Sellout

There's no reason that a built motor wouldnt last as long as a production motor as long as it's actually designed with that in mind and not as an all out race motor. You've got to use parts that are harder (less ductile) than you would use in a race motor, so it won't handle quite the extremes that you can get out of a race motor, but I'm talking about serious extremes here, worst case scenario type stuff.

I would have no qualms whatsoever about running 9500rpm and 700whp in a motor with those weaker, less ductile parts. Wouldn't have any issues with driving it hard every day and wouldn't worry about whether or not it lasts 100k, because if you take care of it, it just will.

You just don't want to try 12000rpm or 1200whp without the strongest parts you can get, and the strongest parts you can get are the ones that result in motors not lasting long on the street.

AlexS2200

So how about it, anyone here actually have a rebuilt motor that has over a 100k miles on it? We all know stock s2ks can lasted over 200k miles (from thoses who don't Vtec much ) but no actual post from anyone with a rebuilt motor over 100k miles.

So far only Chris@NLM has 50k plus built motors and camuman's buddy with 20k miles on a H22 motor. I personly have had 2.0L B series motors, but they only lasted approx 50k miles before the rings went bad and ate a qt oil every week.

ScorpionT

Ive seen plenty of built motors last 50k plus, some of that has to do with who is building it though.

"and the strongest parts you can get are the ones that result in motors not lasting long on the street." I completely disagree with this statement. Running 12k rpms is the reason for failure, not the parts used. Think of it this way, if you run a race at half your full potential, you might run 3 miles before you need to slow down. If you run as fast as you possibly can, you might make it 1/4 mile.

When you compare normal operating conditions of stock vs built motors you will see the reasons for failure. A stock motor is probably driven nicely, whereas the built motor is probably run to more extremes. 250hp/6k rpm daily vs 500hp/9k rpm. The extreme conditions increase chances of failure at exponential rates. If you see a built motor last only 25k miles, you can bet the owner is pushing the car much harder than his 50 year old neighbor with the same car, but totally stock.

kutsujula

Just make sure someone that knows what there doing is doing the work. When a person who doesnt know what there doing builds it. This happens



wiseco piston y0 out my old tC lol

camuman

ROFL. sorry dude i had to laugh. i did something similiar to a je piston. i had a stupid fmu setup since i was to cheap to get an aem for that car. fmu failed at 7k rpm at near 100mph. motor popped! burned a hole thru two of the 4 pistons. FMU FTL

asukadc

^^^ so have all the nice parts/ internal... one day the computer fails ... motor will still pop is where i'm getting

Sellout

Then you don't understand what ductility means, and it's just that simple. This is not an attack, it's just a fact that in order to get parts that are able to handle the extremes that I mentioned, they have to be more ductile, which makes them wear faster, whether you race it or not.

Sellout

That's pretty much how most engines end up blown. Even on stock internals, it's very rare to see an engine blown because it was making too much power. It's usually a failed part or simply a tuning issue. It's just not possible to make a motor that will survive poor tuning or something like a failed FMU at full load.

S-EMPIRE

didn't read what others have put but it come down to your engine builder and tunner. or if anything on your car fails like oil pressure, ex leak, sensors, and ect

s2k_bb

Good explanation. As long as it's not some 1200hp stroked drag monster that needs to be rebuilt every other run.