[Fot] FW: Racing rod design

[Marcel Van Mulders]

-----Oorspronkelijk bericht-----
Van: Marcel Van Mulders [mailto:van.mulders.marcel at telenet.be] 
Verzonden: woensdag 22 juli 2015 19:29
Aan: 'MadMarx'
Onderwerp: RE: [Fot] Racing rod design

Hi Chris and Bob,
As you know, I bought Bob's TR4A and I did have a look at the rods : Pauter
may call these rods X-beam but they actually are H-beam rods, much the same
design as the H-beam rods of Carrillo. (b.t.w. Carrillo's I beam rods are
less expensive than their H-beam one's). 
Marcel 

-----Oorspronkelijk bericht-----
Van: Fot [mailto:fot-bounces at autox.team.net] Namens MadMarx
Verzonden: dinsdag 21 juli 2015 21:39
Aan: 'FOT'
Onderwerp: Re: [Fot] Racing rod design

Hi Bob,

from engineer basis x-beam are the worst you can get. I'll never get a clue
how someone could imagine this design.

Cheers
Chris

-----Ursprüngliche Nachricht-----
Von: rkramer3 at austin.rr.com [mailto:rkramer3 at austin.rr.com]
Gesendet: Dienstag, 21. Juli 2015 21:31
An: 'FOT'; MadMarx
Betreff: Re: [Fot] Racing rod design


Chris,http://webmail.roadrunner.com/do/mail/message/reply?msgId=INBOXDELIM68
586&replyAll=on&referrer=msg#

Look at Pauter Rods. they advertise their design as an x-beam. I can't say
that they are any better based on long term use but a lot of us switched
over due to the increase cost of Carillo's over time.

http://pauter.com/parts/rods/

It just occured to me that you are probably running a custom crank, Chevy
rods with custom pistons to match. They may make comparable models to fit
that too since I believe that setup was designed around the rods.

http://webmail.roadrunner.com/do/mail/message/reply?msgId=INBOXDELIM68586&re
plyAll=on&referrer=msg#
Bob Kramer
rkramer3 at austin.rr.com

---- MadMarx <tr4racing at googlemail.com> wrote: 
> Hi Guys,
> 
>  
> 
> After my engine blow at the last race and a rod in two pieces I
investigated about rod design.
> 
>  
> 
> In US forums I found an interesting opinion:
> 
>  
> 
> H-beam rods are for low rev high torque engine (turbo, compressor)
> 
> I-beam are for medium torque engines with high revs
> 
>  
> 
> As engineer I agree with this statement. On high revs the rod shaft gets
bended back and forth by the inertia caused by the rotation.
> 
> I could imagine that the sharp sides of the H-beam rod will create a crack
after a while because the stiffness for bending along the rotation axis
smaller than with an I-beam rod.
> 
> That means to me that the fatigue resistance is smaller on an H-beam rod
at high revs.
> 
> With high revs on a long stroke engine I mean 6000+.
> 
>  
> 
> The manufacturer of the broken H-beam rod was Scat.
> 
>  
> 
> I think next time I order an I-beam rod from Scat.
> 
>  
> 
> What do you think?
> 
>  
> 
> Cheers
> 
> Chris
> 

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