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PostPosted: Sun Jan 07, 2007 3:40 am 
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Ok so i have been hoarding parts to build a engine that blends old/new school. I am trying to stick to as much oem stuff as i can sourced from self serve auto recyclers

I am starting with a 1298cc block (g13ba) , putting in a 1324cc crank (g13a/77mm stroke) and hopefully boring it out to 76mm (pending some piston availability) which should give me a displacement of 1397cc/85ci.
(if not it will be 75.5mm pistons, 1379cc/84ci)

So now i am trying to decide on a head combo for my 1.4l :razz:

I have both a 8v 1.3l head and a 8v 1.6l head (vitara/geo-tracker/sidekick) at the moment.

The 1.6l is designed for a 75mm bore so i am thinking it is close to the 76mm.

It has larger exhaust valves and takes a bigger mechanical pump (its going to be carbureted).

The 1.3l probably has a smaller chamber which may up the compression, plus it has a higher redline?

Taken from Superfly's cam page i also noticed the cams are exact oposite

1.3 8V 330/192 (Longer intake)
1.6 8V 202/356 (longer exhaust)

At the moment i am thinking 1.6l head + 1.3l cam as the bore x stroke of 76x77 is in a similar ratio to the 74x75.46 of the g13ba.

The power curve should remain proportionatly similar with a 6500rpm redline (a bonus as it will match the cars gearing)

Will this be better than sticking with the 1.3l head and 1.3l cam?
What effect would it have if i used the 1.6l head and 1.6l cam?
(or the 1.3l head with the 1.6l cam :lol: )

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PostPosted: Sun Jan 07, 2007 3:55 am 
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the 330/192 is lift/duration. the 1.6 cam is listed backwards. it should read 356/202.

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PostPosted: Sun Jan 07, 2007 8:09 am 
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That is correct.
As far as I recall, the chambers are the same in both heads, with the 1.6 having bigger intake, and exhaust valves.
If you have to stick with the stock cam, use the 1.6, but remember, it has the 90 degree dist. drive for the trucks.
If you can, use the 1.6 head, and have a cam ground with about 220 duration at .050"/and about .380"-.400" lift(about .280" -.290" at the lobe).
That combo will make awesome power to about 6500RPM.

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PostPosted: Sun Jan 07, 2007 4:28 pm 
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Well that's a relief it obviously was confusing me no end :oops:

So the 1.6l cam has slightly more lift/duration. (right angle distributer is no problem)

It is my new candidate :razz:
The only other question i guess is the lobe seperation identical in the two cams or is one slightly wider than the other.

how would this be measured if ppl don't know?

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PostPosted: Sun Jan 07, 2007 5:57 pm 
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Its the same.
It is a better profile, but I would not call it high performance.
Since you are already going to alot of trouble, why not just have one ground up?
It will be well worth it.

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PostPosted: Mon Jan 08, 2007 2:25 am 
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When it's all finished i will probably get one ground up and put it in but i am aiming for Super-Budget-Build-Challenge i'm hopping to get it close to a 1.6l carb swap price tag cost wise.
(popular upgrade cheap upgrade here in australia)

I may not be able to match the torque (G16a 8v has 127nm instead of 100nm of g13, 27% more, i set my goal at 110nm/ 10% increase) but i figured i may come close with the hp (g16a =55kw/74hp, i am aiming for 80hp )

I'm keeping my goals small and tight :razz:

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PostPosted: Wed Mar 21, 2007 3:42 am 
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Trying to find the best 76mm piston to fit in my 8v g13 engine and i've come back to the original idea of sidekick/tracker 1mm oversize idea.

Everyone seems to have dished dome pistons like this
Image

Just like some help trying to figure if the 76mm piston with GT rods is too low of a compression to be rectified by shaving the head or should i bite the bullet and stick with 1mm g13 flat tops (75mm pistons, givin 83ci, 1361cc)

i am using standard 1.6l 8v head

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PostPosted: Sat Jun 09, 2007 11:28 pm 
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got some sidekick/tracker pistons, with a set of digital calipers i measured them to be same dimensions as samurai pistons (save the bore and piston pin diameter) so it looks like i need no skimming/decking.

Now i checked out this thread in the Fuel Economy section

http://www.teamswift.net/viewtopic.php?t=29755

and superf1y posted that a gt pulley on the 'E' setting gives a +4 advance for an XFi Cam. Would i get +4 advance on a 8v 1.6l stock cam as well?
superf1y wrote:
Lift/Duration at .050"
1.3 8V 330/192
1.6 8V 356/202


My train of thought is that if the extra 10 degrees of duration shifts the power up 500-1000rpm then the advance pulley will bring it back down 500- 800rpm which would make it similar to a cam with only extra lift?

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PostPosted: Sat Jun 09, 2007 11:35 pm 
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Quote:
My train of thought is that if the extra 10 degrees of duration shifts the power up 500-1000rpm then the advance pulley will bring it back down 500- 800rpm which would make it similar to a cam with only extra lift?

Kinda, but my guess is that you'll want to run it at zero, and take advantage of the extra 10 degrees.

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PostPosted: Sun Jun 10, 2007 12:28 am 
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sweet :D

i guessing i can to both and see which is best, probably go for an adjustable cam sprocket so i can change it at whim if it gives a notable difference at either end.

would leaving it on the 'I' with the gt cam sprocket give me a +2 advance or a zero?

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PostPosted: Sun Jun 10, 2007 12:35 am 
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Zero, if I recall.

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PostPosted: Tue Mar 10, 2009 9:54 pm 
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What is the possibility of using the 1.6 cam on the 1.3 head. just to get the extra duration


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PostPosted: Tue Mar 10, 2009 10:04 pm 
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You can do it, if you're using it in a truck.
The dist drive is different.

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PostPosted: Sun Apr 12, 2009 6:57 am 
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Y not just slap on the g13B head? get some oversized pistons for the GTI and u're done?


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PostPosted: Fri Apr 24, 2009 11:41 pm 
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gee its been 2 years :shock: i got all the parts now (well except the rings)

peaceful83: Early model suzukis had right angle dizzys (which may be interchangeble with the 1.6 cam?)
like superfly said its hardly a performance upgrade, but in the old 83-85 with ignition and exhaust upgrades it might add some eh pep? =)

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