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| Mushroom lifter cams https://www.slantsix.org/forum/viewtopic.php?t=39618 |
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| Author: | Charrlie_S [ Mon Mar 29, 2010 6:04 am ] |
| Post subject: | Mushroom lifter cams |
We have had several discussions, about roller cams on this site. But what about mushroom lifter cams? From what I understand, about roller cams, I really can't see them being worth over $1,000, except in a "all out, max effort" race car. I would think a mushroom lifter setup would cost, maybe $500 and be "more bang for the buck". I am pretty sure existing cams blanks/cores could be used. Any other thought on this? |
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| Author: | Mister Twister [ Mon Mar 29, 2010 6:27 am ] |
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Yes this is a neat idea. It would depend on how little or big the mushroom would grow. Do you have any idea of the lift or duration change with that style of lifters? Is this why your asking I would rather install lifters than change cam anytime. JMO |
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| Author: | Shaker223 [ Mon Mar 29, 2010 6:41 am ] |
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Quote: Yes this is a neat idea. It would depend on how little or big the mushroom would grow. Do you have any idea of the lift or duration change with that style of lifters? Is this why your asking I would rather install lifters than change cam anytime. JMO
You would still have to pull the cam with a mushroom cam/lifter set up. Mushroom lifters are typically installed with the cam out and the engine upside down.I just saw them for sale on another site for a Mopar. |
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| Author: | Charrlie_S [ Mon Mar 29, 2010 6:46 am ] |
| Post subject: | |
Quote: Yes this is a neat idea. It would depend on how little or big the mushroom would grow. Do you have any idea of the lift or duration change with that style of lifters? Is this why your asking I would rather install lifters than change cam anytime. JMO
Mushroom lifters, in themselves, don't change anything. They do, however, allow the use of a more agressive cam profile (if the base of the mushroom lifter is a larger dia then the stock lifter. They do require machining to the block, in most cases, so it is not a "drop in" deal. They also have to be installed from the bottom.These used to be used in a lot of race engines running in classes that did not allow roller cams. |
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| Author: | Charrlie_S [ Mon Mar 29, 2010 6:52 am ] |
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Quote: I just saw them for sale on another site for a Mopar. I had been thinking of adapting a Ford "flathead", "Y" block", or VW lifter. |
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| Author: | Mister Twister [ Mon Mar 29, 2010 8:17 am ] |
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Thanks Shaker I was looking up more info when you posted. Then phone rang. By the time I returned Charlie has also given more info on this. Ok so these are upside down mushrooms with a place in the stem for push rods. The reason for the upside down install and not just dropping them in. What kind of block work Charlie? For some reason I was seeing the push rod balancing on top of the mushroom as the motor was spinning  .
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| Author: | Shaker223 [ Mon Mar 29, 2010 8:47 am ] |
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Quote: Quote: I just saw them for sale on another site for a Mopar. I had been thinking of adapting a Ford "flathead", "Y" block", or VW lifter. I'll take a look.....problem is...I don't remember where!!! |
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| Author: | CNC-Dude [ Mon Mar 29, 2010 8:57 am ] |
| Post subject: | |
Quote: What kind of block work Charlie? The bottoms of the lifter bores have to be spot faced so that the OD of the mushroom(OD portion of lifter that touches the cam lobe) can recess into it for clearance between the block and lifter when the cam lobe is on its nose. There are pros and cons to this style of lifter, and has been said, the lifter itself doesn't make the cam open the valve more, it just changes the opening rates on the ramps because it has a bigger footprint on the cam lobe.
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| Author: | emsvitil [ Mon Mar 29, 2010 1:06 pm ] |
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Just getting a cam designed for the larger stock lifters would be of benefit instead of the lobes designed for the smaller chevy lifters....... |
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| Author: | emsvitil [ Mon Mar 29, 2010 1:08 pm ] |
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How much can you overbore the lifters? |
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| Author: | CNC-Dude [ Mon Mar 29, 2010 3:11 pm ] |
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Quote: How much can you overbore the lifters? Its been common for over 20 years to put a Ford lifter into a Chevy engine. The Chevy is an .842 diameter lifter, and the Ford is .875 diameter. That small of an increase is very benefical, it adds considerably the area under the curve. What size is the 225 lifter, there is a 1" diameter roller lifter available that many Top Fuel and Funny Car guys use in their Hemis, and it is almost a drop-in for the early GMC 6 cylinders.
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| Author: | Fopar [ Mon Mar 29, 2010 3:56 pm ] |
| Post subject: | |
Slant six lifter is .905" in diam. |
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| Author: | darrt wells [ Mon Mar 29, 2010 6:42 pm ] |
| Post subject: | |
Quote: Just getting a cam designed for the larger stock lifters would be of benefit instead of the lobes designed for the smaller chevy lifters.......
When I ordered my Erson cam, I asked John Hartman if the lobes were ground for a .904 dodge lifer. He told me yes...?
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| Author: | Shaker223 [ Wed Apr 07, 2010 9:54 am ] |
| Post subject: | |
Charrlie S, This is the site I saw for mushroom lifters. http://www.4secondsflat.com/SM%20Tool%2 ... ifters.htm |
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| Author: | slantzilla [ Wed Apr 07, 2010 4:56 pm ] |
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The big question is what would you gain when you have a head that dies at .600" lift anyway? In all honesty, I saw a damn fast all motor car at MATS that is running way less camshaft than what I run in my junk. 
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