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04-25-2024, 01:22 PM | #21 | ||
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Re: The absolute 'MINIMUM' cylinder wall thickness....
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04-25-2024, 01:26 PM | #22 | |
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Re: The absolute 'MINIMUM' cylinder wall thickness....
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04-25-2024, 09:03 PM | #23 | |
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Re: The absolute 'MINIMUM' cylinder wall thickness....
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1 - If I was doing engine rebuilds like you do, I would first, sonic check the cylinder walls to be sure it was a valid candidate for rebuild. To me, this would mean an absolute minimum overbore from stock, not to exceed .060. 2 - If you were doing builds like I do, there would be no warranty so all you have to do is protect your reputation with quality work and consistently build winners. For those that may not know, all out race engines come with no warranty. |
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04-26-2024, 07:31 AM | #24 | |
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Re: The absolute 'MINIMUM' cylinder wall thickness....
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#1 - Yes, based on the thoughts of mine and several others, the prudent method is a maximum overbore of 0.060 and then sleeve back to 3.875" on a used cylinder block. The only other caveat is the cylinder walls still need to be more than 5MM or 0.200" when finished resizing at 0.060. That basically allows room for 0.020" of rust or pitting damage to the inside of the block. #2 - Yep. |
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04-26-2024, 09:57 AM | #25 | |
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Re: The absolute 'MINIMUM' cylinder wall thickness....
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I just do not subscribe to this over overbore theory However I have stopped doing any rebuilding and machine work unless it is done to my specifications ie oiling system, bearing setups, and part preparation including the final assembly. J
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04-26-2024, 02:32 PM | #26 |
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Re: The absolute 'MINIMUM' cylinder wall thickness....
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I'm running a .100 over block with no issues and runs cool 5.5 head. Engine put together about five years ago. |
04-27-2024, 09:18 AM | #27 |
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Re: The absolute 'MINIMUM' cylinder wall thickness....
Brent, You are not going to get an exact answer to your question. I agree with Updraught that liners should be installed. For one thing, they are harder than the original cast iron and will last longer. After spending thousands on rebuilding an engine, the cost of the liners is in the noise level.
The Alfa Romeo wet cylinder liners are 0.111 thick so you can use this as a rough gauge. The bore is a little over 4 inches.
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