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QldRobbo
tinkerer


Joined: 11 Apr 2002
Posts: 455

PostPosted: Mon Jul 08, 2002 6:21 am    Post subject: Overbore Reply with quote

G'day,
Anyone know whats the maximum you can bore out a 1600? How many mm or thou can you add to the bore of this motor? I have a friend of a friend who says he bored a 1600 out by 10mm to make the capacity 2L without changing the stroke. That sounds a little much to me... is there really over a cm of spare metal on the cylinder walls?!
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motoboy
tinkerer


Joined: 19 May 2002
Posts: 152

PostPosted: Mon Jul 08, 2002 3:22 pm    Post subject: Re: Overbore Reply with quote

my gems 1.6 is 60 thou over n i heard that was about the most u can go or the walls get to thin, i think 60 thou gets close to a 1.8 im not sure but thats my two cents
cheers
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MR_GEMI
hod rodder


Joined: 05 Oct 2001
Posts: 7826
Location: Adelaide

PostPosted: Mon Jul 08, 2002 3:46 pm    Post subject: Re: Overbore Reply with quote

hahaha if 60 thou is as far as they go then im well over my water jackets.
i have a 216 thou overbore making it a total capacity of 1803cc.
A 60 thou overbore leaves total capacity of 1643cc.

hope that helps...

cheers,
kev
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TXcoupe
petrol head


Joined: 05 Oct 2001
Posts: 1675

PostPosted: Mon Jul 08, 2002 8:20 pm    Post subject: Re: Overbore Reply with quote

u can go on a 1600 up safely is 120 thou or 3mm and i think u might be able to go bigger on the 1800 and i think the 2L is the only one to be able to go 60 thou

and mark m,y bros G200 was sleeved and his cap was about 2.3
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Ben Wight
backyard mechanic


Joined: 04 Oct 2001
Posts: 946

PostPosted: Tue Jul 09, 2002 2:40 am    Post subject: Re: Overbore Reply with quote

a gemini bore is 82mm, a 2 litre bore is 87mm, so you can safely bore about 1.5mm past that, thats 6.5mm total.

The only problem is the 2 litre pistons have different pin heights, so you need different rods.

Ben Wight
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QldRobbo
tinkerer


Joined: 11 Apr 2002
Posts: 455

PostPosted: Tue Jul 09, 2002 2:58 am    Post subject: Re: Overbore Reply with quote

Yeah, thanks Ben, that's actually what I thought myself, don't know what these other guys are talking about.

So for anyone else who can't do the maths, a 1600 bored out to the max, which would be 88.5, and without modifying the stroke/crank actually makes 1844cc.

Robbo
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