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Auto GSX 2.3L with Genesis Coupe 2.0T Pistons

DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
All Over is bolt on?
Not only the compression height. Also need to machine the small end of rods for the pistons, like 2G pistons on 6 bolt rods. And use a thicker head gasket to lower the compression ratio and to have a sufficient piston to valve clearance. The compression ratio goes around 11.6 if use the standard .051" cometic head gasket. I set to 10.5:1.

This project was just from my curiosity and not to use forged parts was like a brake for myself not to raise the boost. Of course, to use ready-made forged parts is much easier but was not my purpose.

Eres Hiroshi?
Yes, I am. Excuse me, have we met before?
 
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DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
How much That pistons cost?, they see Good to a 2.4 piston alternative With some Over size, wich size are these 86 or 86.5?
I used a DNJ Engine Components piston kit, costs around $220 with OEM piston rings. So quality is good. You can find cheaper one on eBay about a half price. But I did not use them because I was not sure about the quality. Some Honda pistons also can be used but they are not designed for turbo engine, so I chose Genesis 2.0T pistons. Since the pistons and the rings are designed for turbo engine. The piston size is 86.00mm. And this piston can not be used for 2.4L because this piston's compression height is lower than 2.4L (4G64) piston's compression height.

También soy de México por eso te preguntaba
Ahhh OK so probably we know each other in local or facebook. PM me please!
 

DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
I was told by a honda guy that all honda engines use forged internals factory, is there any truth to this or is it specific engines or something? I actually have no idea as I don't mess with hondas.
For this project, the piston's specs needed to be 85.00-86.00mm and 22mm wrist pin and the compression height 1.13" or a little bit higher than 1.13" to machine down. Honda's F22 pistons have the numbers very close. So I checked F22 pistons but they were cast. I am not sure about all Honda's pistons though.
 

arrowhead

10+ Year Contributor
923
60
Apr 19, 2011
miami, Florida
Good find.
So what is the comp height 1.13? with 22mm pin diameter, do you know the stock dome height.
This looks like a good option for an n/a motor.


Mandy
 

DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
Good find.
So what is the comp height 1.13? with 22mm pin diameter, do you know the stock dome height.
The comp height of 2.3L (4g63 block + 150mm rod +100mm crank) is 1.13". The Genesis coupe 2.0T pistons have approximately 1.17" height (I used a cheap digital vernier caliper, so not super exactly). So the pistons need to be machined down about 1mm / .040".
The genesis pistons are almost flat top, have approx -2cc~-2.5cc dish (the depth of dish is 0.65mm). After machine down 1mm, the pistons would have 7.9mm thickness (the stock thickness 8.25mm minus 0.35mm) in the center of piston.
About the rods, I used 7 bolt rods since it is easier to find a 7 bolt 100mm crank than 6 bolt one. Just machine the small end width. I shaved 2mm each side, so the total would be 4mm.

Piston weight Before.jpg


Piston weight After.jpg


th_Rod Milling Small end.jpg


Piston Top.jpg


Pistons Rods.jpg
 
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DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
This looks like a good option for an n/a motor.
Yeah, actually I was planning this for a non turbo 2.3 stroker but since this car is my daily drive, I couldn't wait to prepare all necessary parts. So I decided to go for turbo setup with lowering the compression ratio.
If you have a way to machine the pistons and rods, would be cheaper than buying a high compression forged piston kit.
 
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DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
So this car is running?
Yes of course Tony, it has been running for 6+ years since I built this engine. This 2g and a 1.7L Civic is my daily car. In this year mainly I am using the civic since gasoline got expensive. But I recently am motivated to drive the 2g more, so just for in case I am replacing the timing belts and pulleys as regular maintenance before restart to drive this 2g more often.
How do you like the set up and how in the world did you figure this out?
Fun to drive, the 16g spool like a 14b in a 2.3L. It was just out of curiosity. I wanted to see myself how it would work this setup, so I built it.
DSC_4295.JPG
 

1990TSIAWDTALON

Moderator
9,694
5,535
Nov 14, 2013
Independence, Kansas
It sure looks nice Hiroshi!
 

DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
I didn’t see the dates of the post 🤦🏻‍♂️😂
I posted this here in 2017 but this was done in 2016.
When I bought this 2g it had a 6 bolt 2.0 but I destroyed it 3 times by playing with nitrous hahah. Then decided to make it as a fun-to-drive daily car. That's why I used the stock rods as to curb my desires. Otherwise I would keep modifying the car 😆
I was also curious about building a 2.3 without aftermarket forged parts and how 10.5 compression ratio on 91 pump gas would actually work.
13268426_597899517036960_7908295787790467106_o.jpg
 

DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
Switched with FD rims and did a compression test, 215 psi to 230 psi on all cylinders. And the alternator just died:ohdamn: I knew it was gonna stop working soon since the voltage was dropping little by little when it gets hot. Finally it stopped charging today.
311336892_10225805851507259_6478301249620766472_n.jpg
 

Mech Addict

Supporting Member
1,104
511
Jun 9, 2019
Jackson, Wyoming
Cool idea and slick execution. Are you running a stock piston to wall clearance, and how would that compare to a forged piston?
I use my car for dd, and not planning to increase power much above stock. I would sooner try to improve the low rpm torque and throttle response over more top end. Hadn’t considered it seriously because it seemed like forged pistons were the only option for stroker. My impression is that forged have to be set looser in the bores, and consequently not great longevity. I live in a pretty cold climate, and have concerns that would only exaggerate the drawbacks of forged slugs.
 

DSMPT

DSM Wiseman
2,178
1,762
Jun 12, 2014
Japan / Mexico, Arizona
Are you running a stock piston to wall clearance
A little bit looser than the stock PTW clearance. Where I live is pretty hot, one of the hottest city in the world, so I always prefer loose side but it's still much tighter than common 2618 forged piston's clearance.
I would sooner try to improve the low rpm torque and throttle response over more top end. Hadn’t considered it seriously because it seemed like forged pistons were the only option for stroker. My impression is that forged have to be set looser in the bores, and consequently not great longevity.
You also have an option to go with 4032 forged pistons that would allow you to have much tighter clearance than 2618 pistons.
I use my car for dd, and not planning to increase power much above stock
That's my plan on this 2g. I care more about low/mid torque than top end power. I even barely do WOT on this 2g.
 
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