2g pistons or evo 9 pistons

[sharky559]

ive been doing some reserch on evo 9 pistons on 7 bolt rods and i really got confussed. people are saying to stay with 2g pistons an d some say to upgrade to evo pistons. could some one help with this.

 

[Strm Trpr]

OK THEN? The 2 blocks are identical in height, stroke is the same, rod length is the same, the pistons will sit below the deck in an EVO, as well, therefore the thinner head gasket and smaller combustion chambers is what is enabling 8.8:1.

And smaller dish volume on the piston crowns.

 

[ramsack]

Exactly. Are there any thinner than stock head gaskets (not MLS), or can the Evo gasket be used?

 

[Strm Trpr]

HKS makes a 1.0mm thk head gasket.
It is .040" thk.

Did you know that 96-98 Hyundai Sonata 2.0L uses a DOHC head that is exactly like 2g heads, except they have 43cc combustion chambers.

There's a thread on the DSMLink forums.

 

[ramsack]

Thank you, I was tearing my hear out trying to find out where I read about that 43cc 2.0 head. Now just to find a gasket that is composite and the same thickness of the Evo. Maybe the deck height could just be shaved down 0.008" with a stock DSM gasket.

 

[Strm Trpr]

Here's that thread.
ECMTuning User Support Forums

 

[ramsack]

I don't own DSMLink, so I can't view that thread.

 

[NOSLO2PT0]

#2 What rod bearing do you go with if you use and EVO Rod/Piston combo?

You use whatever 7bolt bearings you want to use. 1G 7bolt or 2g bearings are all the same.

HKS makes a 1.0mm thk head gasket.
It is .040" thk.

Did you know that 96-98 Hyundai Sonata 2.0L uses a DOHC head that is exactly like 2g heads, except they have 43cc combustion chambers.

There's a thread on the DSMLink forums.

Shhh.....don't the cat out of the bag on that little secret

 

[gixrman]

#1 Whats modifications did you do to the gasket to make it work? that seems a bit extreme, cant you just buy a thinner gasket?

#2 What rod bearing do you go with if you use and EVO Rod/Piston combo?

In my link it has the box with the part # on it.

 

[VETTE_50_TH]

Ramsack ftl again. Just stay out of threads dude.

Also if you look at the thread from page one i put up, it has a picture showing exactly the difference.

 

[crazyboy81]

The hyuandia Sonata and Elantra DOHC 2.0 is a 4G63. Its just called sometihng else. Its the exact same motor.

 

[ramsack]

Hey, douchebag, if you want to be a moderator, then apply to do so, until then, shut up and I can be in any thread I want. Also, what is your point? I'm agreeing with most people that the lower piston height has nothing to do with why you can't just slap these in a DSM and make 8.8:1. Good luck to those thinking they can make 8.8:1 with a 0.043" head gasket and a 47cc DSM head.

 

[92EagleAWD]

Ill re-ask this question.
How much can be shaved off the stock, lets say 1g 6bolt, head without causing a problem with valve clearence?

Also, someone else asked about milling the block, but i prob wouldnt go that route.

 

[ramsack]

One would have to find out for themselves with some clay on top of their Evo pistons to find out how much clearance there is. The valve reliefs are also bound to be slightly different between setups too.

 

[CFeclipse]

Exactly. Are there any thinner than stock head gaskets (not MLS), or can the Evo gasket be used?

yes i used it...

 

[Strm Trpr]

yes i used it...

So, you're saying you used a USDM Evo head gasket on your dsm?
What did you have to modify?
There are two different HG's for Evo's.
I'd assume it's due to the IX's having MIVEC.

What's the word?

 

[crazyboy81]

Ill re-ask this question.
How much can be shaved off the stock, lets say 1g 6bolt, head without causing a problem with valve clearence?

Also, someone else asked about milling the block, but i prob wouldnt go that route.

What's wrong with milling the block?

 

[97SPYDER210]

I know I had the head flatten out and used a thicker head gasket. And after the head was flatten The piston still did not come all the way to the top. I was ok with this because the relief cuts in the piston are backwards.

http://www.dsmtuners.com/gallery/files/9/2/7/8/1/photo.jpg

 

[Boomdeeze]

So is there anyone with EVO 9 pistons in a 6 bolt that would be willing to post some compression numbers? My car wont be complete for a few months or I would volunteer to be the guinea pig.

 

[fourgsixthree33]

I am using Evo 9 pistons and rods in my 1G 7 bolt. So far after a godly amount of searching, there isn't much I have to do to run this setup. I will be running an oem DSM 1G 7 bolt gasket, buying new rings DSM Graveyard - Your #1 Source for DSM Parts! and new bearings http://www.thedsmgraveyard.com/product_p/pfm77%20cb-1643p.htm.

Anything else you would recommend?

 

[Deuce_three]

Hehe, hi again ^ jus remember to hone the cylinder walls so that the new rings can be seated.

Good luck with the build.

 

[fourgsixthree33]

Lol. Hello.

What main bearings should I get?

 

[NOSLO2PT0]

Standard 7bolt main bearings for a 1G.

 

[fourgsixthree33]

Alright. Was not sure if I needed to get Evo main bearings or not. But since I am using the 1G 7 bolt crank, that would make sense to just get 1G 7 bolt main bearings.

 

[Boostinsideways]

The evo pistons indeed produce an 8.8:1 CR when used in an evo block with an evo head.

In a 2g It is believed they are very close to stock CR when used with a stack deck height block.

The evo pistons are have coated skirts and forged heads. They are a significant budget upgrade. Just about the best pistons you can get for your money as long as you are picking them up from evo owners that are going to a fully forged setup.

 

[fourgsixthree33]

Yep, I got a great deal on these.