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slydog
GenI
 
2/25/2010
16:20:31
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 Subject: 8.25 rear gear
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i'm putting a 1990 /360/a518 in my 89 dak convert. gonna cam it & carb...think the cog will hold up ????
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Chris G
Dodge Dakota
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3/02/2010
22:16:14
| RE: 8.25 rear gear
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Holy crap, you have a convertible Dakota? Nice. Sure it ain't worth hell in the winter, though, with all the air leaks and whatnot.
Anyway, if you're going to change the cam, why not stroke the engine while you're at it? I mean, increase the stroke, and might as well overbore, too, and have a nice, new, fresh engine that - taken it's done right - will serve another 200k+ miles.
In anycase, if you're just going to keep it a stock 360 (or 365), the 8.25 should hang on with little trouble. It's not like you're putting that engine infront of an A500. The 8.25 is relatively durable.
Although, it might be a good idea to grab a 9.25 (or was it 9.75?) from, say, a '95 Ram from the junkyard, preferably with stock LSD. And then buy lower (numerically higher) gears for it. Or even just keep the 8.25 and freshen it up with lower gears and maybe an LSD. The lower gears alone will make it even more of a pleasure to drive.
Now if you're going to go crazy and make a 408 (4.03" bore x 4" stroke) from that 360, then I'd suggest the bigger rear end.
Just make sure you balance the Torque Converter on that A518 correctly, otherwise not only will your engine thrash about, but you'll annihilate the bearings and whatnot - even for just a little bit of running it.
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The Joe.C
Dodge Dakota
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3/03/2010
16:30:39
| RE: 8.25 rear gear
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Why not a convertible Dakota? Remember the sidewinder?
Also how do you increase the size of you engine block? Is it the bore and sroke you increase?
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The Joe.C
Dodge Dakota
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3/03/2010
16:43:50
| RE: 8.25 rear gear
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Like this right here. Watch this video
http://www.youtube.com/watch?v=HQfh6AZxL08
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Chris G
Dodge Dakota
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3/03/2010
18:36:27
| RE: 8.25 rear gear
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Ah, you don't really increase the size of the block, you increase the displacement - but yea, by the bore and stroke.
And can also overbore your cylinder walls by yourself. I believe they make an adjustable cylinder hone - I think to be powered by a power drill.
The stroke is just a matter of the 'correct' crankshaft.
Usually when you rebuild an engine, even with the same style/stroke crankshaft, you usually tend to at least have to overbore by .01" just because the walls are worn and out-of-round. I've heard stories of people's cylinder walls being so scorne that they HAD to overbore to .03", one time I heard a .04". That's a large jump (.04" I mean), and some blocks can't handle it because of how thin the material gets between the cylinders - ends up in a situation much worse than a blown head gasket between cylinders. Need a new block, then.
But then again, it depends on the exact block, too. I'm pretty sure that the 340/360 is the exact same block, so you can overbore the 360's bore by .06" or even .07" (the 340 bores, stock, were 4.04", so the 'standard' .03" overbore from that would relate to a .07" overbore from the 360's 4.00" bores).
I heard of a couple blocks that even .03" was too much, but I think those were blocks from an import, or something.
If you can find the right pistons, you could also be different and do a .015", .025" overbore. I'm positive that you can do that with the Jeep 242's, as I'm recall someone making a 'square' engine, relating to the bore and stroke being equal, and the stroke is an off x.xx5". I think Dino Savva was his name, has his own Jeep performance website.
Oops, ranting.
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Mark.S
Dodge Dakota
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3/04/2010
12:04:31
| RE: 8.25 rear gear
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Jeep did have a 4.2 I6 back the day, so you could say it was bored and stroked up. The L.A 383 was bored up to 400 cid status. Also take a look at the GM 6.2. Just as 6.0L bored to that specific size.
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Chris G
Dodge Dakota
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3/04/2010
16:40:38
| RE: 8.25 rear gear
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Ah, I knew I was forgetting something. The 4.0L used the 4.2L crank, and bored pistons to match 'new' crank's stroke.
Needless to say, with the properly tuned fuel injectors, those little I6's get some decent power after being stroked.
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Chris G
Dodge Dakota
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3/05/2010
20:09:52
| RE: 8.25 rear gear
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Ugh, that'll probably come off wrong.
I mean the 4.0L that was stroked that I'm talking about used the 4.2L's crank.
The 'new' 4.0L has it's own crank, with less stroke.
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STS
Dodge Dakota
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3/08/2010
18:40:32
|  RE: 8.25 rear gear
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Didn't chrysler make a H.O motor from the 244 I6? I think its was 210 HP if I'm not mistaken. Of course AMC always made motors.
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fotodak
Dodge Dakota
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3/09/2010
20:52:45
| RE: 8.25 rear gear
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NOPE.
340 block has 4 bolt mains and 360 block has shorter skirts for crank clearance.
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STS
Dodge Dakota
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3/13/2010
15:55:30
| RE: 8.25 rear gear
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Not to mention internally balanced.
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