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Rotating Assembly Weight Reduction #626807
02/28/10 12:53 PM
02/28/10 12:53 PM
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Mooresburg, Tn
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'72CudaRacer Offline OP
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I balanced my rotating assembly yesterday, and if my math is correct, I lost almost 4 3/4 lbs. New pistons, pins, rings, retainers = 888 grams, old = 1113 grams (old DC/TRW pistons) New H-beam rods were only 8 grams lighter than stock LY rods, but are bushed and have ARP 2000 7/16" cap screws and should be MUCH stronger. Plus King Pro rod bearings are 4g less than Clevitte 77.
That comes to 237g/ hole X 8 = 1896g, plus the 240g removed from crank shaft = 2136g total weight removed from rotating assembly. (1g = 28.349 oz.) 3126g = 75.34 oz = 4.7 lbs
Anyone know what the engine will "see" because of this?
And then we add approx. 3.5 more points of compression (from 10.0:1 to 13.5:1) and a set of alum Stealth heads, we can do more of this

Brian

5835636-drags5-30025w.jpg (117 downloads)
Re: Rotating Assembly Weight Reduction [Re: '72CudaRacer] #626808
02/28/10 12:58 PM
02/28/10 12:58 PM
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Oregon
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AndyF Offline
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Sounds about right. Less weight on the nose of the car, less weight to rotate and less weight that has to be stopped and started every spin of the crankshaft.

Re: Rotating Assembly Weight Reduction [Re: AndyF] #626809
02/28/10 01:00 PM
02/28/10 01:00 PM
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United Socialist States of Ame...
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tboomer Offline
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Interesting,Brian...What did the ly rod weigh...


The end is near.....
Re: Rotating Assembly Weight Reduction [Re: AndyF] #626810
02/28/10 01:03 PM
02/28/10 01:03 PM
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Ron Silva Offline
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You did good! I have always been a big believer in weight reduction.

Here is 10 pounds of dead weight, GONE!

5835659-MVC-028F.JPG (244 downloads)

SRT DEMON ONE SEAT
Re: Rotating Assembly Weight Reduction [Re: '72CudaRacer] #626811
02/28/10 01:07 PM
02/28/10 01:07 PM
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL Offline
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Sounds like we're in the same boat. I dropped 7.7+ lbs off my rotating assy, upped the CR from 8.6-1 to 12-1, and opened the heads up a lot and now have no clue what's in store

Re: Rotating Assembly Weight Reduction [Re: Ron Silva] #626812
02/28/10 01:11 PM
02/28/10 01:11 PM
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Akron, Ohio U.S.A.
roadhazard Offline
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Quote:

You did good! I have always been a big believer in weight reduction.

Here is 10 pounds of dead weight, GONE!







I lost 415 grams off my valve train last year!

EDIT:My calc says 3126g = 110.2664oz = 6.8915#
All I can say is Hold On and Sinch Your Belts Tighter

Last edited by roadhazard; 02/28/10 01:16 PM.
Re: Rotating Assembly Weight Reduction [Re: '72CudaRacer] #626813
02/28/10 01:20 PM
02/28/10 01:20 PM
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Canton, Ohio
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Sport440 Offline
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Herb Adams had a comparison chart on rotatating vs static weight. On a rotating assembly each 1# loss was worth 2 HP.

So if you were to accept that as Fact, then a 4.7# loss = 9.4 HP

Whether its true or not. No doubt a 4.7# loss off the rotating assembly is a win, win deal. mike

Re: Rotating Assembly Weight Reduction [Re: tboomer] #626814
02/28/10 01:39 PM
02/28/10 01:39 PM
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Mooresburg, Tn
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Quote:

Interesting,Brian...What did the ly rod weigh...




Stock LY rod, with a 1/8" hole in the top of the pin end, pin end floated (not bushed), ARP bolts (stock style), nuts, & no bearings = 860g
The big ends were not resized if I remember correctly. I measured them and found them to be acceptable.

Re: Rotating Assembly Weight Reduction [Re: Ron Silva] #626815
02/28/10 01:42 PM
02/28/10 01:42 PM
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Mooresburg, Tn
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Quote:

You did good! I have always been a big believer in weight reduction.

Here is 10 pounds of dead weight, GONE!




Did you rifle drill the crank???
That shouldn't affect the balance, because it's on the center line of the rotating mass, just lower total weight, correct?

Re: Rotating Assembly Weight Reduction [Re: '72CudaRacer] #626816
02/28/10 01:45 PM
02/28/10 01:45 PM
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Thanks,Brian!


The end is near.....
Re: Rotating Assembly Weight Reduction [Re: roadhazard] #626817
02/28/10 01:46 PM
02/28/10 01:46 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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EDIT:My calc says 3126g = 110.2664oz = 6.8915#
All I can say is Hold On and Sinch Your Belts Tighter




I have 1g = .0352 oz, 1 oz = 28.349g. Or is that not correct?

