stock engine capability
#1
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I have a 2008 chevy silverado 1500 4x4 5.3L. I am interested in getting about 550 rwhp out of it. I am curious to know if anyone has any information on how much hp the stock engine can handle before I would need to rebuild it or experience major problems. Thanks
#4
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#9
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i dyno'd 702 with a 4.8 i was also around 800rwhp for awhile but never dyno'd
keys to making a stock motor live.........
Tune is the key being smart about it is most important thing you can do.
High IATs will do harm on the motor fast. if the IATs are over 120 i start pulling timing and adding fuel
High ECTs will kill a motor in a heartbeat. PPl say number 7 fails cause of lean actually its the poor flowing of coolant thru the heads. ppl have tested and found out if you put a temp reading on the driverside head around 5 and 7 youll read a much higher temp then you would on 6 and 8. this is why number 7 fails. the heat just cooks the piston. Since there isnt a direct way of fixing this, some have along with myself run vapor ports vented all 4 corners. also keeping the ect in the 150s overall will help much with keeping those cylinders cool. if your overall temp is 150 then your rear cylinder is around 180 when it sees a hot spot. now if your are at 190 and you see a hot spot then youll be in the 240 range roughly which is high but combine that with high IATs and lean mixtures and youll melt a piston in a heartbeat.
now as for longivity i ran my setup for close to 7k worth of hard abuse. i tore it down just to see how it looked. motor showed no signs of any failure, i also did follow the lines above on how to keep it alive.
at 500 that motor should last forever but only if you follow the right steps. its not rocket science knowing keeping anything cool will go longer then something seeing extreme temps
keys to making a stock motor live.........
Tune is the key being smart about it is most important thing you can do.
High IATs will do harm on the motor fast. if the IATs are over 120 i start pulling timing and adding fuel
High ECTs will kill a motor in a heartbeat. PPl say number 7 fails cause of lean actually its the poor flowing of coolant thru the heads. ppl have tested and found out if you put a temp reading on the driverside head around 5 and 7 youll read a much higher temp then you would on 6 and 8. this is why number 7 fails. the heat just cooks the piston. Since there isnt a direct way of fixing this, some have along with myself run vapor ports vented all 4 corners. also keeping the ect in the 150s overall will help much with keeping those cylinders cool. if your overall temp is 150 then your rear cylinder is around 180 when it sees a hot spot. now if your are at 190 and you see a hot spot then youll be in the 240 range roughly which is high but combine that with high IATs and lean mixtures and youll melt a piston in a heartbeat.
now as for longivity i ran my setup for close to 7k worth of hard abuse. i tore it down just to see how it looked. motor showed no signs of any failure, i also did follow the lines above on how to keep it alive.
at 500 that motor should last forever but only if you follow the right steps. its not rocket science knowing keeping anything cool will go longer then something seeing extreme temps