4 inch bore engine

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Passatman
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4 inch bore engine

Post by Passatman »

Ok guys i have seen where it was mentioned here that the oxyboxer retains it's stud location when going 4 inch bore.
Has anyone done this engine as a daily driver and how was the performance, did the engine cool well? I am thinking about doing a 4 inch bore daily driver.
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Marc
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Re: 4 inch bore engine

Post by Marc »

It's my understanding that if you want to run 4" cylinders with decent wall thickness the studs still need to be moved out a little. One of the modifications Rocky Jennings is set up to do (he moves 'em .050"). I'd definitely ask for his input, he's probably seen more oxyboxers than anyone.
http://www.rockyjennings.com/
Passatman
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Re: 4 inch bore engine

Post by Passatman »

I will be contacting him in October.
ecksrash
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Re: 4 inch bore engine

Post by ecksrash »

Any more info Passatman??
Passatman
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Re: 4 inch bore engine

Post by Passatman »

Ecksrash no info yet i haven't approach rocky as yet. I should have some info in october.
Passatman
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Re: 4 inch bore engine

Post by Passatman »

I approached rocky and he isnt too fun of the idea. You might be lucky in checking with brothers machine shop, spoke to those guys sometime ago and the guy on the phone said they had done a 4 inch bore oxyboxer for a customer.

I will be doing a 94mm bore engine instead as the options for a 4inch head is costly. My choice of head was JPM 230 heads.
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Chip Birks
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Re: 4 inch bore engine

Post by Chip Birks »

Rocky didn't like the 4 inch bore idea? I thought that was half the benefit of using the wbx case for these oxy builds...why doesn't he want to do it?
Passatman
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Re: 4 inch bore engine

Post by Passatman »

It's my guest that the cost of machining would be prohibitive. What i wanted to do was use a waterboxer head on the oxy engine bottom half, something similar to the porsche 959 engine.
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Chip Birks
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Re: 4 inch bore engine

Post by Chip Birks »

Like a water cooled head with aircooled cylinder.
Passatman
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Re: 4 inch bore engine

Post by Passatman »

Yes that's it.
Passatman
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Re: 4 inch bore engine

Post by Passatman »

Yes that's it.
tmbryhn
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Re: 4 inch bore engine

Post by tmbryhn »

Revitalizing this one. What kind of combo did you end up with?

Im considering building a street Oxy with 4" cylinders, MS230 and one of my 84mm WBX cranks.

These kits from AA seem quite nice to get the job done, and they have the option of running a 6-stud pattern.
Has anyone checked these out?
Is the bolt pattern in these the same as stock WBX/Type 4?

https://aapistons.com/products/101-60mm ... -be-edited
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Chip Birks
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Re: 4 inch bore engine

Post by Chip Birks »

Do type4 and wbx share a stud pattern? I didn't realize that.
Steve Arndt
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Re: 4 inch bore engine

Post by Steve Arndt »

Chip Birks wrote: Sun Aug 28, 2022 8:54 am Do type4 and wbx share a stud pattern? I didn't realize that.
They do not. T4 has a rectangular stud pattern.
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