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Edelbrock RPM springs

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Discussion starter · #24 ·
I was just about to reply and say that I saw that in your earlier post. Sorry. So lets see.. 1.80 IH changed to 1.70 IH would be .1 x 281 = 28 lbs + 115# = 143 seat. 28lbs + 264#open @ .530 lift = 292open.

143#seat/ 292#open @ .530 lift

Think that will work?
 
#27 ·
My only question is, if this is only a street car/show car that you want a little lope out of and a little bit of low end torque to have some fun with, why waste all the money on a hydraulic roller cam set up? Just buy a hydraulic flat tappet cam and use the springs on the heads that you have already. For your application, your not going to notice enough of a power difference to justify the cost, a hydraulic flat tappet will meet all your goals easily and save you around $500-600.
 
Discussion starter · #28 ·
I have a ZZ4 and theres already tons of low end torque. I want more mid to high. Its already set for a roller cam and the lifters are still good. My only cost is the cam and potentially the springs. And as far as power, the cam which is a little bigger than the Hot Cam makes another 30-35 for about $250. The springs, if I have to replace them, are $90 with retainers, locks. What is this $500-$600 that you're talking about?
 
Discussion starter · #30 · (Edited)
RogersPerformance,

Also, do you have the number for Pioneer? They have a 1.26OD spring for my L98 heads that have 135#seat and 360# open @ .600 lift and I'd like to see what the pressure would be @ .530lift. Then, I'd like to see how this compares to the SDPC heavy duty spring which is 1.25OD, 130#seat, 350#open .550 lift. Basically I'm trying to see which will have more open pressure @ .530.

Also, do you sell a 1.25 and a 1.45OD (I have two sets of heads) spring with the pressures I'm looking for?
 
#32 ·
You didn't mention anything initally about a ZZ engine, so I assumed you were using a older engine. To change from a hydraulic flat cam to a hydraulic roller is about $600 more to do. Make sure your lifters can handle the lift your planning to run. I'm not sure what the safe lift is, but at a certain point you'll have to change lifters as well bringing your cost way up.
 
#33 ·
I don,t have my pioneer book at home so when i get in the shop tomorrow i will post it for you.

Yes valve length will have an effect on what springs will fit in your heads.

If you have a install height that is say 1.900 but you only need 100# on the seat and 280#open you will not find a spring to fit that.

So you need to come up with a way to reduce your install height .100 to get to 1.800 and then you can use the spring.

You need to remember any combo you use to change install height or get pressure wright you need to make sure the spring is retained at the bottom and at the retainer you don,t want the spring dancing around.

I have a lot of after market heads that come in to my shop that were bought assembled from the big names and their is shims under the spring and some times as much as .100 to get what they need and the spring is dancing all over the place. This is the only way they can sell the heads cheep.
 
Discussion starter · #35 · (Edited)
Rogers Performance,
I called Pioneer and they cross referenced the 5767 RPM spring and told me it was a 18105. Then he said it was a .540 lift?!? He said that he didn't have a free length height available. Then he said this is a 245#open pressure at 1.32. What is this lift? Another website has these springs listed as #320 at 1.21". Is there a forumula to verify this because this math below doesn't come out right.

IH=1.80
L= .575
---------
VO= 1.225

FL 2.21-VO 1.225= .985. So .985x SR 281 = 276 @ .575 lift. Thats waaaay off. Thats about 50# off.
I'm exhausted with this. I think I'll just have my cylinder head guy check the springs and see if he can shim them to what I need without closing in on coil bind.
 
#36 ·
You need to know the free length the install height and the spring rate and spring coil bind height.The spring rate tells you how many lbs it gains for every inch it moves.

Your install height you told me was 1.800 - your lift .529 = the install height of the spring at your open lift.=1.271
 
Discussion starter · #37 ·
You were given all of those numbers by Pioneer but it just doesn't seem like the right info because Edelbrock says with an installed height of 1.80, I should have 320# @ .575 lift. All of the numbers you were given by Pioneer doesn't add up to that kind of open pressure at that lift. The numbers are there and equations are there but the final product isn't what Edelbrock posts. So...I'm confused. I'll just have my machinist measure the specs and go from there. If I can shim a little then I'll do it. If not, then new springs.
 
Discussion starter · #39 · (Edited)
I have a Lazer cam not a Voodoo cam. That Voodoo spring is for a 1.26OD and it only has 110 pounds on the seat. If I can't get RPM spring to work then I'm looking for something to drop right into the Edelbrock head. (1.43-1.48-ishOD) with about 130 on the seat. As far as my other heads I'm gonna use the SDPC2000 1.25OD 130seat, 350# @ .550.

Being on a budget, my whole reason for this thread was to save a potential $130 for springs, retainers, and locks.. and then another $35 for my machinist guy to install them and measure them professionally.
 
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