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Underbody braces, turbos and more!

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PostPosted: Wed Apr 26, 2006 4:34 pm 
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abby normal
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hi to all- was trying to find out if 1.3 DOHC pistons will fit in an 01 1.3 SOHC 16 valve swift.
this should raise the compression and be a pretty cheap mod.
i also plan to port/polish the head , cam change and bigger TB.

found an old thread, it looks pretty good/cheap

:search: :lol: .
http://www.teamswift.net/viewtopic.php? ... highlight=


thanks. don 8)


Last edited by 87t1 on Thu May 18, 2006 9:48 pm, edited 3 times in total.

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PostPosted: Wed Apr 26, 2006 9:13 pm 
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10.6-1 with GT pistons and your stock head.
I'm way ahead of you :wink:

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 Post subject: changing pistons
PostPosted: Wed Apr 26, 2006 9:40 pm 
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abby normal
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:ez_lol: superf1y, thanks for the info.
u are way ahead- but that car in your rearview may be getting closer. :wink:


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PostPosted: Tue May 09, 2006 12:32 pm 
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I thought the bore was larger on the GT?
Are you taking into account the boring of the cyl?


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 Post subject: changing pistons
PostPosted: Tue May 09, 2006 3:48 pm 
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abby normal
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no, i wanted to ask about raising the compression of my 2001 16v 1.3 sohc.
after searching, i found this thread:

http://www.teamswift.net/viewtopic.php? ... highlight=

then superfiy replied-

suprf1y Posted: Wed Apr 26, 2006 7:13 pm Post subject:

--------------------------------------------------------------------------------

10.6-1 with GT pistons and your stock head.
I'm way ahead of you

--------------------------------------------------------------------------------
in reply to your question,
the stock DOHC gti pistons are 74 mm bore, as are the stock 16 v SOHC 1.3

just a cheap way to get more hp from a small motor. hope this answered your question. :)


Last edited by 87t1 on Sat May 20, 2006 6:33 am, edited 2 times in total.

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PostPosted: Wed May 10, 2006 11:37 am 
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Right, but if the DOHC bore is larger than the SOHC bore, the DOHC pistons wont' drop in. You'll have to bore out your block a bit, which affects the final ratio...


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PostPosted: Wed May 10, 2006 11:39 am 
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Also, 10.6:1 sounds decent, but I wouldn't mind trying for 11 or 12:1... has anyone done this or is that just too high for pump gas?
I've been trying to search for this, but "compression" and "ratio" turn up alot of false positives in the search on this site...


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 Post subject: Re: changing pistons
PostPosted: Wed May 10, 2006 11:41 am 
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87t1 wrote:
in reply to your question,
the stock DOHC gti pistons are 74 mm bore, as are the stock 16 v SOHC 1.3

just a cheap way to get more hp from a small motor. hope this answered your question. :)


DOH! I missed that last bit the first time I read your response... sorry.
So, what motor was it that the over 1300ccs? I thought it was the GT's, and the rest had 1295ccs.

Thanks!


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 Post subject: changing pistons
PostPosted: Wed May 10, 2006 12:36 pm 
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abby normal
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hi mrbell- i dont know much about the other motors. :(
the larger suzuki 4 cyl. pistons are from the samari/ sidekick and vitara
engines. if you were looking for more of this info, try looking here-

http://www.teamswift.net/viewforum.php?f=27

p.s. to raise my compression to 11.2 i will mill the head/ block & advance the cam timing.
to find out more info try searching superf1y's postings.

he even has this website: :D

http://www.teamswift.net/redirect.php?banner_id=12

good luck


Last edited by 87t1 on Fri May 19, 2006 1:16 am, edited 1 time in total.

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PostPosted: Wed May 10, 2006 1:49 pm 
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So, do you have a source for the GT pistons?


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 Post subject: changing pistons
PostPosted: Wed May 10, 2006 5:39 pm 
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abby normal
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not yet, i was going to post on this thread,

http://www.teamswift.net/viewforum.php?f=6

and see about trading pistons with a member having a DOHC , wanting to turbo his car.
then all we do is swap, buy new rings, & hone cylinders. :D

i have a spare 16v sohc motor to do the mods on. :thumbsup:

this project is still in the planning stage, looks like cheap fun.


Last edited by 87t1 on Sat May 20, 2006 6:35 am, edited 2 times in total.

