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Wisconsin, Need 5-3/4" diameter Pistons


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  #1  
Old 07-02-2015, 10:24:11 PM
Alan D. Alan D. is offline
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Default Wisconsin, Need 5-3/4" diameter Pistons

I am looking for a possible replacement piston to install in an early teens 4 cylinder Wisconsin Model M "T" head engine. This engine is no little toy, it has a 5-3/4" Bore and a 7" stroke. According to the ALAM HP calculation, it is a true 60 hp engine. It needs a full rebuild. Before I go to the expense of casting pistons, I thought I would check here. I understand that some models of Fairbanks has the same bore, 5-3/4", so maybe pistons can be sourced. I do have one piston that I can measure the compression height if we come up with a potential piston. Thanks in advance for your time to respond.
Alan Dewsnup
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Old 07-03-2015, 07:23:36 AM
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

5 3/4" would be the FM ZC 208. Pistons are available but a bit pricy. What is the distance from the wrist pin center to the top of the piston (compression height)? Also, wrist pin diameter? There also may other options.
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Old 07-03-2015, 02:49:15 PM
Alan D. Alan D. is offline
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

Hello and Thanks for your taking time to reply to my Wisconsin piston need. I measured the original cast iron piston and this is what I got:

Wrist Pin OD: 1-7/16"
Comp. Height: 3-1/2" (center to top of piston)
Ring Configuration: 4 ring (no oil ring on skirt)

I will try to attach a couple of pictures of the piston for you evaluation.

Al
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Old 07-03-2015, 10:01:17 PM
dkamp dkamp is offline
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

That one doesn't look like it's too bad... is it damaged somewhere?
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Old 07-05-2015, 10:45:10 AM
Alan D. Alan D. is offline
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

Hello DCAMP, Sadly yes it does have damage that makes in very unsuitable for using again. Then that makes it so I would change them all out for balance, etc. The problem is a hairline crack around one of the wrist pin bosses. I don't think you can see it in the photo I provided. I will try to get another picture and post it also. Egge is always an option, but am hoping to run down another alternative source and maybe save a bit on the end cost.
Alan

---------- Post added at 10:45 AM ---------- Previous post was at 10:42 AM ----------

**NOTE** I just looked at my side view of the damaged piston, look closely around the circumference of the wrist pin port and you will see the hairline fracture.
Al
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Old 07-05-2015, 01:31:57 PM
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

That is quite a crack, I'd say you are smart to not use it. Another thing to keep in mind is weight. A different piston paired with a stock may throw you out of ballance.

I'll measure up a 208 when I get to work Monday and give you some dimensions. The Arrow C66 has a 5 3/4" too.
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Old 07-06-2015, 11:27:14 PM
Alan D. Alan D. is offline
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

Hello, I checked with the fellow over at Arrow Industries. The compression height on the Arrow C66 is 4.5, about 1" to tall to work for me. Have you had a chance to see if the Fairbanks 208 has a close comp. height? I also heard that one or two of the big Cat gas engines may have a 5-3/4" piston.
Alan
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Old 07-07-2015, 11:15:45 AM
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

Hey Allan I checked the 3304/3306 Cat gas pistons.....no go they are only 4.67" diameter
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Old 07-07-2015, 11:44:16 AM
Alan D. Alan D. is offline
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

Hello Doug,
I do not have any piston charts. Do yo have access to a chart that may give me an idea if any pistons, at all, are available that could be reworked and used in the Wisconsin 4 cylinder I have? Not a lot of 5-3/4" pistons are used anymore. It may be that I will need to wrap this original piston I have and have a set of investment pistons cast up.
Alan

---------- Post added at 11:42 AM ---------- Previous post was at 11:38 AM ----------

Second thought Doug...... Does your Cat information give the wrist pin and compression height? I also have an old G-30 Farmall that I would like to put some oversized pistons in. The Cat. piston you mention may be something to evaluate for that project. I assume that the Cat Gas pistons are aluminum?
Alan

---------- Post added at 11:44 AM ---------- Previous post was at 11:42 AM ----------

Third thought....that would be F-30 not G-30. My finger didn't mind me!
Al
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Old 07-07-2015, 12:13:30 PM
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Doug Waggonner Doug Waggonner is offline
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Default Re: Wisconsin, Need 5-3/4" diameter Pistons

No I'm sorry, I do not. but yes the Cat gas pistons are alum.
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