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 Post subject: 98 1.3L engine questions
PostPosted: Thu Jun 11, 2015 8:56 pm 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
I am building a SOHC 16 valve engine for my second car with a 3.79 or 4.10 5 speed transmission.
The 2nd car will be my long hall road trip car.
The DOHC GT engine and transmission on 98 ODB2 electronics is fun, but it lacks bottom end.
The questions are for the 98 SOHC 1.3L
Oil orfice in the head is only 0.046". The cam bearings look great, but I was wondering if anyone has opened
the orfice to a larger size? How big did you go? Would you do it again?
I have sent PM to superfly about a cam for this application, but he never answers the PM's I send him.
So I have taken the What cam to use question to open forum to see if he will respond.
Hey superfly, what cam would you recommend?
The hardest thing to find for the 98 1.3L engine has been a good exhaust manifold without the build in cat.
A header is an option but I have heard good and bad about the SuzukiRD headers. With my luck I would get
a crappy one.
There are two types of crankshaft drive pulleys. One older style is a solid steel drive pulley. The newer drive pulleys
have a rubber dampener built into them. Which one to use is the question?

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Fainya
97 Geo Metro LSI,1.3L-GT-DOHC-16v,4.10 5-speed,A/C,170,000,suspension lowered 1",4 wheel disk brakes,15"alloy wheels with 185/50-15 Toyo's,GT bucket seats,analog oil pressure gauge,cruise control, new paint job. 40 mpg at 65 mph.
Good, fast, cheap. You only get two.


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PostPosted: Thu Jun 11, 2015 9:24 pm 
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Sticky at the top of this very forum

viewtopic.php?f=30&t=48005

The DOHC can make good bottom end power on the stock cams with the right tune. You need compression, and lots of timing in the right places. 4.39 trans works well and is almost no hit in MPG The 3.79 would be a bad choice for either.

I don't recall seeing that PM, but I get a shitload of them

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PostPosted: Fri Jun 12, 2015 6:52 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
Thanks for the DOHC info. Do you have a link for cam tuning?
Ok I read the thread. So 2.0" exhaust.
I will make another 47 mm throttle body for it.
I have a good set of GT pistons I can use to get 10.6 o 1.
I have a new GT exhaust manifold to use.
So what cam would you recommend for the 98 SOHC

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Fainya
97 Geo Metro LSI,1.3L-GT-DOHC-16v,4.10 5-speed,A/C,170,000,suspension lowered 1",4 wheel disk brakes,15"alloy wheels with 185/50-15 Toyo's,GT bucket seats,analog oil pressure gauge,cruise control, new paint job. 40 mpg at 65 mph.
Good, fast, cheap. You only get two.


Last edited by fainya on Fri Jun 12, 2015 7:06 am, edited 1 time in total.

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PostPosted: Fri Jun 12, 2015 7:02 am 
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fainya wrote:
Thanks for the DOHC info.
What about a cam for the 98 SOHC 16 valve engine?
I will make another 47 mm throttle body for it. Same size as what SuzukiRD sells.
What cam would you recommend for the 98 SOHC?
What is your recommendation for exhaust size with one of your cams?


Seriously?


suprf1y wrote:
Sticky at the top of this very forum

http://www.teamswift.net/viewtopic.php?f=30&t=48005


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PostPosted: Sat Jun 13, 2015 4:21 am 
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From one of the inks in the first post of that thread. Install it in the stock position.

Quote:
These motors, being small displacemt, and 16V are very duration sensitive, and the stock cam is very mild.
Stock duration is 184 degrees at .050"
This is actually milder than both my econo cam, and the xfi cam.
Stock lift is .300" intake, and .280 exh.

The new cam has .340" lift, 192int/198exh duration
Thats a 8 degree gain on the intake and a 14 degree gain on the exh.
The exh. duration, and extra .060"(!!) lift gain will help offset the stock manifold.

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