13 ram nitrous backfiring

california · Jan 29, 2017

so this just happened

first pull with 150shot 100octane launch of the hole real good
air to fuel ratio 10.9 11.2 11.5

second pull 150shot 100octane sprayed of the hole changed the gas jetting from 28 to 24 air to fuel ratio 12.2 11.9 11.5 11 2

third pulls before launching was preepin heating up my tires when heating up my tires. it was backfiring from the exhaust with nitrous off, everything off just heating up so i launched with nos off just to see if it kept doin it it backed fired loud came driving home slowly backfired couple time in betweeen gears did i **** up my engine.

check engine light came on
p0307 cylinder 7 misfire detected

so i digged into my plugs and this is what i found

using a air to fuel ratio wideband on 150 shot what is consider rich and what is consider lean ive been hearing all kinds off numbers im just confused right now what are the numbers im suppose to see on the wideband with 150shot with 85mm hemi plate system n20?

i will replace those 2 plugs this morning hopefully it didnt damage no internals

california · Jan 29, 2017

and this is the location of my wideband 02sensor just to make sure my readings are correct

i have long tubes so right behind the front 02 sensor behind the collector and right before the cats

Dangulo · Jan 29, 2017

Compression test all the cyl's

shane1981 · Jan 29, 2017

12.2 is ok . for best results and saftey its 11.4 to 11.8 as far as the backfire im not sure .i get a small back fire after i let off the spray but have heard its common on the bigger shots like 100 and above. ive had no issues with mine at all .

tuned by Jay Greene

shane1981 · Jan 29, 2017

it could be that zero plug gap you have in the pic, and did you get it tuned for the nitrous and did you get colder plugs?

tuned by Jay Greene

california · Jan 29, 2017

yes one step colder plugs denso 3381
nitrous tune for 91 octane 15o shot 100 shot and
nitrous tune for 100octane 150 shot and 100 shot

replaced the plugs test ran it go back home backfiring at idle
threw oil out from the oil breather right below the oil cap...

left in on for a few minutes idling white smoke everywhere

most likely piston is out

charonblk07 · Jan 30, 2017

I would definitely pull the head before you do anything else. Those plugs look like they had something rattling around in the cylinder with them; I can't say what it was but you wouldn't be the first to pop the upper ring land on the hypereutectoid pistons.

hemi_loredo03 · Jan 31, 2017

Have you checked all the plugs or just the two?

charonblk07 said:
I would definitely pull the head before you do anything else. Those plugs look like they had something rattling around in the cylinder with them; I can't say what it was but you wouldn't be the first to pop the upper ring land on the hypereutectoid pistons.

I agree, you might have popped a ring on the piston.

BigSloth · Jan 31, 2017

Well, unless you put them in with no gap, or dropped them on the tip while removing, something has hammered your spark plug gap together. Looks like that same something has also pitted the ground strap by being jammed into it. The white smoke seals the deal. More than likely you've had the top of piston #7 come apart on you, and get mashed up into aluminum gravel.

As for what caused the failure it's hard to say. None of the numbers you posted should cause any problems. 12.2 is not too lean at all.

Time to pull the head or get a boroscope down the spark tube and take a look at that piston.

california · Feb 7, 2017

found my problem

california · Feb 7, 2017

driver side cylinder 7 is a goner
noticed on passenger head one of the piston was broken as well

when i removed heads i saw driver s side was damaged as you guys can see on the picture so that means i need a mee head?

now that i know my problems time to start looking into a stroker
what do you guys reccomend 392 400 or a 410 stroker block for the 5.7

what companies are good

if head is gone if i get another one what can i do to my heads besided just getting them ported if i were to go with one of those strokers mentioned above ?

what kind of cam and from who want to know everybit of info before pulling the trigger

how many shot of nos can one of this strokers handle without puttinf munch in risk?

or how about swapping the 5.7 with a used 6.4 is it possible if it is what exactly need to be done to get it to work?

california · Feb 7, 2017

Andrew09HEMI · Feb 7, 2017

Call Arrington or one of the several Hemi builders google will populate and tell them exactly what you're looking for. They will tell you and build you that exact motor.

charonblk07 · Feb 7, 2017

Forged strokers can handle all the nitrous you can throw at it, the trick is building a system that can deliver it equally to the cylinders. For basic systems a 175 shot is their maximum, add a stage to get another 50 but after that you seriously need to be thinking about a properly built nitrous system that's either direct port or a nitrous puck/bar with solenoids that can flow the required volumes.

