Forged internals
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From: Nanty Glo, Pa
Forged internals
along with the 3000 companies i plan on calling tomorrow... i'm going to get pricing on Ross Pistons and Crower Rods... i will be turboing this car... and i'm going to push it to the max eventually... couple of opinions i need
What ratio should i get the pistons? 8.5:1? 9:1? 9.5:1? I usually hear that 8.5-9 is the sweet spot... so would 8.75 be a valid size?
also what should i look for on the rods... i'm not 100% sure what i'm looking for but i wanna upgrade the internals.. and some other things then i'm going to go dive into a turbo so i can max performance once i can afford it.
What ratio should i get the pistons? 8.5:1? 9:1? 9.5:1? I usually hear that 8.5-9 is the sweet spot... so would 8.75 be a valid size?
also what should i look for on the rods... i'm not 100% sure what i'm looking for but i wanna upgrade the internals.. and some other things then i'm going to go dive into a turbo so i can max performance once i can afford it.
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From: Nanty Glo, Pa
Originally Posted by lrh35
From what I hear 8 - 8.5/1 is best but I really wouldn't know.
correct me if im wrong here, but this is how i understand it:
if you wana turbo, you need a lower compression because the pressure is already increased in the manifold before it gets compressed by the pistons. adding aditional compression in the cylinder would multiply the amount of boost you are running. GOod for power, bad for the block if you keep it too high. By lowering the work the pistons have to do, you take some stress off the entire system. But, if you go too low you might have ignition problems. I think malvin used 9.5:1 to get his 400whp.
For NA, you want higher compression to give more power by pushing as many molecules of fuel/air as close together as possible. but if you go too high, the engine may struggle to turn over or idle poorly.
So, idealy, two sets of pistons would be needed to allow either application. a 12.5:1 - 14:1 would be nice for NA. i think a 9.5:1 or maybe even a 9:1 would be nice for boosting. when u talk to them, ask for their oppinions on a 2.4L 4cyl with target HP ratings of X.
if you wana turbo, you need a lower compression because the pressure is already increased in the manifold before it gets compressed by the pistons. adding aditional compression in the cylinder would multiply the amount of boost you are running. GOod for power, bad for the block if you keep it too high. By lowering the work the pistons have to do, you take some stress off the entire system. But, if you go too low you might have ignition problems. I think malvin used 9.5:1 to get his 400whp.
For NA, you want higher compression to give more power by pushing as many molecules of fuel/air as close together as possible. but if you go too high, the engine may struggle to turn over or idle poorly.
So, idealy, two sets of pistons would be needed to allow either application. a 12.5:1 - 14:1 would be nice for NA. i think a 9.5:1 or maybe even a 9:1 would be nice for boosting. when u talk to them, ask for their oppinions on a 2.4L 4cyl with target HP ratings of X.
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From: Nanty Glo, Pa
Originally Posted by blk-majik
correct me if im wrong here, but this is how i understand it:
if you wana turbo, you need a lower compression because the pressure is already increased in the manifold before it gets compressed by the pistons. adding aditional compression in the cylinder would multiply the amount of boost you are running. GOod for power, bad for the block if you keep it too high. By lowering the work the pistons have to do, you take some stress off the entire system. But, if you go too low you might have ignition problems. I think malvin used 9.5:1 to get his 400whp.
For NA, you want higher compression to give more power by pushing as many molecules of fuel/air as close together as possible. but if you go too high, the engine may struggle to turn over or idle poorly.
So, idealy, two sets of pistons would be needed to allow either application. a 12.5:1 - 14:1 would be nice for NA. i think a 9.5:1 or maybe even a 9:1 would be nice for boosting. when u talk to them, ask for their oppinions on a 2.4L 4cyl with target HP ratings of X.
if you wana turbo, you need a lower compression because the pressure is already increased in the manifold before it gets compressed by the pistons. adding aditional compression in the cylinder would multiply the amount of boost you are running. GOod for power, bad for the block if you keep it too high. By lowering the work the pistons have to do, you take some stress off the entire system. But, if you go too low you might have ignition problems. I think malvin used 9.5:1 to get his 400whp.
For NA, you want higher compression to give more power by pushing as many molecules of fuel/air as close together as possible. but if you go too high, the engine may struggle to turn over or idle poorly.
So, idealy, two sets of pistons would be needed to allow either application. a 12.5:1 - 14:1 would be nice for NA. i think a 9.5:1 or maybe even a 9:1 would be nice for boosting. when u talk to them, ask for their oppinions on a 2.4L 4cyl with target HP ratings of X.
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From: ATL
WTF, the main reason for higher or lower compression is decreasing detonation or reducing the need for HIGH octane gas. High as in 100+ octane. More compression is equal to more power. But that power can get annoying if you can only run 100+ octane on the way to work.
If you plan on going hardcore turbo 20+ psi, consider the 8:1. Otherwise 8.5:1 is sufficent if you are running a properly intercooled setup.
If you plan on going hardcore turbo 20+ psi, consider the 8:1. Otherwise 8.5:1 is sufficent if you are running a properly intercooled setup.
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From: Nanty Glo, Pa
Originally Posted by MitsuRalliArt
WTF, the main reason for higher or lower compression is decreasing detonation or reducing the need for HIGH octane gas. High as in 100+ octane. More compression is equal to more power. But that power can get annoying if you can only run 100+ octane on the way to work.
If you plan on going hardcore turbo 20+ psi, consider the 8:1. Otherwise 8.5:1 is sufficent if you are running a properly intercooled setup.
If you plan on going hardcore turbo 20+ psi, consider the 8:1. Otherwise 8.5:1 is sufficent if you are running a properly intercooled setup.
wow, nice find =) while its not in running condition, send the pistons and rods out to have some diff compression prototypes made and maybe talk them into entering them into the product line =)
try here: http://www.wiseco.com/sections/automotive.html
try here: http://www.wiseco.com/sections/automotive.html
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From: Nanty Glo, Pa
Originally Posted by blk-majik
wow, nice find =) while its not in running condition, send the pistons and rods out to have some diff compression prototypes made and maybe talk them into entering them into the product line =)
try here: http://www.wiseco.com/sections/automotive.html
try here: http://www.wiseco.com/sections/automotive.html
