Need to replace motor... Whats the best for off-road torque

hodges81 · May 11, 2014

I have a '06 h3 and need to replace motor... I was just going to replace i5 and add a supercharger but they're not available. What is the best motor w/ good power for off-road. I'm in west virginia and there's a lot of mountains and mud. Need something that will eat through it. I'm also upgrading to 37'' Tires with my 4'' lift and I know the bigger tire size changes your diff ratio to a higher gear.

http://www.grimmjeeper.com/regearing_basics.html

Thanks in advance

deserth3 · May 11, 2014

What makes you think your current motor is bad. And how many miles do you have?

hodges81 · May 11, 2014

I just hit 99k and my compression is bad yet no check engine light. There is also no power and only 8mpg with 33'' tires.... I dont have to replace now but I want to ... I'm thinking about a 6.0 liter it has 325 hp and 365 ft-lbs torque. Which I think would be plenty and so much better than the stock set up. I have no clue what GM Engineers were thinking.

hodges81 · May 11, 2014

Will the 6.0 bolt up to the stock bell housing?

06 H3 · May 11, 2014

That's pretty bad...well how much money do plan to spend and who will do the work?

hodges81 · May 11, 2014

I will be doing the work and RPM MOTORSPORTS will have to tune it. Trying to save as much $$$$ as possible.

hodges81 · May 11, 2014

I'd like to rebuild the motor but it just doesn't have enough power...

06 H3 · May 11, 2014

I have enquired about a harrop supercharger but the US rep from OTTP took forever to respond and he quoted me 5k JUST for the blower, nothing else. That is ridiculous, 5k should be the cost for the entire kit (injectors, intercooler, etc.)

http://www.pirate4x4.com/forum/moto...-3l-6-0l-turnkey-engines-starting-1995-a.html

I can buy a 5.3 for cheaper then just the blower....

I wonder why your motor quit so early. I have 124k and I get 12-13mpg with 35s, roof rack, lifted, winch, skids, etc. I still feel the motor has tons of life left I just need some TLC on it. DesertH3 has 170k and Casey had 260k before his quit and he put a 4bt in it...

poweraidon · May 11, 2014

That's gonna be a lot of $$$ a conversion to 6.0 is about 19k plus the lift and tires.

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hodges81 · May 11, 2014

I have no clue... I always used full synthetic oil on everything... front & rear diff, transfer case, engine every 4k miles. I have also replaced all spark plugs and coils. I did take the throttle body off to clean it also and it had a lot of build up oil on it... Not really sure why still trying to figure that out. I also don't have any warning lights on,
:gaah:

hodges81 · May 11, 2014

I already have lift and tires in garage but not installing them until I fix the issue... Also, Mash Motors will do a 6.0L conversion with new transmission, cpu, fluids, wiring harness and install for $18,500.00....

http://www.mashmotorsinc.com/ConversionPricing.html

http://www.mashmotorsinc.com/H3Conversions.html

06 H3 · May 11, 2014

Did this problem start when you got the tune done?

hodges81 · May 11, 2014

No it just started a couple months ago and I have had the tune for about 5 years now.

deserth3 · May 11, 2014

06 was known for bad heads. That could be your problem. Have your computer checked for codes.
The oil in the throttle body I'd from the crankcase ventilation. There is not pcv valve on the H3. There are baffles in the valve cover that see supposed to do the job. They don't.
I just went and got an inline pcv valve and that seems to have solved the problem.

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deserth3 · May 11, 2014

You may just need a new head and valve cover. Allot cheaper than a new engine

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hodges81 · May 11, 2014

Do you think that I should just bore and hone the cylinders and replace piston and rings? Also, I will install an actual pcv valve if I go that route...

amrg · May 11, 2014

hodges81 said:
I already have lift and tires in garage but not installing them until I fix the issue... Also, Mash Motors will do a 6.0L conversion with new transmission, cpu, fluids, wiring harness and install for $18,500.00....

http://www.mashmotorsinc.com/ConversionPricing.html

http://www.mashmotorsinc.com/H3Conversions.html

18500 for the conversion? Wouldnt it be cheaper to repair what you have, sell it and then buy an 09 alpha (stock 5.3L with 300 and 320 torques). Since you still haven't got the lift installed it wld make more sense to wait abit... plus you wont have to worry about install issues and tuning!

hodges81 · May 11, 2014

Valve seat wear can cause a loss of compression that may result in hard starting, hesitation problems, loss of power, rough idle, surging and misfires. These problems may set diagnostic trouble codes (DTCs) such as P0171 or P0174 (lean codes), and/or P0300 random misfire.
GM issued a recall notice 07123A stating GM would extend the factory warranty to cover the cost of any valve seat repairs that may be necessary for up to seven years or 100,000 miles, whichever comes first.So if you encounter a 2004 to 2006 Chevy Colorado or GMC Canyon with any of these codes or driveability issues, and a cylinder leakage test confirms the problem is leaky intake valves, the customer can take their vehicle to any GM dealer to have the cylinder head replaced at no cost.
Dirty fuel injectors can also cause similar drive ability problems on these engines.

http://www.underhoodservice.com/Art...k_at_the_vortec_3500_straightfive_engine.aspx

Wouldn't the H3 be covered also?

deserth3 · May 11, 2014

GM bored out the 3.5 to 3.7 for the 07. And I've been told the computer software didn't change.
There are others here better than me at this. They can help you determine if you just need a new head out a complete rebuild.
From vehicle history. My vote Is you most likely need just a new head.

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hodges81 · May 11, 2014

amrg said:
18500 for the conversion? Wouldnt it be cheaper to repair what you have, sell it and then buy an 09 alpha (stock 5.3L with 300 and 320 torques). Since you still haven't got the lift installed it wld make more sense to wait abit... plus you wont have to worry about install issues and tuning!

I Never was going to use them I was making a point that you could get more for less..

amrg · May 11, 2014

hodges81 said:
I Never was going to use them I was making a point that you could get more for less..

I missed that. Anyway, if it turns out to be a bad head, Ive read that several ppl had GM cover part of the repairs. Im sure others can be more useful here.

RamRod · May 11, 2014

amrg said:
Wouldnt it be cheaper to repair what you have, sell it and then buy an 09 alpha (stock 5.3L with 300 and 320 torques). Since you still haven't got the lift installed it wld make more sense to wait abit... plus you wont have to worry about install issues and tuning!

I think this will be the least head ache!

If I was going to do any conversion to an engine not available else where it would be a diesel swap hands down

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hodges81 · May 11, 2014

I've been looking for an alpha off road but no luck at all

4speedfunk · May 11, 2014

I got a 10.2:1 462 big block sitting in my shop. I bet that would wake things up!

taylorblake831 · May 11, 2014

do a ls1 they have a great power range and you can do so much with it

Need to replace motor... Whats the best for off-road torque

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