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| Tried the 84g Mech Lifters from Comp #89904? https://www.slantsix.org/forum/viewtopic.php?t=61208 |
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| Author: | csheehy [ Thu Jun 01, 2017 9:01 am ] |
| Post subject: | Tried the 84g Mech Lifters from Comp #89904? |
Is anyone using the Tool Steel Solid/Mechanical Lifters #89904-16 from Comp? https://goo.gl/0Nojat At 84g each, they offer a considerable advantage in lightening the valvetrain mass. This is the lightest solid lifter I've seen for the /6 for street use - does anyone know of any that are lighter? |
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| Author: | Dart270 [ Thu Jun 01, 2017 11:21 am ] |
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What does a stock dumbbell lifter weigh? Personally, I would spend $550 elsewhere given other ripe targets like head porting and heavy rods/pistons... Lou |
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| Author: | Reed [ Thu Jun 01, 2017 11:56 am ] |
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Quote: What does a stock dumbbell lifter weigh? Personally, I would spend $550 elsewhere given other ripe targets like head porting and heavy rods/pistons...
+1.
Lou |
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| Author: | SlantSixDan [ Thu Jun 01, 2017 12:34 pm ] |
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+2 (that's +1 for what Lou said, and another +1 for avoiding Comp's stuff on general principle.) |
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| Author: | coconuteater64 [ Thu Jun 01, 2017 12:36 pm ] |
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Quote: +2 (that's +1 for what Lou said, and another +1 for avoiding Comp's stuff on general principle.)
+3, for what Lou and Dan said.
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| Author: | Dart270 [ Thu Jun 01, 2017 12:58 pm ] |
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Also, even pretty radical 225s really only make good power up to about 6000 RPM, which is not super high relative to SB V8s using the same lifters. Lou |
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| Author: | emsvitil [ Thu Jun 01, 2017 1:43 pm ] |
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Quote: What does a stock dumbbell lifter weigh? Personally, I would spend $550 elsewhere given other ripe targets like head porting and heavy rods/pistons...
Happened to have one laying around.Lou Stock type Sealed power dumbbell 98.7 grams |
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| Author: | SlantSteve [ Thu Jun 01, 2017 1:55 pm ] |
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Weight on the lifter side of the valvetrain is not as critical as the valve/spring/retainer side. Saying that,by the time a slant reaches a point where you need to consider valve train weight you will likely need a bucket and broom to pick up the rest of the engine. If you want to explore gains beyond the usual but very beneficial head,cam ,carb type mods then put the money towards a better piston/ring/rod package. |
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| Author: | Old6rodder [ Thu Jun 01, 2017 10:20 pm ] |
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If my fingers are correct it makes me +6. I'm running a stock bore & stroke 225 with dumbbells, slightly lightened stock rockers, single stock springs & the contoured stock spring caps on stock valves at .450 lift through home porting in my street Toad this time around. She sees 5000+ more often than I should, and has for six years now. I'd spend 5 bills (if I had it left  ) elsewhere.
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| Author: | Dart270 [ Fri Jun 02, 2017 4:12 am ] |
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Thanks for the number, Ed, and for the perspectives, everyone... Lou |
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| Author: | csheehy [ Fri Jun 02, 2017 7:07 am ] |
| Post subject: | Thanks for the input |
Thanks for all the input - and for keeping counts of them, but for an overall valvetrain weight savings of 1/2 lb, I absolutely think it's a worthy investment. In of itself, a lightweight lifter (or spring, retainer, adjustment screw, pushrod ) won't make much of a difference - but the cumulative effect of lightening these components is a benefit that can be observed. I'm new to the /6 thing, but the lightening reciprocating mass as a beneficial performance and longevity tactic has been used with v8 engines forever. I'd assume with all engines... What makes the /6 so different that this modification is receiving so much disapproval? I'm not challenging - just inquisitive. Some of the brightest folks on the forum have responded negatively - why so? Sure head work and a multitude of other performance tricks are higher on the bang-for-the-buck list, but if you had to only replace a lifter - wouldn't the knowledge that a lighter one is better than a heavier one be beneficial? I'm hoping to learn something - looking forward to a deeper dive discussion. Thanks again everyone! -Chris |
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| Author: | Reed [ Fri Jun 02, 2017 7:15 am ] |
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Because on a slant six there are bigger issues to tackle before you start doing exotic things like running lightweight lifters. Such as improving the flow through the head and exhaust. If you have already upgraded the port and valve size and installed bigger exhaust and induction, then, maybe, if you have $500 burning a hole in your pocket, go ahead and install lightweight lifters. Slant sixes have had no longevity problems for decades running stock lifters. |
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| Author: | csheehy [ Fri Jun 02, 2017 7:31 am ] |
| Post subject: | RE: Reed |
I get all that Reed - the question was specifically focused on the lifters. I understand and have commented that this is low on the ROI need-to-do-firs list. Valve-side weight is more impactful - I was hoping to have a focused dialog; on lifter weight. I respect your contributions on the forum, thanks for your input here. -Chris |
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| Author: | Dart270 [ Fri Jun 02, 2017 8:20 am ] |
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15 g per lifter is tiny compared to other moving things. When folks use roller rockers, they probably add more than that per rocker since the stockers are so light. Thick pushrods (required for high lift cam and high spring pressures - yes I have destroyed stockers) also add 10+g each. 7mm or 5/16" stem valves would save you about this much, or maybe more. Using beehive springs vs. regular/double springs would also likely save you more than 15 g each and be less expensive. Lou |
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| Author: | slantzilla [ Fri Jun 02, 2017 9:16 am ] |
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Normally, the idea to using a lighter lifter is to get away with less valvespring in a higher RPM application. High RPM on most Slants is 6000 or less. The benefit from using light lifters would be very hard to measure. Slant guys are very "frugal" to start with. You really need to post good evidence that a $500 part makes a difference before anyone will get on board.
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