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93dakman
Dodge Dakota
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5/28/2003
13:28:20
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 Subject: LARGER BORE=BIG POWER
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The chrysler 340 is the 318 with larger pistons. Right? The 3.9L is the 318 with two less pistons. Right? So if you can bore out a 318 to fit 340 pistons, then you can bore out our 3.9L to fit 340 pistons. That would make our Daks 4.26L. Plus, there are more piston manufacturers that make pistons for the 340. I think this is a great idea.
P.S...............BORE......STROKE
........3.9L.......3.91".......3.312"
.........318.......3.91".......3.312"
.........340.......4.07".......3.312"
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gg
Dodge Dakota
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5/28/2003
14:15:30
| RE: LARGER BORE=BIG POWER
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i dont think the 3.9 can be bored more than .060 that would be pushing it . maybe .040 max with sonic test
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FazDak
GenII
5/28/2003
17:00:22
| RE: LARGER BORE=BIG POWER
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Stock 340 has a 4.04 bore, taking aq 318 (3.91) to stock 340 bore would be boring it (bare with me I suk at math) .13.... If that is correct I dont know of any production block that has ever been able to be over bored that much.
To top it all off I understand (from reliable sources) that a Mag block shouldnt be taken more than .002 over.
Now you can play with the stroke all you want, someone was workin on a stroker crank kit for the 3.9, it was a 4" stroke to give it 4.7 but I never heard anything more about it.
Good try though.
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FazDak
GenII
5/28/2003
17:03:23
| RE: LARGER BORE=BIG POWER
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Message:
Oops..........".002 over"...I meant to say .02
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IntenseDak39
*GenIII*
5/28/2003
20:42:55
| RE: LARGER BORE=BIG POWER
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Message:
i was gonna say... .002?!?!?!
most rebuilders will bore up to .06 before its a paper weight. The old 225 slant could bore up to .1 easily.
1998 Regular Cab V6 Auto
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J and J Auto
Dodge Dakota
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5/28/2003
22:00:17
| RE: LARGER BORE=BIG POWER
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I have my 3.9 stroked and it worked out very well
but was also very expensive.
You need differant crank pistons and rods and
also had to grind some material out to clear the
crank, and get the assembaly ballanced
but its done and working great.
More low end torque and top end power.
More power everywhere
Larry
J&J Auto
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93dakman
Dodge Dakota
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5/29/2003
17:06:36
| RE: LARGER BORE=BIG POWER
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Oh, well I just try to come up with ideas to see what you all think of them. Im only 16. I just have some crazy ideas sometimes.
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FazDak
GenII
5/30/2003
12:01:49
| RE: LARGER BORE=BIG POWER
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You know what they say............the only bad question is the one not asked.
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93dakman
Dodge Dakota
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5/30/2003
13:47:03
| RE: LARGER BORE=BIG POWER
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haha, yeah well, thanks for helping me before a went to rebuild and F'ed up my truck.
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