6 bolt Pistons

[FastEddyTheBug]

Ive read that stock 1g 4g63t 6bolts and 7 bolts have a 7:1 comp ratio and 2g-8:1 to increase your comp ratio takes machining of the rods, im not looking to machine my rods from my 6 bolt , ide like to simply just put new pistons and rings on my stock rods. The problem i am having is deciding on the proper pistons to purchase so i can do so. These are the current Pistons i am interested in. Im not trying to hit crazy Hp yet im just trying to achieve at leaste 350hp cause im tired of the 420a , she deserves to be a GS-T http://www.ebay.com/itm/89-92-Eagle-Talon-Turbo-2-0L-4G63T-Pistons-with-Rings-/270553440841

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[BogusSVO]

So you have a 420A under the hood now?

You want to swap to a 4g63.

You may be putting the horse in front of the cart at this point, trying to decide on pistons before seeing what will be involved to get the 4g63 in place of the 420A.

Also you will find most will suggest that if you want a OE cast piston, to stay with the NPR brand.

 

[edged1g]

Ive read that stock 1g 4g63t 6bolts and 7 bolts have a 7:1 comp ratio and 2g-8:1 to increase your comp ratio takes machining of the rods

You need to keep reading... A LOT.

1G compression ratio is 7.8:1. 2G is 8.5:1.

Machining your rods(as shown in your pic) will not change your compression ratio.

And as Bogus said, you are not going to want to try to put a 4g63 into your 420A car once you see whats involved.

 

[FastEddyTheBug]

i understand that buying pistons and engine goodies before seeing if the engine will fit (should fit) , IS IT that much of an overhaul to swap from 420a to 4g63 , i just think the gains are increadibly worth it. I know alot of people say its difficult and not worth it , my car was half a grand(dont think its a junker ) and the engine was a quarter of that. I understand you probably have to do alot of custom fabrication (mounts for sure) and modifications to the drive (not going AWD YET). I just simply think it can be done.


The reason i posted about pistons is because the 4g63t i pulled apart has seen some miles and i think before it ever gets to run again that new pistons are to be installed. On this portion i guess ill machine anyways thank you.

Ive seen and read plenty of posts like mine, saying 420a to 4g63t is no good but my car is not my daily , i have family fabricators and painters and i dont intend on fully enjoying my 1996 eclipse till it has a 4g63 in it thats how those cars where ment to be enjoyed.

 

[BogusSVO]

Can it be done? Simply put.. Yes, it can be.

But nothing under hood will work with the 4g, so engine, trans, axles, maybe even front hubs, wire harness and ECU will all come out and be replaced, you may need to swap out the engine cradle.

The 420A has the timing belt on the passenger side and trans on the driver side.
The 4g set up is flipped the other way.

As long as you understand what you are up against, and have the money, parts and resources to pull it off, go for it.

This swap has been discussed since the start of the forum, and beat to death even.

In my time here, I have not heard of it being done even once.

Honestly your 96 would have to be super clean, and I would guess a $10k budget set to even think to attempt it.

 

[edged1g]

Honestly your 96 would have to be super clean, and I would guess a $10k budget set to even think to attempt it.

And after all that time and work fabricating and painting and innovating to get the engines swapped, you are going to be using eBay cast shitty no-name pistons and machined stock rods? It just makes no sense.

Get some real forged rods and some real forged pistons at the compression ratio you want. My Choice for pistons.

Come back to this thread with some pictures of the progress you are making with the swap and you will continue to get help. Sorry if this is rough but until then, this will just be another dead 420A->4G63 swap thread.

 

[FastEddyTheBug]

good points , ill have to sit this down and think it over some more, its not a ( its happending tmrw thing) its a thought, on that thank you for your info

 

[pauleyman]

It is a plain fact there is absolutely no reason to even attempt a swap as a gst will always be less expensive to just buy. It is likely cheaper to buy a gst and keep your 420a than to attempt a swap.

 

[FastEddyTheBug]

probably what im going to have to do , cause i dont like the 420a platform and its not built for boost, so ill have toss the 4g63t 6bolt block and head guess ill just sell it here or craiglist.

 

[edged1g]

probably what im going to have to do , cause i dont like the 420a platform and its not built for boost, so ill have toss the 4g63t 6bolt block and head guess ill just sell it here or craiglist.

No need to toss it. Continue researching and learning and build that motor up. It will drop into any 4g63 DSM.

 

[BogusSVO]

Run the 420A as a DD keep it about stock, get to work, school.

Now find a DSM roller, build the 6 bolt and build your toy.

 

[FastEddyTheBug]

ahaha alot of people dont get my sense of humor , tossing it "meaning toss the idea" sounds like a great idea ill start looking for a roller. ill just go head and Re-install the Oem pistons and Rods and keep the motor toghather.

never thought to try to buy another eclispe/talon. now you got me thinking

 

[breaksdaily]

As stated, 1G = 7.8:1, 2G = 8.5:1 CR

 

[FastEddyTheBug]

So New build idea for that 6 bolt 4g63t motor sense my last one wasnt taken to seriously

http://realstreetperformance.com/Pr...Rods-4G63T-6-Bolt-7-Bolt-Pistons-Eclipse.html

http://realstreetperformance.com/Sh...o-Pistons-Mitsubishi-Eclipse-4G63-7-Bolt.html

How much more would the crank be able to take ?? Hp wise? Would this Require new crank??

I like things planned out.

 

[pauleyman]

You are still putting the cart before the horse. Youre planning a motor for a car that doesn't exist yet. You stated you want 350hp. You dont need anything other than what you already have for that. On those links I see no reason forca hybrid rod when you can get a standard rod and any piston you want. You have no goals or plan here. Maybe this would help.

http://www.dsmtuners.com/threads/project-management-and-building-a-dsm.421705/

 

[FastEddyTheBug]

It is helpfull im done with this post thank you.

 

[BogusSVO]

The stock crank has gone 800 hp +

What Pauley is trying to get you to see and do is figure out the end use of the engine and car, then you will be better off obtaining your goal.

The build for a drag car differs from an Auto x build that differs from a road racer.

Also the build on a FWD car can differ from a AWD

So basicly look thu the build forms, figure out where you want to go, stack cash, find your roller, stack more cash, then start planning your engine and car build.