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What valve springs?

This is a discussion on What valve springs? within the Internal Engine forums, part of the LSx Technical Help Section category; I am putting a G5X1 cam in and Crane gold race variable ratio rockers. What valve springs should i put ...

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    Member stephen02ws6's Avatar
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    What valve springs?

    I am putting a G5X1 cam in and Crane gold race variable ratio rockers. What valve springs should i put in. The specs on the cam are 114 LSA, 228/232 Duration, 588/574 Lift and the rockers are 1.78 up to .300 lift then it goes to 1.7. I was going to get the comp cams beehive springs that are good up to .600 lift. Do you think i should get those or a different set?

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    cutting and welding mark21742's Avatar
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    the comp cams 918 springs should work great for you

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    cutting and welding mark21742's Avatar
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    the comp cams 918 springs should work great for you

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    I like the PAC 1518 springs better as they have surface treatments for extended life.

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    I'll just tell you what I heard... Beehive springs rob less power due to their design, although they still somehow serve the same purpose. Just don't ask me how it does it because I don't remember.

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    so the 918 comp beehive springs will be ok for my setup then? i didnt really think i need double springs.

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    Quote Originally Posted by stephen02ws6 View Post
    so the 918 comp beehive springs will be ok for my setup then? i didnt really think i need double springs.
    I'm not going to say which ones best match your cam setup, your cam mfg'r is better at telling you that, but I just know that style of spring is good. I would think that the double would be that much tougher to compress, therefore that much more hp loss... IMO, but I'm not very smart about this part of the engine.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by hot93rod View Post
    I would think that the double would be that much tougher to compress, therefore that much more hp loss
    the spring pressure works both ways, up and down, so the power you lose during spring compression, is gained back on the expansion of the spring

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    the 918 should be fine for you cam. im like dual springs my self but im pushing the .600 max of the 918 so im playing it safe.

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    Moderator Firebirdjones's Avatar
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    It would be best to ask your cam manufacture what spring they recommend, whether a dual spring, behive etc...really isn't as important as how much seat pressure and open pressure you need for a given cam design,,,thats what will dictate which springs to use. Some camshafts now have a softer closing rate to keep the valve from bouncing on the seat, therefore less seat pressure is required from the spring.

    Cams have come a long way in recent years and the springs are following.

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    Quote Originally Posted by mark21742 View Post
    the spring pressure works both ways, up and down, so the power you lose during spring compression, is gained back on the expansion of the spring
    Not entirely or we could get by with much weaker timing chain setups.

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    I would avoid the COMP 918's. A few bad batches have gone out.
    If you want a beehive design, go with the PAC's as mentioned before.



    I went overkill myself on a 226/234 554/575 112 with Patriot Duals....way back when.

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    it doesnt give a specific spring. it just says comp valvespring kit is recommended.

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    Quote Originally Posted by Mr. Luos View Post
    I would avoid the COMP 918's. A few bad batches have gone out.
    If you want a beehive design, go with the PAC's as mentioned before.



    I went overkill myself on a 226/234 554/575 112 with Patriot Duals....way back when.
    do you know which ones were the bad batch, ive heard with the blue stripe are the good ones and ive heard the ones without the blue stripe were the good ones?

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    Quote Originally Posted by mark21742 View Post
    do you know which ones were the bad batch, ive heard with the blue stripe are the good ones and ive heard the ones without the blue stripe were the good ones?
    Honestly, I have heard both as well.
    And I don't know 100% which is bad.

    From what I understand...just don't get them.

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    so are the PAC springs basically the same spring as the comps? where could i get them?

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by stephen02ws6 View Post
    it doesnt give a specific spring. it just says comp valvespring kit is recommended.
    I would wait until you get the camshaft in your hands then. There will be a cam card that comes with it. It will have the spring specs needed for that particular camshaft with required seat pressure, installed height, and usually even a recommended part number for the spring kit.

    That way you have something to go by if you want to change brand of springs. You will need to know spring specs anyway to setup install height and check seat pressure etc....

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    Quote Originally Posted by Mr. Luos View Post



    I went overkill myself on a 226/234 554/575 112 with Patriot Duals....way back when.
    i have the same spring, its better to have overkill.
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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    It would be best to ask your cam manufacture what spring they recommend, .
    you know, sometimes thats not always true.
    years back when i was getting cammed, i called futral motorsports to see what they would recommend.
    at the time i had 1.85 rockers and i had told them so.
    long story short, if i would of listened to them, i would of blew my motor in short order because the lift of the cam would of been way to much.

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    Quote Originally Posted by nhraformula View Post
    you know, sometimes thats not always true.
    years back when i was getting cammed, i called futral motorsports to see what they would recommend.
    at the time i had 1.85 rockers and i had told them so.
    long story short, if i would of listened to them, i would of blew my motor in short order because the lift of the cam would of been way to much.
    You raise a good point, you always need to keep in mind the current setup you have in place. 1.85 rockers sounds mighty big even for a stock cam... I would think that adding any more to the lift of the cam, and your piston would send them through the head, lol.

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