How often to rebuild lifters/cam opinion
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How often to rebuild lifters/cam opinion

  1. #1
    Senior Member H20MOFO's Avatar
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    Default How often to rebuild lifters/cam opinion

    I have a set of crower hippos. I am gonna guess 40 to 50 hours total on the motor. What is involved there? Send them to crower or? A few months back I posted a pic of a cam lobe that was wearing poorly...much to my surprise I pulled the intake today...and it doesn't look worse...it may actually look better. I will stick a pic or 2 up in a minute. Give me your opinions please.
    Last edited by H20MOFO; 10-23-2010 at 12:53 PM.
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    AKA Blownjet 468 Blowncat 509's Avatar
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    I had a cam that had been reground too many times, and it had gone thru
    the hardened area and started digging troughs in the lobes! sent my
    CROWERS back to them to be inspected, thinking they were gonna say
    I needed to replace them- to my surprise they sent them back and said
    "run 'em, they will be fine" was kinda sceptical, but I did, and they lasted
    10+ yrs! (didn't change em, sold boat) is the cam a CROWER?

  4. #3
    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by Blownjet 468 View Post
    I had a cam that had been reground too many times, and it had gone thru
    the hardened area and started digging troughs in the lobes! sent my
    CROWERS back to them to be inspected, thinking they were gonna say
    I needed to replace them- to my surprise they sent them back and said
    "run 'em, they will be fine" was kinda sceptical, but I did, and they lasted
    10+ yrs! (didn't change em, sold boat) is the cam a CROWER?
    The cam is a bullett....I swear it looks better now than it did. The general consensus of the prior thread was either that those 2 lobes may not have been hardened properly...or that I had an lifter bore alignment issue. Someone pointed out if that was the issue...I should have a firm talk with my machinist since the lifter bores are already bushed.
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    Senior Member wagspe208's Avatar
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    You replace them when the wheels start to get loose. Or, I would replace them evey 100 hours of operation. Are they mechanical rollers? Not Hyd? or are they Hyd?
    Wags
    They are expensive, but more expensive if there is a failure. I am a crower lifter fan personally. I have had 1 failure with them personally in 10+ years of my stuff. I think this is pretty damn good.

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    Just had one of the Crower solid rollers, (hippo), go bad in my 540 BBC ,(street car) for the second time. First time they had about 2175 miles on them, this time about 2800 miles on them. They replaced them free of charge the first time. had to pay to rebuild them this time. Also cam had to be reground both times.

  8. #6
    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by wagspe208 View Post
    You replace them when the wheels start to get loose. Or, I would replace them evey 100 hours of operation. Are they mechanical rollers? Not Hyd? or are they Hyd?
    Wags
    They are expensive, but more expensive if there is a failure. I am a crower lifter fan personally. I have had 1 failure with them personally in 10+ years of my stuff. I think this is pretty damn good.
    100 Hours or so thanks...fwiw they are not hyd. btw The guy that built my motor wouldn't take no for an answer on the crower hippos. 100 hours makes me good to go for a couple more years.
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    AKA Blownjet 468 Blowncat 509's Avatar
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    the crowers I ran weren't the hippo's, they were just the "Severe Duty"
    ones! (way before the hippo's came out) and I had 10+ years on them.
    was only about 5 or 6 outings a year, at about a drum +or- per trip of
    114oct union76 race fuel. and I would back off the rockers every last
    trip of the season. would never run anything BUT CROWERS in a solid
    roller application. except maybe jesels, or some other keyway style high-
    end type lifter. But then again, I'm one of those old school guys who also
    swears by the good ole' REV KIT, So let the flaming begin!

  10. #8
    Bostick Racing Engines six-oh-nine's Avatar
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    Quote Originally Posted by VD Cruiser View Post
    Just had one of the Crower solid rollers, (hippo), go bad in my 540 BBC ,(street car) for the second time. First time they had about 2175 miles on them, this time about 2800 miles on them. They replaced them free of charge the first time. had to pay to rebuild them this time. Also cam had to be reground both times.
    Well... every once in a while it is possible that a top shelf quality part goes bad just because of (who knows... part just failed)... but I become suspect of a situation where there is a failure of a top shelf part not just fails once... but twice. Under those circumstances... I'd tend to look for a reason for what is causing that part to have a failure. I mean if you run cheap offshore parts... then yes... it's quite understandable to have two failures in a row... but a Crower lifter... which many consider to be one of the top quality lifters available... then... (???) You know what I mean? On a street car app... first thing I'd want to know would be how much cam... spring pressures... and how much idling around... and what rpm is this thing going to?


