Engine load vs RPM and torque

[Don.F.Broadus at ucm.com]

reciprocating forces increase at the square of the RPM so 15 psi at 5500
would most likely be better over all with a good piston and ample bearing
clearance.  My  $.02  

> -----Original Message-----
> From:	bearbvd at sni.net [SMTP:bearbvd at sni.net]
> Sent:	Wednesday, April 07, 1999 8:46 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: Engine load vs RPM and torque
> 
> >Hi all,
> >
> >This is a little off charter but is still related somewhat (especially to
> >those with artificial aspiration.)
> >
> >I'm looking for some software or code (Matlab, Working Model etc...) that
> >will allow me to calculate the loads seen by the piston, rod, etc for
> >various torque/speed combinations. For instance, is it better to make 100
> HP
> >using 15 psi of boost at 5500 rpm or 100 HP at 6500 RPM using 7 psi of
> >boost...
> >
> >I'd like to be able to input the weights of the piston and rod, and the
> >torque value to obtain their loadings. Most people will tell you the
> largest
> >loads are seen on the exhuast stroke at TDC,
> 
> This is in tension---
> 
>  but that doesn't explain why
> >those turbo Honda's start bending rods at 10 psi...
> 
> This is instability under compressive loading (column failure.
> >
> >I have a small single cyl that I'm going to be putting a blower on. In
> it's
> >current configuration, the factory tells me additional revs will
> seriously
> >comprimise reliability. OK, but with the blower, what is the ideal speed
> for
> >my desired HP?
> >
> >Repond off list if you feel compelled. Thanks.
> 
> Right off the top--I section rods are more stable under compression
> loading
> (boost), as are aluminium rods (heftier section for same weight) (which is
> why fuelers like them). H section rods will be lighter for same strength,
> to get higher revs, but not as stable under high compressive loads.
> Aluminium is not good for SUSTAINED high revs because of no fixed
> endurance
> limit in tension.
> 
> Regards, Greg
> >
> >
> >Matt Beaubien
> >mbeaubie at ualberta.ca
> >3 x 510
> >1 x 300ZXT
>