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Old 04-29-2012, 07:44 PM   #1
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Limits of stock 1nzfe found once and for all.

This is my motor with bent rod and cracked block and piston sleeve. This was at 12psi and 197whp dynoed only 2 days before major engine noise on a mustang dyno. Now on to the build of my junk jard motor.
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Old 04-29-2012, 08:19 PM   #2
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Ouch
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Old 04-29-2012, 10:58 PM   #3
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Told ya the rods where the first to go lol. Thanks to for getting that Dyno. Be sure to add your info to my durability thread when u get a chance. You pushed it further than i did by 2 psi. At 10psi after awhile I burnt up my valves. How are yours?
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Old 04-30-2012, 01:55 AM   #4
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Wow. I'll keep the innuendos to myself.

Looking forward to watching your rebuild. Thanks again - this is a vital piece of information for those of us with boost.
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Old 04-30-2012, 02:17 AM   #5
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hmmm Gonzo rods :D Sorry to hear that dude, but now we have a better idea of the limitations of the stock hardware :)
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Old 04-30-2012, 07:14 AM   #6
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It has become obvious that 8psi is the max safe boost level with considerations of even staying at 6 for those folks that are looking for longevity and reliability. Personally in hindsight with my build I wouldn't tell anyone to use an internal wastegate unless they installed a premium turbo. I would also sttrongly recommend performing a compression test before and then again after installation.
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Old 04-30-2012, 07:17 AM   #7
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I wish that I could reinforce your results, but since I had spiked to over 25psi the couple times my situation isn't a good marker. I will enjoy tearing my motor down especially since my rods shattered.
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Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes.
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Old 04-30-2012, 07:54 AM   #8
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Quote:
Originally Posted by pimp my yaris View Post
This is my motor with bent rod and cracked block and piston sleeve. This was at 12psi and 197whp dynoed only 2 days before major engine noise on a mustang dyno. Now on to the build of my junk jard motor.
Did you post the dyno chart from your mustang run?
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Old 04-30-2012, 12:04 PM   #9
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I'm still wondering if there is a difference in the bottom end of the echo/xb compared to the yaris. Blownxa said he went through a few engines just above 150whp in his xa (with a good/safe tune) as well as a couple other xb guys on clubxb.com

Sorry to hear about your engine pimp. How much boost will you be running once it is built?
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Old 04-30-2012, 12:38 PM   #10
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^ They seem identical to me. I've reviewed them side by side. Don't know about part numbers.
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Old 04-30-2012, 12:47 PM   #11
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thats some high boost for these little guys. Now to the build. Good Luck!
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Old 04-30-2012, 12:59 PM   #12
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^ They seem identical to me. I've reviewed them side by side. Don't know about part numbers.
Looking at the EPC, the Echo, xA, xB, and Yaris all share the same part numbers for pistons, rods, and crankshaft. The Prius uses the same rods, but different pistons and crankshaft.
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Old 04-30-2012, 01:32 PM   #13
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The rods are useless unfortunately. I totally underatand why they are what they are, but it still is a fact.
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Old 04-30-2012, 01:40 PM   #14
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The rods are useless unfortunately. I totally underatand why they are what they are, but it still is a fact.
It would be very interesting to have one of the stock rods analyzed for its real rating. From what I have been reading in some automotive engineering journals, stock rods are typically designed to handle between 25% and 40% more force than stock, which in our case would mean about 150 HP max (if ours are really 40% over engineered).

If we could find out the compression PSI limit of the stock rods, it would be easy enough to run the math to determine the theoretical boost limit.
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Old 04-30-2012, 01:50 PM   #15
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Crashy would cowering in fear if she could read that post :D
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Old 04-30-2012, 07:38 PM   #16
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I wouldn't tag a certain amount of boost to the limitation of stock rods.... It is power. Most likely the onset of power (torque) is the best measurement of limitation.
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Old 04-30-2012, 08:41 PM   #17
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I wouldn't tag a certain amount of boost to the limitation of stock rods.... It is power. Most likely the onset of power (torque) is the best measurement of limitation.
True, although it is the instantaneous force of the combustion explosion pushing against the crank before the rotation occurs that does the damage, as that peak force can be in excess of 6000 lbs. That force is the pressure within the cylinder at combustion multiplied by the area of the piston and by the sine of the angle of the rod at TDC (which is about 10 degrees). So, if that force peaks high enough either the bearing or rod will fail.
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Old 04-30-2012, 08:42 PM   #18
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I wouldn't tag a certain amount of boost to the limitation of stock rods.... It is power. Most likely the onset of power (torque) is the best measurement of limitation.
^^this
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