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Old 05-20-2013, 08:36 PM
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Max spring pressure for "unknown" hydraulic lifters

Hello,

Background

Bought a el camino with a 383 stroker; all unknown parts / engine builder.

Didn't run at first (rich, soaked plugs); traded in the Holly 750 double pump (leaking everywhere) and the dominator intake and for a eddlebrock 750 + peformer.

Msd 6al+new dizzy.

Adjusted springs / metering rods; car RAN GREAT! Cam sounds fairly stout; idles at 1200rpm with 0 vacuum for brakes at idle. That said; the car is a complete dog; feels like a 305... ie: Barely break the tires loose on sand.

lifters where hydralic tappet; nothing special.


Current issue:


Old heads were cart iron smog 76cc junkers.

Had a set of brodix Dirt SPEC in garage; fully assembled for a dirt mod; threw on the car one afternoon.

Adjusted the crank to TDC; Exh 1, 3, 4, and 8 / Int 1, 2, 5, and 7.

Rotated the crank 360; and all the hydraulic lifters on the exhaust valves popped.

Spring pressures are at 240 lb Closed, 550 lb Open; would this be enough to pop a cheapo unknown lifter (or even worse; wipe a cam lobe)?

Or do you think valve hit the piston and I need to tear the heads off?

Should i buy a good roller cam and lifters?

note: Pistons where dished with valve reliefs; looked just like stock mustang pistons.

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Old 05-20-2013, 08:43 PM
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MAX seat pressure on a flat tappet hydraulic street/strip cam is 145. Closer to 120 is better.. 240 is roller stuff. Will wipe a flat tappet lobe in a heartbeat..
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Old 05-20-2013, 08:50 PM
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ack

Looks like I am buying a cam then
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Old 05-20-2013, 09:57 PM
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make the cam a nice little roller
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Old 05-20-2013, 10:24 PM
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o

Yep; thinking something on the mild'ish for a solid roller cam.

Hoping to avoid clearance problems by keeping lift under .600 and duration something reasonable (having some vac at idle is a added bonus).

ie:
Lunati#638-40120730LK
Voodoo Solid Roller Camshaft and Lifter Kit
Chevy Small Block
Lift: .555''/.566''
Duration: 261 Deg /267 Deg
LSA: 110 Deg
RPM Range: 2500-6500

Not knowing the cam was bothering me anyways; gives me a good excuse to change out.
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Old 05-20-2013, 10:38 PM
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check this out
111313-08 NA 279 279 247 247 .585 .585 108 104 .022 .022 1,2,5
3000-7400 Fair idle, Hot Street/Strip. Good mid-range power. 10.0:1 CR, 3400+ stall
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Old 05-20-2013, 10:47 PM
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Brand:COMP Cams

Manufacturer's Part Number:K12-443-8

Part Type:Camshaft and Lifter Kits

Product Line:COMP Cams Xtreme Energy Retrofit Cam and Lifter Kits

Summit Racing Part Number:CCA-K12-443-8



UPC:036584036760

Cam Style:Hydraulic roller tappet

Basic Operating RPM Range:2,800-6,100

Intake Duration at 050 inch Lift:242

Exhaust Duration at 050 inch Lift:248

Duration at 050 inch Lift:242 int./248 exh.

Advertised Intake Duration:294

Advertised Exhaust Duration:300

Advertised Duration:294 int./300 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:0.540 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:0.562 in.

Valve Lift with Factory Rocker Arm Ratio:0.540 int./0.562 exh.

Lobe Separation (degrees):110

Grind Number:CS XR294HR-10
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