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  1. #31
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    Quote Originally Posted by tuf72 View Post
    what about tight lash solid rollers or are they just hydraulic lobes anyway?
    No they just have less of a lash ramp on the lobe still an SR lobe, that would be the easier solution and you wont have to worry about limitations of the hydraulic lifter at RPM.

    You can put hydraulic roller lifters on a solid roller lobe but you'll increase the seat duration drastically..

    You just need an intake lobe with around 250@50thou and between .600-.650" lift exhaust I'd give it more duration for an earlier exhaust valve opening of 265@50thou to make it rev up.

  2. #32
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    Quote Originally Posted by paulzig View Post
    No they just have less of a lash ramp on the lobe still an SR lobe, that would be the easier solution and you wont have to worry about limitations of the hydraulic lifter at RPM.

    You can put hydraulic roller lifters on a solid roller lobe but you'll increase the seat duration drastically..

    You just need an intake lobe with around 250@50thou and between .600-.650" lift exhaust I'd give it more duration for an earlier exhaust valve opening of 265@50thou to make it rev up.
    I run cower hippos on a billet hydraulic core and lash them .004 and .006 few years new and the lash has not moved if I have a 236@50 hyd lobe with a solid lifter would I pick up duration of loose due to the lash ?

  3. #33
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    Yeah, when there is lash the valve isnt moving until you take up that lash.

    If you lash a hydraulic lobe it will act like less seat duration than if you had a hydraulic lifter on it... Thats why you cant directly compare, lets say a , 250@50thou HR vs a 250@50thou SR with .020" lash, the hydraulic 250 will act a lot 'bigger'

    These days you can get lobes that are 'tight lash' so no real need for that sort of thing really.

  4. #34
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    Quote Originally Posted by paulzig View Post
    Yeah, when there is lash the valve isnt moving until you take up that lash.

    If you lash a hydraulic lobe it will act like less seat duration than if you had a hydraulic lifter on it... Thats why you cant directly compare, lets say a , 250@50thou HR vs a 250@50thou SR with .020" lash, the hydraulic 250 will act a lot 'bigger'

    These days you can get lobes that are 'tight lash' so no real need for that sort of thing really.

    Yeah when I spoke to a cam guy he said that if you look the tight lash solid grinds are just old big hydraulic lobes but that was a while ago now its worked well so far made good power the rockers ended up at 1.7 ratio so it all worked out in the end I only run on the 420lbs nose on the seat pac springs with 170 on the seat heaps of street kms so its just as good as a hydraulic roller lighter rockers retainers and thinner stem valves all help but mine was a budget.

  5. #35
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    Quote Originally Posted by tuf72 View Post
    I only run on the 420lbs nose on the seat pac springs with 170 on the seat
    Thats another reason people do this, solid lifter on a hydraulic lobe. The hydraulic lobe profiles arent as aggressive as their solid counterparts so you can get away with less spring pressure. its good for when you get the ducile iron core which cant take as much pressure without chewing the cam up etc.

  6. #36
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    I dont really see the fascination doing it, when you can get lobes that will do the job with a lifter it was designed for.. Have a look at the comp cams master lobe list theres 100's and 100's of lobes to pick from...

  7. #37
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    I'm running a set of isky EZX solids on a Comp HR284 in one of my vehicles. Sure, it's noisier than a traditional Hyd setup but seems to work ok. The valvetrain setup in that is conventional .

  8. #38
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    Quote Originally Posted by russxr67 View Post
    I'm running a set of isky EZX solids on a Comp HR284 in one of my vehicles. Sure, it's noisier than a traditional Hyd setup but seems to work ok. The valvetrain setup in that is conventional .
    You have the lash really tight on it?

    If you have a HR lobe and its ramp is at .004 or .006 with the Cleveland 1.73 rocker you'd have to be no more than .004x1.73 = .00692" lash or .006x1.73= .01038" lash or you'll be off the ramp. It'll screw with the velocity curve on the lobe.

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