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40 horse rod limits
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young1956
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Joined: September 29, 2015
Posts: 13
Location: Illinois
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PostPosted: Fri Jul 27, 2018 7:49 am    Post subject: 40 horse rod limits Reply with quote

Hey everybody,
Has anyone successfully overbored the pin end of a 40 horse rod for a 22mm pin? Is there a source for an aftermarket rod at the stock length? The shortest I can find new is 5.325 I believe. Any help or experience with this would be appreciated!
Carl
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fl59bug
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Joined: November 23, 2005
Posts: 683

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PostPosted: Sat Jul 28, 2018 7:21 am    Post subject: Re: 40 horse rod limits Reply with quote

AA is making some cool chromoly 36hp rods with either 20mm or 22mm wrist pin diameters:

https://aapistons.com/collections/connecting-rods/...type-36-hp

So maybe at some point they will do this for the 40hp as well.
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luvthemvws
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Joined: February 13, 2012
Posts: 114
Location: Middle of nowhere
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PostPosted: Sat Jul 28, 2018 7:51 am    Post subject: Re: 40 horse rod limits Reply with quote

I have reworked the 40 horse rods for 22mm pins several times. It works well... for moderate rpm combinations.
I actually like them for mini-stroker engines using A pistons. Keeps the engine narrow. Although, it requires a bit more machine work than the typical tight-wad engine "builder" is willing to do. (The rod work and shortening the cylinders)
I really like the torque increase at low rpms. It makes the engine feel as though it were a much larger displacement!
I recommend using ARP rod bolts (like the Formula Vee racers use).
My current 1800 powers my split Bus-and-trailer down the highway at 65 mph with no problem.
Give it a try!
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gregson1
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Joined: December 13, 2004
Posts: 436

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PostPosted: Mon Jul 30, 2018 7:18 pm    Post subject: Re: 40 horse rod limits Reply with quote

Which ARP bolts? Do you have a part number?
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