam Lift/ seperation ?

Don't know from memory , but the LSA is too tight for nitrous (108) , should be running @ least 112/114 , probably goin straight out the EX valve.

Prob need to change the vertor too , seems to be blowing right through it.

Motor was'nt built for nitrous , only thougt about cheetin after it was built.