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Mitsubishi V6 engines Discussion area for the 3.0 turbo and non-turbo

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Old 12-13-2012, 05:17 PM   #1
3.0 Build time  
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Alright guys, I will soon have my spare motor in my garage and ready to be built.

I would like to pull 250-300 all motor if it's possible.
I'm planning on having the heads done (possibly ed) for starters.
I know I'll probably need pistons, bump the compression.
I'll get the cams done (crower).
I'll be making a custom plenum, potentially like knightmoves.

Just my idea for a start, I know I'll also need more fuel, and probably MS to get there.

Not sure where to get pistons.
Any other ideas to get to that number would be great, and where to get parts.
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Old 12-13-2012, 05:23 PM   #2
Re: 3.0 Build time  
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look in the performance thread there is a link to rock auto for 10:1 pistons from a 95 Mitsubishi diamante
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Old 12-13-2012, 05:30 PM   #3
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look in the performance thread there is a link to rock auto for 10:1 pistons from a 95 Mitsubishi diamante
I have a set laying around somewhere......
I was hoping to get higher, unless I can make my goal on those.
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Old 12-13-2012, 05:39 PM   #4
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I have a set laying around somewhere......
I was hoping to get higher, unless I can make my goal on those.
there are 2 ways to bump it up more. one is to have custom pistons made. I know they make a 12:1 for the 24 valve head but not for the 12 valve. the other is to use the 10:1's and then shave the heads down a few thousandths to help the compression. I hear you can cut up to .020 off the heads. BUT!!!! if you cut to much off you could run into sloppy timing belt issues!
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Old 12-13-2012, 05:47 PM   #5
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there are 2 ways to bump it up more. one is to have custom pistons made. I know they make a 12:1 for the 24 valve head but not for the 12 valve. the other is to use the 10:1's and then shave the heads down a few thousandths to help the compression. I hear you can cut up to .020 off the heads. BUT!!!! if you cut to much off you could run into sloppy timing belt issues!
I have heard the same and plan on doing that as well.
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Old 12-13-2012, 05:57 PM   #6
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remember that when you shave heads on a v6/v8/v10 ect. the intake ports move down but they also move closer together, you may need to have the lower intake manifold shaved to fit, that was a problem on old v8s, i would assume the same principal applies to a v6. and btw if you have to have custom pistons made you might as well go really high compression lol

oh yea, to get that high of horsepower you will need magasquart to raise the rev limiter, also a stronger valvetrain to take the abuse of the higher rpm, idk what valve springs are available for our engines but i would look into it. horsepower is a game of rpm.
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Old 12-13-2012, 07:26 PM   #7
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I would like to pull 250-300 all motor if it's possible.
I'm planning on having the heads done (possibly ed) for starters.
If you want 250+ hp all motor, you will likely need much more aggressive cam and plus sized valves.

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Old 12-13-2012, 07:52 PM   #8
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Theres no probably mega squirt too it... you'll need that for sure, especially N/A. Only way you're getting these kind of numbers without stand alone is Boosting it my method. I'd love to see an N/A 3.0 hit those numbers! would be one hell of a ride... i know the boosted 3.0 is ;)
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Old 12-13-2012, 09:01 PM   #9
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You'll need to build the engine for RPM. I think that mostly comes down to cam, valvesprings, and intake tract design, but obviously everything else plays into it as well. I just think those are the main areas where you take a motor that is safe at 7000 and make it safe and productive at 8000. Luckily there are numerous high rpm dohc 3.0s out there so you can learn everything you need to know about the bottom end from that. There are a few sohc 12v 3.0 guys who have revved to 7500 without breaking anything so taking a look at their valvetrain will be a good start.
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Old 12-13-2012, 09:47 PM   #10
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Good luck man, but an N/A 3.0L is going to need a lot more than cams and planum modifying to make even 200 :/. I'll keep an eye on the thread! Maybe you can pull it off.
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Old 12-14-2012, 07:22 AM   #11
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250+ all motor? I'm having custom 10:1 forged pistons made right now, heads shaved and ported, big cams, etc etc and I don't think I'll be anywhere near that. You're gonna need "everything" to make that happen. I think it would be very tough to do on pump gas and stock ecu if that's your goals. If your not ready to go full stand alone, shel-game can move your rev limiter/speed limiter for around $125.

Also take a look at oil control, if you end up revving around 8K I think it would be a big help, I made a thread here a few weeks ago about crank scrapers/windage tray.

If you are serious, you wanna get all the custom parts in your hand asap, I'm stuck in limbo right now waiting for adjustable cam gears, forged pistons and machine shop work. My motor has been completely dissassembled for a full month already.
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Old 12-14-2012, 08:54 AM   #12
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250+ all motor? I'm having custom 10:1 forged pistons made right now, heads shaved and ported, big cams, etc etc and I don't think I'll be anywhere near that. You're gonna need "everything" to make that happen. I think it would be very tough to do on pump gas and stock ecu if that's your goals. If your not ready to go full stand alone, shel-game can move your rev limiter/speed limiter for around $125.
Can I ask y you didn't have higher compression pistons made?
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Old 12-14-2012, 05:44 PM   #13
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Can I ask y you didn't have higher compression pistons made?
I don't wanna clutter this thread up too much. I should have actual compression of about 10.5:1 after decking the block, installing my shaved heads and using a flat top piston (with small valve reliefs). On top of that I intend to run around a 100hp shot of nitrous, all on pump gas and stock cal on a 7k rev limit ecu.
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Old 12-15-2012, 12:36 PM   #14
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I already planned on running MS, along with a lot more fuel.
I have the luxury of an "extra" motor in my garage so my car doesn't have to be laid up. I am planning on getting the MS and getting it on before the motor is done so I can familiarize myself with it.
High compression, heavy cams/valvetrain, intake, fuel, rpms are all on my list so far.

I always love high-revving motors with a wicked powerband, so I want to make a 3.0 like that.
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