[Fot] Racing rod design

Thu Jul 23 13:29:56 MDT 2015

In addition to the rotating mass issues, the recip weight inertial forces create heavy tensile loads in the rods & bending loads in the crank @ TDC high rpm...
FWIW
Glen

-----Original Message-----
From: Aaron <hpspitfire at gmail.com>
To: fot <fot at autox.team.net>
Sent: Thu, Jul 23, 2015 2:15 pm
Subject: Re: [Fot] Racing rod design

I guess I'm confused.  How much worse is the stroke of a tr4.   

In my spitfire 1500 we use stock rods and a stock crank shaft and shift point is 7200 rpm. Guys using the moldex cranks and forged rods are getting 8500 or so.   And these are the pauter x style.  

Are you sure the initial failure was the rod and not something before that?  

AaronJohnson 

H Prod spitfire 1500  

Sent from my iPhone 

On Jul 23, 2015, at 07:40, John Hasty <  jhasty at mhc-law.com> wrote:  

Gee Whiz….you guys know a h- - - of a lot more about this than me, but I reason that if Manley etc. make a rod that withstands the rigors of a 800+ hp American V8 turning upwards of 9000 rpm and it costs ½ of what P and C are charging it makes sense to use them…..

John H. Hasty | MULLEN HOLLAND & COOPER P.A.

Attorney at Law

301 South York Street  (zip: 28052) 
 P.O. Box 488 
 Gastonia, NC 28053-0488 
 Telephone: 704.864.6751 | Facsimile: 704.861.8394 
 JHasty at mhc-law.com | www.mhc-law.com

From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of John Styduhar
 Sent: Thursday, July 23, 2015 9:59 AM
 To: Christian Marx; Triumph 'Friends of Triumph
 Subject: Re: [Fot] Racing rod design

Pauter has been making this design for almost 30 years with zero cold failures.  If it were a poor design they would have changed it out of necessity.  According to a Pauter rep., the main reason they started manufacturing their own rods in the first place was due to the fact that the H beam and I beam rods they were using couldn’t put up with what they were throwing at them with their turbo charged 4cylinder engines.   

If you spin a rod bearing, eventually you will break anything. 

On Thu, Jul 23, 2015 at 9:49 AM, Christian Marx <tr4racing at googlemail.com> wrote:

I saw the pictures of Pauter.
 This type has no material were it needs and too much were it doesn't make sense.  Maybe for very short rods usable. 

Am 23.07.2015 14:46 schrieb "John Styduhar" <johnstydo at gmail.com>:

The Pauter design is a cross-beam (an inside-out H beam) not an x-beam and shares H-beam design properties because of this. 

On Thu, Jul 23, 2015 at 3:34 AM, MadMarx <tr4racing at googlemail.com> wrote:

Today I had a look to a book called race car design.

It also contains engines, and as detail rods and their designs. I, H, blade – no x-beam (seems they never got the idea that someone could get the idea of an x-beam rod)

They said that F1 uses I-beam rods because they have the best stiffness to weight ratio.

Also German DTM-cars use I-beam rods.

https://en.wikipedia.org/wiki/Deutsche_Tourenwagen_Masters

Cheers

Chris

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