918`s vs double springs package
10-23-2006, 12:22 PM
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918`s vs double springs package Hi
I`m planning to go Beehive comp 918 (using stock retainers and lucks means saving money right?) my reasons are and I need correction as this is the idea that I have from reading and not sure:
1-they are more durable than double springs (more springs life milage with the same cam) <===a cam with 580-600 lift with the double springs being rated to 650 lift
2-they will make a little more power from the reduced valvetrain weight)
3-power band should be the same since the steel retainers beehive are almost the same weight of the titanium retainers on the double springs. (this might be only true to bbc changed over to beehive)
I`m planning to go Beehive comp 918 (using stock retainers and lucks means saving money right?) my reasons are and I need correction as this is the idea that I have from reading and not sure:
1-they are more durable than double springs (more springs life milage with the same cam) <===a cam with 580-600 lift with the double springs being rated to 650 lift
2-they will make a little more power from the reduced valvetrain weight)
3-power band should be the same since the steel retainers beehive are almost the same weight of the titanium retainers on the double springs. (this might be only true to bbc changed over to beehive)
10-23-2006, 01:17 PM
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Originally Posted by Bader-X
Hi
I`m planning to go Beehive comp 918 (using stock retainers and lucks means saving money right?) my reasons are and I need correction as this is the idea that I have from reading and not sure:
1-they are more durable than double springs (more springs life milage with the same cam) <===a cam with 580-600 lift with the double springs being rated to 650 lift
2-they will make a little more power from the reduced valvetrain weight)
3-power band should be the same since the steel retainers beehive are almost the same weight of the titanium retainers on the double springs. (this might be only true to bbc changed over to beehive)
I`m planning to go Beehive comp 918 (using stock retainers and lucks means saving money right?) my reasons are and I need correction as this is the idea that I have from reading and not sure:
1-they are more durable than double springs (more springs life milage with the same cam) <===a cam with 580-600 lift with the double springs being rated to 650 lift
2-they will make a little more power from the reduced valvetrain weight)
3-power band should be the same since the steel retainers beehive are almost the same weight of the titanium retainers on the double springs. (this might be only true to bbc changed over to beehive)
i agree with what you have said.... if going over .600 lift and taking the car up over the stock limiter I would suggest you consider dual springs. Otherwise the 918's are good up to .600 as a rule of thumb. Cheap insurance.
10-23-2006, 04:05 PM
#3
I would say it would depend on what lobes your cam has. If you're running some XE-R lobes or something of the sort with higher ramp rates, then you might want to consider the dual springs. It all depends on how often you like changing your springs and the risk you're willing to take of one breaking.
10-24-2006, 03:51 AM
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so with a cam with a 600 lift and lower they`re enough even if on xe-r lobes?
all three points are correct?
say I order the t-rex on a 590 int 590 ext lift all I have to change is the springs(918) stock lucks and stock seals?
all three points are correct?
say I order the t-rex on a 590 int 590 ext lift all I have to change is the springs(918) stock lucks and stock seals?
10-24-2006, 03:59 AM
#7
Why would you want to order the t-rex on that lift grind though? Sounds like if you are trying to get around having to get new springs that cam is not for you.
This is just my opinion on cams that go up that high: I would have a titanium retainer backing it as well as shims if (you stick with 918's). This will help out in the cases of valve float. You will have about 200-300 rpms of safety where the stockers would mushroom and fail....(this is only in severe cases of course).
Your better off with like a magic stick v3 or something like that. FWIW I run my 244/248 cam on shimmed 918's. They will go to .615 lift. It is a marketing thing for Comp Cams if I am not mistaken. They are undercutting the 918's for selling the 921 springs to users with +.600 lift cams.
All I am telling you is that you might want to really do your research on cams and valvetrain components before you plunge into this territory with mixed speculations.
This is just my opinion on cams that go up that high: I would have a titanium retainer backing it as well as shims if (you stick with 918's). This will help out in the cases of valve float. You will have about 200-300 rpms of safety where the stockers would mushroom and fail....(this is only in severe cases of course).
Your better off with like a magic stick v3 or something like that. FWIW I run my 244/248 cam on shimmed 918's. They will go to .615 lift. It is a marketing thing for Comp Cams if I am not mistaken. They are undercutting the 918's for selling the 921 springs to users with +.600 lift cams.
All I am telling you is that you might want to really do your research on cams and valvetrain components before you plunge into this territory with mixed speculations.
Last edited by orangeapeel; 10-24-2006 at 04:04 AM.
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10-24-2006, 07:51 AM
#9
Originally Posted by vettenuts
Are you saying the stock retainers would "mushroom" (deform) or they won't RPM as high?
10-26-2006, 11:53 PM
#11
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On my car pre-cam/spring swap, I saw valve float at 5800rpm. If you wish to rev to anything over 6000 consistently, then at the very least, 918s are for you.
The cam choice will determine which spring set-up you should use.
Good luck with it,
Macca
The cam choice will determine which spring set-up you should use.
Good luck with it,
Macca
10-27-2006, 01:10 AM
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any reason not to go with a t-rex with a 575-590 lift with a 918 and rev to 6800-7000 and shift @ 6500-6700?
like it will sure float with that rpm and cause damage
or
the springs won`t handle the aggressive designe of the t-rex
or anything else?
like it will sure float with that rpm and cause damage
or
the springs won`t handle the aggressive designe of the t-rex
or anything else?
10-27-2006, 07:11 AM
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if you are going to spin it to 7k you will need a decent sized stick because a small one will be out of breath by then.if you are set on spinning it to 7k something like the ms3 or similar with dual springs is what you need.
10-27-2006, 08:46 AM
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Originally Posted by GuitsBoy
The extra piece of mind, plus the titanium retainers make the gold dual springs worth looking into on even mid sized cams such as yours and mine, IMO. I dont think youll give up any measurable ammount of power.
10-27-2006, 02:35 PM
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Originally Posted by PREDATOR-Z
smaller duration higher lifts cams will produce more power than big duration lower lift ones.
will beat a
242 248 575 575 110 same ICL
in a race say from a roll both cars with the same mods assuming they were very close in the same race distance!
if that was true then I know nothing about cams
10-27-2006, 04:57 PM
#18
Originally Posted by Bader-X
so a 220 220 650 650 110
will beat a
242 248 575 575 110 same ICL
in a race say from a roll both cars with the same mods assuming they were very close in the same race distance!
if that was true then I know nothing about cams
will beat a
242 248 575 575 110 same ICL
in a race say from a roll both cars with the same mods assuming they were very close in the same race distance!
if that was true then I know nothing about cams