For the engine, the largest I always recommend for the 5.7L block is a 392 if you're running nitrous or boost because the pistons can start rocking in the bore at max travel when the lower skirt is unsupported with the increased cylinder pressure. The good news is the 6.4L block is a direct drop-in so you can start with 392cuin and go up from there if you want to go bigger. The 6.4L pistons are still weak hypereutectoid pistons so you'd want to at least swap them out for forged ones and there are drop in pistons to do that. For cams, you want to talk with Dave @ Modern Muscle or Jay Greene if you want to build a nitrous specific engine, you don't want a lot of overlap with nitrous.

Wild one · Feb 7, 2017

california said:
driver side cylinder 7 is a goner
noticed on passenger head one of the piston was broken as well

when i removed heads i saw driver s side was damaged as you guys can see on the picture so that means i need a mee head?

now that i know my problems time to start looking into a stroker
what do you guys reccomend 392 400 or a 410 stroker block for the 5.7

what companies are good

if head is gone if i get another one what can i do to my heads besided just getting them ported if i were to go with one of those strokers mentioned above ?

what kind of cam and from who want to know everybit of info before pulling the trigger

how many shot of nos can one of this strokers handle without puttinf munch in risk?

or how about swapping the 5.7 with a used 6.4 is it possible if it is what exactly need to be done to get it to work?

Have you taken a look at Edlebrocks replacement heads. They apparently flow pretty decent.They're also coming out with a replacement intake that might interest you to.

california · Feb 7, 2017

charonblk07 said:
Forged strokers can handle all the nitrous you can throw at it, the trick is building a system that can deliver it equally to the cylinders. For basic systems a 175 shot is their maximum, add a stage to get another 50 but after that you seriously need to be thinking about a properly built nitrous system that's either direct port or a nitrous puck/bar with solenoids that can flow the required volumes.

For the engine, the largest I always recommend for the 5.7L block is a 392 if you're running nitrous or boost because the pistons can start rocking in the bore at max travel when the lower skirt is unsupported with the increased cylinder pressure. The good news is the 6.4L block is a direct drop-in so you can start with 392cuin and go up from there if you want to go bigger. The 6.4L pistons are still weak hypereutectoid pistons so you'd want to at least swap them out for forged ones and there are drop in pistons to do that. For cams, you want to talk with Dave @ Modern Muscle or Jay Greene if you want to build a nitrous specific engine, you don't want a lot of overlap with nitrous.

so your telling me the 6.4 hemi engine fits on our trucks ? if yes what exactly do i need what need to be modified etc to make it work .... if its to kuch of a pain ill. just keep looking at the 5.7 392 or 5.7400 with a custom cam .

charonblk07 · Feb 8, 2017

california said:
so your telling me the 6.4 hemi engine fits on our trucks ? if yes what exactly do i need what need to be modified etc to make it work .... if its to kuch of a pain ill. just keep looking at the 5.7 392 or 5.7400 with a custom cam .

I'm actually going through this with another member atm. The block drops right in place, and you'll need to extend a few sensor wires, use the truck's assessories and timing cover, oil pan, and you'll need to tune for it of course. All external dimensions of the 6.4L are identical to the 5.7L including exhaust port location and shape. There are differences in cams between the car and truck but I'd recommend getting a custom cam if you decide to do the swap.

california · Feb 8, 2017

charonblk07 said:
I'm actually going through this with another member atm. The block drops right in place, and you'll need to extend a few sensor wires, use the truck's assessories and timing cover, oil pan, and you'll need to tune for it of course. All external dimensions of the 6.4L are identical to the 5.7L including exhaust port location and shape. There are differences in cams between the car and truck but I'd recommend getting a custom cam if you decide to do the swap.

i would like to know a little more info on this swap
i could use my own harness from my 5.7 or would i need the 6.4 harness? computer ? how about my headers would meed to swap then out the same goes for my nitrous system? and transmission stays the same or whats the deal with that????

what year make and model 6.4 do you reccommentd? challenger jeep srt8 etc what year?

13 ram nitrous backfiring

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