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Ky_man
Dodge Dakota
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9/01/2006
00:44:39
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 Subject: Supercharger
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OK, this may be another dumb question by me, but how much
horsepower would a 5.2 magnum gain from a supercharger?
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clint
Dodge Dakota
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9/01/2006
12:04:37
| RE: Supercharger
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i got a question too. i know they have these because i drove a dak with one. but how obut a conbentional super charger. the blower stickin out of the hood type. the ones that eliminate the intake. i want one of those but were the heck can i find one. and what are the disadvantages and advantages
by the way i already searched google!!
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gen1dak
Dodge Dakota
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9/01/2006
13:04:42
| RE: Supercharger
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On average, 30-50% increase. The big advantage is the instant power which comes from gobs of low rpm torque, and the broad, flat power curve that follows. Individual applications will have different results due to their static compression ratios vs how much boost they can run. Power can also be affected by heat from the process. Running too large of a supercharger is a waste of power, but too small a unit running at max capacity will generate more heat which will reduce max possible power output. There are a couple types of supercharger intercoolers that help counter the heat issue, however. Oh, and, having that bird-catcher sticking through the hood looks cool, but don't get caught in the rain.
Dyers has been in the biz forever, and offer many Mopar setups, not just one or two.
http://www.dyersblowers.com/187/1658.html
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clint
Dodge Dakota
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9/01/2006
22:44:14
| RE: Supercharger
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give this guy a cookie
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dak doctor
Dodge Dakota
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9/01/2006
22:46:11
| RE: Supercharger
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You really can't use a 6-71 or 4-71 blower ( the kind that sticks out of the hood ) on a stock motor and have it last a long time. these blowers are made for racing or pro street applications and usually require race cams and engine componants that are a little sturdier than stock engine parts.
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gen1dak
Dodge Dakota
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9/01/2006
23:24:36
| RE: Supercharger
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Not impossible. With the right combination of pulleys, boost can be limited to safe levels. However, the 6-71 will require more power to turn it than smaller types, so by limiting the boost, and using more crank HP to turn the blower, your power gains are not so good, especially when compared to smaller units that soak up less power. That's why the 6-71 is typically used on higher performance setups. The blower interest was so great, B&M developed streetable (and underhood) roots-style blowers, some of which found their way under the hoods of the early and mid-80's Camaros. There was even a model for the Mopar 2.2, and there was even a mockup of a Don Garlits supercharged Dodge Omni using the B&M unit as a follow-on to the GLHS. Too bad it didn't make production. It's a foregone conclusion that any decent boost levels require heavier guts, particularly the pistons. Back in the 70's and early 80's, the 6-71 style was all the rage on street machines, albeit street machines with forged internals (not necessarily specially built...many just plucked a 60's era engine that already had forged goodies). The "Roots" style blower was pretty much it. There were others, but the 6-71 was the one everybody went for (til the smaller B&M's hit the market), and not all were race-only. Many were run on earlier versions of Hot Rod Magazine's Power Tour cross-country rally. Also, the addition of teflon coatings to the blower rotors has helped improve performance and reliability. B&M got out of the biz a while back. Looks like Weiand, under Holley's ownership, still makes the smaller roots units, but a manifold for a Mopar, especially a Magnum, would probably be an issue.
http://www.holley.com/types/Small_Block_Chevrolet_-_177_Series_.asp
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N56629
Dodge Dakota
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9/01/2006
23:41:17
| RE: Supercharger
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Over the past year I have seen at least two B&M blowers on ebay for the pre-mag v6. These were complete with intake manifolds. It's likely the manifold could be modified to fit the magnum motor along with adding the bongs for the injectors.
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gen1dak
Dodge Dakota
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9/02/2006
00:18:03
| RE: Supercharger
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Pretty much in the tradition of Mopar owners. As I said, mods or eBay/swap meets, not impossible, an issue.
