Maybe you guys can help me out on this...

By investing money into better parts, that naturally make more power, and happen to be stronger, are we hurting reliability?

For example, is a moderate H/C package with titanium valvetrain components, stronger rods, springs, retainers, etc. etc., any less reliable than a stock LS1?

How do engines respond to increased power output in terms of reliability? I know to a certain extent, the engine can be destroyed, obviously. Too much spray, to much boost, weak components equals boom. But are basic bolt-ons and H/C packages damaging to an engines life?

I know these are vague questions because much needs to be done to support the power in terms of fuel, oil, increased maintenance. But if we increase power, proportionately along with fuel, and everything an engine needs to function and perform, is the average guy making their engine last any less?

 

Its all relative, Depending on how you drive your car.
For the most part its not the engine that you will see fail its the trans and your rear.
But you have to decide what your goals are is it going to be a track car or a dyno Queen? Realize with a good heads and cam set up that you will be pushing alot more hp than the car was designed with so alot of factors come into play.

 

Typically it's a matter of revving the motor higher to take "advantage" of those mods that will shorten the life of a motor. Unless a simple modification messes with the Air:Fuel ratio dramatically, or the user doesn't change the tune to calibrate for the mod, THEN something could physically damage the motor. Other than that, a simple mod such as a Fast 90mm or larger throttle body, K&N, ect, wont change a thing as far as longevity.

What will change the life of the motor more than anything else is friction, heat and revs.

 

I understand sustained high revolutions place heat and friction on engine parts, maintenance and quality of lubricant comes into play.

Are you saying that reving my engine a few hundred rpms more for short amounts of times causes that much more wear on my engine than it was originally designed for?

 

I'm not speaking in terms of the car, I'm referring to the engine.

Are you saying that improving the upper-half of the engine is going to cause my block and rotating assembly to wear faster?

Nobody is really making any sense.

 

This is the main idea to understand, good.

I just covered this in another thread actually...

Inertial loads on the rotating assembly go up with the square of the RPM increase, so consider that at 7200rpm the inertial load will be 144% greater than at 6000rpm. That is just an example to better understand metal fatigue with higher revs. Heat is the weakening agent in metallurgy. No matter what engine we're talking about, revving it higher will increase friction, thus wear.

Honestly it's nothing to get hyped up about. Who's to say your motor will last as long as another LS1? Who's to say it will last 100k miles or 200k miles? Maybe more? The simple answer to that, the engine builder. If you want increased longevity, read up on blue printing short blocks.

 

That makes alot of sense. If you know, where is this load placed? Crank Journals, connecting rods, cylinder walls, everywhere?

So improved cooling is recommended due to more heat.

 

Everywhere, yes. The only things that are probably free from metal fatigue are the valve covers.
No matter the build, improved cooling will always help unless you're a diesel in sub freezing temperatures.