rod length

General engine tech -- Drag Racing to Circle Track

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mlearn

rod length

Post by mlearn » Tue Jun 10, 2003 4:05 pm

Hi Don,

Could you tell me the general range(i know it will vary with the combination)in degrees that the piston speed just starts to have and affect on the air column when scavenging is done or as it is ending


Thanks

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speedtalk
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Post by speedtalk » Tue Jun 10, 2003 9:20 pm

Well, it's somewhere between TDC and when the exhaust valve closes. Exactly where, I have no idea. Maybe engine simulation software can help. Look for one that will display the cyl. pressure / volume graph (data). What are you trying to figure out? Thanks, Don

mlearn

rod length

Post by mlearn » Tue Jun 10, 2003 10:33 pm

I understand the benefits of different rod lengths depending on the engine combination. I was wanting to get a general idea of when piston speed starts to have an affect to get me in the ball park and give me a starting point to get the most out of any particular combination. I dont have access to a flow bench or dyno but my intuition is usually pretty good.

Thanks

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