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tips, technology, tools and techniques related to vehicle driveline components

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roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Elephant foot/Mushroom lifters
Posted by: roverman
Date: June 06, 2012 02:27PM

Specifically type 1 VW. Legal in GT-2, "should" allow 45% faster ramps over .842" flat tappet. 30" radius-yes ? Anybody using these ? .5 deg. lobe side angle ? Regrind a roller cam ? So many questios, so little time. Thanks, roverman.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Elephant foot/Mushroom lifters
Posted by: BlownMGB-V8
Date: June 10, 2012 01:56PM

Art, have you heard anyfhing more about the composite litters? We really have no hard data on them but the rumors seem pretty fantastic. Durable, quiet, no need for zinc additives, etc.

I just wonder how they are constructed, and how they resist being deteriorated by the oil.

Jim


mgb260
Jim Nichols
Sequim,WA
(2465 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Elephant foot/Mushroom lifters
Posted by: mgb260
Date: June 10, 2012 04:11PM

Jim, I think Fred mentioned having/using the composite lifters.
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roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Elephant foot/Mushroom lifters, Empi ?
Posted by: roverman
Date: June 10, 2012 07:09PM

I contacted 4 seconds flat. No elephant foot or mushroom lifters available. Composite material is actually ceramic.Thay do not mention friction reducers. I have Empi type 1 VW mushroom , tool steel with 1.220 big dia/.747" small, that pressure lube from lifter oil galley to push rod and .020" hole to lube the cam lobe.1.220" dia. will not clear companion lifters,(will need dia. reduction). Cheers, roverman.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Elephant foot/Mushroom lifters
Posted by: BlownMGB-V8
Date: June 10, 2012 07:22PM

Jim, I think you are right. I had forgotten. Any idea what thread that was? So ceramic eh? Seems reasonable.

Jim


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Elephant foot/Mushroom lifters, Di u colpi ?
Posted by: roverman
Date: June 10, 2012 07:39PM

I'm not Jim, but I do know the answer, "Cool case cam and lifters", May 16th. roverman.


Bill Young
Bill Young
Kansas City, MO
(1337 posts)

Registered:
10/23/2007 09:23AM

Main British Car:
'73 MG Midget V6 , '59 MGA I6 2.8 GM, 4.0 Jeep

authors avatar
Re: Elephant foot/Mushroom lifters
Posted by: Bill Young
Date: June 14, 2012 08:55AM

Art, my old Y block Ford 292 had mushroom style lifters. A couple of problems there, the "head" thickness will reduce the amount of cam lift according to the head thickness or the block will need to be machined from the underside to increase the depth of the lifter pocket. Second is that the lifter has to be able to be raised enough to clear the cam journals or you can't get the cam out. If you do use them then get yourself a set of old spring loaded wooden clothes pins, work great to hold the lifters up while you remove the cam.



roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Elephant foot/Mushroom lifters
Posted by: roverman
Date: June 14, 2012 10:47AM

For BOR engines, if you can get the cam "in" on 1-4 journals, lift will not be limited as the lobes "must" be shorter than the 1-4 journals. Got lifter bore centerline dimension ? This will determine maximum foot diameter. Cheers, Art.



Edited 1 time(s). Last edit at 06/14/2012 11:13AM by roverman.


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Elephant foot/Mushroom lifters, update, GT 2 and...
Posted by: roverman
Date: June 26, 2012 01:40PM

Seems "other" race santioning bodies, like VARA require flat tappet lifters, no rollers ! Rover and sbb should allow approx 1.19" mushroom dia., without hitting companion lifter. Who has mushroom cam data base ? Seems like a billet roller cam "might" work if ramps were'nt too steep, AND lobes were re-ground with .5 deg. angle on lobe to rotate lifter ? Anybody-Fred ? Cheers, roverman.


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