|
|
|
|
04-13-2023, 09:39 AM
|
#1 |
|
VIP Member
Join Date: Dec 2007
Location: Woodlawn IL
Posts: 1,092
Likes: 162
Liked 216 Times in 77 Posts
|
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.
|
|
|
|
04-13-2023, 10:21 AM
|
#2 |
|
Senior Member
Join Date: Dec 2001
Location: Elysburg, Pa
Posts: 733
Likes: 360
Liked 327 Times in 121 Posts
|
Re: Min assembly weight effect on ET
Zero.
|
|
|
| Liked |
|
04-13-2023, 10:54 AM
|
#3 |
|
Senior Member
Join Date: Apr 2020
Location: Phila, PA
Posts: 794
Likes: 0
Liked 734 Times in 385 Posts
|
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. Stan |
|
|
|
| Liked |
|
04-13-2023, 11:10 AM
|
#4 |
|
VIP Member
Join Date: Feb 2014
Location: Derby City, USA
Posts: 3,640
Likes: 1,083
Liked 7,941 Times in 1,520 Posts
|
Re: Min assembly weight effect on ET
It sure won’t hurt …l
|
|
|
|
| Liked |
|
04-13-2023, 11:19 AM
|
#5 | |
|
Senior Member
Join Date: Apr 2020
Location: Phila, PA
Posts: 794
Likes: 0
Liked 734 Times in 385 Posts
|
Re: Min assembly weight effect on ET
Quote:
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 |
|
|
|
|
| Liked |
|
04-13-2023, 11:50 AM
|
#6 |
|
VIP Member
Join Date: Feb 2014
Location: Derby City, USA
Posts: 3,640
Likes: 1,083
Liked 7,941 Times in 1,520 Posts
|
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…
|
|
|
|
| Liked |
|
04-13-2023, 11:56 AM
|
#7 | |
|
VIP Member
Join Date: Dec 2007
Location: Woodlawn IL
Posts: 1,092
Likes: 162
Liked 216 Times in 77 Posts
|
Re: Min assembly weight effect on ET
Quote:
|
|
|
|
|
|
04-14-2023, 11:22 AM
|
#8 |
|
VIP Member
Join Date: Dec 2001
Location: Texarkana Ark/TX
Posts: 2,446
Likes: 575
Liked 880 Times in 311 Posts
|
Re: Min assembly weight effect on ET
Depends
Rotating weight IE: crankshaft Counter weight and rod big end act like flywheel weight. Reciprocating IE: upper rod, piston and pin and rings are a start & stop motion and absorb energy in the start and stop. 100 G off each upper reciprocating only lightens the crankshaft counter weights 100 G. 100 G. off the big end of each rod lightens each rod journal 200 G. (2 rods per journal) The end crankshaft counter weight is lightened a corresponding amount. The total effective loss of rotating is 400 G.
__________________
Adger Smith (Former SS) Last edited by Adger Smith; 04-14-2023 at 11:24 AM. Reason: sp |
|
|
|
| Liked |
|
04-14-2023, 07:21 PM
|
#9 |
|
Senior Member
Join Date: Oct 2003
Location: Lower Slower Delaware
Posts: 535
Likes: 22
Liked 269 Times in 99 Posts
|
Re: Min assembly weight effect on ET
The thought was that reducing weight close to the center of rotation does not produce gains as would further out from center.
When thinking about flywheel weigh with large and small diameter which has more effect? On old machines have seen had large flywheels which stored energy better than smaller diameter. Those things driven by leather belts were effing dangerous started slow and slow to stop.
__________________
Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given" |
|
|
|
 |
| Thread Tools | |
| Display Modes | |
|
|
Hybrid Mode