Re: Rotating Assembly Weight Reduction [Re: '72CudaRacer] #626818
02/28/10 02:15 PM
02/28/10 02:15 PM
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Canton, Ohio
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Sport440 Offline
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Quote:

EDIT:My calc says 3126g = 110.2664oz = 6.8915#
All I can say is Hold On and Sinch Your Belts Tighter




I have 1g = .0352 oz, 1 oz = 28.349g. Or is that not correct?





Maybe its not exact but roughly 454 grams = 1#

454/16 oz. = 28.375 grams a oz. So you are correct.

That 110.266 grams per oz. is a mistake. His total grams converted to pounds is correct. mike

3126/454= 6.8854 pounds.

Re: Rotating Assembly Weight Reduction [Re: Sport440] #626819
02/28/10 03:30 PM
02/28/10 03:30 PM
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michigan
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sturmenater Offline
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michigan
It will most defently help your engine live longer not spining all that extra weight

Re: Rotating Assembly Weight Reduction [Re: sturmenater] #626820
02/28/10 03:54 PM
02/28/10 03:54 PM
Joined: Jan 2003
Posts: 1,235
TN
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65racer Offline
2009 IHRA World Champion
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TN
Brian, how's it going?
Seems like your gonna step it
up quite a bit.
Get it ready, racing season is
just around the corner.

Maybe I should have made mine
quicker, but didn't want to
mess with my combo.

Good luck
Dave

ps,,,,, If anyone around your neck of the
woods is looking for a new enclosed
trailer, send them my way, I have that
28' I need to get rid of.

Last edited by 65racer; 02/28/10 04:26 PM.
Re: Rotating Assembly Weight Reduction [Re: 65racer] #626821
02/28/10 04:43 PM
02/28/10 04:43 PM
Joined: Aug 2009
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Mooresburg, Tn
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Davey, I sent you a PM.
Brian

Re: Rotating Assembly Weight Reduction [Re: Sport440] #626822
02/28/10 06:19 PM
02/28/10 06:19 PM
Joined: Apr 2006
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Akron, Ohio U.S.A.
roadhazard Offline
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Quote:

Quote:

EDIT:My calc says 3126g = 110.2664oz = 6.8915#
All I can say is Hold On and Sinch Your Belts Tighter




I have 1g = .0352 oz, 1 oz = 28.349g. Or is that not correct?





Maybe its not exact but roughly 454 grams = 1#

454/16 oz. = 28.375 grams a oz. So you are correct.

That 110.266 grams per oz. is a mistake. His total grams converted to pounds is correct. mike

3126/454= 6.8854 pounds.




So he took off 6.88# not 4.7# correct?
I was using a converter that I found online and yes I made a mistake 1g = .03527396oz
Hope I didn't cause any problems

Re: Rotating Assembly Weight Reduction [Re: roadhazard] #626823
02/28/10 07:03 PM
02/28/10 07:03 PM
Joined: Aug 2009
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Mooresburg, Tn
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Hey Greg,
4.75 or 6.8, it's still a LOT. Biggest thing by far was the pistons. These are domes, flat tops would be even more. I have a JE flat top here that weighed 58g per hole less than my Ross'.
Brian

Re: Rotating Assembly Weight Reduction [Re: roadhazard] #626824
02/28/10 07:51 PM
02/28/10 07:51 PM
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Canton, Ohio
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Sport440 Offline
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Hey Greg I see what happend with the 4.77# vs the 6.88#

Brian had both sets of numbers listed in grams 3126 - 2136 and typoed a 3 and 2 switch. You did the math for the 3126, Brian did the math for 2136. After rereading the post the 2136 gram number is the correct one. So 4.7# is the number.

6.8 - 4.7 its all in the right direction. mike

Re: Rotating Assembly Weight Reduction [Re: Sport440] #626825
02/28/10 11:25 PM
02/28/10 11:25 PM
Joined: Aug 2009
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Mooresburg, Tn
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Quote:

Hey Greg I see what happend with the 4.77# vs the 6.88#

Brian had both sets of numbers listed in grams 3126 - 2136 and typoed a 3 and 2 switch. You did the math for the 3126, Brian did the math for 2136. After rereading the post the 2136 gram number is the correct one. So 4.7# is the number.

6.8 - 4.7 its all in the right direction.
mike




I think I need to take a break. Yesterday at the machine shop, Dan is letting me do as much as I can. (I'm a mechanic, not a machinist) Anyway, I'm weighing everything and balancing rods & pistons and filling out balancing work sheet. I get done and he comes over to set up balancer, and finds that I've recorded small end at 255g and big end at 297g (597g was correct) for a rod total of 552g, 300g light. Good thing he don't trust me yet!
Sorry about that.
Brian

Re: Rotating Assembly Weight Reduction [Re: '72CudaRacer] #626826
02/28/10 11:30 PM
02/28/10 11:30 PM
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL Offline
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Maybe that's why Scott and Dale did all my balancing on a day I wasn't there to help

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