Single or double springs for a street car
06-30-2009, 08:36 AM
#1
Single or double springs for a street car I'm ordering heads today but have a couple of questions. The cam I will be using is .580 lift and I just put .600 rated bee-hives on my stock heads. The new heads will have .650 rated double springs which may/may not clear my 1.85 rockers. As an option I can knock off $200 and get the heads without springs... install my bee-hives on the new heads. Would their be any benefit to the higher rated springs given my lift or to the bee-hives maybe being easier on the valvetrain? Just curious also those guys running >.600 lift daily or lots of mileage how you are making out with doubles.
06-30-2009, 09:21 AM
#3
.600 rated. Scoggin said not much over .600 when I asked him about them. I'm at .580
http://www.sdpc2000.com/product/SDL1...S1Setof16.aspx
http://www.sdpc2000.com/product/SDL1...S1Setof16.aspx
06-30-2009, 09:25 AM
#4
You need to factor in the new lift ratio if you have not already. Almost all LS camshafts are rated at 1.7 rocker ratio. if you are using 1.85s and have not compensated with recalculating the lift, then you should do so and then make your decision.
06-30-2009, 09:28 AM
#5
Duals are always better than single springs..very seldom do both inner and outer springs break at the same time...keeps a valve from dropping and causing a expensive repair...those dual springs should clear your rockers..the comp 918 spring has had numerous bad batches of springs and I would choose a different beehive spring than the comp 918 if you feel that is what you want...PAC has a good beehive spring..
06-30-2009, 09:34 AM
#6
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I would worry more about what would happen if you broke a beehive than "will a double spring stress my valvetrain more" there's always a safty factor w/a second sping in place!
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06-30-2009, 01:41 PM
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The dual spring setup should last a long time on the .581 lift. Less maintenance just install and forget them. I bet you'll still be running the same dual springs 5 years from now without a care in the world. Good luck.
06-30-2009, 03:02 PM
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06-30-2009, 03:37 PM
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No hijack attempt here, but are there any inherent advantages to keeping a good quality single beehive spring over a dual?
I.E., will a single beehive spring allow a higher rev (valvetrain weight) over a dual? Not to be a lightweight here, but are dual springs noisier than singles?
OP, hope you do not mind the additional clarification and question added.
Thanks.
..WeathermanShawn..
I.E., will a single beehive spring allow a higher rev (valvetrain weight) over a dual? Not to be a lightweight here, but are dual springs noisier than singles?
OP, hope you do not mind the additional clarification and question added.
Thanks.
..WeathermanShawn..
06-30-2009, 04:07 PM
#15
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06-30-2009, 04:49 PM
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Typical lobe lift of a cam is in the .300-.380" ballpark.
It seems you are basing this on the "advertised lift" which assumes 1.7 rockers will be used.
With 1.85 ratio rockers, you are now looking at .631" actual lift.
Only beehives I know of that will handle that would be the PAC 1518s.
It seems you are basing this on the "advertised lift" which assumes 1.7 rockers will be used.
With 1.85 ratio rockers, you are now looking at .631" actual lift.
Only beehives I know of that will handle that would be the PAC 1518s.
06-30-2009, 05:15 PM
#17
Typical lobe lift of a cam is in the .300-.380" ballpark.
It seems you are basing this on the "advertised lift" which assumes 1.7 rockers will be used.
With 1.85 ratio rockers, you are now looking at .631" actual lift.
Only beehives I know of that will handle that would be the PAC 1518s.
It seems you are basing this on the "advertised lift" which assumes 1.7 rockers will be used.
With 1.85 ratio rockers, you are now looking at .631" actual lift.
Only beehives I know of that will handle that would be the PAC 1518s.