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clint
Dodge Dakota
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9/02/2006
18:12:05
| RE: Supercharger
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sooo dose that mean with a stock motor besides a cam its not worth runnin a 671? and waht makes it a 671. what dose that mean?
if i did put one on my motor how much boost could i run saftley?
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gen1dak
Dodge Dakota
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9/02/2006
20:22:18
| RE: Supercharger
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This is as good a definition as any:
"Positive displacement superchargers are usually rated by their capacity per revolution. In the case of the roots blower, the GMC rating pattern is typical. The GMC types are rated according to how many two stroke cylinders, and the size of those cylinders, it is designed to scavenge. GMC has made 2-71 3-71 4-71 and the famed 6-71 blowers. For example a 6-71 blower is designed to scavenge 6 cylinders of 71 cubic inches each and would be used on a two-stroke diesel of 426 cubic inches which is designated a 6-71 and the blower takes this same designation. However because 6-71 is actually the engines designation,the actual displacement is less than the simple multiplication would suggest. A 6-71 actually pumps 339 cubic inches per revolution."
Clear as mud now, isn't it?
So, from that last number (339 cubes), you can see that the 6-71 would put out a slight positive pressure just barely turning over on a small block Mopar. You're gonna have to underdrive it to keep below a safe 7psi, or so. The 6-71 is really intended for larger engines, as most offered applications are for hot 392 Hemis, and larger displacements.
If your heart is set on the traditional "Roots-style" blower, and they do have a great, classic look about them, and are proven performers, go with the smaller units like the Weiand 144....a good size for the 5.2.
http://www.holley.com/types/1993-95_GM_TBI_Trucks_-_144_Series.asp
Weiand has done stuff with Mopars through the years, and if they can't hook you up with a blower manifold, I bet Dyers would be happy to.
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clint
Dodge Dakota
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9/02/2006
23:09:21
| RE: Supercharger
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that dose help alot. i didnt know any of this soo anything said will help lol. but that first section was hard to understand. if its a 6-71 isnt that for a 6 cylinder? thats what it sounded like. and if a 6-71 is too much dont they make a 4-71? or am is it a limited selection? when you said under drive, did you mean keep the rpms low so i dont hurt the motor?
if i ask too many question let me know lol. i just think this stuff is badass and would be sweet to know somthin about it
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trucky
Dodge Dakota
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9/03/2006
03:29:59
| RE: Supercharger
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someone get this guy one on one...he has a lot to learn... of course i do enjoy readin this gibberish on blowers
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gen1dak
Dodge Dakota
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9/03/2006
23:17:46
| RE: Supercharger
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Underdriving, when used with the roots-type blower, is when the pulley on the blower is of the size that it turns less than a 1:1 ratio with the crank. This causes a reduced level of boost to be produced. The 6-71 designation is just the way they designate the capacity. Originally, I think it was used on a 6 cylinder bus engine, something like that. Still, for a stock engine (5.2), it's total overkill.
Clint, don't take this the wrong way, but "trucky" is right. You really do need to get some books on the subject and read. No way around it. The time you spend learning will be paid back many times over in saved (non-exploded engines) and time. Seriously, blowers are a recipe for a quick, and explosive end for an engine....and especially in Mopar engines due to the long connecting rods. Long rod engines tend to maintain compression longer as the piston moves away from TDC (that's the theory, anyway). This makes it even more critical to understand the basics thoroughly, before you just go and bolt one on. You're looking at several thousand dollars down the tubes, or perhaps worse, a wicked-looking engine that runs like crap. Not trying to discourage you, but this isn't the venue for that level of tech. There are some very good references online, and books are out there. Ya gotta do the homework.
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clint
Dodge Dakota
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9/04/2006
10:25:22
| RE: Supercharger
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aight i got ya. i dont want to sound like i dont know anything cuz i know i do. i mean i baically teach my auto class cuz the teacher is a retard. i mean i know my stuff. but its the technical stuff that i dont know. i never learned anything about blowers. i didnt know that it was THIS technical. but i know what its like to be asked a million questions aobut somthin that they wont understand. sooo thanks for the info it dose help alot
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