500 Hp Carbed-replacement springs
 

What is the best spring to use? I have listed all of the springs I know of to use. I included the costs too. Any thoughts?

Seems to me a lot of people have used the Comp 929 springs. They seem to be a little light in load pressure.

I think the Isky are supposed to a better spring but originally thought the cost was in the $400 range.

Original Equipment
Crane Cams 99896 Cost ???
Part # 99896
O.D. of OuterDia. 1 1.540
I.D. of OuterDia. 2 1.140
I.D. of OuterDia. 3 .760
Seat Load 150 @ 1.900
Open Load 560 @ 1.150
Coil Bind 1.085
Rate(Lbs./In.) 528


Comp Cams 929 Cost $140
Part # 929
O.D. of OuterDia. 1 1.535
I.D. of OuterDia. 2 1.135
I.D. of OuterDia. 3 .754
Seat Load [email protected]
Open Load [email protected]
Coil Bind 1.160
Rate(Lbs./In.) 437


Comp Cams 953 Cost $140
Part # 953
O.D. of OuterDia. 1 1.539
I.D. of OuterDia. 2 1.137
I.D. of Outer Dia. 3 .747
Install Height 1.900
Seat Load 148 @ 1.900
Open Load 456 @ 1.250
Coil Bind 1.085
Rate (Lbs./In.) 474


ISKY Spring 8205 SP Cost $190
Part # 8205SP
O.D. of OuterDia. 1 1.530
I.D. of OuterDia. 2 1.005
I.D. of OuterDia. 3 .730
Seat Load 150 @ 1.900
Open Load [email protected]
Coil Bind 1.150
Rate(Lbs./In.) 480

...

For a stock or even a modified 500 hp, the 929 is more than enough spring pressure. That engine doesn't need over 400# over the nose at 5200-5400 rpm.
Eddie

Someone made a comment they lost 7lbs on the comp 929 springs after one season of running. Dopes that seem right?

I don't want my springs to only last me 1-2 seasons. IO would like to get a fdew more before I have to do a complete rebuild on the 500's...then I want to make bigger power.

All depends on his setup. That is Rob's engines you are talking about. I know he turns them pretty hard (6000 rpm or more), so they will not last as long in his setup as they will in yours. They will easily last you 250-300 hours in a stock 500. You can use the Comp 929 or the Isky 8005.(?)
Eddie

I agree with eddie. Additionally, just set the seat pressure up 5 or so pounds to account for loss in spring tension from new. That is what I do anyway.

I use the 953 comp cams. Had good luck.

Would the Comp 929 springs work in a stock 502MPI ? Are there any other recomendations ?

Isky 8005sp !!!!!

Agree on the Isky's 8005 for the 502 MPI.
Eddie