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PostPosted: Sat Apr 24, 2004 9:43 pm 
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Location: iowa
I just want to know the differences in them.

Bore x stroke etc etc


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PostPosted: Sun Apr 25, 2004 7:48 pm 
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Location: Adelaide, Australia
sorry i dotn have an exact number for you but the stroke is about 10mm les and the bore is about 3mm from memory.


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 Post subject: I was told
PostPosted: Sun Apr 25, 2004 7:54 pm 
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I was told that they are the same but for bore size is that true?

That the rods and crank and all that stuff is the same.


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PostPosted: Sun Apr 25, 2004 8:07 pm 
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Location: Waterloo, ON Canada
The rods are the same the crank is different...


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PostPosted: Sun Apr 25, 2004 8:18 pm 
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Spends Too Much Time Under The Hood

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Location: Adelaide, Australia
no they definatly have a shorter stroke. im sure is 10mm but might be a little either side. they have a different crank but they may have the same rod im not sure, they can do that using a different crank and different pistons im told. the stroke is the reason that the 1600 revs so hard.


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PostPosted: Sun Apr 25, 2004 10:00 pm 
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http://www.4g61t.com/forum/viewtopic.php?t=99&por=1%22

Liink to 4G61T specifications

4G61T 81MM bore 75.5MM stroke
4G63T 85MM bore 88MM stroke

1.6DOHC revs fast for three reasons:
1)short stroke
2)small size bore
3)no balance shafts

Yes the two motors share the same connecting rod.


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