Add me to the #4 list
06-04-2007, 02:31 PM
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Add me to the #4 list
Its official my number 4 piston is shot. It showed 80% leakdown while all others were perfect. The compression ratio was 1-165 2-165 3-165 4-100
new motor time
mods were intake, catback exhaust, cobra h/e, 2.7 pulley at 19 lbs, 60lbers.
new motor time
mods were intake, catback exhaust, cobra h/e, 2.7 pulley at 19 lbs, 60lbers.
06-04-2007, 02:35 PM
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just compression test, its 8 hours to pull the head off and 27 to rebuild not including fabbing.... its only 13 to drop a new one in... im just replacing it.
06-04-2007, 03:44 PM
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How long have you been running it blown, did you notice a huge difference?
You and I got the Intense Stage 4 around the same time, now I'm starting to question my engine. I ran the 2.5"pulley with no cooling mods for a year straight, I know I know not good. Now i have a 2.7" on, runs like usual but I'm tired of worrying about it. I'm having mine checked, and will be downgrading to GM Stage 3.
Good Luck with the rebuild.
You and I got the Intense Stage 4 around the same time, now I'm starting to question my engine. I ran the 2.5"pulley with no cooling mods for a year straight, I know I know not good. Now i have a 2.7" on, runs like usual but I'm tired of worrying about it. I'm having mine checked, and will be downgrading to GM Stage 3.
Good Luck with the rebuild.
06-04-2007, 03:51 PM
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How long have you been running it blown, did you notice a huge difference?
You and I got the Intense Stage 4 around the same time, now I'm starting to question my engine. I ran the 2.5"pulley with no cooling mods for a year straight, I know I know not good. Now i have a 2.7" on, runs like usual but I'm tired of worrying about it. I'm having mine checked, and will be downgrading to GM Stage 3.
Good Luck with the rebuild.
You and I got the Intense Stage 4 around the same time, now I'm starting to question my engine. I ran the 2.5"pulley with no cooling mods for a year straight, I know I know not good. Now i have a 2.7" on, runs like usual but I'm tired of worrying about it. I'm having mine checked, and will be downgrading to GM Stage 3.
Good Luck with the rebuild.
How long have you been running it blown, did you notice a huge difference?
You and I got the Intense Stage 4 around the same time, now I'm starting to question my engine. I ran the 2.5"pulley with no cooling mods for a year straight, I know I know not good. Now i have a 2.7" on, runs like usual but I'm tired of worrying about it. I'm having mine checked, and will be downgrading to GM Stage 3.
Good Luck with the rebuild.
You and I got the Intense Stage 4 around the same time, now I'm starting to question my engine. I ran the 2.5"pulley with no cooling mods for a year straight, I know I know not good. Now i have a 2.7" on, runs like usual but I'm tired of worrying about it. I'm having mine checked, and will be downgrading to GM Stage 3.
Good Luck with the rebuild.
by the way this is exactly what happend to me.... it felt great until 8 months or so then it ran good, but i got weary about getting on it etc. im not sure why it just didnt feel right, now this... downgrade why u still can!
Last edited by CobaltBurst; 06-04-2007 at 03:51 PM. Reason: Automerged Doublepost
just do it yourself, its easy to do! i thought it was gonna be harder than it was!
06-04-2007, 04:27 PM
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i really dont have the time it took me 2 months just to get a compression check done. My job has me traveling alot etc.... its just going to sit while i save... not sure my exact a/f but it was in the green meaning not bad...
06-04-2007, 04:55 PM
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constant Knock day in and day out is what weaken these motors out...until they die all together.
I noticed if you run a 2.6" pulley and max boost is 18-19PSI and you set hptuners to run it a 85-90% 4000RPM and up it bring the boost down to around 16.2-17PSI so it would look like this:
from 1000rpm to 4000rpm (using MAX torque of the 2.6" pulley) then from 4100rpm to 7000rpm limit boost to 16.2-17PSI you can run more TIMING (which in our motor makes more power then additional boost) and create less HEAT, less fuel demand, On the dyno PEAK torque with a 2.6" is around 4000rpm and 4400rpm so no need for more boost anyways.
Im still working on this but so far I have been blown away on how much better the car runs no knock ever.
With my water and meth kit on it acts like an insurance policy on the motor!!
I noticed if you run a 2.6" pulley and max boost is 18-19PSI and you set hptuners to run it a 85-90% 4000RPM and up it bring the boost down to around 16.2-17PSI so it would look like this:
from 1000rpm to 4000rpm (using MAX torque of the 2.6" pulley) then from 4100rpm to 7000rpm limit boost to 16.2-17PSI you can run more TIMING (which in our motor makes more power then additional boost) and create less HEAT, less fuel demand, On the dyno PEAK torque with a 2.6" is around 4000rpm and 4400rpm so no need for more boost anyways.
Im still working on this but so far I have been blown away on how much better the car runs no knock ever.
With my water and meth kit on it acts like an insurance policy on the motor!!
06-04-2007, 05:20 PM
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constant Knock day in and day out is what weaken these motors out...until they die all together.
