Conrod

All that has to do with the power train, gearbox, clutch, fuels and lubricants, etc. Generally the mechanical side of Formula One.
Tommy Cookers
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Joined: Fri Feb 17, 2012 3:55 pm

Re: Conrod

Post by Tommy Cookers » Sun Apr 01, 2018 4:49 pm

afaik
the tensile load will determine whether the small end eye can be designed for strength only ....
or whether stiffness (to avoid excessive contact loadings from pinch of the small end bearing) is the dominant design factor

Wright's Cyclone 18 c.1941 seems to have been a pioneer of H section rods
but maybe that was for the master rod only (and for master rod specific reasons)
or was it said that there some reason, from gas load distribution ?

strad
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Joined: Sat Jan 02, 2010 12:57 am

Re: Conrod

Post by strad » Sun Apr 01, 2018 6:55 pm

JEEEEEZ
Sorry guys I didn't look at the op date.
Never expected something like that to get bumped.
Motorsport without danger is like cooking without salt
Sir Stirling Moss

Big Tea
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Joined: Sun Dec 24, 2017 7:57 pm

Re: Conrod

Post by Big Tea » Sun Apr 01, 2018 8:38 pm

I wish there was a thread that us plebs could ask this sort of engineering question of the more knowledgeable.
One of the main reasons I joined up her is the depth and strength of expertises and the (seeming) willingness to share.

Looking things up is fine if you have the depth of understanding to first know the right questions and then how to apply it.

There are also thongs that are race car specific and the answer is out there for road cars, but not really applicable to F1. For instance, the effect of gearing on fuel consumption in f1. Plenty on road cars, but the requirements are not the same.
One test is worth a thousand expert opinions

Mudflap
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Re: Conrod

Post by Mudflap » Sun Apr 01, 2018 8:44 pm

Tommy Cookers wrote:
Sun Apr 01, 2018 4:49 pm
afaik
the tensile load will determine whether the small end eye can be designed for strength only ....
or whether stiffness (to avoid excessive contact loadings from pinch of the small end bearing) is the dominant design factor

Wright's Cyclone 18 c.1941 seems to have been a pioneer of H section rods
but maybe that was for the master rod only (and for master rod specific reasons)
or was it said that there some reason, from gas load distribution ?
I agree, rod stiffness is very important, not only for small end and big end bearings but for the rod bolts too (the higher the bolt turret stiffness, the smaller the bolt load). It is one of the many reasons titanium rods are so hard to design right as its young's modulus is half that of steel.

I suppose that in the case of radial engines having a H section master rod makes for a tidier transition to the flange that holds the other rods ?
How much TQ does it make though?

strad
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Joined: Sat Jan 02, 2010 12:57 am

Re: Conrod

Post by strad » Sun Apr 01, 2018 10:12 pm

Guess you could say I was conned. :roll:
Motorsport without danger is like cooking without salt
Sir Stirling Moss