Automotive Connecting Rods 101
John Edwards discusses the various types of connecting rods found in modern engines. www.engine-machining.com (949) 631-6376
25 Comments so far
John Edwards discusses the various types of connecting rods found in modern engines. www.engine-machining.com (949) 631-6376
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What engine from chevrolet actually even runs past 7,000 rpm?
thank you for telling the diference
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lol whatever makes u sleep better at night fag.
Yes, and you still drive an overpriced slow econobox.
That was awesome! I love learning about engines!
I dont think they are forged but they are stronger than your average rod somehow
your stock itr rods are probably forged, right? i think these rpm is not as relevant personally, obviously the stroke makes the huge difference. like bikes that can go to 12k rpm probably have forged rods.
a real forged, you would think would be close to billet in the rpm range…
billet is always best IMHO because its a solid piece instead of 2 pieces put together or hot liquid metal pored into a mold. billet is always better.
Yup….
Shot peening and better rod bolts will increase fatigue limits as well.
Remember,.. the rod is stressed the most at “TDC” during the exhaust stroke. Its literally being stretched.
stroke has more to do with rpm tolerance than rod designbecause stroke determines the piston speed at TDC.
The connecting rod is under the most stress when the when the piston is halted at TDC after traveling to the top of the bore.
This sudden “halt” at TDC generates tremendous forces on the rod and the rod bolts.
Most well-built street performance engines will perform safely at 4000 ft/sec of piston speed.
Use this formula…
max rpm = (max piston speed X 6) / stroke
All those rods have such a low RPM tolerrance? I rev my Integra type R to 9500 on stock rods with no problems
Balancing is necessary, polishing doesn’t hurt either.
does polishing and ballancing forged rods help any. please advise
wrong. they are forged I beam rods
forged h
honda b series engines go 8000+. what rods do they use?
Sintered is crap. Forged much better.
one Billet Rod can take 1200hp???
Thanks John, good stuff!
Copper is superior as re. dissipation of heat and it is used on some rods for this reason.. These copper ’small ends’, in some applications, have been designed to operate without any bushing.
‘Rod ratio’ is very, very critical in determining torque to be available at a specific RPM range~ Are you conversant with the Hepworth-Granger formula?
(Worked for Freddie at one time)
Can you do Triumph 650 m.c. heads?
Nice work~ You are most generous in sharing your knowledge.
vary cool john
Very informative video, as always John.
Thanks.
Hi!
Im repairing a fiat 500 engine, im a little amateur on this things, can you tell me how much LBS do I have gine to the connecting rods.
thanks!