Hydraulic or mechanical cam? - Reply to Topic
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Topic Review (Newest First)

  • 17-05-2010, 15:45
    Dusty

    Re: Hydraulic or mechanical cam?

    Thanks for the replies chaps...I reckon it's a mechanical cam as it has lash and sounds ok.

    All I know about the motor is that it came out of a Sportsman ET Camaro. The MSA log book is dated 1999 so it's been a race car for that long.

    It's race number was Sp ET 108
  • 17-05-2010, 12:06
    Torment

    Re: Hydraulic or mechanical cam?

    Quote Originally Posted by kapri View Post
    Otherwise all the performance cams I've used have had makers part number stamped on the end, depends if dropping the timing cover shows them up or they are on the back end meaning it needs pulling .
    the markings on my roller cam in the spare 302 chevy are on the rear end of the cam so it will probably need pulling...be careful of the bearings tho,they damage easy...
  • 17-05-2010, 07:22
    kapri

    Re: Hydraulic or mechanical cam?

    Otherwise all the performance cams I've used have had makers part number stamped on the end, depends if dropping the timing cover shows them up or they are on the back end meaning it needs pulling .
  • 17-05-2010, 07:09
    Dusty

    Re: Hydraulic or mechanical cam?

    Quote Originally Posted by Plumpcars View Post
    Dusty you can't press the hydraulics down. If you run through a valve adjusting sequence, ie each lobe on base circle of cam, do you have lash at all of them? By lash I mean an actual clearance measureable with a feeler strip? If so it will run with a nice mechanical click whilst running, something like a sowing machine if it is solid. If it is hydraulic it will sound like a bag of old nails! If there is no measurable clearance then a solid cam would probably not run or certainly extremely roughly if it did so.
    You really need to push him for a cam number to get the clearances etc.
    I've e mailed him and left phone messages (as has Deb) since we bought the Camaro last June and realised that some of the paper work he showed us was missing.

    TBH it didn't seem that important as the car was doing exactly what we'd been told.

    Now that the motor is in a street car (my coupe) it seemed more important.

    I guess I could pull the timing cover and see if there's any marking on the end of the cam but the motor doesn't leak...and probably would after I messed with it.

    I think if Mark was going to pass the stuff on, he would have done it by now....I can't be bothered to go into the depths of High Wycombe to find out why he's being a pratt.
  • 17-05-2010, 05:39
    Plumpcars

    Re: Hydraulic or mechanical cam?

    Dusty you can't press the hydraulics down. If you run through a valve adjusting sequence, ie each lobe on base circle of cam, do you have lash at all of them? By lash I mean an actual clearance measureable with a feeler strip? If so it will run with a nice mechanical click whilst running, something like a sowing machine if it is solid. If it is hydraulic it will sound like a bag of old nails! If there is no measurable clearance then a solid cam would probably not run or certainly extremely roughly if it did so.
    You really need to push him for a cam number to get the clearances etc.
  • 16-05-2010, 18:13
    satan

    Re: Hydraulic or mechanical cam?

    Quote Originally Posted by Dusty View Post
    Because, despite repeated attempts, the guy that sold us the car has failed to supply the spec sheet.

    Thanks for the replies, all.
    mmm, 16mm drill held over one of the knees does it for me[in the very rare instance of having to actually go furtherdont forget the pilot hole first]
  • 16-05-2010, 16:25
    Dusty

    Re: Hydraulic or mechanical cam?

    Quote Originally Posted by satan View Post
    with respect, how come you dont know whats inside this engine
    Because, despite repeated attempts, the guy that sold us the car has failed to supply the spec sheet.

    Thanks for the replies, all.
  • 16-05-2010, 11:13
    satan

    Re: Hydraulic or mechanical cam?

    Quote Originally Posted by Dusty View Post
    I took a rocker cover off today to look at my rockers.

    The heads are World Products with roller rockers.

    The valves that are closed have a little bit of play (lash?).

    I pushed down on the pushrod end of the rocker with an open valve...it seemed solid. If this was hydraulic, I'm told that I would have been able to push down on the rocker.

    I'm guessing that this is a mechanical cam so I need to adjust the lash. Am I right?
    with respect, how come you dont know whats inside this engine
  • 16-05-2010, 10:43
    blackpopracing

    Re: Hydraulic or mechanical cam?

    Hydraulic are pretty solid Dusty, even when not running. I had to squeeze mine down in a vice to eject the oil many years ago when I did some.
  • 16-05-2010, 09:54
    Torment

    Re: Hydraulic or mechanical cam?

    possibly,tho i doubt it as think of the pressures on the pushrod when running..also if you can push them down then my massivly uneducated guess would be theres something wrong...and your a strong bugger..

    i know ,i know , i am a mind of useless info..
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