Just measured my "83mm" bore GE block
10-14-2003, 02:10 PM
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Just measured my "83mm" bore GE block
cyl size in mm
4 82.92
3 82.88
2 82.83
1 82.62
ah well. I'm getting CP's, and they're supposed to be exactly 83.00 mm right? So i guess i just need to re-bore slightly and re-hone...or can i just hone and clear out the extra meat in there?
i don't know if machine shops can just bore out that little amount, but then again, if its just like a drill bit, im sure they have an 83.000000 mm bit right?
4 82.92
3 82.88
2 82.83
1 82.62
ah well. I'm getting CP's, and they're supposed to be exactly 83.00 mm right? So i guess i just need to re-bore slightly and re-hone...or can i just hone and clear out the extra meat in there?
i don't know if machine shops can just bore out that little amount, but then again, if its just like a drill bit, im sure they have an 83.000000 mm bit right?
10-14-2003, 02:13 PM
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Re: Just measured my "83mm" bore GE block (Response)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Response »</TD></TR><TR><TD CLASS="quote">cyl size in mm
4 82.92
3 82.88
2 82.83
1 82.62
ah well. I'm getting CP's, and they're supposed to be exactly 83.00 mm right? So i guess i just need to re-bore slightly and re-hone...or can i just hone and clear out the extra meat in there?
i don't know if machine shops can just bore out that little amount, but then again, if its just like a drill bit, im sure they have an 83.000000 mm bit right? </TD></TR></TABLE>
aren't you suppose to send the pistons in w/ the block your getting bore to whatever machine shop is doing the work so the specs will be right..make sense??ha!
4 82.92
3 82.88
2 82.83
1 82.62
ah well. I'm getting CP's, and they're supposed to be exactly 83.00 mm right? So i guess i just need to re-bore slightly and re-hone...or can i just hone and clear out the extra meat in there?
i don't know if machine shops can just bore out that little amount, but then again, if its just like a drill bit, im sure they have an 83.000000 mm bit right? </TD></TR></TABLE>
aren't you suppose to send the pistons in w/ the block your getting bore to whatever machine shop is doing the work so the specs will be right..make sense??ha!
10-14-2003, 02:14 PM
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Re: Just measured my "83mm" bore GE block (espanol)
well, i would have, except i bought the bare block off someone, the pistons he had, i didn't want because the compression was not what i wanted
10-14-2003, 02:31 PM
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Re: Just measured my "83mm" bore GE block (Response)
Those bore # look like just a quick bore and they are not finished (needing honing). I would take the block and pistons to a shop and get them to bore and hone the cylinders to the pistons...unless you have the machinery at your house to do it... 
Also remember that the pistons should come with a spec sheet for clearances as well to go by.
Modified by PWRVTEC at 6:51 PM 10/14/2003
Also remember that the pistons should come with a spec sheet for clearances as well to go by.
Modified by PWRVTEC at 6:51 PM 10/14/2003
10-14-2003, 02:33 PM
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Re: Just measured my "83mm" bore GE block (Response)
A machine shop isn't going to be able to "bore" that out to 83mm. what they are probably going to do is hone them out until they reach the spec. It's really not a big deal your local machine shop should be able to help you out for realatively cheap. just bring in your pistons when you have them do it.
10-14-2003, 03:07 PM
#6
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Re: Just measured my "83mm" bore GE block (T-sohctec)
You actually DON'T need to bring the pistons to the machine shop. Just have the shop hone your block to dead nuts 83.000mm. The proper clearance is built into the CP's and your block will be perfect. CP's are the most accurate piston made.
10-14-2003, 03:34 PM
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Re: Just measured my "83mm" bore GE block (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote"> CP's are the most accurate piston made.</TD></TR></TABLE>
Thats good to know.
They will be my next set for sure.
Thats good to know.
They will be my next set for sure.
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10-14-2003, 03:42 PM
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Re: Just measured my "83mm" bore GE block (PWRVTEC)
You need to donate each piston to each cylinder and hone the cylinders so that you get the correct clearance depending on what piston goes in what hole.
10-14-2003, 03:59 PM
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Re: Just measured my "83mm" bore GE block (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote">You actually DON'T need to bring the pistons to the machine shop. Just have the shop hone your block to dead nuts 83.000mm. The proper clearance is built into the CP's and your block will be perfect. CP's are the most accurate piston made.</TD></TR></TABLE>
isn't cp a company started by disgruntled je workers?
isn't cp a company started by disgruntled je workers?
10-14-2003, 04:25 PM
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Re: Just measured my "83mm" bore GE block (espanol)
...but you still should take your pistons to the machine shop as a reference, because all machine shops' measuring equipment isn't calibrated the same and used at the same temperature the pistons were measured at by the manufacturer.
I could take blocks to several shops and ask them to bore and hone to a certain specification...and they'd measure correctly at those shops, however, bring them to a place where the blocks can be at the same temperatures and measured by the same equipment, and I guarantee they wouldn't all be the same.
I could take blocks to several shops and ask them to bore and hone to a certain specification...and they'd measure correctly at those shops, however, bring them to a place where the blocks can be at the same temperatures and measured by the same equipment, and I guarantee they wouldn't all be the same.
10-14-2003, 04:33 PM
#11
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Re: Just measured my "83mm" bore GE block (espanol)
When JE was bought out by a large corporation, the 3 Calvert Bros saw the writing on the wall. They left to form a piston company for those who wanted the very best. Their state of the art equipment checks to the millionths of an inch. I've toured their plant and it was everything they claim.
10-14-2003, 04:43 PM
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Re: Just measured my "83mm" bore GE block (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote"> CP's are the most accurate piston made.</TD></TR></TABLE>
Ummm not to really stir anything up, but maybe you are just talking about for imports . . . I will agree that they do make a very nice piston.
