'How much power can my connecting rods handle?' - Everyone.

Simple Question, Difficult Answer | Connecting Rods 101 [#TECHTALK]

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In this [TECH TALK] we're going to dive into some of the reasons why working out how much power a con rod can handle is a difficult question to answer with even some manufactures supplying ambiguous figures with their aftermarket con rods.

Topics covered include why horsepower figures are actually less important than cylinder pressure when it comes to rod selection, materials used in OEM and aftermarket con rods, manufacturing techniques and their disadvantages, what abuse your con rod actually goes through and how this relates to why it is difficult to answer what seems like a simple question and much more.

0:00 - The Obvious Question
0:55 - OEM Manufacturing Techniques
3:37 - Aftermarket Comparison
6:17 - Con Rod Stresses And Strains
8:45 - Why Horsepower Is Irrelevant
8:57 - Tensile Strength
10:42 - RPM Increases
11:15 - Specific Power Recommendations
13:14 - Quick Visual Comparison
14:42 - Rod Bolts
16:18 - Rotating Vs Reciprocating Mass And Balancing
20:01 - Takeaway
20:54 - Learn More

#highperformanceacademy #conrods #connectingrods #learntotune #enginebalancing #condrodbalacing #enginebuilding101 #enginebuilding #motorsport #build

[stooartbabay]

Got woken up this morning to a TNT guy delivering my new rods... goto kitchen, makes coffee, opens YouTube and finds this video. Thanks HPA and team for being psychic!! :)

[elitegunslinger]

Next time I'm in New Zealand I need to stop by HPA, you guys are awesome.

[satanaz]

Another thing that people usually overlook is the fatigue strength of a given metal used for building the rod.
Steel has a very high fatigue strength, while Aluminum and even Titanium alloys not so much. So, even though some alloys might be suitable for high horsepower applications, they will most probably never match the long term reliability of a steel alloy.

[marklowe]

The one thing to learn about engine builds is how very subjective and dependant selection of parts is.

[noprob]

High quality content as usual. Keep up the excellent work

[Spudstrodamus]

Always the best information about anything engine related

[VideoDetection]

Very informative video! Pity there was no mention of billet steel vs forged rods and their pros and cons.

[PeakPerformanceReviews]

I only thought the L19 bolts suffered from the problems with acids from your skin etc? Interesting. Great vid as always guys 😎👍

[samchristian]

Great video as always!
Quick general question, if you take an engine and change nothing else except increase power by adding boost (not increasing the RPM) would the cap bolts be under any additional stress, since the stress is really only on the exhaust stroke?

[leenux]

as always, a lot of good info here !
the weight of the rod is also import, for high RPM NA engine, it's better to have a lighter rod than a low RPM high torque turbo engine (obvious for some people ... but bigger isn't always better) weight eat power at high RPM

[peterfuchs]

Andre you forgot to mention conrod length and piston compression height. Cheers

[Hanibul_Lecktor]

Me after watching forged in fire for several years: So you're telling me Damascus forged rods are possible ?

Carrillo: Sir this isn't how this works exactly.

Also me: So you're saying it's not impossible, just not available yet ?

[robertfontaine]

Most rod issues I have seen relate to overheating or trying to run the engine without oil. Connecting rods don't appear to be the weakest link in just about any build. I strongly suspect that unless you are doing 1000hp 1/8 mile drag racing that after market rods are usually snake oil.

[greggreg]

I just received my new rods..settled on PPM rods over the boostline with 625 bolts.

I had to go through all that... very frustrating trying to calculate cylinder pressure vs piston size ect.
I just ended up getting the strongest rods I could find??

[cuthberter]

Is it possible to over-specify a rod? I guess the stronger rods are heavier, but for example the bolts. Putting weight and cost aside are there any downsides liking lifing/fatigue?

[TheMatrixcube]

Great video ....

One tought tho ... When you speak about the special material rodbolts ... So you cant touch them with your bare hands because of the natural oils on our skin tho them being in engineoil all the time isnt any issue ?

Thanx again for the knowledge !

Cant ever learn to much about your passion 💪

[jmc]

Any thoughts on carbon fiber connecting rods?

[mxguy]

This is not a hard question at all, it's just not about power . The material strength/design has a compressive and tensile strength... I’m talking force. So you're right, it's not about power, it is however very closely related to both rpm and cylinder pressure. Cylinder pressure is fairly closely related to torque. It is entirely possible to give both an RPM and extrapolate a torque limit for a connecting rod with the only real variables being if the engine is supercharged or not. It would be simple to create a table for a motor with rpm limits based on stroke and piston weight and rpm. The same could be done with torque limits but it would be based on induction type.

[FoxxSacha]

How close should the connecting rod weights be within each other? What is an acceptable tolerance. E.g. all to be within 0.1 gram of each other at the big end and little end.

[speedfreak]

Great vid. Dont mean to be an ass know it all but Pretty sure custom age 625+ is impervious to hydrogen embrittlement. Its L19 that is prone to corrosion and hydrogen embrittlement.