Stock Rod Limit

[Juben]

I admire your candor, BGolden. Not many tuners would come clean with a failure like this.

Mike

Isn't that the truth! Everyone tries to keep failures under wraps and that does nothing to help the community. I admire them for doing this!

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[Bullitt]

Thank you for the pictures. I guess only time will tell how long all these tuned cars running 400+ lbs/ft will last...

 

[MAPerformance]

Thank you for posting up the pictures!

 

[Ron@cp-e]

Here are the photos of the block and rod. Again I'll open it up for questions as long as your not attacking the tune or us.

After what I have seen from tearing this block down we will not be pushing customers cars past the 400 ft/lb of torque on stock block. I will be looking to stay in the 380 range for a customer. I still stand behind my statement that over 400 ft/lb of torque is a matter of time before a rod lets go and I do not plan to risk someones motor.

Also I ask that we can keep this thread on the development of the 2.3 Ecoboost engine. Not 5.0 headers or exhaust. There is alot of information we can learn from each other if we act like adults.

so what do you suspect is the direct cause of that rod bending like that before snapping ?

thanks for posting this !

 

[arghx7]

What everyone isn't realizing is that 400 ft/lbs in this motor would be equivalent to 800 ft/lbs in a 4.6. Its a lot of stress.

I understand where you're coming from, but an 8 cylinder has to work harder in the cylinder (higher indicated torque) than a 4 cylinder to make that kind of specific brake (or in this case wheel) torque. This is because of higher friction from additional cylinders and less efficient breathing on any normal cross-plane V8, where the cylinders' exhausts end up interfering with each other. The even firing order and divided integrated exhaust manifold helps a lot on the 2.3 Ecoboost.

400 lb/ft of wheel torque on a 2.3 4 cylinder is still a big deal though and way past what the engine was intended to be used for in the real world.

 

[neodark]

Thanks for the pictures...

So, if I understand this correctly it's not 400wtq that caused this, but the way it's delivered and spikes around 2K RPMS?

 

[Herr_Poopschitz]

I understand where you're coming from, but an 8 cylinder has to work harder in the cylinder (higher indicated torque) than a 4 cylinder to make that kind of specific brake (or in this case wheel) torque. This is because of higher friction from additional cylinders and less efficient breathing on any normal cross-plane V8, where the cylinders' exhausts end up interfering with each other. The even firing order and divided integrated exhaust manifold helps a lot on the 2.3 Ecoboost.

He meant it simply as a point of reference. He's fully aware of the variables.

I'm fine w/ limiting to 400 lb-ft. At 6000 rpm that would hit my desired hp goals just fine. Now go do it and prove it reliable so I can buy a car already!

 

[BGolden]

Thanks for the pictures...

So, if I understand this correctly it's not 400wtq that caused this, but the way it's delivered and spikes around 2K RPMS?

3200 is when it exited.

 

[soon2be]

3200 is when it exited.

SO 400 Wheel tq?

 

[geokots]

I'm new to tuning and this has me a little concerned. I have a new tuner and CAI to install (JLT/Bama) that I was planning to install on Saturday. I won't be at the 400 mark but should I feel safe with those 2 upgrades?
My plan was always to do just tune and CAI with the rest of the focus on suspension and appearance.

I know things happen even without mods and accept some risk. I just don't want it to be an inevitable failure.

 

[Apwrx]

I'm new to tuning and this has me a little concerned. I have a new tuner and CAI to install (JLT/Bama) that I was planning to install on Saturday. I won't be at the 400 mark but should I feel safe with those 2 upgrades?
My plan was always to do just tune and CAI with the rest of the focus on suspension and appearance.

I know things happen even without mods and accept some risk. I just don't want it to be an inevitable failure.

I'd say you would be fine. There are tuners who are beyond 400 wheel tq without grenaded motors.However you'll probably be a decent amount less I'd guess, which is pretty safe IMO.

 

[Billy1]

3200 is when it exited.

Seems kind of a low RPM for the the rod to exit the block. I would have thought that it would be closer to redline when it let go.

Was the car putting out 400 wtq like the next poster alluded to(an estimated 470 tq. at the crank with 15% drivetrain loss)? I thought it was putting out an estimated 400tq at the crank.

Bgolden please clairfy.

 

[Juben]

Seems kind of a low RPM for the the rod to exit the block. I would have thought that it would be closer to redline when it let go.

Was the car putting out 400 wtq like the next poster alluded to(an estimated 470 tq. at the crank with 15% drivetrain loss)? I thought it was putting out an estimated 400tq at the crank.

Bgolden please clairfy.

These cars can easily lay down 400+ wtq on a tune.

 

[greg hazlett]

Isn't that the truth! Everyone tries to keep failures under wraps and that does nothing to help the community. I admire them for doing this!

I see you....addle:

 

[Juben]

I see you....[emoji14]addle:

What you talking about playa? [emoji12]

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