autoaddictions
Active member
How much power will a stock short block handle with eagle rods,forged pistons and arp hardware? Asuming a proper tune.
stock crank 2 bolt mains hp limit??
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SeattleSy#1255
Category 5 Conservative
Re: stock crank 2 bolt mains hp limit??
i'm going to guess 5-600 but 2 bolt i'd be worried. and maybe the crank cyro.
i'm going to guess 5-600 but 2 bolt i'd be worried. and maybe the crank cyro.
Wikid 1
200+ lbs of puppy!
Re: stock crank 2 bolt mains hp limit??
Well, stock "Short block" includes rods/pistons/crank your basicly wanting to know when the crank will give out if you up grade everything else? i've heard 700hp alot (considering how low these things rev thats a helluva lot of tq, and Tq=FUN) If you've got it out, do the splayed 4 bolt mains. it's worth the extra 400 dollars. a flexing crank (high RPMs) is what will kill it. keep it in there tight.
Well, stock "Short block" includes rods/pistons/crank your basicly wanting to know when the crank will give out if you up grade everything else? i've heard 700hp alot (considering how low these things rev thats a helluva lot of tq, and Tq=FUN) If you've got it out, do the splayed 4 bolt mains. it's worth the extra 400 dollars. a flexing crank (high RPMs) is what will kill it. keep it in there tight.
gkrcr882
SyTyless......for now!
Re: stock crank 2 bolt mains hp limit??
I've also heard that high rpms will kill these motors, due to thier overall design(externally balanced as well). If the revs stay within the factory limits (top out at around 4500-4700) I'm sure a stock 2-bolt could handle around 500-600 horsepower depending on boost. Higher engine speeds and higher boost will require a 4-bolt. I wouldn't be too concerned about the crank and bottom end, since the usual weakpoint is the rods/pistons. On a stock engine with the boost cranked up to 18-20 psi, you will throw a rod. If you don't believe me, we have a truck with a nice gash in the oil pan and chunks of endcap everywhere:2cents:
I've also heard that high rpms will kill these motors, due to thier overall design(externally balanced as well). If the revs stay within the factory limits (top out at around 4500-4700) I'm sure a stock 2-bolt could handle around 500-600 horsepower depending on boost. Higher engine speeds and higher boost will require a 4-bolt. I wouldn't be too concerned about the crank and bottom end, since the usual weakpoint is the rods/pistons. On a stock engine with the boost cranked up to 18-20 psi, you will throw a rod. If you don't believe me, we have a truck with a nice gash in the oil pan and chunks of endcap everywhere:2cents:
Wikid 1
200+ lbs of puppy!
Re: stock crank 2 bolt mains hp limit??
:stupid: Speed kills. this is true anywhere. ESPECIALLY inside your engine. (and ricers brag about spinning motors to 9k ) think about it, diesels lask several hundered thousand miles, only spin to 3 grand. there are several forces at work inside the motor, (read Maximum boost. especially if you own one of these friggin trucks! ) and there is a reason "weak" stock cast cranks last so long! especialy in a turbo charged application! by keeping the redline low, say 5200, the crank will last to an absurd amount of power, because the main loading on the crank is (genericaly speaking) in the direction of rotation, where if you spin it faster to make more power the inertial loads will pull the crank/rods appart. this is why when a rod lets go the majority of the time its the rod bolts that let go. I'd get the book and type out exactly what i'm talking about by i let my friend borrow it, he just got his vega/GN motor swap done and i told him to read it before he went too nuts
:stupid: Speed kills. this is true anywhere. ESPECIALLY inside your engine. (and ricers brag about spinning motors to 9k ) think about it, diesels lask several hundered thousand miles, only spin to 3 grand. there are several forces at work inside the motor, (read Maximum boost. especially if you own one of these friggin trucks! ) and there is a reason "weak" stock cast cranks last so long! especialy in a turbo charged application! by keeping the redline low, say 5200, the crank will last to an absurd amount of power, because the main loading on the crank is (genericaly speaking) in the direction of rotation, where if you spin it faster to make more power the inertial loads will pull the crank/rods appart. this is why when a rod lets go the majority of the time its the rod bolts that let go. I'd get the book and type out exactly what i'm talking about by i let my friend borrow it, he just got his vega/GN motor swap done and i told him to read it before he went too nuts
autoaddictions
Active member
Re: stock crank 2 bolt mains hp limit??
I killed my motor 2 days ago. It runs but knocks bad. My guess is crank bearing went or I bent a rod. My truck ran 12.50 at 108 at 4350 pounds Im guessing it had to make 450hp or so. Ive got to fix it, but not sure what level to build it too. Id be ok with a mid to high 11s.
I was considering forged pistons and rods a mild port job on the stock heads, comp cam 422 or smaller. My motor only had 30,000 miles on it so im sure my heads are in good shape.I was runnig a 2 bar map and pitbull chip 19psi of boost im sure all the knock is what killed it, not the power iIt made. Ive leared that a 3 map and new chip is in order for my rebuild. Nitrated crank and splaying the block for a 4 bolts is a grand., Id rather spend it on my real race car im building. So i guess what im asking is mid 11s safe on a ty with a stock crank 2 bolt mains? Also any thoughts on whare to buy the chip i need? Im running Atr 900 cfm turbo with there down pipe and external w/gate. Im pretty sure this turbo will get me into the 11s. 50 pound ing. or stock ? Any Advise be nice.
I killed my motor 2 days ago. It runs but knocks bad. My guess is crank bearing went or I bent a rod. My truck ran 12.50 at 108 at 4350 pounds Im guessing it had to make 450hp or so. Ive got to fix it, but not sure what level to build it too. Id be ok with a mid to high 11s.
I was considering forged pistons and rods a mild port job on the stock heads, comp cam 422 or smaller. My motor only had 30,000 miles on it so im sure my heads are in good shape.I was runnig a 2 bar map and pitbull chip 19psi of boost im sure all the knock is what killed it, not the power iIt made. Ive leared that a 3 map and new chip is in order for my rebuild. Nitrated crank and splaying the block for a 4 bolts is a grand., Id rather spend it on my real race car im building. So i guess what im asking is mid 11s safe on a ty with a stock crank 2 bolt mains? Also any thoughts on whare to buy the chip i need? Im running Atr 900 cfm turbo with there down pipe and external w/gate. Im pretty sure this turbo will get me into the 11s. 50 pound ing. or stock ? Any Advise be nice.
SeattleSy#1255
Category 5 Conservative
Re: stock crank 2 bolt mains hp limit??
i believe you, but this is not true for all trucks...the magic is in the tune and obviously, a motor that isn't detonating. I've seen 22-24 psi, some with larger turbos, run on stock trucks and be fine. Its all about the tune. at the same time, stock trucks have blown at 15psi....
it depends on the truck and most of all the tune.
its a matter of physics that lower RPMs is easier on a motor.
gkrcr882 said:
i believe you, but this is not true for all trucks...the magic is in the tune and obviously, a motor that isn't detonating. I've seen 22-24 psi, some with larger turbos, run on stock trucks and be fine. Its all about the tune. at the same time, stock trucks have blown at 15psi....
it depends on the truck and most of all the tune.
its a matter of physics that lower RPMs is easier on a motor.