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Re: [Fot] TR4a block.

To: Brian Ray <brianray@sonic.net>
Subject: Re: [Fot] TR4a block.
From: Ponostyle <ponobill@gmail.com>
Date: Thu, 28 May 2026 09:26:53 -0700
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Cc: FOT@autox.team.net
Delivered-to: mharc@autox.team.net
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References: <084B99F1-B015-4B9B-BC35-8C0D5F014D33@sonic.net>
Iâ??d be tempted to use it, cast iron is so prone to cracking, especially in 
thin sections. I doubt the crack would have any effect once the sleeves are in 
place. One thing you donâ??t want to do is attempt some repair. Even with all 
the torturous work required to weld cast iron repairs gnerally create more 
cracks than they fix. Bridging the center main bearing cap is a relatively 
simple and useful modification. More necessary for high RPM engines and steel 
cranks, but given the bearng cap material itâ??s a reasonable caution for any 
TR motor. 

> On May 27, 2026, at 1:05â?¯PM, Brian Ray <brianray@sonic.net> wrote:
> 
> Good afternoon, FOT,
> I have this crack in the bridge between cylinders 2 and 3. Is this something 
> I would have to consider replacing the block for? I am building this to a 
> fast road specification. With that said, should I also bridge or strap the 
> center main bearing cap? Any guidance is appreciated.
> Thank you,
> Brian Ray
> <image0.jpeg><image1.jpeg>
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