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why oh why has my valve spring broken?? 

 

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 Post subject: why oh why has my valve spring broken??
Posted: Mon Jan 23, 2006 6:59 pm 
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i have crow valve springs matched to the stage 3 cam and number 6 exhaust spring has broken!Im sure the most iv ever revved to is like 5500,it broke at some stage doing 120 on the freeway,didnt even notice till i came to a stop and it was running s**t!

 

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 Post subject: Re: why oh why has my valve spring broken??
Posted: Mon Jan 23, 2006 7:30 pm 
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madeaspack wrote:
i have crow valve springs matched to the stage 3 cam and number 6 exhaust spring has broken!Im sure the most iv ever revved to is like 5500,it broke at some stage doing 120 on the freeway,didnt even notice till i came to a stop and it was running s**t!
are they new?

 

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Posted: Mon Jan 23, 2006 9:51 pm 
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5500rpm in an EA.. you're eager, arn't ya!

 

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Posted: Mon Jan 23, 2006 10:17 pm 
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got an entire ED head sitting here I can strip the valve springs out of it if ya want some short term ones..

did the valve drop at all? of there was still enough presure holding the collets in?

 

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Posted: Mon Jan 23, 2006 11:53 pm 
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fnp wrote:
5500rpm in an EA.. you're eager, arn't ya!


by the looks of it, it's a worked 4.0L

i'd be sussin it out, that shouldn't happen even at high rpm.

 

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Posted: Tue Jan 24, 2006 12:02 am 
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I snapped a total of 3 valve springs in the time I had the Dev5a kit running. ^jAsE^ also snapped 2 (both at the same time). Both cars were rev limited with factory ECU at the time too!

Since then, I replaced the valve springs to a different spec, and had the Waggin's engine out to 7000rpm, no issues with valve springs!

 

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Posted: Tue Jan 24, 2006 9:44 am 
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I broke a valve spring the other day - crane, suited to the cam I run. Noone could explain how it happened, car is limited to 5000rpm and the motor and springs are only 5000k's old. I guess it could just be a casting weakness.

 

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Posted: Tue Jan 24, 2006 11:34 am 
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fnp wrote:
5500rpm in an EA.. you're eager, arn't ya!


Hi
i dont know about being eager.
i have a ea 3.9 mpfi engine is stock except for extractors and xh snorkle
and it will pull all the way to 5500 rpm all day long . maybe its just a freak ??? . i can rev it to 6000 rpm if i feel eager but it will only pull to 5500rpm before the power starts to drop off...
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Posted: Tue Jan 24, 2006 6:09 pm 
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Maybe because it's Crow? Not the first time I've heard bad stuff about there products!

 

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Posted: Tue Jan 24, 2006 6:33 pm 
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it did it freeway driving,bout 3000,but i rang crow today,they said they've never had a problem ever with their valve springs,they have a new set on the way and want the old ones back to see whats gone wrong!they said the springs dont even work hard in the 4.0lt n that they have heaps of travel!it is pretty worked and im sure could pull 6-7000,still powering at 5500!

 

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Posted: Tue Jan 24, 2006 7:01 pm 
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are they double springs?.
Going back in the old day's when I was heavily into street performance we used double valve springs recommended by the cam people. what we used to do is run the cam with the single outer spring for the first 500km & stay below 4000rpm. after that, install the inner valve springs & re-torque the head bolts & continue for another 500km until they saddled in. that is if it's a full engine rebuild.
some of those spring are harden to the point that they become brittle, if your inpatient they will snap or damage the cam. its alway good to run it in first.

patient's is the key to unlimited reliable km's.

 

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Posted: Tue Jan 24, 2006 8:31 pm 
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its been on the road for 3 months and thay are double row springs

 

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