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G13 engine sizes
https://auszookers.com/forum/viewtopic.php?f=5&t=52868
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Author:  suzukitas [ Mon Jul 25, 2016 11:12 pm ]
Post subject:  G13 engine sizes

Was just throwing a g13 engine back in a sj80 today and noticed the size difference on g13a (1324cm3) g13b(1298cm3).
I sure someone will answer this easy as to where the difference lies, just curious that's all.

Author:  fordem [ Tue Jul 26, 2016 4:09 am ]
Post subject:  Re: G13 engine sizes

The stroke is longer, the bore is the same.

Author:  suzukitas [ Tue Jul 26, 2016 8:39 am ]
Post subject:  Re: G13 engine sizes

So just the crank is a little different, block height remains same?

Author:  fordem [ Tue Jul 26, 2016 10:47 am ]
Post subject:  Re: G13 engine sizes

Let me rephrase that - the difference in capacity comes from a longer stroke, and whilst I'm not 100% certain, I believe the block crank & rods are different.

Author:  alien [ Tue Jul 26, 2016 11:55 am ]
Post subject:  Re: G13 engine sizes

Fun fact - it was changed so the swift could race in rally (under 1300cc).

Author:  MrRocky [ Tue Jul 26, 2016 3:14 pm ]
Post subject:  Re: G13 engine sizes

Some may say its not noticeable but i prefer the 1298cc donks
Just have a nicer feel through the revs

Author:  suzukitas [ Tue Jul 26, 2016 6:41 pm ]
Post subject:  Re: G13 engine sizes

block is bigger? by how much? I used the g13b and it had square timing belt and I changed to round? problem?

Author:  suzukitas [ Tue Jul 26, 2016 7:00 pm ]
Post subject:  Re: G13 engine sizes

Just measured block, they are same.

Author:  fordem [ Wed Jul 27, 2016 1:05 am ]
Post subject:  Re: G13 engine sizes

suzukitas wrote:
I used the g13b and it had square timing belt and I changed to round? problem?


The belt profile needs to match the pulleys - square tooth belt with square tooth pulleys, no problem - round tooth belt with round tooth pulleys, no problem - round tooth belt with square tooth pulley (or vice versa), PROBLEM.

You'll find many such minor differences, some of the crank pulleys are four hole, some are five...

Author:  henno [ Wed Jul 27, 2016 7:05 am ]
Post subject:  Re: G13 engine sizes

alien wrote:
Fun fact - it was changed so the swift could race in rally (under 1300cc).


Holden famously did the same thing for Group A homologation: the 308 becoming 304ci to be under the 5L capacity limit.

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