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Author
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Topic: h.v. oil pumps and anti pump lifters
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Mark From Detroit
Journeyman Posts: 29
From:
Registered: Apr 2001
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posted 07-26-2001 08:44 PM
   
I still have valetrain noise after installing Crower roller rockers on my 351C at 2800 rpm and higher. It sounds like the rockers are out of adjustment. After calling Crane several times explaining the story of my problems and checking all possibilities including oil presure which was 80 psi they say the hv oil pump could be airating the oil causing my problem and want me to change it to a stock pump and call them back. I disagree because the last 100 hv pumps I installed I never had this problem. I think it is the anti pump lifters that came with the cam that are bleeding down fast causing my problem. Has anyone had a similar problem with a hv pump or anti pump lifters?
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unklshu
Gearhead Posts: 682
From: San Bernardino, Ca
Registered: Jul 2001
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posted 07-26-2001 08:57 PM
Aren't the fast bleed lifters prone to more valve train noise or is the noise beyond what you would expect?joe
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Mark From Detroit
Journeyman Posts: 29
From:
Registered: Apr 2001
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posted 07-26-2001 09:55 PM
The lifters I am using are not the High Intensity or Fast Bleed lifters. Crane calls them Anti Pump Performance hyd.lifters."The bleed rate of this lifter is maintained by micro tolerance that prevent pump up and limiting full rpm potential". That is a quote from there catolog. I really could not get a straight answer from them but they said there should be no noise with this lifter. I am not 100% positive this is the problem and hoping someone has an experience similar to mine or can shead some light on the matter.
Mark
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 07-27-2001 01:04 AM
Have they verified that they actually packaged the correct lifters in the box? BS on the oil pump. Two reasons... 1. If the pump was 'airating' that oil bad enough to make lifter noise it sure wouldn't be worth a **** on the mains, rods, and cam bearings. 2. Again, if the pump was 'airating' the oil that bad you wouldn't have close to 80lbs pressure. Gasses compresses, liquids don't, all the bubbles in the oil would limit the observed oil pressure. Tell the tech guys to take a flyer and send you some new parts. ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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clevelandstyle
Gearhead Posts: 1035
From: Connersville, IN
Registered: Jul 2001
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posted 07-27-2001 10:14 PM
The quote from the catolog about "anti pump" and "micro tolerance" is just fancy engineering wording which means "fast bleed"! It's all the same.
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Mark From Detroit
Journeyman Posts: 29
From:
Registered: Apr 2001
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posted 07-27-2001 10:41 PM
Crane does have a lifter called High Intensity (formerly called fast bleed) which is a variable duration lifter.
Mark
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7DMACH1
Gearhead Posts: 2359
From: PHILA. PA.
Registered: Feb 2001
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posted 07-28-2001 09:12 AM
I have the same noise in my 351c. I am running Motorsport roller rockers.I have been told that the noise is because the ramp speed of the cam. I have heard a lot of engines do this at a certain rpm. I am running a Lunati cam, 285/560, 235@50 with a 104 center line and a 108 lobe seperation. I have been told this noise is normal for the cam and don't worry about it. RAY------------------
1970 MACH 1 351C 4SPD
1986 CAPRI 5.0 5 spd.
2001 LINCOLN LS V8
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