Plugs telling a story

Ivor · Post by **Ivor** » Mon Jun 02, 08 10:57 pm

My first port of call would be to do a compression check, then do a plug cut without the squirt and see if number four is still lean.

Other than that it's the plate in the bucket job, by the sounds of it!

Got to admit, I'm not planning to use gas, but it's fascinating reading your threads Adam

mopar_mark · Post by **mopar_mark** » Mon Jun 02, 08 11:06 pm

Nitrous Converters are a different animal, as most converters are specd on weight HP & Torque. Adding Nitrous adds another dimension.

My understanding for Nitrous cams is that you want less of an overlap & high lift & longer duration on the exhaust . As with nitrous you have more gases to get out,

Anonymous · Post by **Anonymous** » Mon Jun 02, 08 11:07 pm

Thanks Ivor.

If no 4 was running rich & the rest lean , then maybe i would be thinking of a lifted ring land on No 4, bearing in mind this motor has run rich many times on the bottle , i can't see all 7 have any problems.

Will run NA & chop the plugs , prob do this down the M1.

I'm hoping it's the plate , will investigate tommorow.

Thanks for all the input , i'm sure we'll sort it with all the info coming.

Anonymous · Post by **Anonymous** » Mon Jun 02, 08 11:09 pm

mopar_mark wrote:
My understanding for Nitrous cams is that you want less of an overlap & high lift & longer duration on the exhaust . As with nitrous you have more gases to get out,

Spot on Mark , all good info.

By the look of those plugs , i'm between the devil & the sea , if i run with that tune i take the risk of lifting the lands , so until the rest of me NX kit arrives , no gas for me.

Scooby · Post by **Scooby** » Mon Jun 02, 08 11:22 pm

Ad,mate I am getting a bit worried about you...cutting the end of spark plugs....
Is there a doctor in the house....Sure you can explain your reasons to me on Wednesday..(Hot Rod Night)

Only messing mate.
Rich..

newport100 · Post by **newport100** » Mon Jun 02, 08 11:31 pm

Is it??
Might have some of that!!

Anonymous · Post by **Anonymous** » Tue Jun 03, 08 10:14 am

TerryR wrote:stop leaning it out before you really hurt it ,better a bit rich than too lean

Noooooo

90 percent of nitrous failures are due to bein too rich as opposed to lean , what happens is the fuel sits behind the top ring , fires off & lifts the land, also pinches the second ring , this allows oil into the combustion chamber & BOOM , hole in piston , take a look the pistons that are not destroyed & they will tell the story.

Next time you think your on the edge of your'e tune , cut the plug up & have a looksie @ the fuel ring , bet you have a fair bit of tuning left in there.

mopar_mark · Post by **mopar_mark** » Tue Jun 03, 08 3:48 pm

Brutus wrote:
TerryR wrote:stop leaning it out before you really hurt it ,better a bit rich than too lean
Noooooo

90 percent of nitrous failures are due to bein too rich as opposed to lean , what happens is the fuel sits behind the top ring , fires off & lifts the land, also pinches the second ring , this allows oil into the combustion chamber & BOOM , hole in piston , take a look the pistons that are not destroyed & they will tell the story.

Next time you think your on the edge of your'e tune , cut the plug up & have a looksie @ the fuel ring , bet you have a fair bit of tuning left in there.

Adam,
Thats 100% percent correct, based on what I have read & been told. The " too lean" scenario seems to be reminants of the old days when people were 1st learning to deal with Nitrous & not fully understanding the cause.

The guy I know who is a track side representative for NOS company in US & advisor for a lot of Nitrous Pro Mod teams, is always telling the same story as you have written.
He is always moaning about suppliers selling Nitrous kits, with base set up too rich & associated problems

Anonymous · Post by **Anonymous** » Tue Jun 03, 08 5:18 pm

Thanks Mark , @ least that's two of us talkin BS.

Take a look @ the compression height of my motor , around 2.1 , probably been gettin away with running pretty rich , now take a look @ a stroker piston , around 1.3 CH , put too much fuel behind the rings & it will peel the top of the piston back around the valve reliefs like a sardine can.

We all have different tuning methods , eventually maybe failure , but i'm sticking with the tune whereby i think the motor will live a little longer.

Ivor · Post by **Ivor** » Tue Jun 03, 08 5:22 pm

Well I'm sorry to disappoint you Adam, but I'm sticking with plain old pump gas in my new stroker motor...you've definitely scared me to death with nitrous!

Anonymous · Post by **Anonymous** » Tue Jun 03, 08 5:44 pm

Nitrous is a steep learning curve , like the magic circle i spose , won't be posting me tune ups when i get to that point , cos i'll probably get shot.

Sorry , keep forgetting , this is a NA site , no time for forced induction.

Pete · Post by **Pete** » Tue Jun 03, 08 6:01 pm

Next step - Supercharging!!! Always fancied a blower on a car

Won't be at the level of Mark, though....

Anonymous · Post by **Anonymous** » Tue Jun 03, 08 6:02 pm

Mark , is the guy you're refering to Monty Smith?

Read some articles written by Monty , one clever guy.

What i don't understand is if Monty Smith works for Nos , why do they sell there products soooooooo rich out the box , EVERY motor has to lean out when using Nos products , so it has nothing to do with 'eiring for caution'.

Take an NX plate , most guys & i know of a few , would have a heart attack running those plates with NX tunes.

Anonymous · Post by **Anonymous** » Tue Jun 03, 08 8:36 pm

Adam I think you should translate all this nitrous speak?
NX, NA, CH, BS,?
mind you I do understand BOOM

Mopar Muscle Association UK

Plugs telling a story

Nitrous speak