Realistically, on a Slant 6 lifter weight is meaningless.
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| Lifters https://slantsix.org/forum/viewtopic.php?t=34068 |
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| Author: | Bren67Cuda904 [ Mon Mar 02, 2009 11:55 am ] |
| Post subject: | Lifters |
I bought a cam from Reed and they didn't have any lifters available. I am looking for very good lifters. The local Napa has Sealed Power (AT2084) for $75ish. Ersons has some for $47 plus shipping which is about the same price in the end as Napa. I've heard Sealed Power is good, but I don't know and I don't know what type Ersons has (I always get voice mail). Are all lifters good or is some better than others. |
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| Author: | Joshie225 [ Mon Mar 02, 2009 12:00 pm ] |
| Post subject: | |
Just ask Reed for small block solid lifters. They weight a little more as they aren't the dumbbell style, but they are easy as pie to find. Do not buy Chinese lifters. |
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| Author: | dakight [ Mon Mar 02, 2009 12:24 pm ] |
| Post subject: | |
There was a full set of NOS lifters recently on Ebay... might still be there. |
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| Author: | Bren67Cuda904 [ Mon Mar 02, 2009 1:23 pm ] |
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Are Sealed Power Chinese? |
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| Author: | Bren67Cuda904 [ Mon Mar 02, 2009 7:52 pm ] |
| Post subject: | |
Isn't heavier lifters generally not as good as lighter ones? I mean if ya got a choice isn't lighter better than heavier? What are some of the Chinese brands that are out there? Maybe a better question is - What are some brands that are not Chinese crap. |
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| Author: | slantzilla [ Tue Mar 03, 2009 3:11 am ] |
| Post subject: | |
Realistically, on a Slant 6 lifter weight is meaningless.
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| Author: | mod5j [ Wed Mar 04, 2009 11:30 am ] |
| Post subject: | |
Slantzilla Realistically, on a Slant 6 lifter weight is meaningless.???? Interesting, maybe I can learn something. If this is true then push rod weight is also meaningless? In fact everything on the camshaft side of the fulcrum point of the rocker arm is in the same weight mass. The valve spring has to reposition that mass after each valve event. Are you saying that it is not significant because of the limited RPM capability of the SL6. Curious. Jim |
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| Author: | Shaker223 [ Wed Mar 04, 2009 1:11 pm ] |
| Post subject: | |
Quote: limited RPM capability of the SL6. Curious.
Yes, and the typical cams (lift & ramp speeds) are not that big compared to what the V8 guys are using.
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| Author: | slantzilla [ Wed Mar 04, 2009 3:15 pm ] |
| Post subject: | |
Quote: Quote: limited RPM capability of the SL6. Curious.
Yes, and the typical cams (lift & ramp speeds) are not that big compared to what the V8 guys are using.
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| Author: | mod5j [ Wed Mar 04, 2009 4:02 pm ] |
| Post subject: | Valvetrain Weight to Horsepower relationship |
Slantzilla HP = F x V ---------- Where; F = Force (lbs) and V = Velocity (ft/min) 33,OOO If Force is equal to the excess or unaddressed weight savings and 1 OZ. (28.35grams=1ounce) per cylinder (.0625 lb.) X 6 cyl. = .375 lb If the valve lift is .500 inch cam lift is.333inch; .333 inch and .333 inch returned to its seat. = .0555 ft. (2.857 w/neg exponent of -4) If Velocity = At 7000 RPM each cylinder has a valve event every 720 degrees of crankshaft rotation. 7000/2 = 3500 Camshaft RPM If the duration of the cam is 290 degree then the valve train is in motion 40.27% of the 3500 events per minute. (2.857 w/neg exponent of -4) And so Mr. Slantzilla you are correct, I worked this out and if one could trim 28.35 grams of weight per cylinder it would be worth about 3-4 HP. Not hugely significant. However there are other advantages to light weight valve train. Floating the valves is not related to HP it is the inability of the spring to return the valve train components to the rest position. Warning: I have been laid up with hand surgery for a few weeks, I can't go to the shop and work on my race car or motors. My wife will have a cow if I get this cast greasy. I've been to the end of the internet and will respond to anything. Jim |
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| Author: | mod5j [ Wed Mar 04, 2009 4:13 pm ] |
| Post subject: | Buy US Lifters |
Brennan http://www.slantsix.org/forum/viewtopic ... highlight= Jim |
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| Author: | Doctor Dodge [ Wed Mar 04, 2009 7:29 pm ] |
| Post subject: | |
Thanks for doing the math... I alway try to run the lightest valve train components and i also run real light valve spring pressures... and I always get a bunch of "flack" for doing so. Bottomline... if you can get the valve shut, at your max RPM, with a light spring pressure, anything more just eats HP, makes heat and wears-out parts. DD |
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| Author: | terrylittlejohn [ Wed Mar 04, 2009 8:07 pm ] |
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doug, that is the best way of putting it, giant pressure make for good bench racing. 
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