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  #21  
Old 01-18-2015, 07:57 PM
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Ross 4.375"
GRP 6.735"


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  #22  
Old 10-28-2017, 04:43 PM
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I'm sitting here thinking bout this new build and lightening it up from what i had, I'm surprised how light some of these are, compared to mine which i thought ran pretty damn good!
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74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #23  
Old 10-28-2017, 06:04 PM
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You're using a heavy rod and ring pack.

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  #24  
Old 10-28-2017, 06:30 PM
Steve C. Steve C. is offline
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Crower Lightweight 4.125 billet crank
Crower Midweight billet 6.8 rods
JE 4.310 pistons

2303.4
1/2 = 1151.7


.

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  #25  
Old 10-28-2017, 06:51 PM
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Quote:
Originally Posted by john marcella View Post
Do you mean 6.100 rod ?
If he were talking about a Carrillo 366 cid engine rod or 303 cid engine rod they would be 7.080" inches long John M.
He did not say 366 or 303 engine so assume your rod length question is valid (he had a typo error).

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  #26  
Old 10-28-2017, 07:05 PM
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Must be why my car is a turd, got heavy rods in, and a crank that weighs a ton

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  #27  
Old 10-28-2017, 07:07 PM
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Quote:
Originally Posted by PAUL K View Post
You're using a heavy rod and ring pack.
Yeap, Going to be changing that Paul!

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74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #28  
Old 10-28-2017, 07:33 PM
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Originally Posted by slowbird View Post
Must be why my car is a turd, got heavy rods in, and a crank that weighs a ton
Yea, turd , right lol

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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #29  
Old 10-28-2017, 07:36 PM
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2278.6.

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  #30  
Old 10-28-2017, 08:11 PM
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2278.6.
what's the combo?

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74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #31  
Old 10-28-2017, 08:23 PM
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455 + .030. Eagle rods, Sealed power forged pistons. factory crank. neutral balance

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  #32  
Old 10-28-2017, 08:33 PM
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Quote:
Originally Posted by slowbird View Post
Must be why my car is a turd, got heavy rods in, and a crank that weighs a ton
Says the fairweather racer.

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  #33  
Old 10-28-2017, 09:27 PM
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Originally Posted by grandville455 View Post
Yea, turd , right lol
My rods weigh around 850g, crank weighs a ton, don't worry to much about weight. Use the K.I.S.S method! Imo there is next to nothing in reducing crank, rod, piston weights as far as performance goes.

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  #34  
Old 10-29-2017, 08:16 AM
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Originally Posted by slowbird View Post
My rods weigh around 850g, crank weighs a ton, don't worry to much about weight. Use the K.I.S.S method! Imo there is next to nothing in reducing crank, rod, piston weights as far as performance goes.
Have u tried lighter stuff Brian? To me anything that helps lighten the assembly the easier to turn n less wear n stress?

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74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #35  
Old 10-29-2017, 08:55 AM
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Quote:
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To me anything that helps lighten the assembly the easier to turn n less wear n stress?
Generally that's how it starts out, the lighter the better. As you make more power you need heavier parts to stand up to the additional load. Next you have to pay the big bucks for stronger lighter parts, like ones made out of titanium.

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  #36  
Old 10-29-2017, 09:57 AM
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Originally Posted by grandville455 View Post
Have u tried lighter stuff Brian? To me anything that helps lighten the assembly the easier to turn n less wear n stress?
Ive had lighter rods and crank, no performance difference, in another engine we went from alum rods to steel, no performance difference. The lighter rotating assembly seem to rev quicker in neutral but that's it.

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  #37  
Old 10-29-2017, 10:00 AM
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Ive had lighter rods and crank, no performance difference, in another engine we went from alum rods to steel, no performance difference. The lighter rotating assembly seem to rev quicker in neutral but that's it.
When you switched to the aluminum rods and saw no difference, were the counterweights turned down or drilled?

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  #38  
Old 10-29-2017, 10:11 AM
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When you switched to the aluminum rods and saw no difference, were the counterweights turned down or drilled?
We've never had counter weights turned.
FWIW Chris U on yellowbullet has a 9000+rpm record setting bbc with 800+g rods

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  #39  
Old 10-29-2017, 01:02 PM
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We've never had counter weights turned.
FWIW Chris U on yellowbullet has a 9000+rpm record setting bbc with 800+g rods
When switching from a steel rod to aluminum rods you want to turn the counterweights down rather than drilling holes when balancing the crankshaft. Any gain you might of seen from the lighter rods may have been absorbed in windage losses due to the holes machined to balance the crank. You'll also benefit from the shorter counterweight.

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  #40  
Old 10-29-2017, 01:32 PM
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Originally Posted by PAUL K View Post
When switching from a steel rod to aluminum rods you want to turn the counterweights down rather than drilling holes when balancing the crankshaft. Any gain you might of seen from the lighter rods may have been absorbed in windage losses due to the holes machined to balance the crank. You'll also benefit from the shorter counterweight.
If that balance hole offsets the gains from the alum rods, then the gain was so small it wasnt going to be noticable.
Besides that how does lighter rods increase performance?

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