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 Post subject: Pistons
PostPosted: Wed Oct 01, 2014 5:27 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
Does anyone know if there is a difference in weight between the 1.3L
DOHC and the SOHC pistons?
What are the weights?
Wrist pin hole location differences?
What other pistons will fit?
I am about to change out the SOHC head for a DOHC head.
With this will come an engine rebuild. And I would like to get this right
on the 1st try.
Also who makes the right/best engine overhaul gasket set?

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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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 Post subject: Re: Pistons
PostPosted: Wed Oct 01, 2014 10:12 pm 
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Joined: Tue Jul 01, 2008 9:46 pm
Posts: 804
Location: Great Falls ,Mt.
If you want to do it right the first time why don't you use new dohc pistons ? Check out these guys.
http://www.importperformanceparts.net/i ... zuki1.html
Ken...........


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 Post subject: Re: Pistons
PostPosted: Wed Oct 08, 2014 8:06 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
Thanks for the link.
The reason I am asking is that I was going to transplant a 16 valve twin cam head onto my 97 1.3L sohc engine.
With 175,000 on this engine, I was going to pull it and rebuild it as necessary.
Since My 1st posting I have learned that the GT engines use a forged crankshaft with larger counter weights
to accommodate for the larger connecting rods.
Thus the question, do the GT 1.3L 16 valve pistons weigh more then the 1.3L SOHC pistons.
I was hoping that someone had the two types of pistons and could give me the weight difference.

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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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 Post subject: Re: Pistons
PostPosted: Wed Oct 08, 2014 9:00 am 
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Joined: Thu Jul 20, 2006 7:17 pm
Posts: 1405
Location: Alberta, Canada
I built an engine once using gt rods, pistons,head etc on a 1.3sohc block and crank. I didn't weigh pistons or get technical, but I can say for a fact that balance must have been fairly close. Engine worked very well, didn't shake itself to bits or anything even when run hard lots in a gt. It had 100k on it last I saw the car and was performing well still.

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1995 Swift w/16V 4.39s, 3tech cam, Esteem t-body, Header, needs more.
1995 Gt Mustang "Boss Shinoda" package.
1999 F150 4x4 Supercharged
1967 Mustang 428 auto, never ending expensive project
1993 Civic si h22a, fell in my lap, couldn't resist!


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 Post subject: Re: Pistons
PostPosted: Wed Oct 08, 2014 6:24 pm 
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Joined: Sat Oct 15, 2005 11:43 pm
Posts: 776
Location: Greer,South Carolina USA
I have done the swap you are talking about. guy that owned car just wanted it running again I put a 16v head on a 8valve short block that he brought to me and said just make it work. It is a interference engine now but runs real good. Been running over a year this way.

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 Post subject: Re: Pistons
PostPosted: Fri Mar 06, 2015 7:44 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
The pistons I ordered from a teamswift member out of Florida arrived today.
The are usable Venolia #287 forged, with no collaped skirts, broken ring lands, or detonation on the
pistons. I will have to get a set of rings.
I will be drilling new oil holes for the wrist pins to get oil.
3119 Shows a piston before and after a light glass beading.
Attachment:
IMG_3119.JPG

3110 The center piston is the forged piston. No casting marks on the under side
Left piston is a cast low compression 98 SOHC 16 valve, center is the forged mid compression
16 valve, right is a high compression 92 DOHC 16 valve GT piston.
I need to drill the wrist pin oil holes on the forged piston.
GT wrist pin is the lightest on the right.
Attachment:
IMG_3110.JPG

3109 shows the differences in compression. 98 4 valve on left, GT on the right.
Attachment:
IMG_3109.JPG

3112 shows that the ring lands are Identical with suzuki, the wrist pin height (compression height)
is the same, and the length of the skirts are the same. GT piston on left has more oil holes.
The numbers are the piston weights with wrist pins and without in % of one pound. The forged pistons will be getting
lighter GT wrist pins.
I still need to talk to Venolia to get the bore clearance numbers.
Attachment:
IMG_3112.JPG



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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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 Post subject: Re: Pistons
PostPosted: Fri Mar 06, 2015 1:18 pm 
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Joined: Fri Jan 07, 2005 2:46 pm
Posts: 883
Location: Arizona
That forged piston looks really stout. You planning some huge boost for that engine someday?

I can't wait to see how twin cam will run with single cam engine management...........I'm guessing that will be the first attempt at that combination here at TS


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 Post subject: Re: Pistons
PostPosted: Fri Mar 06, 2015 1:31 pm 
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Joined: Sun Feb 23, 2003 4:16 am
Posts: 8033
Location: Ontario, Canada
I wouldn't expect it to run very well. The SOHC 16 ECU is not very good, and those pistons with a DOHC head will be low compression. Exactly what you DON'T want in that application. That motor wants compression and I would consider 10-1 to be the bare minimum. Just a guess, but that combo of the top of my head looks like about 8.5-1. Good for a turbo application, but if you were doing that, the SOHC ECU wouldn't play well anyway.

