ls/vtec. reliable?

POWEREDbyVTEC · Post by **POWEREDbyVTEC** » November 06, 2003

my ls vtec has never had a single problem

phan · Post by **phan** » December 18, 2003

Tb Fivel wrote:..the reason honda limited the ls motor to rev to 7 grand was because the cams stop making power there...type r cams make power a little higher than gsr's so they let the motor rev their...

you have got to be joking. you mean to tell me that an ls block and a type-r block both receive the same pressure on their cylinder walls? as RPM increase, the c.wall load increases...this is where r/s ratio comes into play. a good high-revving ratio is usually between 1.65-1.76/7. b16a = 1.75 = 8200 redline. b18b = 1.54 = more torque, but much lower redline (7200 i believe?). either way, you are wrong. the reason an LS motor cannot rev to 8500 like a type-r motor is NOT BECAUSE the camshafts stop making power above 7200. amongst other things, it's because of its' low r/s ratio and the large amount of c.wall pressure at higher rpm. i mean if this weren't the case, why bother sleeving/girdling the block and/or even worrying about it when converting to ls/vtec and revving high? show me ONE person that has taken a stock ls block (rods, pistons, stock sleeves) and thrown a built vtec head on it (revving above 9k rpm), that hasn't blown their motor within a month.

here, enlighten yourself: http://www.thejdm.com/forums/viewtopic.php?t=1008

Tb Fivel · Post by **Tb Fivel** » December 19, 2003

my ls/vtec hits 8,500 - 9 grand daily. stock ls crank, oem b16 rod bearings, stock ls rods, and b16 pistons. only after market part in my bottme end is the arp rod bolts. ls motors werent prepped for high reving, cause they were never intended for it. motors are built around 2 main aspects. cam design and stroke. any real engine builder knows this. cams limit you to where you make power, and stroke limits you largely to the amount of power you will be making. (there are ways around stroke ie: vtec, but it is one of the 2 main points of building a motor.)

the amount of air your motor is capable of moving limits you to the power you can make. if honda decided to throw such mild cams into the ls motor, why bother prepping the bottom end for high revving?

is it SAFER to rev an ls bottom end that high? no. is it that much more dangerous, not at all. do some research, there are plenty of motors with worse rod rations that rev just as high.

Post by **Nikku** » December 19, 2003

Tb Fivel wrote:my ls/vtec hits 8,500 - 9 grand daily. stock ls crank, oem b16 rod bearings, stock ls rods, and b16 pistons. only after market part in my bottme end is the arp rod bolts. ls motors werent prepped for high reving, cause they were never intended for it. motors are built around 2 main aspects. cam design and stroke. any real engine builder knows this. cams limit you to where you make power, and stroke limits you largely to the amount of power you will be making. (there are ways around stroke ie: vtec, but it is one of the 2 main points of building a motor.)

the amount of air your motor is capable of moving limits you to the power you can make. if honda decided to throw such mild cams into the ls motor, why bother prepping the bottom end for high revving?

is it SAFER to rev an ls bottom end that high? no. is it that much more dangerous, not at all. do some research, there are plenty of motors with worse rod rations that rev just as high.

wow

i am never ever ever going to your shop because you guys know NOTHING about building engines, the minimum that must be done to take an LS-VTEC over 7200rpm would be a block girdle, without that your engine will be doomed in about 1-1.5 years, have fun w/ the rebuild, a REAL engine builder (as you put it) knows that long stroke long rod motors ARE NOT ment to rev high, they are ment to make power in the low to mid range and not the top end..... :ohmy:

phan · Post by **phan** » December 19, 2003

Tb Fivel wrote:...do some research, there are plenty of motors with worse rod rations that rev just as high...

show me a stock motor with a worse r/s ratio that revs to 9k, PLEASE ->

temp wrote:...your engine will be doomed in about 1-1.5 years, have fun w/ the rebuild...

damn, that'd be a pretty block to see.

Tb Fivel · Post by **Tb Fivel** » December 19, 2003

seriously, how many of these motors have you guys put together? cause i can show you 10 motors off the top of my head that have been put together WITHOUT block girdles and have only failed due to owners mistakes. many of you have seen or know of for hybrids samuari gold ek. the motor was built at our shop. that thing saw way more abuse than im sure most people could put there cars through in more than 4 years and it blew due to a cracked b16 piston cause his compression was around 12:1. im not talking because i read shit, im talking about this because ive been there, ive doen it, and ive seen what works and what doesnt. reading about shit, and doing it are two completely different things.

Tb Fivel · Post by **Tb Fivel** » December 19, 2003

a REAL engine builder (as you put it) knows that long stroke long rod motors ARE NOT ment to rev high, they are ment to make power in the low to mid range and not the top end.....

and our cars were MEANT to be econo-boxes. it doesnt mean they cant be made to do shit they werent meant to do.

phan · Post by **phan** » December 20, 2003

miscommunication sucks. let's avoid anymore drama...