4G63 NT pistons

[aaron_henderson]

I currently have my motor (NT 4G63 6-bolt) pulled apart and am trying to get it running. I was thinking that while it was apart I'd get some better pistons/rods as I plan to turbo although not for awhile. Would there be anything wrong with running turbo pistons with the same 9:1 compression as the stock NT pistons for awhile until I have the cash to do the turbo setup? What are the recommendations for building to bottom end to handle around the same boost as a stock 4G63T? Would rods be required at stock boost level? My plan is to eventually turn my ES engine/tranny to the TSi AWD setup, but that will be over the course of few years likely. Like I said, I just plan to reach stock 4G63T power. Also, anyone know some descent pistons that won't kill me in price?

 

[beating4g63s]

2g pistons can be found fairly cheap and are a good replacement for your situation and not break the bank, use the stock rods you already have and you'll be set. and I believe you can run them while still being n/t.

 

[aaron_henderson]

2g pistons can be found fairly cheap and are a good replacement for your situation and not break the bank, use the stock rods you already have and you'll be set. and I believe you can run them while still being n/t.

I thought 2G pistons used 22mm wrist pins and the 1G use 21mm? So I wouldn't have to run performance pistons with the same 9:1 as the NT, I could use the stock 8:1 turbo pistons without the turbo setup is what you mean? That will save me large bucks! I guess I'd just have less power with 8:1 compression on the NT motor?

 

[Freerevving]

I've got some forged 9:1 pistons that will work fine for both

they're brand new and I'll sell for less than half of what they cost... they are for 2g, so you would have to get the small end of the rods bored... costs almost $30 to have done

 

[ezz-e]

Its totally double, alot of people are running 9:1 comp. on there turbo motors some even go for 10:1 turbo

 

[lasthope05]

Its totally double, alot of people are running 9:1 comp. on there turbo motors some even go for 10:1 turbo

Yea because they are running e85 and race gas in their motors which I doubt the OP is ever going to do.

 

[Freerevving]

Yea because they are running e85 and race gas in their motors which I doubt the OP is ever going to do.

You can run 9:1 on 91 octane and about 17psi no problem

same goes for 10:1 but 7 psi is probably a safe limit on pump gas

2g's can run a little more because they have less aggressive timing

 

[T is for TURBO]

You guys are getting away from the question at hand.
To the OP: If I were in your shoes, go with the 2g pistons and get the 6bolt rods bored. The 8.5:1 compression ration of the 2g turbo pistons is much closer to the 9:1 NT ones than the 1g turbo pistons wich are 7.8:1, so you will loose less performance while waiting for the turbo application.

Freerevving: 2g's can also run more because the fuel system in a 2g is far superior than the 1g. (better MAS, and higher fuel pressure) although I'm not disagreeing with you as I don't know what the 1g timming is like.

 

[lasthope05]

You can run 9:1 on 91 octane and about 17psi no problem

same goes for 10:1 but 7 psi is probably a safe limit on pump gas

2g's can run a little more because they have less aggressive timing

The point of people who build their engines based on a 9:1/10:1 is so they can make more power easier at higher boost pressures. Find me someone on the board with a 9:1 or higher running less than 20lbs.

It can be done but it limits you on what you can do on pump gas and thats the majority of peoples goals. Making great numbers on pump gas.

 

[Freerevving]

The point of people who build their engines based on a 9:1/10:1 is so they can make more power easier at higher boost pressures. Find me someone on the board with a 9:1 or higher running less than 20lbs.

It can be done but it limits you on what you can do on pump gas and thats the majority of peoples goals. Making great numbers on pump gas.

I've seen quite a few people post on here that have 9:1 and less than 20psi

most running over 20 psi have avoided high compression pistons completely.. Most of the DSM racers running race gas are far below 9:1

 

[aaron_henderson]

You guys are getting away from the question at hand.
To the OP: If I were in your shoes, go with the 2g pistons and get the 6bolt rods bored. The 8.5:1 compression ration of the 2g turbo pistons is much closer to the 9:1 NT ones than the 1g turbo pistons wich are 7.8:1, so you will loose less performance while waiting for the turbo application.

Freerevving: 2g's can also run more because the fuel system in a 2g is far superior than the 1g. (better MAS, and higher fuel pressure) although I'm not disagreeing with you as I don't know what the 1g timming is like.

Thanks, this is the info I was looking for. I was unaware the 2G had 8.5:1 compression. So the rods will still hold up just as well with the wrist pin holes bored out? I am hopeing to get this figured out so I can order the pistons so they are here on Thursday, my day off. Lots and lots of work yet to be done with my "wreck". I saved the car from some random guy who was about to have it towed away 10 minutes before I got to it. I gave him $300 and it was mine, with no idea what was wrong with it. Broken timing belt and some bents valves it turns out. But I'm bringing her back to life, slowly, but surely.