place your bets! alloy con rods

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turbocourier 79

trying to build it all
Apr 5, 2005
1,632
113
63
southern oregon
oooohh shit!

specs
7075 t7 material
about 137mm center to center (math and such)
22mm wrist pin
53mm crank
3.130" stroke v6
would really like to use bolt and nut opposed to capscrew.
i only rev her up now to about 5000 anyways but who knows with these!




my train of thought on this is that a 0.200" bridge in the piston will live decades and many 100K miles but a con rod is like 5K miles dead?!?!?!?
i drive the truck about 1000-1500 miles per year

 
Last edited:

smokeysevin

is Ron Burgundy?
Dec 28, 2012
304
49
28
Houston
Sweet project!

Are you going to use a bushing for the pin or use a coating like DLC on the pin? I looked into getting rods made cheaply a while back for a motor I was working on and found that you may be able to run without a bronze bushing in the pin hole at the top if you run a friction reducer like DLC coating on the piston pins.

I would upsize the connection at the piston since the bearing area of the con rod is like half that of the piston pin bore. Never having run an aluminum rod, I don't know where they typically fail but you can probably get away with just adding an extra failure factor on top of that area and send it.

Sean
 

turbocourier 79

trying to build it all
Apr 5, 2005
1,632
113
63
southern oregon
i plan on making them as fat as will fit!
the piston has no special coating in the pin bore
i figured i would just let hewr ride on the alloy

i googles aluminum connecting rod failure and can only find like top fuel motors esploding
so by my math, just dont make 8K horespower and spin 10K rpm. check!

end goal is like 450 horse at under 6000 rpm
20 pounds of boost
 
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smokeysevin

is Ron Burgundy?
Dec 28, 2012
304
49
28
Houston
Supposedly aluminum rods take to boost well since its "squishier" but don't like high piston acceleration or rpms but thats all I have ever read. Im tuned in either way.

Sean

Sent from my LM-G710 using Tapatalk
 

partybarge_pilot

Uno mas Cervesa!
May 14, 2004
10,049
773
113
Easton, KS
Grain direction is your biggest issue. Al the aluminum rods I have seen were forgings. Watch your deck height, they will stretch more.

Actually, all rods I have seen are forgings.
 

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