Re: big block rods
[Re: Wedgeman]
#2456972
02/24/18 10:26 PM
02/24/18 10:26 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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I went 9.80’s @ 2800 pounds over 25 years ago but I throw them on a he scrap pile now and buy better rods. I did change out the rod bolts for Dirrect Connection ones and did some grinding on the beams.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: big block rods
[Re: Wedgeman]
#2456978
02/24/18 10:31 PM
02/24/18 10:31 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Rating connecting rods by HP and torque is completely a marketing trick. What breaks rods is reciprocating weight times RPM as the piston passes through TDC on the intake stroke, and it would happen with the ignition off.
Boffin Emeritus
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Re: big block rods
[Re: polyspheric]
#2456986
02/24/18 10:45 PM
02/24/18 10:45 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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I’ll add that my engine had a stock crank and very heavy TRW pistons. We didn’t have many choices back then.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: big block rods
[Re: polyspheric]
#2456992
02/24/18 10:52 PM
02/24/18 10:52 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Rating connecting rods by HP and torque is completely a marketing trick. What breaks rods is reciprocating weight times RPM as the piston passes through TDC on the intake stroke, and it would happen with the ignition off. The stock rods are pretty good around 5800, past 6200 rpm things get worse. If you plan on higher rpms then that on a regular basis, after market rods for sure. Sure they can be zinged up to 7200, 8000 rpm and survive, like in the water box by accident. But you surely don't want to race them at those rpms
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Re: big block rods
[Re: Sport440]
#2456998
02/24/18 11:00 PM
02/24/18 11:00 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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4.56 gears, 14-31 slick. Never broke a rod but after 3 years of racing twice a weekend every crank I had magnafluxed during rebuild had cracks
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: big block rods
[Re: Wedgeman]
#2457014
02/24/18 11:20 PM
02/24/18 11:20 PM
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Joined: Sep 2015
Posts: 1,096 Australia
ozymaxwedge
super stock
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super stock
Joined: Sep 2015
Posts: 1,096
Australia
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I have an old 440 that was my first race motor in my 63 Plymouth, it is a cast crank LY rod engine with TRW's, belted the living daylights out of it running a best of 9.69 @ 135 with a small shot of gas. It has had a sleeve fitted to one cylinder after a pin walked but this engine still lives and is a 10.90 deal in my sons street valiant. Cast Crank LY rod action https://www.youtube.com/watch?v=nt4DpdAI7Fk
1963 Plymouth Max Wedge 1971 Barracuda
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Re: big block rods
[Re: Wedgeman]
#2457307
02/25/18 02:27 PM
02/25/18 02:27 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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'69 Cuda, 3000lbs 14x32, 4.88's, Stock blueprinted 440 6-pack motor, polished beams/shot peened good bolts on rods, turned 6600 NA, 7000 w/125hp N20, 7300 w/150hp N20 to run 9.96. No issues, had external oiling, but wouldn't hit that 7300 run more than once, didn't like the song the motor sang at those rpms.
Last edited by rb446; 02/25/18 02:32 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: big block rods
[Re: Wedgeman]
#2457430
02/25/18 06:53 PM
02/25/18 06:53 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Steel rods can be tortured many times, and come back to fight another day. An aluminum rod, once stretched, is a ticking bomb.
Boffin Emeritus
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Re: big block rods
[Re: Wedgeman]
#2458621
02/27/18 11:22 PM
02/27/18 11:22 PM
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Joined: Sep 2015
Posts: 1,096 Australia
ozymaxwedge
super stock
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super stock
Joined: Sep 2015
Posts: 1,096
Australia
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Woww! They are that strong ? So they should live long in a 650hp motor ?
440 source sells a set for 250$......hummmm what to do ?
Dan But are the Source rods as good as the old LY's ?? Not sure.
1963 Plymouth Max Wedge 1971 Barracuda
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Re: big block rods
[Re: ozymaxwedge]
#2458633
02/27/18 11:49 PM
02/27/18 11:49 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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If it was me I would spend a few extra bucks and see if Scat offers a big block rod. I had a set of Scat small block rods I bought in a package deal and they looked real nice. Very reasonable too. At least they come with 7/16 rod bolts. it cost a fair amount of money just to prep the old stock rods.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: big block rods
[Re: Wedgeman]
#2458646
02/28/18 12:21 AM
02/28/18 12:21 AM
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Joined: May 2003
Posts: 6,562 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,562
Downtown Roebuck Ont
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Woww! They are that strong ? So they should live long in a 650hp motor ?
440 source sells a set for 250$......hummmm what to do ?
Dan In case you missed Polyspheric's earlier post above. Rating connecting rods by HP and torque is completely a marketing trick. What breaks rods is reciprocating weight times RPM as the piston passes through TDC on the intake stroke, and it would happen with the ignition off. Kevin
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Re: big block rods
[Re: Twostick]
#2458655
02/28/18 12:34 AM
02/28/18 12:34 AM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Woww! They are that strong ? So they should live long in a 650hp motor ?
440 source sells a set for 250$......hummmm what to do ?
Dan In case you missed Polyspheric's earlier post above. Rating connecting rods by HP and torque is completely a marketing trick. What breaks rods is reciprocating weight times RPM as the piston passes through TDC on the intake stroke, and it would happen with the ignition off. Kevin Also, what Poly left out, was duty cycles, miles/rpm over the rods lifetime. That's most likely a unknown. Are they at the end of their life cycle or somewhere in between.
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