Need Engine block please help....
Originally Posted by 94AWDcoupe
Its a shame that many professionals would tell you that the damage occurred from low quality fuel. Which lead to excessive detonation. Simply a poor diagnosis.
I have seen dozens of 4g63s with detonation damage. What you have pictured there is not detonation damage. When you get severe detonation in one cylinder the other three will be close behind. All four cylinders are getting nearly the same air fuel. The distribution of airflow through the manifold is not perfect and the number two cylinder recieves the most air. Since all the injectors fire from the same ecu signals it means number two will run a bit leaner than the other three. When a motor that has been run lean is disassembled its always number two that shows the most piston damage. I see this pattern over and over again.
There is no way the motor here suffered from poor fuel quality. if it did the other three pistons would be showing some damage as well. There is a difference between detonation and preignition damage. Preignition damage is much quicker and much hotter and results in burned piston as you see here. Detonation damage slowly eats the pistons. Look at the rod bearings I bet they look great. If they suffered detonation damage they will look like a washboard. Little ridges form on the surface. looks kinda like a dirt road does after it gets ripples in it.
I have seen dozens of 4g63s with detonation damage. What you have pictured there is not detonation damage. When you get severe detonation in one cylinder the other three will be close behind. All four cylinders are getting nearly the same air fuel. The distribution of airflow through the manifold is not perfect and the number two cylinder recieves the most air. Since all the injectors fire from the same ecu signals it means number two will run a bit leaner than the other three. When a motor that has been run lean is disassembled its always number two that shows the most piston damage. I see this pattern over and over again.
There is no way the motor here suffered from poor fuel quality. if it did the other three pistons would be showing some damage as well. There is a difference between detonation and preignition damage. Preignition damage is much quicker and much hotter and results in burned piston as you see here. Detonation damage slowly eats the pistons. Look at the rod bearings I bet they look great. If they suffered detonation damage they will look like a washboard. Little ridges form on the surface. looks kinda like a dirt road does after it gets ripples in it.
Anything could have caused the preignition in the cylinder, most likely carbon deposit. Notice the preignition took place right by the intake valve.
Would it have happened with 94? Hard to say but it was definitely only a matter of time on 87 with the boost at 22 PSI on a remapped ECU.
Originally Posted by 94AWDcoupe
Detonation damage always occurs on cylinder number two first befor ethe others. More proof the gas quality had nothing to do with this.
Originally Posted by trinydex
i think you should get a galant block. 2.4 liters... roadrace builds them... they're way cheaper than a evo viii motor but are basically the same thing. you'll need new mounts and a they'll mod some stuff to fit the head... but it's been done... they're solid.
or you could bore out your blown engine a lot and get it sleeved.
or you could bore out your blown engine a lot and get it sleeved.
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Originally Posted by Lancerlover
Don't get the galant 2.4 Liter, i know you said you are sticking with the 2 liter, but just incase you have second thoughts, do not go with the galant 2.4 liter mivec motor. The problem is, its a SOHC motor, you wont be able to squeeze out as much power after modifying it compared to a stock evo block. BTW, I read somewhere on Evom that the 4g63 motors are worth $12000...i think it was in the forums with the 601awhp evo. The 4g63 has been proven reliable under superior boost conditions and it has DOHC for more power. DOHC is usually a good set up for a high revving, high compression, and lots of boost. But then again, Road Race motorsports builds good blocks...but I say stay with the 4g63. Its known world wide for a reason. Powered.
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