Ummm not to really stir anything up, but maybe you are just talking about for imports . . . I will agree that they do make a very nice piston.
10-14-2003, 04:49 PM
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Re: Just measured my "83mm" bore GE block (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote">You actually DON'T need to bring the pistons to the machine shop. Just have the shop hone your block to dead nuts 83.000mm. The proper clearance is built into the CP's and your block will be perfect. CP's are the most accurate piston made.</TD></TR></TABLE>
Earl is definitely right and so is everyone else, all you need is a little honing and you will be fine. The CP pistons are so pretty its too bad you have to put them in your block
Earl is definitely right and so is everyone else, all you need is a little honing and you will be fine. The CP pistons are so pretty its too bad you have to put them in your block
10-14-2003, 04:49 PM
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Re: Just measured my "83mm" bore GE block (AVATAR)
I would still mic each piston and then have someone do the final bore and hone to each piston. Each piston should have its own individual home called a cylinder.
When my machinist did mine he got one piston, mic'd it then did the final bore and hone and measured the clearances. Then another piston and did the same thing and so on till he got to the last cylinder. Not everyone is perfect and even piston companys can be off one day and that one day could be the day when your pistons were made.
art
When my machinist did mine he got one piston, mic'd it then did the final bore and hone and measured the clearances. Then another piston and did the same thing and so on till he got to the last cylinder. Not everyone is perfect and even piston companys can be off one day and that one day could be the day when your pistons were made.
art
10-14-2003, 05:10 PM
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Re: Just measured my "83mm" bore GE block (Arturbo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Arturbo »</TD></TR><TR><TD CLASS="quote">Each piston should have its own individual home called a cylinder.
art</TD></TR></TABLE>
yeah..screw those pistons that want to leave home and move out of your block..
art</TD></TR></TABLE>
yeah..screw those pistons that want to leave home and move out of your block..
10-14-2003, 05:16 PM
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Re: Just measured my "83mm" bore GE block (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote">CP's are the most accurate piston made.</TD></TR></TABLE>
I bet not more accurate the OEM
I bet not more accurate the OEM
10-14-2003, 05:30 PM
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Re: Just measured my "83mm" bore GE block (Arturbo)
Well said, I would probably put my money on some Accralites or Venolia's, but none of us has a couple thousand dollar budget on pistons I'll probably run CP's in my next build.
I'll probably run CP's in my next build.
10-14-2003, 06:59 PM
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Re: Just measured my "83mm" bore GE block (tHIS oNE)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tHIS oNE »</TD></TR><TR><TD CLASS="quote">Not to threadjack...
Does Anyone make hyperutectic pistons?</TD></TR></TABLE>
Good question.
Does Anyone make hyperutectic pistons?</TD></TR></TABLE>
Good question.
10-14-2003, 07:10 PM
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Re: Just measured my "83mm" bore GE block (Arturbo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Arturbo »</TD></TR><TR><TD CLASS="quote">I would still mic each piston and then have someone do the final bore and hone to each piston. Each piston should have its own individual home called a cylinder.
When my machinist did mine he got one piston, mic'd it then did the final bore and hone and measured the clearances. Then another piston and did the same thing and so on till he got to the last cylinder. Not everyone is perfect and even piston companys can be off one day and that one day could be the day when your pistons were made.
art</TD></TR></TABLE>
This is exactly correct. We always "assign" each piston to it's own cylinder and have the machine shop we use "individually bore" each cylinder. It's the most accurate way to do things.
When my machinist did mine he got one piston, mic'd it then did the final bore and hone and measured the clearances. Then another piston and did the same thing and so on till he got to the last cylinder. Not everyone is perfect and even piston companys can be off one day and that one day could be the day when your pistons were made.
art</TD></TR></TABLE>
This is exactly correct. We always "assign" each piston to it's own cylinder and have the machine shop we use "individually bore" each cylinder. It's the most accurate way to do things.
10-28-2003, 02:06 PM
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Re: Just measured my "83mm" bore GE block (VaporTrail)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VaporTrail »</TD></TR><TR><TD CLASS="quote">
This is exactly correct. We always "assign" each piston to it's own cylinder and have the machine shop we use "individually bore" each cylinder. It's the most accurate way to do things.</TD></TR></TABLE>
I agree with both Art and Vapor. I always have the pistons honed to its own cylinder.
I definetly do not agree with Earl on just boring to said CP spec and thats it. Certain applications will need different piston/wall specs. Especially in a FI/NO2 motor where tight is not best. I will almost always go .001 over what is called as piston/wall clearance in high boost turbo apps.
On a side note. I do like the CP pistons. We sold a couple sets and Im sold! My next build will be an 83mm using their pistons. Only thing that sucks *** is they only offer a 9:1 compression for the 83mm. I really want to go a bit higher than that.......oh well, I'll just crank up the boost .5 psi and compensate.
This is exactly correct. We always "assign" each piston to it's own cylinder and have the machine shop we use "individually bore" each cylinder. It's the most accurate way to do things.</TD></TR></TABLE>
I agree with both Art and Vapor. I always have the pistons honed to its own cylinder.
I definetly do not agree with Earl on just boring to said CP spec and thats it. Certain applications will need different piston/wall specs. Especially in a FI/NO2 motor where tight is not best. I will almost always go .001 over what is called as piston/wall clearance in high boost turbo apps.
On a side note. I do like the CP pistons. We sold a couple sets and Im sold! My next build will be an 83mm using their pistons. Only thing that sucks *** is they only offer a 9:1 compression for the 83mm. I really want to go a bit higher than that.......oh well, I'll just crank up the boost .5 psi and compensate.
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