Dr. Destructo blows a rocker apart

[Dezoris]

Originally Posted by SmsAlSuwaidi

Stock spring pressure is very very soft, to the point that opening them is easily done with a finger


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I meant I assumed it was upgraded from stock, was curious on how much additional spring pressure was on rockers and if that combined with higher rpm is going to accelerate deflection, failure or rollers walking. You had rockers walk on stock springs? Were you runing over 7500rpm?

[SmsAlSuwaidi]

Originally Posted by Dezoris

I meant I assumed it was upgraded from stock, was curious on how much additional spring pressure was on rockers and if that combined with higher rpm is going to accelerate deflection, failure or rollers walking like you had but apparently with stock springs.

Oh elements car has upgraded springs, but in our case they were stock


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[Dezoris]

Originally Posted by SmsAlSuwaidi

Oh elements car has upgraded springs, but in our case they were stock


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I changed my post, were you running over 7500rpm on high boost when your rockers walked?

[Element Tuning]

Originally Posted by Dipstik-sportech

Did you find out if it damaged any internals yet?

Well unfortunately we have 18 other engine builds and are under a timeline to deliver Factor Five their dry sumped race engine so my car has been kicked to the curb. LOL!

I'm rarely lucky so I'm going to say one intake valve is tweaked but until we leak it down we wont know. I may get to it after hours in the next few days but we'll see.

[SmsAlSuwaidi]

Originally Posted by Dezoris

I changed my post, were you running over 7500rpm on high boost when your rockers walked?

This car is on pump, 12psi and 7800


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[Captain Snooze]

Originally Posted by SmsAlSuwaidi

Its a pretty common issue with these motors.

So Subaru and Toyota will be doing a recall?

[Element Tuning]

Also lets keep in mind my failure is not a result of spitting the rocker out intact. This failure is either a less than ideal rocker pin installation at the factory or its a result of being used in a higher stressed application than designed for.

In my case I am not a fan of excessively high valve spring seat pressures so we do run only what we need. This does cut down on valvetrain stress and wear. Only in cases where really high ramp rate cams would warrant a high seat pressure spring but you would still have all of the downsides. I would suspect this is part of the reason Element Tuning motors don't have excessive valve bucket wear like so many other engines we see posted with bucket wear. With that said we are still probably double the oem for boosted applications in the 60 psi range.

So we are exerting more force against the rocker roller and we are also spinning it much faster. So I would think more pressure and more rpm exerted against the roller as it follows the cams basically spun the pin (axle) and eventually it walked out. While this may be an isolated incident, I say there is no such thing on an application that is 3-4 times factory HP. We will secure the pins on every engine we build as it's always best to accommodate for a potentially inadequate part. It would be zero consolidation for a client to save $200 only to end up with a paper weight after a $20 rocker fails.

[phobos512]

Hey I just realized you guys are in Maryland. I think we need to have an open house for FT86Club at your place.

[SmsAlSuwaidi]

Originally Posted by Captain Snooze

So Subaru and Toyota will be doing a recall?

No they wont, these motors weren't made for boost and the majority of the motors i know blowing were fi


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[Element Tuning]

Originally Posted by phobos512

Hey I just realized you guys are in Maryland. I think we need to have an open house for FT86Club at your place.

Ha ha that would mean people would know where we are and stop by all the time preventing us from getting all those engines built

Maybe one day when I'm not pissed at my FRS. I think I need a few more trophies and I'll get over it. LOL!

[Element Tuning]

Originally Posted by SmsAlSuwaidi

Its a pretty common issue with these motors.

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Looks like your rocker spit out but was intact. I would suspect that's due to the light NA valve springs and you just floated a valve.

[SmsAlSuwaidi]

Originally Posted by Element Tuning

Looks like your rocker spit out but was intact. I would suspect that's due to the light NA valve springs and you just floated a valve.

Yup, funny that the car was barely on any load when it happened. The car is now being shipped overseas though and is getting a 2j or lsx. While the one that is still in the states I'm going to give the fa20 another shot


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[sw20kosh]

Originally Posted by Element Tuning

Looks like your rocker spit out but was intact. I would suspect that's due to the light NA valve springs and you just floated a valve.

So he floated a valve and caused damage to his engine at 12 psi on pump gas running 300-330 wp? All these damaged motors is making me think this engine isn't as strong as people initially thought.

[SmsAlSuwaidi]

Originally Posted by sw20kosh

So he floated a valve and caused damage to his engine at 12 psi on pump gas running 300-330 wp? All these damaged motors is making me think this engine isn't as strong as people initially thought.

Its not sadly


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