Just snapped a Crane dual on my way to work
#21
im running those springs on my stage 2 pp heads and tsp 237/231 cam, now for 12,000 miles and 2 trips to missoui that is 18 hours each way from me and have had no problems, i let car warm up fully before i mover it and have since day one,
note: i have the crane springs because the pp ones wasnt out when i got my heads
Eddie
note: i have the crane springs because the pp ones wasnt out when i got my heads
Eddie
#23
Originally Posted by SloppyRob
no shims
There could be the cause of your problem. With no shims you were not running enough seat pressure for a cam that size. With the older model Crane springs you should have had them set-up at about 1.770-1.780 for about 145lbs of seat pressure and about 375 open pressure. The newer Cranes with the yellow and blue stripe need to be installed at about 1.715-1.725 for the same pressure.
If you don't have enough spring pressure for a given cam it could be floating or bouncing the valves and that will lead to spring failure. We've been running the Cranes since the first sets were available. At well over .600 lift and 7200 rpms we never had a single failure. Hopefully that trend will continue.
#24
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From: Cecil County Raceway!!!
Originally Posted by 2 SLOW
i believe alan says to use the shims to up the seat pressure, that was prob. what is wrong.
Thats .080 shim over factory install height
LOL...this was less than 1 minute after Pauls post
#26
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From: Cecil County Raceway!!!
Originally Posted by 2 SLOW
i believe alan is sending me a .030 shim for the f13.. does that sound right paul/fireball?
If so you'll get the new ones with teh blue and yellow stripe. If thats the case you wanna run .080 of shim
#27
Originally Posted by Fireball
are you replacing all the springs?
If so you'll get the new ones with teh blue and yellow stripe. If thats the case you wanna run .080 of shim
If so you'll get the new ones with teh blue and yellow stripe. If thats the case you wanna run .080 of shim
I agree 100%.
Paul
#31
Fireball,
Did you put the springs on my heads, or did J? I don't think I have stripes on mine, I think they are the old ones. I got the springs/seats/retainers from Joe and the cam too - he didn't say anything about needing shims. Should I have shims on mine with .588 lift? Engine doesn't see over 6,500. This post has me worrying, but with 70 passes on the motor I must be in pretty good shape.
Did you put the springs on my heads, or did J? I don't think I have stripes on mine, I think they are the old ones. I got the springs/seats/retainers from Joe and the cam too - he didn't say anything about needing shims. Should I have shims on mine with .588 lift? Engine doesn't see over 6,500. This post has me worrying, but with 70 passes on the motor I must be in pretty good shape.
#32
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From: Cecil County Raceway!!!
Originally Posted by BLK02WS6
Fireball,
Did you put the springs on my heads, or did J? I don't think I have stripes on mine, I think they are the old ones. I got the springs/seats/retainers from Joe and the cam too - he didn't say anything about needing shims. Should I have shims on mine with .588 lift? Engine doesn't see over 6,500. This post has me worrying, but with 70 passes on the motor I must be in pretty good shape.
Did you put the springs on my heads, or did J? I don't think I have stripes on mine, I think they are the old ones. I got the springs/seats/retainers from Joe and the cam too - he didn't say anything about needing shims. Should I have shims on mine with .588 lift? Engine doesn't see over 6,500. This post has me worrying, but with 70 passes on the motor I must be in pretty good shape.
You are not shimmed and it would require pulling all the springs and valve seals to put shims under there.
#33
Originally Posted by Fireball
You have the older cranes. The new ones with the stripes were just released last week.
You are not shimmed and it would require pulling all the springs and valve seals to put shims under there.
You are not shimmed and it would require pulling all the springs and valve seals to put shims under there.
#34
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From: Cecil County Raceway!!!
I'm not an expert in this field and I'm drawing alot of information from Thunder...
but they like to set them up tight...
Lets say this...I have the new duals...and with a .612 lift they want me to run them at 1.720 (.080 shim on stock heads). For the old springs they recommended 1.770 (.030 shim)
but they like to set them up tight...
Lets say this...I have the new duals...and with a .612 lift they want me to run them at 1.720 (.080 shim on stock heads). For the old springs they recommended 1.770 (.030 shim)
#35
Originally Posted by BLK02WS6
This post has me worrying, but with 70 passes on the motor I must be in pretty good shape.
Bret the older Cranes aren't as critical as the new ones are on the installed height. Like Fireball said we like to set them up a little tight. We like to run the springs about .050-.060 from coil bind for best performance and longevity.
So to answer your question: Depending on your cam specs we would like to see a .030 shim under your springs, assuming you are running stock heads and valves. If you cam is on the milder side then you are probably fine like you are. Hope this helps...
Paul
#36
So for my setup that the spring failed I should have been running with a .030 shim? I ordered another set of cranes so i'll see if there the new or old ones. I should use the appropriate shims when i install these? My cam specs are 228/230 .576/.593 112 lsa. Also, where can i get shims, do they have to be custom fabricated?
#37
Originally Posted by Paul @ Thunder
So to answer your question: Depending on your cam specs we would like to see a .030 shim under your springs, assuming you are running stock heads and valves. If you cam is on the milder side then you are probably fine like you are. Hope this helps...
Paul
Paul
#40
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From: Cecil County Raceway!!!
Originally Posted by SloppyRob
So for my setup that the spring failed I should have been running with a .030 shim? I ordered another set of cranes so i'll see if there the new or old ones. I should use the appropriate shims when i install these? My cam specs are 228/230 .576/.593 112 lsa. Also, where can i get shims, do they have to be custom fabricated?
http://store.summitracing.com/partde...CCA-4753&N=120