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Old 02-24-2004, 04:54 PM
84 Z28 Convertible
 
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Solid Cam Flat Tappet Springs

I order my heads form AFR with the part#8033 solid springs upgrade. The specs on the springs are: 145 seat, 365 open, and 1.14 coil bind, installed at 1.550. I'm thinking that this is too much pressure for my cam and need some advice on what I need to do to ensure I do not damage my cam. Here is the cam specs.
Lunati Solid Cam
280/284F10
247/251@.050
525/530 lift w/1.5
LSA 110
Centerline 106

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Last edited by DTL504; 02-24-2004 at 05:10 PM.
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Old 02-24-2004, 05:10 PM
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You can run that much spring pressure with a solid cam, BUT, you will have to be very careful during break in. For a street application, you could step your spring pressure to around 120 to a maximum of 130 lbs of seat pressure and somewhere around 330 lbs open pressure.

The springs on your heads are a competition type spring, for a street/strip car I would probably just put a different set of springs on there. Here is the set I would use, they are the Comp 986-16, they offer 130 lbs seat pressure @1.750 and over the nose is not too heavy, they are 1.440" diameter dual spring assembly. Easier on that cam.

If you choose to run the big springs, you can break the cam in with a lighter set of springs or purchase some 1.3 ratio break in rockers (which is a nice deal if you've got the extra money).


Or you can call Lunati and get their recommendation for that particular cam.
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Old 02-24-2004, 05:17 PM
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I agree with NAIRB, and I am in the same boat. I went with Isky springs part number 6105, they are 135 on the seat and 325 open. I also bought a set of break-in rockers so I can reduce the chance of a cam failure during break-in (they are 1.3 ratio). I also didn't want to have to remove and install the inner springs.

Lunati should give you spring specs for the cam you are using.

Unless you plan to really spin that thing a lot take it easy on the spring pressure for a street car.

The cam I am running is a little more aggressive than yours so I think the springs would work good for you. If you need more info on them let me know and I will go look it up (ie... installed height, coil bind)

Royce
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Old 02-24-2004, 05:25 PM
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That's not exactly a HUGE cam....but, it's still pretty 'healthy'. Your spring pressure seems a touch on stiff side, but not unuseable.

I'd set the springs up at 135lbs. on the seat....your open pressure isn't too bad. I don't think you'd actually hurt anything at 145lbs. on the seat though.

The springs will probably lose 10% after a while anyways.

You should break the cam in with the inner springs removed, so you don't wipe out the cam. Keep the rpm's under 3000. After you're broken in, put the inners back in.

Don't forget the GM EOS in the oil either!!
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Old 02-24-2004, 08:43 PM
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DTL504

is 1.550 the installed height or diameter? If it's the installed height and your coil bind is 1.14 then you need to change the installed height to 1.700 to have .560 lift springs which would also drop your seat pressure to around 120# 125#
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Old 02-25-2004, 05:59 AM
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1.550 is the diameter, If I do change spring I will probably go with these:
Isky-part#235-D Outer w/ Damper 1.260 .886
130 Lbs.@1.750" 320 Lbs.@1.200" .550 lift
or
ISKY part# 3105-D Outer w/ Damper 1.490 1.076 130 Lbs.
@1.700" 320 Lbs.
@1.200" .500
Because I would like to keep my Energizer Roller Rocker plus I do not want to clearance the Crane rocker.
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