I noticed if you run a 2.6" pulley and max boost is 18-19PSI and you set hptuners to run it a 85-90% 4000RPM and up it bring the boost down to around 16.2-17PSI so it would look like this:
from 1000rpm to 4000rpm (using MAX torque of the 2.6" pulley) then from 4100rpm to 7000rpm limit boost to 16.2-17PSI you can run more TIMING (which in our motor makes more power then additional boost) and create less HEAT, less fuel demand, On the dyno PEAK torque with a 2.6" is around 4000rpm and 4400rpm so no need for more boost anyways.
Im still working on this but so far I have been blown away on how much better the car runs no knock ever.
With my water and meth kit on it acts like an insurance policy on the motor!!
I noticed if you run a 2.6" pulley and max boost is 18-19PSI and you set hptuners to run it a 85-90% 4000RPM and up it bring the boost down to around 16.2-17PSI so it would look like this:
from 1000rpm to 4000rpm (using MAX torque of the 2.6" pulley) then from 4100rpm to 7000rpm limit boost to 16.2-17PSI you can run more TIMING (which in our motor makes more power then additional boost) and create less HEAT, less fuel demand, On the dyno PEAK torque with a 2.6" is around 4000rpm and 4400rpm so no need for more boost anyways.
Im still working on this but so far I have been blown away on how much better the car runs no knock ever.
With my water and meth kit on it acts like an insurance policy on the motor!!
This is very interesting.....I don't see it in your tune. The variable must have been a mechanical item. I know you didn't beat on it.
06-04-2007, 05:35 PM
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yea im guessing that mysterious ticking was something in the engine and not my cat/sway bar as it came back right when it was about to go.... it was probably caused by running the intense tune for a while =/
06-05-2007, 05:24 AM
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same setup i was running when i popped #4.... intake/2.7"/60's
sorry to hear about your car.
edit: dont be so quick to blame the intese tunes guys, my car was custom dyno tuned with an 11.5:1 air fuel ratio, and still popped. not saying running the intense tune wasnt a contributing factor, but i see the 60# injectors and pullys smaller than 2.8" as the only constant factor in all these blown motors. i have only seen one ljs go that was running 42.5's and he blew 3 cylinders not just #4. im not on this forum often so are there more cars over here blowing up on the 42.5's or is it pretty much just the 60's?
sorry to hear about your car.
edit: dont be so quick to blame the intese tunes guys, my car was custom dyno tuned with an 11.5:1 air fuel ratio, and still popped. not saying running the intense tune wasnt a contributing factor, but i see the 60# injectors and pullys smaller than 2.8" as the only constant factor in all these blown motors. i have only seen one ljs go that was running 42.5's and he blew 3 cylinders not just #4. im not on this forum often so are there more cars over here blowing up on the 42.5's or is it pretty much just the 60's?
06-05-2007, 10:22 AM
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Sorry to be so naive, but could you guys just clarify a few things for us?
So would you consider the originally listed mods of intake, exhaust, 2.7" pulley, and 60# injectors as "dangerous?" These seem like fairly "light" mods to me, which many people here seem to be running. I know it's very difficult to guess, but what exactly do you think the risk is here? With those mods, how many miles until the motor goes?
Or (to the OP) would you say that the lean intense tune was more likely the cause?
What exactly causes the "blown motors" like this? Is it a too lean air-fuel ratio? Is it something to do with the larger injectors? Or is it just a bad tune (again - too lean, but wouldn't the larger injectors help remedy this?)
For those who want to run smaller pulleys, what supporting mods would best reduce these kinds of risks? Definitely some cooling mods, correct? It appears we'd need more than a heat exchanger, so maybe methanol/water injection? For more aggressive supporting mods, what would be needed? New pistons? Would anything else be needed, or are the pistons the source of the failure mostly?
Again, sorry for the simple post, but if any of you more knowledgable guys could help out with these questions, I think it'd really help out the community. Thanks in advance.
So would you consider the originally listed mods of intake, exhaust, 2.7" pulley, and 60# injectors as "dangerous?" These seem like fairly "light" mods to me, which many people here seem to be running. I know it's very difficult to guess, but what exactly do you think the risk is here? With those mods, how many miles until the motor goes?
Or (to the OP) would you say that the lean intense tune was more likely the cause?
What exactly causes the "blown motors" like this? Is it a too lean air-fuel ratio? Is it something to do with the larger injectors? Or is it just a bad tune (again - too lean, but wouldn't the larger injectors help remedy this?)
For those who want to run smaller pulleys, what supporting mods would best reduce these kinds of risks? Definitely some cooling mods, correct? It appears we'd need more than a heat exchanger, so maybe methanol/water injection? For more aggressive supporting mods, what would be needed? New pistons? Would anything else be needed, or are the pistons the source of the failure mostly?
Again, sorry for the simple post, but if any of you more knowledgable guys could help out with these questions, I think it'd really help out the community. Thanks in advance.
06-05-2007, 10:26 AM
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i believe it was the knock that was assocaited with the intense tune, i knew it was cookie cutter and is really my own fault. But i do not believe they should offer it and say it will work. B/c it does... for a while... just get a custom tune and you should be fine, if your going to mod heavily get meth/water injection.
06-05-2007, 10:26 AM
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i believe it was the knock that was assocaited with the intense tune, i knew it was cookie cutter and is really my own fault. But i do not believe they should offer it and say it will work. B/c it does... for a while... just get a custom tune and you should be fine, if your going to mod heavily get meth/water injection.