    I won't assemble a roller engine unless it has Crowers... Isky... or Morel... I know other people have great luck with other stuff... but you know... I just can't afford to eat an engine because the customer wanted to cheap out on one of those parts that kills the most other parts when it fails. Typically during disassembly during a refresh... cleaning the rollers up and giving them a feel for smooth roll and no play will tell you whether one is about to become a failure. During use... having one valve all of a sudden needing more adjustment (going loose) then the others would be a significant reason to investigate further for a possible lifter issue. On my 489 (700 lbs. over the nose springs) I've gone 9 seasons driving the living piss out of the thing without a problem... lifters roll nice each time they come out for a service.
    Last edited by six-oh-nine; 10-23-2010 at 07:41 PM.
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  11. #9
    Bostick Racing Engines six-oh-nine's Avatar
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    Quote Originally Posted by Blownjet 468 View Post
    the crowers I ran weren't the hippo's, they were just the "Severe Duty"
    ones! (way before the hippo's came out) and I had 10+ years on them.
    was only about 5 or 6 outings a year, at about a drum +or- per trip of
    114oct union76 race fuel. and I would back off the rockers every last
    trip of the season. would never run anything BUT CROWERS in a solid
    roller application. except maybe jesels, or some other keyway style high-
    end type lifter. But then again, I'm one of those old school guys who also
    swears by the good ole' REV KIT, So let the flaming begin!
    Hey... I used to run one up until the last freshen up... just liked the idea of having constant pressure on the roller. But you know... just decided that all those extra springs and bushings and what-not were just more stuff to possibly go awry. Plus springs are much better now than they used to be back when the rev kits came out and were popular.

    I have a hard time knocking something that a person has had good luck with and is happy with on their own stuff... I mean it's your ride... only person who has to like what you do with it is you. You know?
    The Bostick®

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    AKA Blownjet 468 Blowncat 509's Avatar
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    right on brother!

  13. #11
    Senior Member mustangmark's Avatar
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    Default crower lifters

    Well, I can certainly add my 2 cents here. I have been down the "eaten lifter road" twice! It happen on my race car using comp cams solid roller lifters both times. I finally decided to switch to crower and have not had a problem sense. The crowers cost about twice as much as the comp cams lifters but it's cheap insurance in the long run. I had to learn it the hard way. If I had not been a cheap a** in the first place I would have saved countless hours pulling the motor and rebuilding it twice not to mention the $4,000.00 in machine work and parts (metal shavings running through a motor is never a good thing and wipes out a whole lot of stuff!)
    I'm currently building a 502 for my warlock and have done a lot of research on the morel hydraulic roller lifters. After talking to Bob Madera (aka:"RM Builder") I'm going to go that direction and have him custom grind a cam for me when I'm at that stage of the build.

  14. #12
    AKA Blownjet 468 Blowncat 509's Avatar
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    rmbuilder does know his camshafts! especially when your talking outdrive
    applications

  15. #13
    Senior Member mustangmark's Avatar
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    Default rmbuilder

    Quote Originally Posted by Blownjet 468 View Post
    rmbuilder does know his camshafts! especially when your talking outdrive
    applications
    Super nice guy also! Great to talk to, very knowledgeable and there to make sure you end up with exactly what you are looking for! Nothing but good things to say about him!

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    Another couple of areas to consider if you are having low lifter wheel/bearing life and camshaft wear is your oiling. A lot of engine builders will limit/restrict the oil supply to the upper end. The art of restriction helps keep oil in the main and rod bearings but restricts oil to the rockers, lifters and camshaft lobes. Also an oil that is too low of a viscosity for the application will agravate the situation. (when oil is hot, it becomes much thinner)

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