Guys,
Q 1) can you tell me if 60 thou is the last size for the bore of a 202 ?
Q2) what happens if this is the case ?
Q) i assume that the markings on this piston mean that it is bored to 60 thou
The piston has the following markings in the inner circle;
RA 20506 060
TOP 002 YB
the photo was too large and i cannot re size at home.
any technical advice on the above would be appreciated.
grant.
Is 60 thou the last bore size ?
Started by
_Agent 34_
, Sep 19 2010 07:25 PM
6 replies to this topic
#2
_Agent 34_
_Agent 34_
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Posted 19 September 2010 - 07:57 PM
her it is
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#3
_mello92_
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Posted 19 September 2010 - 08:13 PM
Yes that means it is 60 thou over, and well, it depends who you talk to Grant about wether its the last size or not.
The guy I bought my supra box off had a 80 thou over 202 making 230RWHP and it did a 4th gear 6000RPM static burnout for 58 seconds and the temp was just starting to creep towards 90 degrees celcius.
I understand it has a lot to do with the efficiency of your cooling system.
The guy I bought my supra box off had a 80 thou over 202 making 230RWHP and it did a 4th gear 6000RPM static burnout for 58 seconds and the temp was just starting to creep towards 90 degrees celcius.
I understand it has a lot to do with the efficiency of your cooling system.
#4
greens nice
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Posted 19 September 2010 - 08:27 PM
60 is basically it in my books.
i have a 186 + 80 here and has funny marks in the bores, my guess is the paper thin bores moving around and rings not sealing like they should be.
80 over might be alright if motor was very mild but i would just try and find another block.
i have a 186 + 80 here and has funny marks in the bores, my guess is the paper thin bores moving around and rings not sealing like they should be.
80 over might be alright if motor was very mild but i would just try and find another block.
Edited by greens nice, 19 September 2010 - 08:28 PM.
#5
FastEHHolden
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Posted 19 September 2010 - 08:52 PM
If you are really attached to it you can sleeve it...but its all money.
#6
rodomo
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Posted 19 September 2010 - 09:09 PM
The engine in this thread is out to .080"
I'm going to wipe it's bum and try it in a month or 2...................
Er......the way I'm working at the moment?.......make that a year or 2.
http://www.gmh-toran...=1
I'm going to wipe it's bum and try it in a month or 2...................
Er......the way I'm working at the moment?.......make that a year or 2.
http://www.gmh-toran...=1
#7
enderwigginau
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Posted 22 September 2010 - 03:12 PM
Depends which mould was used when the block was cast - some will go to 80 thou, other only 60 as bigger hits the water passages.
As above ^^ if worried or in doubt you can sleeve it (used to be about $80 per cylinder), even AFTER the water jacket is exposed, but preferably not
As sleeves are not the pariah they once were - they can be put in without any chance of a slip. Many, many race engines are sleeved as a matter of course.
Suggestions would be o/s rings, another block then look at 80thou and/or sleeves if you want to keep that particular block.
Better still, you can have a light bore then sleeve back to 60thou, which is what I did to a stroker years ago. And the sleeves are still perfect, including the bores, even after the pistons went kapput. I best get that block out of the father-in-laws shed so he has more room for hotrod building.......
Grant..
As above ^^ if worried or in doubt you can sleeve it (used to be about $80 per cylinder), even AFTER the water jacket is exposed, but preferably not
As sleeves are not the pariah they once were - they can be put in without any chance of a slip. Many, many race engines are sleeved as a matter of course.Suggestions would be o/s rings, another block then look at 80thou and/or sleeves if you want to keep that particular block.
Better still, you can have a light bore then sleeve back to 60thou, which is what I did to a stroker years ago. And the sleeves are still perfect, including the bores, even after the pistons went kapput. I best get that block out of the father-in-laws shed so he has more room for hotrod building.......
Grant..
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