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442OLDS 12-16-2011 06:26 PM
Honda Rod Journals
 
I run a 2.5 inch rod journal in a car over 3900 pounds.

If somebody is running a Honda rod size crank journal,is there a given weight where the forces of accelerating a heavy vehicle will cause crankshaft failure,or is everything safe as long as the reciprocating assembly is as light as possible?

Chad Rhodes 12-16-2011 09:52 PM
Re: Honda Rod Journals
 
Quote:
Originally Posted by 442OLDS (Post 299323)
I run a 2.5 inch rod journal in a car over 3900 pounds.

If somebody is running a Honda rod size crank journal,is there a given weight where the forces of accelerating a heavy vehicle will cause crankshaft failure,or is everything safe as long as the reciprocating assembly is as light as possible?
It has more to do with stroke and overlap of the main/rod journals.

Ed Wright 12-16-2011 10:18 PM
Re: Honda Rod Journals
 
Quote:
Originally Posted by Chad Rhodes (Post 299380)
It has more to do with stroke and overlap of the main/rod journals.
Yep.

engineguy 01-15-2012 03:24 PM
Re: Honda Rod Journals
 
Quote:
Originally Posted by Ed Wright (Post 299394)
Yep.

X3. A short stroke engine with significant main/rod journal overlap can use small diameter rod journals, regardless of vehicle weight.
I have not personally built a stroker engine with small (Honda/Quad 4) rod journal sizes, but many engine builders who specialize in strokers seem to shy away from the small rod pin.

Run to Rund 01-15-2012 03:28 PM
Re: Honda Rod Journals
 
The common mod for an Olds is to go from the 2.5" stock crank pin to 2.2" BBC size. The smaller big end of the rod also helps with cam lobe clearance with strokes longer than 4.25" on the Olds.

442OLDS 01-15-2012 03:50 PM
Re: Honda Rod Journals
 
Quote:
Originally Posted by Run to Rund (Post 304040)
The common mod for an Olds is to go from the 2.5" stock crank pin to 2.2" BBC size. The smaller big end of the rod also helps with cam lobe clearance with strokes longer than 4.25" on the Olds.

You are correct.

IF I was building a Super Stock car,I would take one of the many 425 cranks that I have and do just that!


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