BIG BLOCK FORD
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Connecting rod length

4 posters

Go down

Connecting rod length Empty Connecting rod length

Post  EverySparePenny December 10th 2019, 9:05 pm

Is there any association of tuning window to rod length?

As in, the longer rod narrows the tuning window where a shorter rod can broaden the window. Or vise versa

EverySparePenny

Posts : 114
Join date : 2017-12-19
Location : Iowa

Back to top Go down

Connecting rod length Empty Re: Connecting rod length

Post  c.evans December 11th 2019, 12:45 am

Some people think there is, due to the piston acceleration with shorter rods, away from TDC. However, when you do the math, it might amount to a small difference such as .003". IMO that's flyshit, and is a non issue. I would rather go with longer rods and reduce rod angularity on the cylinder side wall.
Charlie

c.evans
BBF VENDOR SPONSOR
BBF VENDOR SPONSOR

Posts : 2260
Join date : 2008-12-03

Back to top Go down

Connecting rod length Empty Re: Connecting rod length

Post  BOSS 429 December 11th 2019, 1:32 am

EverySparePenny wrote:Is there any association of tuning window to rod length?

As in, the longer rod narrows the tuning window where a shorter rod can broaden the window. Or vise versa


It depends on a few things,What you are doing with the engine. Deck height, Runner lenght,and planed RPM
BOSS 429
BOSS 429

Posts : 2372
Join date : 2009-08-10
Location : Ill

Back to top Go down

Connecting rod length Empty Re: Connecting rod length

Post  rmcomprandy December 11th 2019, 11:30 am

EverySparePenny wrote:Is there any association of tuning window to rod length?

As in, the longer rod narrows the tuning window where a shorter rod can broaden the window. Or vise versa

The difference is minimal other than where the downforce of the piston combination exerts pressure.
A shorter rod will exert more pressure on the cylinder wall and less on the main bearing saddle as a function of rod angularity in the bore where the power forces are taking place above the piston. A longer rod will do just the opposite.
Unless you are talking about an inch of difference then it will not be much.
A longer rod will move the piston very slightly slower near the top of the bore but, faster than a shorter rod near the bottom of the bore

The biggest difference will be with a stroker engine where the shorter rod will expose more of the piston to the crankcase below the bore at the bottom of the stroke.

rmcomprandy

Posts : 6160
Join date : 2008-12-02
Location : Roseville, Michigan

http://www.rmcompetition.com

Back to top Go down

Connecting rod length Empty Re: Connecting rod length

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum