Evo 8/9 Engine Failures
op,
throw 400 to the wheels. then drive it a little while. then make 600. then maybe you can step it up to 700 and see how you like it.
you have no idea what you are getting into trying to make 1000 hp with any motor let alone a 4g63.
if you really want to make big power on a budget, learn to do all the work yourself. you make lots of power on cheap parts, labor is really expensive.
throw 400 to the wheels. then drive it a little while. then make 600. then maybe you can step it up to 700 and see how you like it.
you have no idea what you are getting into trying to make 1000 hp with any motor let alone a 4g63.
if you really want to make big power on a budget, learn to do all the work yourself. you make lots of power on cheap parts, labor is really expensive.
You will never see that much torque.
Rods don't break due to lean conditions, Pistons do.
If you are dead set on an Evo with big power, please have someone build and tune it for you. Then have them explain all the maintenance you will need to do. And what to keep an eye on.
Do you own an Evo now?
How old are you?
Guess I'll do some digging for anyone who upgraded rods and pistons to see if it helped with anything.
Thread Starter
Joined: Jul 2012
Posts: 3,294
Likes: 197
From: California
I have 430 now with stock motor and stock cams. It is really fun to drive. I'm just trying to keep it on the road by being prepared for a bad day since anything can destroy the engine. I went to a reputable shop for a complete timing belt change (with all the misc replacement parts) and trans fluid changes. I'll probably run this setup until next timing belt change. Then what do I do with high mileage motor?
I plan on doing as much as I can on my own because I like doing things myself, unless it is an install best left to professionals where anything can go wrong after the install (like timing belt).
I even think dealers are sloppy. Had them change timing belt on my Outlander for $1600+ and so many things were not put back right (filter box was open, only 1 plastic peg was holding each piece of underside on, etc). No way I went back to them with my evo. Lol
I plan on doing as much as I can on my own because I like doing things myself, unless it is an install best left to professionals where anything can go wrong after the install (like timing belt).
I even think dealers are sloppy. Had them change timing belt on my Outlander for $1600+ and so many things were not put back right (filter box was open, only 1 plastic peg was holding each piece of underside on, etc). No way I went back to them with my evo. Lol
op,
throw 400 to the wheels. then drive it a little while. then make 600. then maybe you can step it up to 700 and see how you like it.
you have no idea what you are getting into trying to make 1000 hp with any motor let alone a 4g63.
if you really want to make big power on a budget, learn to do all the work yourself. you make lots of power on cheap parts, labor is really expensive.
throw 400 to the wheels. then drive it a little while. then make 600. then maybe you can step it up to 700 and see how you like it.
you have no idea what you are getting into trying to make 1000 hp with any motor let alone a 4g63.
if you really want to make big power on a budget, learn to do all the work yourself. you make lots of power on cheap parts, labor is really expensive.
Thread Starter
Joined: Jul 2012
Posts: 3,294
Likes: 197
From: California
Looks like my next round of mods will be to make sure fuel and oil is always adequate. 
The 4G63 is inherently capable of high power. The three things that kill these motors are 1) lack of sufficient fuel, 2) lack of sufficient oil, 3) Too much ignition timing. There are a number of ways for the first two conditions to occur. Here are a few that quickly come to mind:
Lack of fuel
- Insufficient capacity fuel system
- ****ty fuel system setup
- Not taking care of injectors
- Bad tune
Lack of oil
- Oil pan not up to the job
- Not paying attention to oil level
Too much timing obviously means a crappy tune.
Lack of fuel
- Insufficient capacity fuel system
- ****ty fuel system setup
- Not taking care of injectors
- Bad tune
Lack of oil
- Oil pan not up to the job
- Not paying attention to oil level
Too much timing obviously means a crappy tune.
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
Unfortunately, it really doesn't work like that. Detonation from running lean spikes cylinder pressures to many multiples of what happens during normal combustion. And greater heat is produced. Take care of fuel, oil, and ignition timing, and the motor should last if the parts were designed for the target power level. I guess I should mention that engine cooling matters as well, but most people who don't circuit race their Evo kill their motor by one of the items I mentioned.
Thread Starter
Joined: Jul 2012
Posts: 3,294
Likes: 197
From: California
Good thing there's so many experienced people to save me money 
Thanks for all the insights guys!

Thanks for all the insights guys!
Unfortunately, it really doesn't work like that. Detonation from running lean spikes cylinder pressures to many multiples of what happens during normal combustion. And greater heat is produced. Take care of fuel, oil, and ignition timing, and the motor should last if the parts were designed for the target power level. I guess I should mention that engine cooling matters as well, but most people who don't circuit race their Evo kill their motor by one of the items I mentioned.
Thread Starter
Joined: Jul 2012
Posts: 3,294
Likes: 197
From: California
Something to think about when dreaming of a 1000 hp engine.
The iconic American fighter plane of WWII, the P-51 Mustang, was powered by a Packard built British designed Merlin V-1650-9 that produced 1500 hp at 3000 rpm at 16,100 ft, fed by a two stage two speed blower running at 16 psi on 140 octane. This was thought to be the most the engine could withstand if it was to be reliable, bring back the pilot alive and make it to its 400 hour overhaul.
The equivalent power output for the Evo engine based on displacement is 111 hp.
The iconic American fighter plane of WWII, the P-51 Mustang, was powered by a Packard built British designed Merlin V-1650-9 that produced 1500 hp at 3000 rpm at 16,100 ft, fed by a two stage two speed blower running at 16 psi on 140 octane. This was thought to be the most the engine could withstand if it was to be reliable, bring back the pilot alive and make it to its 400 hour overhaul.
The equivalent power output for the Evo engine based on displacement is 111 hp.
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