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11-16-2016, 09:17 AM | #1 |
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Join Date: May 2010
Location: Gardiner Me.
Posts: 4,200
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8BA block---3.390 bore
Hi guys, a friend gave me 8BA bare block a couple day ago. it's been setting in the weather but will the clean in backing oven and short peen. Looking it over yesterday and see that it didn't have a ring ridge, bore is 3.390. I'm getting old but what in h--l piston is that? I got .125 + . 080 I've never heard of that piston. Walt
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11-16-2016, 09:26 AM | #2 |
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Location: Coral Springs FL
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Re: 8BA block---3.390 bore
I bet someone overbored it too much by mistake. There can't be much wall thickness left.
Would be interesting to know. |
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11-16-2016, 09:51 AM | #3 |
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Re: 8BA block---3.390 bore
Walt,
"ring' it a small ball peen hammer....3 o'clock to 9 o'clock will be real interesting. Charlie ny |
11-16-2016, 09:56 AM | #4 |
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Join Date: Jun 2010
Location: San Antonio, Texas
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Re: 8BA block---3.390 bore
Maybe they were going to sleeve it before they found a better block.
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11-16-2016, 10:02 AM | #5 |
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Join Date: May 2010
Location: Chester Vt
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Re: 8BA block---3.390 bore
I ran a 3 7/16 (.437) over on the track and another is running somewhere in New York. So it can be done. best to have it sonic tested Walt.
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11-16-2016, 10:03 AM | #6 |
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Location: Central Ohio
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Re: 8BA block---3.390 bore
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I'd be very interested in knowing what a sonic test of the cylinder walls shows? My guess will be somewhere around .100. |
11-16-2016, 06:11 PM | #7 |
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Join Date: Dec 2010
Location: East Coast in CT
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Re: 8BA block---3.390 bore
I have run a 3.375 plus .030 in the past Jahns made the origianl pistons and Egge made me a replacement set. I have had two complete 3-7/16 bore flathead engines I still have one complete in stock so it can be done like old Ron said.
Just use a sonic tester to figure wall thickness then give Egge a call they will make a 3.375 piston plus oversize up to at least another .030 they did them for me no problem at all. So far I have restored three flathead engines form the ealry days both hot rod and race that were all built larger than 3-3/8 Its just more cubes. |
11-16-2016, 06:14 PM | #8 | |
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Join Date: May 2010
Location: Gardiner Me.
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Re: 8BA block---3.390 bore
Quote:
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11-16-2016, 10:51 PM | #9 |
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Join Date: May 2010
Location: Chester Vt
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Re: 8BA block---3.390 bore
Sometimes I wonder why anything, usually I'm wrong, but my new dog makes me happy. Now what waz the question?
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11-17-2016, 01:08 PM | #10 |
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Location: Regina Canada
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Re: 8BA block---3.390 bore
Rumbleseats last motor was 3-3/8 +.030
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