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Author
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Topic: Hydraulic Lifter pump-up
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oddrodtodd
Journeyman Posts: 26
From: Belgrade, MT, 59714, USA
Registered: Aug 2004
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posted 10-06-2004 05:29 PM
   
I will be running a Crane Hi-Intensity cam that has a 2500-5500 basic RPM range in my Cleveland. I'll also be running the proper valve springs (95 lbs. on seat) as supplied by Crane. My question is, I have a brand new in-the-box set of TRW VL-35 valve lifters. For this RPM range, is there any reason I can't use these instead of the anti pump-up lifters? It seems to me I ran this same lifter in a small block 302 and spun 6000 RPM without valve float. I've been told that the proper valve spring pressure is more critical than whether or not you've got anti pump-ups. In this RPM range anyway. Anyone care to comment?
Todd ------------------
Todd & Judy Noel
'74 Pinto-302
'86 Mustang GT 5.0
'76 F250-460 Trailering Special
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SteveLaRiviere
Administrator Posts: 43395
From: Saco, Maine
Registered: May 99
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posted 10-06-2004 06:05 PM
I agree with you. Those springs shouldn't cause a problem with stock lifters. If they're brand new, I'd use them.One caveat, though. If you have a quality problem with the cam, you know Crane will deny responsibility saying you didn't use their lifters. ------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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oddrodtodd
Journeyman Posts: 26
From: Belgrade, MT, 59714, USA
Registered: Aug 2004
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posted 10-06-2004 07:02 PM
I guess what I'm really wondering is will I notice any more valve float with stock replacement lifters then I would otherwise experience if I was using anti pump-ups. In this (5500-6000) RPM range.
Thanks, Todd[This message has been edited by oddrodtodd (edited 10-06-2004).]
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SteveLaRiviere
Administrator Posts: 43395
From: Saco, Maine
Registered: May 99
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posted 10-06-2004 07:07 PM
With 95 lbs at the seat you'll only have about what, 200 lbs at the nose? You won't want to spin it over 6000 anyway, right?------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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oddrodtodd
Journeyman Posts: 26
From: Belgrade, MT, 59714, USA
Registered: Aug 2004
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posted 10-07-2004 12:54 AM
You're probably right, this isn't a ton of valve spring, but sufficient for the application:
Crane single-w-damper #99837 is rated 90lbs. on the seat at 1.828" installed height. 262lbs. open at 1.328" (.500 lift). They have a spring rate of 341 lbs./in. This cam has .509 & .519" lift, so the open pressure will be around 265-270lbs. Should be more than sufficient for 6000 RPM.
Todd
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Moneymaker
Administrator Posts: 26242
From: Lyons, IL, USA
Registered: May 99
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posted 10-07-2004 03:29 PM
Those are re-packaged Eaton lifters in reality and they are good to 6500 RPM.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
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NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
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Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
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Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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oddrodtodd
Journeyman Posts: 26
From: Belgrade, MT, 59714, USA
Registered: Aug 2004
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posted 10-08-2004 10:41 AM
quote:
Originally posted by Moneymaker:
Those are re-packaged Eaton lifters in reality and they are good to 6500 RPM.
Thanks Moneymaker. That is really what I wanted to know!
Todd
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