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Old 04-13-2023, 09:39 AM   #1
Rob Petrie E395
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Default Min assembly weight effect on ET

If you were able to lose 100 grams off your rod/piston weight. How much ET difference would you see? I’ve looked all over trying to find an answer with no luck.
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Old 04-13-2023, 10:21 AM   #2
Paul Precht
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Default Re: Min assembly weight effect on ET

Zero.
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Old 04-13-2023, 10:54 AM   #3
Stan Weiss
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Default Re: Min assembly weight effect on ET

100 grams * 8 = 800 grams / 1.7637 lbs

Let say that weight is at a 4" radius with an acceleration rate of 2500 RPS.

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Old 04-13-2023, 11:10 AM   #4
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Default Re: Min assembly weight effect on ET

It sure won’t hurt …l
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Old 04-13-2023, 11:19 AM   #5
Stan Weiss
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Default Re: Min assembly weight effect on ET

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It sure won’t hurt …l

That depends on where and how much weight was removed. Is the part now no longer as strong as it needs to be, and it is flexing which will cost you more HP than the weight saving gave you?

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Old 04-13-2023, 11:50 AM   #6
MR DERBY CITY
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Default Re: Min assembly weight effect on ET

I have to disagree Stan. I believe the OP is referring to his LT 1 stocker and he is blueprinting the piston/rod combo to achieve the minimum weight spec set by NHRA. I dont believe he is in any danger of weakening or flexing any stocker parts…
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Old 04-13-2023, 11:56 AM   #7
Rob Petrie E395
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Default Re: Min assembly weight effect on ET

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That depends on where and how much weight was removed. Is the part now no longer as strong as it needs to be, and it is flexing which will cost you more HP than the weight saving gave you?

Stan
The bulk of the weight reduction would come from a lighter rod. Production GM rod that has had small end bushed and ARP rod bolts installed vs significantly lighter Manley Rod thats on the approved list.
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Old 04-13-2023, 12:10 PM   #8
Stan Weiss
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Default Re: Min assembly weight effect on ET

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Originally Posted by Rob Petrie E395 View Post
The bulk of the weight reduction would come from a lighter rod. Production GM rod that has had small end bushed and ARP rod bolts installed vs significantly lighter Manley Rod thats on the approved list.

Then you should be fine. I took it as you were going to lighten the parts you had.


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Old 04-13-2023, 03:28 PM   #9
GTX JOHN
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Default Re: Min assembly weight effect on ET

On our small block Mopars less than a hundred.
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Old 04-13-2023, 03:52 PM   #10
Jeff Stout
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Default Re: Min assembly weight effect on ET

I was hoping for a better outcome. Im about 120 grams per assembly heavy. Thats basically running a ninth piston assembly
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