I did a comp test and as follows: #1 155to #2 152 #3 118 #4 154. I did a wet test on #3 and it came up, so i can assume rings are bad. Do you recomend OEM rings or Hastings rings as they are cheaper.and also while im in there should i replace the bearings for better ones? What about replacing the pistons with evo 9 pistons? All info welcomed

 

Anyone?

 

I would use aftermarket rods and pistons. Pulling the motor and doing a stock rebuild is a bad idea. The rods are super weak. If you are stuck on stock pistons buy the DSM graveyeard 6 bolt rod machined to fit a 7bolt motor. The rods are stronger and you can keep the stock piston. evo9 pistons are the same as evo8. If reringing the engine I would definitely use stock rings. Also make sure to have the hone redone and the bore checked to be the correct size for a stock piston. Check the bores before you buy anything as there could be bore damage and your block may need to be bored to a larger size and stock pistons are a no go.

 

Just drive the car until it starts giving you problems like excessive oil or water consumption or smoking. And when you do rebuild go with after market forged rods and pistons.

my stock engine has 130,000 miles. The first 3 cylinders making 180 psi and number 4 only makes 140psi. If i add oil them number 4 jumps to about 170-180. With a leakdown test my first 3 cylinders leak about 3-5% and number 4 leaks 25-30%

My cars burns no oil and still makes over 400whp on the dyno on straight 91 octane. i still drive it everyday.

 

I recently did a compression and leak down test on my stock Evo 9 MR SE as well.

Here are my compression numbers: 155, 150, 155, 155 looks good so far. My leakdown numbers where at 5 percent, 10 percent, 5 percent, 2 percent...very dissapointed on the number 2 cylinder.

I'll drive my Evo till, I have enough cash for a fully built 2.2L long block from English Racing

 

Anything under 20% is fine. Run it. 30% you have an issue for sure but like riceball said, run it till it don't run anymore. Get your moneys worth.

Start saving $$ now and get some good aftermarket rods and pistons.

 

I thought the 9 pistons were a different material and have a skirt coating. I ask cause dsm graveyard has a combo with evo 9 pistons, rings and graveyard blueprint rods for a decent price. Acl race bearings good?

 

Are the stock IX rods not forged? They must be in order to take all that abuse...and not to talk about boost.

 

First off I'm not ripping you by anyway but that's a bad idea for a few reasons. I know the guys at dsm graveyard and trust me when I say I'd never buy anything from them. Second thing is you can't use 6 bolt rods on a 7 bolt crank being the 2 cranks are different. That is the reason why us dsmers used the 6 bolt rods and 2g pistons being the 1g pistons were way less compression 7.8:1. Most of the time when people built 2g cars they would just do the swap just for that reason. I use to argue with John back in the day when he first started doing it being he use to think that by doing this, it would raise the compression on a dsm to 8.8:1 which isn't the case being the deck heights are different. They offer them still to this date for upgrades for dsm motors.

 

Nothing on the evo came forged stock from Mitsu.

 

Drive it til it blows, or acts real bad, then build it. Stroke it out and make a monster-motor.

 

They are right I wouldn't start in on her until you have problem.

 

Well my problem is my car isn't running correctly. I believe there used to be other parts on the car before it was sold to the lot I bought it from. It doesn't idle correctly, only puts out 13psi. I plan on getting retuned to see if it fixes my problems, so I'd like the motor to be sound

 

Boost leak test, retune, mbc may be bad or non existent, you may be running wastegate pressure or something. First thing about getting a car used or incomplete is get it retuned, and looked over.

 

First of all there are MANY rods for EVO that actually use 1G wider bearings. Your first point is wrong. Then the idea that a DSM and EVO have different deck heights is wrong as well. I had my Graveyard rods checked after purchase and they were fine. I would always check machine work on any custom part. I have built an EVO9 using 1G rods on 9 pistons and it was a great running Car. By putting the EVO piston in a DSM it is in fact an 8.8:1 motor. If you are going to argue with someone at least make sure you aren't completely wrong. Until you learn some more I would suggest you not post in any tech threads.