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 Post subject: Re: Pistons
PostPosted: Fri Mar 06, 2015 2:26 pm 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
The single cam ECU has a bit switch. setting it to zero locks the programming. Setting it to one allows me to reprogram the ECU.
I can program red line raise, fuel maps, advance curves, and with a wide range O2 sensor power curves and torque curves.
I already am running the Bosch performance injectors 24 pounds per hour, and they work well with the stock fuel maps.
I will be doing this on your street performance cam grind that you offer.

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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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 Post subject: Re: Pistons
PostPosted: Sat Mar 07, 2015 1:47 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
The forged pistons needed better oiling to the wrist pins. I am bringing oil to the wrist pins from the oil control ring slot
area. This modification will actually force oil from the oil control rings into the wrist pin from the top down.
This allows for much better oiling to the wrist pin then just a hole from the bottom which relies on splashed oil to feed the wrist pin area.
The rods show the new oil hole location. Piston on the right is unmodified.
Attachment:
IMG_3124.JPG


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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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 Post subject: Re: Pistons
PostPosted: Sun Mar 08, 2015 4:15 pm 
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Joined: Thu May 12, 2011 10:08 pm
Posts: 625
Location: texas houston
Do you have a turbo mod in mind?


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 Post subject: Re: Pistons
PostPosted: Thu Mar 12, 2015 7:09 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
I have a turbo mod in mind for this engine.
Engine is out being cleaned and bored.
Vinolia is sending me rings and light weight wrist pins to fit
there pistons with GT rods.
Wrist pins for the GT pistons are 0.748(19mm)
Wrist pins for the Vinolia forged pistons are 0.750.
Rods have been sent out to be honed to 0.7505.
I will get it all back next week.
I am still looking for a crankshaft grinder that can grind the crank and
do the radius right. Biggest issue here is the width of there grinding stone is to
large to fit the Suzuki crank shaft.

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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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 Post subject: Re: Pistons
PostPosted: Fri Apr 24, 2015 9:45 pm 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
There are 210 grankshaft grinders in Texas. I finally found one that would grind my crankshaft and do the radius right.
It took 0.010" to clean up the crankshaft. Plastigage of the crank came in at 0.001" to 0.0012"on rod and main bearings.
Engine was bored for forged pistons I got from Aries. HEad work with new guides was done by me.
3250 shows completed engine and transmission with all the 98 ODB2 sensors in place. Transmission is a GT with 4.10, My LSD work to the differential, and the best internal part I could find. I installed as much as I could of the bolt on support items including most of the wiring harness. Now if it will stop raining I will install this new driveline.

Attachment:
IMG_3250.JPG


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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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 Post subject: Re: Pistons
PostPosted: Sat Apr 25, 2015 12:10 am 
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Joined: Sat Oct 15, 2005 11:43 pm
Posts: 776
Location: Greer,South Carolina USA
Looking good!

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 Post subject: Re: Pistons
PostPosted: Sat Apr 25, 2015 1:33 am 
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Joined: Sat May 18, 2013 12:48 am
Posts: 170
Location: San Diego CA
Nice! Keep us updated.


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 Post subject: Re: Pistons
PostPosted: Sat Apr 25, 2015 4:28 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
I have 2 days of no rain this weekend, and no gun shows . Looks like engine swap time.

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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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 Post subject: Re: Pistons
PostPosted: Mon Apr 27, 2015 5:02 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
It runs. Fired up on the first try.
Spend the day doing the detailed finish up work.
I will road test it in the morning
It is starting to rain, I am done for the day.
Attachment:
IMG_3281.JPG


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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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 Post subject: Re: Pistons
PostPosted: Mon Apr 27, 2015 7:06 am 
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Joined: Thu May 12, 2011 10:08 pm
Posts: 625
Location: texas houston
is that the sohc dizzy you are running?


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 Post subject: Re: Pistons
PostPosted: Mon Apr 27, 2015 7:18 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
I used a DOHC dizzy that was in a fire and converted it to the cam sensor needed on the 98 ODB2 PCM.
What you see are the two coil packs that replace the distributor.
Also on the 98 there is no EGR system.
3094 shows the old GT distributor and the GT core distributor modified for the cam sensor.

Attachment:
IMG_3094.JPG


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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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 Post subject: Re: Pistons
PostPosted: Fri May 01, 2015 11:35 pm 
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Joined: Mon Dec 31, 2012 12:58 pm
Posts: 85
Location: Millsap, TX
Is this 16v engine/trans still for sale @ $1,000 plus shipping?







( ducks and runs for cover ) :lol:

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'91 Metro 3 cyl. 'vert. 5 speed beater, built as a fun daily driver.
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 Post subject: Re: Pistons
PostPosted: Sat May 02, 2015 4:25 am 
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Joined: Tue Oct 03, 2006 10:43 pm
Posts: 720
Location: Texas 75150
Not the GT DOHC, but I do have a SOHC 16 valve engine and transmission 3.79 complete with engine wiring harness for sale.

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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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