measuring cylinder bore

devadasy · 08-18-2011, 05:10 PM

can a vernier caliper be used to measure the cylinder bore since I do not have a bore gauge. I am trying to find out if the cylinder is still usable with oversized piston.

madoc1 · 08-18-2011, 06:37 PM

i don't think so. you can do what i did and just get a piston kit, then check the clearance. after deglazing the bore. if you have more than .007 cleance, using feeler gauges, send the kit back and order the whole top end kit. on an 83, i bet you will need it. this 89 had 120 psi before break in just using the new piston and rings. it was on the ragged edge of .007.

crash12888 · 08-18-2011, 07:53 PM

You can use two pins or nails side by side held with pliers to measure the bore but you will need to measure four places and if you will be doing this type of work often a bore gauge kit might be in order.

http://www.ebay.com/itm/6-Pieces-Mac...#ht_1915wt_879

Thunder9000 · 08-19-2011, 08:45 AM

you most definately need a bore gauge to measure if there is wear where the piston rings actually travel. a vernier will only measure at the top of the bore which is probably unaffected by the piston ring.i think most auto parts stores will rent those types of tools.

madoc1 · 08-19-2011, 12:43 PM

Quote:

Originally Posted by crash12888

You can use two pins or nails side by side held with pliers to measure the bore but you will need to measure four places and if you will be doing this type of work often a bore gauge kit might be in order.

http://www.ebay.com/itm/6-Pieces-Mac...#ht_1915wt_879

cool tip crash. never heard of that!

rusty shackel · 08-19-2011, 04:23 PM

dude , just take it to the machine shop they will mic> it and tell you if they rebore it they probbably will not charge u nothing.
and best of all it done right .

rusty s

Dave Box · 08-19-2011, 05:16 PM

It really doesn't matter what you use to measure it the answer is that it is not usable with an oversized piston. The bore will have worn in a non concentric pattern as there will have been blowby in one or more places. If you really want to use that cylinder (instead of buying a top end replacement kit) then you are going to have to bore it at +25 or +50 and use the appropriate piston. Using a new piston in an old bore is a certain recipe for insanity.

Dave

Night · 08-19-2011, 05:21 PM

Or as the farmers do around here. Bore it out and place a sleeve in it. You can take it back to factory specs. I did a Chevy 350 engine that had a hole in the water jacket. Worked like a charm.

Mark

08-18-2011, 05:10 PM	#1
devadasy Not Yet Wild Join Date: Aug 2011 Posts: 22	measuring cylinder bore can a vernier caliper be used to measure the cylinder bore since I do not have a bore gauge. I am trying to find out if the cylinder is still usable with oversized piston.
devadasy Not Yet Wild Join Date: Aug 2011 Posts: 22

08-18-2011, 06:37 PM	#2
madoc1 no clue Join Date: Sep 2009 Location: spicewood, texas Posts: 3,308	Re: measuring cylinder bore i don't think so. you can do what i did and just get a piston kit, then check the clearance. after deglazing the bore. if you have more than .007 cleance, using feeler gauges, send the kit back and order the whole top end kit. on an 83, i bet you will need it. this 89 had 120 psi before break in just using the new piston and rings. it was on the ragged edge of .007.

08-18-2011, 07:53 PM	#3
crash12888 Gone Crazy Join Date: Jan 2007 Location: Chesterfield, Va Posts: 6,021	Re: measuring cylinder bore You can use two pins or nails side by side held with pliers to measure the bore but you will need to measure four places and if you will be doing this type of work often a bore gauge kit might be in order. http://www.ebay.com/itm/6-Pieces-Mac...#ht_1915wt_879

08-19-2011, 08:45 AM	#4
Thunder9000 Not Yet Wild Join Date: Mar 2009 Location: Ontario,Canada Posts: 15	Re: measuring cylinder bore you most definately need a bore gauge to measure if there is wear where the piston rings actually travel. a vernier will only measure at the top of the bore which is probably unaffected by the piston ring.i think most auto parts stores will rent those types of tools.

08-19-2011, 04:23 PM	#6
rusty shackel Gone Wild Join Date: Jul 2010 Location: s/w pa Posts: 364	Re: measuring cylinder bore dude , just take it to the machine shop they will mic> it and tell you if they rebore it they probbably will not charge u nothing. and best of all it done right . rusty s

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08-19-2011, 05:16 PM	#7
Dave Box Respect the Cart Join Date: May 2010 Location: Rocky Mount, Virginia Posts: 2,190	Re: measuring cylinder bore It really doesn't matter what you use to measure it the answer is that it is not usable with an oversized piston. The bore will have worn in a non concentric pattern as there will have been blowby in one or more places. If you really want to use that cylinder (instead of buying a top end replacement kit) then you are going to have to bore it at +25 or +50 and use the appropriate piston. Using a new piston in an old bore is a certain recipe for insanity. Dave

08-19-2011, 05:21 PM	#8
Night Gone Wild Join Date: Aug 2011 Location: West Central Illinois USA Posts: 294	Re: measuring cylinder bore Or as the farmers do around here. Bore it out and place a sleeve in it. You can take it back to factory specs. I did a Chevy 350 engine that had a hole in the water jacket. Worked like a charm. Mark

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