Re: [old-chevy-truck] Overboring
Ken Although .060 is quite common, the main problem we have with larger overbore the original cast cylinder is not centered in the block causing an engine with a short life. For a long lasting or High performance or older engines we highly recommend sleeving along with line boring the crank bores prior to the cylinder boring. Lee Journeyman IAM machinist [Retired] From: Nate To: old-chevy-truck@yahoogroups.com Sent: Saturday, September 24, 2011 6:40 PM Subject: [old-chevy-truck] Overboring It's *very* poor practice on several counts : the cylinder wall get too thin so the engine tends to run too hot and this means short engine life . Plug shift when the block was originally casted means the cylinders may have seriously thin spots in their walls , this leads to drop outs where the cylinder simply fractures fails as you're happily Motoring along If the block is a good 'un , have the cylinders sleeved ~ this will be expen$ive but , boring 0.080 over is plain old silly ~ this means way beyond ill advised and well into foolhardy . Any Machinist who suggests such a thing , is no longer on your team . -Nate Ken Wrote ; Hey guys, I posted a question about boring a 235 .080. last week. It is rare that I don't get at least one hit from you guys. My question is; has anyone bored a 235 chev up to .080. They make pistons that size, but I am getting mixed messages from lots of mechanics and machinests about the adviseability. Thanks for any input. Ken [Non-text portions of this message have been removed] Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: old-chevy-truck-unsubscribe@yahoogroups.comYahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) * To change settings via email: old-chevy-truck-dig...@yahoogroups.com old-chevy-truck-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: old-chevy-truck-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [old-chevy-truck] Overboring
Thanks, Lee, Nate and Jonas for your input. I was pretty much leaning toward having the bad hole sleeved and sticking with the original .060 bore (if the rest of cyls specs out OK). I wasn't looking forward to punching it out to.080 either. I don't need the risk of overheating especially down here in the AZ desert. Ken From: K Lehmann klehm...@bentonrea.com To: old-chevy-truck@yahoogroups.com Sent: Sunday, September 25, 2011 9:06 AM Subject: Re: [old-chevy-truck] Overboring Ken Although .060 is quite common, the main problem we have with larger overbore the original cast cylinder is not centered in the block causing an engine with a short life. For a long lasting or High performance or older engines we highly recommend sleeving along with line boring the crank bores prior to the cylinder boring. Lee Journeyman IAM machinist [Retired] From: Nate To: old-chevy-truck@yahoogroups.com Sent: Saturday, September 24, 2011 6:40 PM Subject: [old-chevy-truck] Overboring It's *very* poor practice on several counts : the cylinder wall get too thin so the engine tends to run too hot and this means short engine life . Plug shift when the block was originally casted means the cylinders may have seriously thin spots in their walls , this leads to drop outs where the cylinder simply fractures fails as you're happily Motoring along If the block is a good 'un , have the cylinders sleeved ~ this will be expen$ive but , boring 0.080 over is plain old silly ~ this means way beyond ill advised and well into foolhardy . Any Machinist who suggests such a thing , is no longer on your team . -Nate Ken Wrote ; Hey guys, I posted a question about boring a 235 .080. last week. It is rare that I don't get at least one hit from you guys. My question is; has anyone bored a 235 chev up to .080. They make pistons that size, but I am getting mixed messages from lots of mechanics and machinests about the adviseability. Thanks for any input. Ken [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: old-chevy-truck-unsubscribe@yahoogroups.comYahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) * To change settings via email: old-chevy-truck-dig...@yahoogroups.com old-chevy-truck-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: old-chevy-truck-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[old-chevy-truck] Overboring
