Author Topic: ohv rod  (Read 4199 times)

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Offline #1 briggs racer

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ohv rod
« on: May 20, 2009, 11:26:06 am »
what kind of ohv rod would fit in the 25 or 28 flathead

Offline George Herrin

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Re: ohv rod
« Reply #1 on: May 20, 2009, 11:34:29 am »
the 28 series 494504s thats is your using the stock piston.
George Herrin #6
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Offline #1 briggs racer

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Re: ohv rod
« Reply #2 on: May 20, 2009, 12:24:28 pm »
if u put that in a 25 will it stroke

Offline Old Goat

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Re: ohv rod
« Reply #3 on: May 20, 2009, 12:35:24 pm »
No.
The crank is what determines the stroke, not the rod.
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Offline #1 briggs racer

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Re: ohv rod
« Reply #4 on: May 20, 2009, 12:52:04 pm »
is it a longer rod will the crank also fit

Offline George Herrin

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Re: ohv rod
« Reply #5 on: May 20, 2009, 01:51:33 pm »
NO the rod is not longer they all use the same length rod the cranks are different strokes. Look thru the flathead section this has been gone over and over and over...
George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
8 time ARMA National Champion
4 time USLMRA National Champion
Retired from BP
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My other racer is a 1/5th scale Dirt Late Model!!!!

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Re: ohv rod
« Reply #6 on: May 20, 2009, 08:49:12 pm »
is it a longer rod will the crank also fit

To put it simple the 25 block Is shorter than the 28 block, and the rod from either engine will interchange. You can take the older 28" I/C ohv rod (small journal crank) and put in a 25". The only real difference other than they look alot different is that the ohv rod cap is a little stronger. And on that note. If the rods look different the bolts and caps will not interchange, heck the torque specs are even different. Now as far as the crank goes, if you are trying to put a 28" crank in a 25" block I think you will have clearance issues, not to mention about 70 thou of piston sticking out of the block that would either rip the head off or break something internal.

 

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