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PostPosted: Thu May 11, 2006 9:35 am 
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I was going to mill the head .040 to get my compression up to 10.5:1. I don't know if it will run on pump gas much higher. I was also thinking about 11:1.

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PostPosted: Thu May 11, 2006 12:27 pm 
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I didn't think you could safely take .040 off the head. .030 is the max you can take off a DOHC head, but the SOHC 16v head might have a little more meat on it. And as for the "bore size" stuff i've been reading about.. All the 1.0 and 1.3 motors use a 74mm bore size. It's not until you move up to the 1.6 is when the pistons and bore sizes get bigger. I could fit GTi pistons into a G10 block, but the valves might not appreciate it much :lol: . And the 1.0's are 993cc's, 1.3's are 1298cc's(if I remember correctly)

Good info on the GT pistons in the 1.3 16v sohc block Mike! The GT pistons would be much more capable of handling nitrous too if someone was that inclined to juice their metro :lol:

Oh, and if anyone needs some GT pistons, I've got a set that's been sitting around for a while with just about brand new rings on them. Send me a PM :D

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 Post subject: gti pistons
PostPosted: Thu May 11, 2006 6:08 pm 
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PM sent :)


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PostPosted: Thu May 11, 2006 7:03 pm 
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I've taken .060" from the GT heads before. Its tight, but possible.
If you wanted, you could always angle mill it, and take ~.040" from the intake side, and up to about .100" from the exhaust side.
If you want real high compression on a 3cyl, we used Mk1 3cyl. pistons(flat tops) in the Mk2 motor with .100" machined from the head. If I recall, it was about 13.5-1 :D
If anybody has any crazy ideas, post it up.
Chances are I've already figured out what should work, and how to do it :D

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PostPosted: Fri May 12, 2006 3:06 pm 
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So... looking at this a bit more, I swear that I read something about the wrist pins being different between the Twincam motors and the others. But now all I can find is 19mm is the wristpin diameter. Did I make up there being a difference? Or was one floating and the other wasn't?


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PostPosted: Fri May 12, 2006 6:22 pm 
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I talked to an engine shop today and they said their records show that the non-GT motors(or non-turbo for the G10's) have 17mm wrist pins and the GT and G10T's have 19mm...
I didn't ask, but since people are putting G16 pistons in their G10T's, that must be 19mm...


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 Post subject: changing pistons
PostPosted: Fri May 12, 2006 7:35 pm 
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mrbell- i was going to use a set of 1.3 DOHC (4 cyl) pistons in my 1.3 SOHC ( 4 cyl ) motor.

i dont know about the wrist pin size issue :oops: thought they were the same size. i can always get a set of pins ground to fit. :)

i PM' d geozukigti and we should have a deal for the 1.3 gt pistons. :D

i will post here when i have more news.


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PostPosted: Fri May 12, 2006 8:06 pm 
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As I recall, the GT/SOHC 16V rods are the same.

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 Post subject: changing pistons
PostPosted: Fri May 12, 2006 9:38 pm 
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cool ! :D thanks, superf1y


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PostPosted: Sat May 13, 2006 11:26 am 
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What about the 8-valvers?


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PostPosted: Sat May 13, 2006 1:22 pm 
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Nope.

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PostPosted: Sun May 14, 2006 11:47 am 
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Bummer. Oh, well.
Thanks for the info.
Anyone have a spare set of GT pistons and rods?


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PostPosted: Mon May 15, 2006 12:15 pm 
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So I just found a message you wrote, suprf1y saying the standard 8v rods are good for a couple hundred hp. I'm hoping for the 120hp range, give or take. So the 8v'ers should good, right? But I still need some high comp pistons. I could get some made, I suppose, but I was just thinking... would it be possible to get the GTI pistons bushed down to accept 17mm pins out of the 8v motors? Or would it be better to oversize the rods to accept 19mm pins out of the GT? Seems like you might be running low on material at taht point...


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PostPosted: Mon May 15, 2006 4:29 pm 
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Why would you want to run GT pistons?
The stock 8V pistons should be higher compression because there are only 2 valve reliefs, not 4.
Not that it makes much diff.
From what we have done on the stock 3cyl (nonturbo) rods, I would say that you are safe at 120hp on the 8V rods.
I would stay at, or under 10-1, or at most 10.5-1 on pump gas.
You should be able to do it easily by machining the head.
BTW, use a 1.6 head for the bigger valves.

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