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  #1  
Old 12-05-2012, 02:17 PM
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Default 3.7 rebuild question

Has anyone rebuilt a 3.7? Can you put 6.0 rods in it without replacing the crank?
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Old 12-05-2012, 02:56 PM
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What are 6.0 rods?
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Old 12-05-2012, 05:52 PM
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6 inch rods vs the factory 5.7 inch
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Old 12-06-2012, 03:16 AM
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Highly doubt it, but I can't say for certain because i've never tried it.
First question that comes to mind is where is the piston going to go at TDC? Your pistons and heads will be having an intimate encounter thats not very favorable to continued engine opperation. In an area of the engine where tolerances are tight, adding a few inches wont work very well.
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Old 12-06-2012, 09:28 AM
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Very true, a few inches would be a problem, but .3 inches should be ok, I would think? It's my first rebuild so I am not sure. I'll ask the machine shop when they bore it and do the heads.
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Old 12-06-2012, 09:29 AM
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I'm just curious as to why you would even want to try this. I can't imagine any scenerio where a 3.7 would need longer rods to reduce cylinder wall loading. Come to think of it, where did you even find the rod length specs? Chrysler doesn't publish that in the factory service info.
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Old 12-06-2012, 11:47 AM
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My engine blew 2 nights ago and I need to rebuild. I love dodge, but honestly, the 3.7 in the ram is a joke, works great for the Liberty though. I am looking to gain horsepower while I am having the machine shop polish clean up the block and heads. A few friends of mine build race engines and have suggested longer rods.
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Old 12-06-2012, 01:13 PM
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If your friend builds race engines, he should know that increasing the rod length won't do a thing for horsepower. You may be able to squeeze a few more ponies from your engine but the bottom line is that there just aren't many good performance parts available for this engine.
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Old 12-06-2012, 03:06 PM
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If you are looking for more hp but don't want to get rid of the truck or buy another, swap a 4.7 in. They are the same family. But it's your engine.
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Old 12-07-2012, 03:08 AM
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Quote:
Originally Posted by HemiLonestar View Post
If you are looking for more hp but don't want to get rid of the truck or buy another, swap a 4.7 in. They are the same family. But it's your engine.
This is what I would do!

Talk to your friends a little more, they should know that there is a lot more to stroking a motor than adding longer rods.
You are pushing the piston further up into the quench area and you will need pistons that have valve reliefs so you don't have piston/valve contact. There are a lot of measurments to be taken before throwing in longer rods.
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