It's *very* poor practice on several counts : the cylinder wall get too thin so the engine tends to run too hot and this means short engine life . Plug shift when the block was originally casted means the cylinders may have seriously thin spots in their walls , this leads to drop outs where the cylinder simply fractures fails as you're happily Motoring along If the block is a good 'un , have the cylinders sleeved ~ this will be expen$ive but , boring 0.080 over is plain old silly ~ this means way beyond ill advised and well into foolhardy . Any Machinist who suggests such a thing , is no longer on your team . -Nate Ken Wrote ; Hey guys, I posted a question about boring a 235 .080. last week. It is rare that I don't get at least one hit from you guys. My question is; has anyone bored a 235 chev up to .080. They make pistons that size, but I am getting mixed messages from lots of mechanics and machinests about the adviseability. Thanks for any input. Ken Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: old-chevy-truck-unsubscribe@yahoogroups.comYahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) * To change settings via email: old-chevy-truck-dig...@yahoogroups.com old-chevy-truck-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: old-chevy-truck-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [old-chevy-truck] Overboring
Some of my best friends are...uh...overboring. Sorry. I had the choice between sleeving and using a different (235) block and I decided to use a good junk block I had access to, and all is well. The block came from a 1962 Buick I think, and it had a couple of lugs in the wrong place so the bird legs no longer fit, but we actually made a beautiful custom center motor mount for it. Unless you are looking for bird legs (which I admit I used to think were cool) you can't even notice it. Thanks jonas On Sep 24, 2011, at 6:40 PM, Nate wrote: It's *very* poor practice on several counts : the cylinder wall get too thin so the engine tends to run too hot and this means short engine life . Plug shift when the block was originally casted means the cylinders may have seriously thin spots in their walls , this leads to drop outs where the cylinder simply fractures fails as you're happily Motoring along If the block is a good 'un , have the cylinders sleeved ~ this will be expen$ive but , boring 0.080 over is plain old silly ~ this means way beyond ill advised and well into foolhardy . Any Machinist who suggests such a thing , is no longer on your team . -Nate Ken Wrote ; Hey guys, I posted a question about boring a 235 .080. last week. It is rare that I don't get at least one hit from you guys. My question is; has anyone bored a 235 chev up to .080. They make pistons that size, but I am getting mixed messages from lots of mechanics and machinests about the adviseability. Thanks for any input. Ken [Non-text portions of this message have been removed] Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: old-chevy-truck-unsubscribe@yahoogroups.comYahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) * To change settings via email: old-chevy-truck-dig...@yahoogroups.com old-chevy-truck-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: old-chevy-truck-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [old-chevy-truck] Overboring
I forgot to mention that my truck is a 1959 3200 Chevy. Cheers. jt On Sep 24, 2011, at 6:46 PM, Jonas Thaler wrote: Some of my best friends are...uh...overboring. Sorry. I had the choice between sleeving and using a different (235) block and I decided to use a good junk block I had access to, and all is well. The block came from a 1962 Buick I think, and it had a couple of lugs in the wrong place so the bird legs no longer fit, but we actually made a beautiful custom center motor mount for it. Unless you are looking for bird legs (which I admit I used to think were cool) you can't even notice it. Thanks jonas On Sep 24, 2011, at 6:40 PM, Nate wrote: It's *very* poor practice on several counts : the cylinder wall get too thin so the engine tends to run too hot and this means short engine life . Plug shift when the block was originally casted means the cylinders may have seriously thin spots in their walls , this leads to drop outs where the cylinder simply fractures fails as you're happily Motoring along If the block is a good 'un , have the cylinders sleeved ~ this will be expen$ive but , boring 0.080 over is plain old silly ~ this means way beyond ill advised and well into foolhardy . Any Machinist who suggests such a thing , is no longer on your team . -Nate Ken Wrote ; Hey guys, I posted a question about boring a 235 .080. last week. It is rare that I don't get at least one hit from you guys. My question is; has anyone bored a 235 chev up to .080. They make pistons that size, but I am getting mixed messages from lots of mechanics and machinests about the adviseability. Thanks for any input. Ken [Non-text portions of this message have been removed] Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: old-chevy-truck-unsubscribe@yahoogroups.comYahoo! Groups Links Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: old-chevy-truck-unsubscribe@yahoogroups.comYahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) * To change settings via email: old-chevy-truck-dig...@yahoogroups.com old-chevy-truck-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: old-chevy-truck-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
