Mod Bug Strikes Young Buck 3.2 vs 3.5 - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 9 (permalink) Old 08-15-2011, 08:37 PM Thread Starter
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Mod Bug Strikes Young Buck 3.2 vs 3.5

Okay, so the blown motor in my Intrepid is going to possibly be replaced very soon as my Cadillac may be sold as early as Wednesday this week, so I have questions.... many questions.

1) When replacing the 2.7 with a 3.2 or 3.5, what components need to be changed or modified for the new motor to work? (specifically concerned with electrical)

2) Which motor will offer the best fuel mileage, the 3.2 or 3.5?

3) Scale of 1-10 how difficult is the swap?

4) Where is a good place to find a replacement motor, used?

5) How much is reasonable to pay for a used 3.2 or 3.5?

6) Which motor is more reliable, 3.2 or 3.5?
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post #2 of 9 (permalink) Old 08-15-2011, 08:45 PM
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Welcome to the site:

As far as what needs to be done, step by step:

http://cgi.ebay.com/ebaymotors/ws/eB...T#ht_500wt_975

For your car, you need a 98-01 3.2, or 3.5 engine. Fuel mileage is slightly better on the 3.2, but not by much. 3.5 has a few more horses.

Difficulty is an 8. You need automotive experience, a full compliment of hand (or air) tools, an engine hoist, jack stands, and a safe place to work on the car. If you've never done anything tougher than an air filter or spark plugs I recommend you find someone that has done major engine work to assist you.

Best place for used engines is car-part.com. Make sure they are complete drop outs, with all the accessories (a/c, p/s, starter, alternator, good harness, upper plenum, brackets, etc, also dont tell the junkyard your converting to a 3.2/5, b/c some are jerks and will void your warranty if you do tell). For a complete used engine with low miles and a GOOD warranty, between 1300-1500 for a complete plus shipping and taxes. Add about another $500 for conversion parts, and oil, fluids, clamps, misc stuff.

Both 3.2 and 3.5 are identical, except for the pistons and camshafts. Other than the 3.2 badge you cant tell them apart without tearing into them. Equally reliable.


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post #3 of 9 (permalink) Old 08-15-2011, 09:02 PM Thread Starter
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So I'm looking at a fairly expensive undertaking here? As for difficulty that question was more so for my father's inquiries, as he's the local master mechanic. His only concern was the possible electrical problems with the switch over, but I'll check out the instruction manual you posted on that.
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post #4 of 9 (permalink) Old 08-15-2011, 09:12 PM
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So I'm looking at a fairly expensive undertaking here? As for difficulty that question was more so for my father's inquiries, as he's the local master mechanic. His only concern was the possible electrical problems with the switch over, but I'll check out the instruction manual you posted on that.
You'll have north of $2K in it. Again, thats an engine with low miles and a good warranty, you can go cheaper, but you get what you pay for in that case.

Whether or not to do it is a toss up on a 12 year old car. Depends on how much you like the car. At least you will know what has been done, and that you will have a nice reliable car afterwards, rather than getting a used car that is completely unknown for 4-5K or whatever, and running the risk of a money pit. Also, now is a good time to look at the condition of the rest of the car. After you spend $2K on the engine, are you going to need another $2K in suspension, tires, etc?

No worries on electrical issues. Computer, harnesses, emissions, all stay the same. Your 3.2/5 will plug right into the harnesses that the 2.7 plugged into. You can use the original 2.7 computer, or get a 3.2/5 computer, doesnt really matter either way, the differences are negligible. More expense to install the 3.2/5 computer.


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Last edited by Daytrepper; 08-15-2011 at 09:15 PM.
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post #5 of 9 (permalink) Old 08-15-2011, 10:27 PM Thread Starter
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Essentially, unless parts have rotted and fallen off, I could spend the money on a motor change and have a car that would pass inspections and be licensed without issue or need of servicing ... Need to put a different right rear door on it, but the damaged one functions just fine so it's not a necessity.

Definitely have to do some thinking as this is going to be costlier than anticipated.
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post #6 of 9 (permalink) Old 08-16-2011, 04:21 AM
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does any one supply reman 3.2/5s engines or does it have to be use. also quick question for daytrepper will the motor mounts need to be changed or will the existing motor mounts work for a drop in 3.2/5
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post #7 of 9 (permalink) Old 08-18-2011, 01:44 PM
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Same motor mounts and you can buy re-man engines from people like Jaspers Engines and Transmissions. That's where I bought my re-man motor.
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post #8 of 9 (permalink) Old 08-18-2011, 01:46 PM
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does any one supply reman 3.2/5s engines or does it have to be use. also quick question for daytrepper will the motor mounts need to be changed or will the existing motor mounts work for a drop in 3.2/5
Reman is fine when swapping a 3.2/3.5 for a 3.2/3.5, but the kicker is getting all the parts you need for the 2.7 swap. It will be expensive and time consuming, whereas a used engine will have all the parts on it already, if they pull it correctly (ie alt, a/c, power steer, starter, harness, plenum, manifolds, etc).

Last edited by Daytrepper; 08-18-2011 at 02:52 PM.
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post #9 of 9 (permalink) Old 08-18-2011, 01:49 PM
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I would just go buy it from a junkyard so you get all of the accessories and such then just tear down the motor and do a simple rebuild if you're up to it. Just replace seals and gaskets. But if you find a low milage motor you shouldn't have to worry.
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