Gday.......
just a quick one, is a 173 block the same as a 202?i've been that the
only difference is the crank stroke. if this is true, could u use a 202 crank in a 173
to bring it out to 202ci with the right pistons?
would this work?
cheers peter
202 /173
Started by
_runna_202_
, May 16 2006 01:55 PM
8 replies to this topic
#2
Dr Terry
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Posted 16 May 2006 - 02:08 PM
Hi runna 202.
No, the 173 has a smaller bore than a 202. It's the 186 that has the same bore as a 202. You cannot bore a 173 to a 186 bore size.
The 173s can have either of 2 types of crank in them, the early ones have the same small journal size as 179/186 etc. The later 173s have the same large journal size as a 202. So theoretically you can stroke a 173 using a 202 crank. Problem then would be the pistons, but it was a good idea though.
Dr Terry.
No, the 173 has a smaller bore than a 202. It's the 186 that has the same bore as a 202. You cannot bore a 173 to a 186 bore size.
The 173s can have either of 2 types of crank in them, the early ones have the same small journal size as 179/186 etc. The later 173s have the same large journal size as a 202. So theoretically you can stroke a 173 using a 202 crank. Problem then would be the pistons, but it was a good idea though.
Dr Terry.
#4
makka
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Posted 16 May 2006 - 02:18 PM
I read somewhere that 173s had the thick block walls similar to a 179 so they could be bored out a bit bigger, how true that is I dont know
#5
_CHOPPER_
_CHOPPER_
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Posted 16 May 2006 - 07:30 PM
Why would you bother? 179,186 and 202 blocks are cheap enough anyway.
#6
Dr Terry
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Posted 17 May 2006 - 10:36 AM
Hi Guys.
CHOPPER is correct, why would you bother.
The only possible exception would be if you had a nice stock original car with a 173 & you wanted to keep the same engine block & numbers for originality.
A good 173 block could be bored to 179 std bore size, but no more & then you could use some stock bore pistons. But as I said, if you stroke it then what do you do for pistons.
Dr Terry.
CHOPPER is correct, why would you bother.
The only possible exception would be if you had a nice stock original car with a 173 & you wanted to keep the same engine block & numbers for originality.
A good 173 block could be bored to 179 std bore size, but no more & then you could use some stock bore pistons. But as I said, if you stroke it then what do you do for pistons.
Dr Terry.
#7
makka
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Posted 17 May 2006 - 03:28 PM
Im not saying that you would want to do it, just that you could.
I have no need to, there is a 202, 186 and a 179HP (186 bore) sitting in my shed at home that cost under $200 total including a YT head and 2 opel 4 speeds (1 reco)
I have no need to, there is a 202, 186 and a 179HP (186 bore) sitting in my shed at home that cost under $200 total including a YT head and 2 opel 4 speeds (1 reco)
#8
_ToranaGuy_
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Posted 20 May 2006 - 02:57 AM
Couldn't you use the 173 pistons with the 202 crank & rods? Wouldn't it give a full 202 cubes?
Cheers
ToranaGuy
Cheers
ToranaGuy
#9
_CHOPPER_
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Posted 20 May 2006 - 11:20 AM
No. A stock bore 173 with a 202 crank will give you around 187 CID. Problem is you then need a custom piston, as the stock one will hit the head due to the longer stroke.
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