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DIY: Which high cr pistons would fit to 241 baby hemi..
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budweiser
Posted 2017-01-20 4:12 PM (#531880)
Subject: DIY: Which high cr pistons would fit to 241 baby hemi..



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Looking for more compression on 241 baby hemi...what to do with pistons if NOT willing to spend $800 for set of Ross pistons...(Venolia's might be a bit cheaper...)

Please advice if You happen to have deeper knowledge in mysterious world of pistons, is there some other engine which pistons would fit to connecting rods and might be usable (maybe with some piston top modification...?).

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wayfarer
Posted 2017-01-20 4:27 PM (#531882 - in reply to #531880)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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No interchange. Too many variables.

The biggest problem with the 241 is the small bore. Ross and JE are the best prices for these little guys, some others simply do not have the tiny blanks to whittle on.
If you have an $800 quote from Ross then that is about as good as you will find!
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NM Desoto
Posted 2017-01-20 9:00 PM (#531906 - in reply to #531880)
Subject: RE: DIY: Which high cr pistons would fit to 241 baby hemi..


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I had Venoilia build me a set for my 345 and a 413 in the last four years or so. They were both close to $1200 . Excellent parts, just expensive.
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Mopar1
Posted 2017-01-20 10:01 PM (#531909 - in reply to #531906)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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You're problem is the C/r is soooo low. Officially 7-7.1, a 241 measured out at an actual 6.19! probably just need to dig deep & get the pistons.
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mstrug
Posted 2017-01-20 11:08 PM (#531917 - in reply to #531880)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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Keep it low... add some blow! Paxton, McCullough etc.
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Powerflite
Posted 2017-01-20 11:42 PM (#531922 - in reply to #531917)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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Good idea, but then you would really need to use forged pistons, and you are back to spending $800.
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budweiser
Posted 2017-01-21 10:57 AM (#531941 - in reply to #531922)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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There are a lot of pistons with the same bore, hopefully an expert with access to a very good piston catalog will jump in this discussion...241 hemi has a 3.4375" bore which can be found on some Harley Davidsons and Ford tractors for example...connecting rod pin diameter is 0.859".
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Powerflite
Posted 2017-01-21 11:31 AM (#531943 - in reply to #531941)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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You may be able to find a flattop piston like that and then rebush the rods to account for the different rod pin diameter etc, which won't be free. But then a flattop piston isn't going to get you a lot of compression in a hemi motor. No, the only options I can see here are to use low compression stock pistons, find some old racing pistons on Ebay that are still usable (How long are you willing to wait?), or pay the $800 and get custom ones. The latter choice is the best if you want any power out of it. You just have to accept that building an old hemi isn't going to be cheap.

Has anyone tried putting a 315 crank into a 241 to create a stroker motor?
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Mopar1
Posted 2017-01-21 12:38 PM (#531947 - in reply to #531943)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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Powerflite - 2017-01-21 10:31 AM

. You just have to accept that building an old hemi isn't going to be cheap.

?
Don't put in a Bellybutton engine (SBC)!
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Mopar1
Posted 2017-01-21 12:46 PM (#531949 - in reply to #531947)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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he is trying to avoid expensive. strokers are even more expensive. Probably be better off selling the 241 & buying a high deck hemi with decent advertised C/R.
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Chrispy
Posted 2017-01-21 1:04 PM (#531950 - in reply to #531880)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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Get the $800 set in 10:1 and a decent cam, you will be very very happy. Especially if you grab one of the repop 4 barrel manifolds to go with it.

http://hothemiheads.com/dodge/intake_manifolds/intake_1x4_241.270.h...
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budweiser
Posted 2017-01-21 2:00 PM (#531953 - in reply to #531880)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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This engine is going to a vintage style '32 hiboy hot rod, and baby hemi is an obvious choise instead of the more typically used flathead F*rd.
Intake will be an Offenhauser 3x2. ( still searching for small enough carburetors).

Edited by budweiser 2017-01-21 2:01 PM
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57chizler
Posted 2017-01-21 3:55 PM (#531960 - in reply to #531941)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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budweiser - 2017-01-21 7:57 AM
241 hemi has a 3.4375" bore which can be found on some Harley Davidsons...connecting rod pin diameter is 0.859".


There's a thought. Harley 74" engines (Knucklehead, Panhead, Shovelhead through 1977) had the 3.437 bore, a .791" pin and a sizeable dome. Looks doable, only kicker might be the compression height which is around 1.625"-1.750".

Since they're usually sold in sets of two, eight of them might cost more than the custom pistons for the 241.

Edited by 57chizler 2017-01-21 3:56 PM




(HD Pist.jpg)



Attachments
----------------
Attachments HD Pist.jpg (74KB - 291 downloads)
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wayfarer
Posted 2017-01-22 4:39 PM (#532046 - in reply to #531953)
Subject: Re: DIY: Which high cr pistons would fit to 241 baby hemi..



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budweiser - 2017-01-21 11:00 AM

This engine is going to a vintage style '32 hiboy hot rod, and baby hemi is an obvious choise instead of the more typically used flathead F*rd.
Intake will be an Offenhauser 3x2. ( still searching for small enough carburetors).


The 97's and 94's only move about 150cfm...you certainly won't have too much for a 10:1 241.
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