Connecting rod length theroy......

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NHRA Pro Stock Rod Ratios

Post  mkopmani on February 26th 2013, 10:01 pm

The individual I interface with runs the Pro Stock NHRA circuit full-time. Rod ratio is in the 1.50 range.

Remember that deck heights are in the 9.400" neighborhood - no room for a long rod. Rods are Carrillo steel, NASCAR rod bearing, small block Mopar mains.

Mike

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Re: Connecting rod length theroy......

Post  Lem Evans on February 26th 2013, 10:11 pm

The 'cup' stuff was/is at 2.00" for the main bearings...I aint got no idea what a small mopar is. When the Ford stuff went to the 302 2.250" main I thought that was small...shows what I know Laughing

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Re: Connecting rod length theroy......

Post  cool40 on February 26th 2013, 10:59 pm

i know some truck pullers that use a "honda" rod bearing,whatever size that is. Laughing
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Re: Connecting rod length theroy......

Post  Lem Evans on February 26th 2013, 11:03 pm

cool40 wrote:i know some truck pullers that use a "honda" rod bearing,whatever size that is. Laughing

~ 1.880". The IRL stuff is ~ 1.850".

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Re: Connecting rod length theroy......

Post  DanH on February 26th 2013, 11:55 pm

mkopmani wrote:The individual I interface with runs the Pro Stock NHRA circuit full-time. Rod ratio is in the 1.50 range.

Remember that deck heights are in the 9.400" neighborhood - no room for a long rod. Rods are Carrillo steel, NASCAR rod bearing, small block Mopar mains.

Mike

he runs a small bore long stroke engine in p/s . one of ways with a 1.5 r/r with a 9.4 deck block, other a high c/h piston

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Re: Connecting rod length theroy......

Post  DanH on February 26th 2013, 11:57 pm

Lem Evans wrote:
cool40 wrote:i know some truck pullers that use a "honda" rod bearing,whatever size that is. Laughing

~ 1.880". The IRL stuff is ~ 1.850".

Ford cup W cranks also used the 1.850"

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Re: Connecting rod length theroy......

Post  whatbumper on February 27th 2013, 1:21 am

Our small block is 1.74 and top sportsman car is 1.34 both work fine.

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Re: Connecting rod length theroy......

Post  Lem Evans on February 27th 2013, 9:46 am

DanH wrote:
Lem Evans wrote:
cool40 wrote:i know some truck pullers that use a "honda" rod bearing,whatever size that is. Laughing

~ 1.880". The IRL stuff is ~ 1.850".

Ford cup W cranks also used the 1.850"

Yes, they used the IRL bearing size.

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