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 Post subject: Differences between g13a and g13b motors?
PostPosted: Mon Aug 25, 2003 2:15 am 
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Location: Terre Haute, IN. USA
I haven't gotten a swift yet, but keep asking questions as to what there is to do to them to peak my interest. I want to know the difference between the g13a and g13b motors. I want to swap the dohc head onto the g13a and keep the lower compression pistons and block for that matter, is this even possible? (sorry guys if i sound like a moron, i've only tuned rotary engines) I eventually want to turbocharge the motor and prevent detonation with the lower compression pistons while recieving the benefits of a 16v head.


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 Post subject: RE: Differences between g13a and g13b motors?
PostPosted: Mon Aug 25, 2003 4:05 am 
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G13A and G13B share pretty much just the block, the internals pistons head intake and exhaust manifolds are very different. A GTi head wont go on a G13A black without GTi pistons because G13A pistons dont hav the notches in the top for the 4v per cylinder so you will munch the valves. A set of vitara pistons would fit and drop cr to around 8.5:1 i think it is.


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 Post subject: RE: Differences between g13a and g13b motors?
PostPosted: Mon Aug 25, 2003 5:25 am 
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G13A crank cast - G13B crank forged
G13B has main bearing brace G13A doesn't.
G13A bore = 74mm, stroke = 77mm cc=1324
G13B bore= 74mm, sttroke =75.5 cc=1298


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 Post subject: RE: Differences between g13a and g13b motors?
PostPosted: Mon Aug 25, 2003 3:31 pm 
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Location: Terre Haute, IN. USA
Nevermind, it'll be easier swapping motors. G13b is going to be more durable anyway, thanks.


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 Post subject: Re: Differences between g13a and g13b motors?
PostPosted: Sat Aug 30, 2003 4:49 am 
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Location: Antigua
hey dude the dohc head on the 13a block will work fine even better than the 13b because is has low compressin pistions already make turbocharging an ease with the correct fuel management system you can do wonders my curent setup is an 13b with 8 valve pistons that came from the 13b sohc engin which has only 2 valve releave slots and they do not toutches the valves
i know of the 13a with the gti head when i had my mk1 that is what i used when i couldn't get a 13b

bin there dun that

trust me there is only one thing i haven't tried on my swift as yet but planning to soon is nos ....


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 Post subject:
PostPosted: Tue Sep 02, 2003 2:52 pm 
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Location: U.S.A
i was told the head from the dihc engine wouldn't fit onto the g13a block because i have been wanting to do the the swap in my other car. its a 96 geo metro same g13a as the rest. if this will really work what else do i need to change besides the pistons.


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 Post subject:
PostPosted: Fri Sep 05, 2003 2:28 am 
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Location: Antigua
guys i am going to put together a video withe the actual setup of the swap and post it on my site soon ...this is a link to my site http://nigel.da.ru
you will see some of my spare engines there


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 Post subject: Re: Differences between g13a and g13b motors?
PostPosted: Wed Oct 08, 2008 1:24 am 
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Location: Terre Haute, IN. USA
Bump from the dead, but are you sure Vitara pistons can drop right in? I used those pistons in a Honda motor quite a few years back, it had a 75mm bore. The cylinders would have to be bored.


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 Post subject: Re: Differences between g13a and g13b motors?
PostPosted: Wed Oct 08, 2008 7:57 am 
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Correct, you need to rebore.

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 Post subject: Re: Differences between g13a and g13b motors?
PostPosted: Fri May 19, 2017 5:37 pm 
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Location: Seattle
O 16581 72452 5 wrote:
Bump from the dead, but are you sure Vitara pistons can drop right in? I used organifi to lose weight with those pistons in a Honda motor quite a few years back, it had a 75mm bore. The cylinders would have to be bored.


Yeah you are right. They do need to be rebored.


Last edited by Hirano on Sat Oct 07, 2017 5:31 pm, edited 2 times in total.

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 Post subject: Re: Differences between g13a and g13b motors?
PostPosted: Sat May 20, 2017 10:21 am 
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