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Post by andy2003si on Mar 22, 2012 19:49:18 GMT -6
I hear that the 4.6 intake plenum reguardless of year (even under the year 2000, like 1994-1999 4.6 intakes) are made of a different material than the intake material/design found on the aurora 4.0? (It says the aurora engine tried to save weight for it's thicker cylinder walls by using a lighter material intake & using a lighter/different material made oil pan in alot of places, including wikipedia).
But mainly I wanna swap-in a 2000+ 4.6 intake because I know it should add more horsepower because it's a CENTER feed design intake VS. the standard end fed design which makes sure all the cylinders get the same amount of air, and balance means alot especially regarding a V8, i've also heard it's not made of platic like the 1g auroras intake is, which means could it be ported & polished, or at least ported (I was thinking of ordering one and doing some porting work to it, AND the intake ports it connects to in the engine bay?).
But my main question is if I swap to a 2000+ 4.6 plenum is there any new sensors or anything that this intake requires that my 1997 OBD2 (yes not OBD1!) 4.0 Aurora dosen't have to make it not compatible?
And I know it's center-fed design but does anyone know if it's more flowing? I know the whole 4.6 (and especially the 2000+ 4.6') COMPLETE intake/heads are different and more flowing then the 4.0's, especially the re-done 2000+ 4.6!
But I can get the plenum for about 75 bucks shipped ebay and I have to take my throttle body off to clean my mass air flow and IAC because its throwing a hard fault code so I thought why not do some port & polishing and swap a 2000+ 4.6 plenum while i'm around there?
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Post by tipsymcstager on Mar 22, 2012 20:33:03 GMT -6
i looked into this last year, 01 and up caddy intakes are center feed, like you say. but the factory ones are plastic like they all are! i cross ref all the parts and the TB are the same part# for caddy and olds, the only thing dif as far as i could tell is you'll need to use the new design gaskets (fel-pro MS93313 for 01 and up). all sensors are the same. be sure the intake is 01+ not a 2000. caddys used the leftover 99/00 intakes before the redesign in 01  oh, by the way ODB1 fell to the wayside in 95, and GM went ODB2 for all new cars in 96 ;D |
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Post by andy2003si on Mar 22, 2012 21:00:27 GMT -6
i looked into this last year, 01 and up caddy intakes are center feed, like you say. but the factory ones are plastic like they all are! i cross ref all the parts and the TB are the same part# for caddy and olds, the only thing dif as far as i could tell is you'll need to use the new design gaskets (fel-pro MS93313 for 01 and up). all sensors are the same. be sure the intake is 01+ not a 2000. caddys used the leftover 99/00 intakes before the redesign in 01 oh, by the way ODB1 fell to the wayside in 95, and GM went ODB2 for all new cars in 96 ;D My dad said not just GM but it people who make the car laws passed a law that in 1992 all cars must share the same ECM/PCM's (because they were needing scanners for all different car manufacturers), then came OBD1 in 1992 (but I think the law became 100% official where all cars had to convert to OBD in 1996 and to OBD2, was when it was made an 'official law' in the USA/Canda, and even before that they had OBD0 (my 1990 prelude had OBD0, but my friends 1989 prelude DID NOT have OBD0 I even swapped it with a 1991 Integra GS ECM to see if it'd run and it did), and then in 1996 they passed a law again where ALL cars had to update to OBD-2 by 1996 (however some manufactures did this in 1995) and then I believe in the early 2000's OBD-3 out now, I think THAT came out in early 00's (and by no they probably might even have OBD-4, haven't been keeping myself updated). But I know all 1996 and above years are OBD-2 Standard, but was just making it clear for those who wouldn't know it's an OBD-2 powered 4.0. |
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Post by shelbyracing on Mar 22, 2012 21:52:01 GMT -6
I am considering this as well, let us know what your results are. Like 0-60 comparison before n after.
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Post by andy2003si on Mar 28, 2012 11:26:54 GMT -6
I am considering this as well, let us know what your results are. Like 0-60 comparison before n after. No problem, keep in mind though i'll also probably be porting and polishing the intake ports which will have a gain no matter the intake, but with your shelby then it should be about the same amount of gain, if not even less of a gain than your shelby would earn. If I were you i'd swap in the 00+ center feed intake, 00+ roller followers & 00+ direct coil ignition (if you could manage to do it without adding any sensors or doing any major rewiring). Those 3 things are mainly what made the 2000+ 4.0/4.6 engines able to decrease the compression ratio down to 10 flat instead of 10 and a half and keep the horsepower ratings, which is probably equal to at minimum 20-25 horsepower; coupled with your shelby i'd suspect a minimum 30-35 horsepower increase if not more, no? |
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Post by shelbyracing on Mar 28, 2012 11:34:47 GMT -6
I've been thinking of those, but it is a lot of work. Maybe when i get more time I'll be able to. Roller followers are probably the largest increase. Wish I could find a picture of the ones used in the Northstar.
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Post by shelbyracing on Mar 28, 2012 12:16:35 GMT -6
I would think that gain possible with a polish to go with it. What kind of polish are you using? I have a dremel and will atleast polish my existing intake, but more likely I will swap if all goes well with your swap |
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aurora4088
Aurora Watcher
Her name is "BABY" and she eats imports alive!
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Post by aurora4088 on Mar 29, 2012 11:58:09 GMT -6
There is no such thing as OBD3. OBD2 is still the global standard for Fiat to Ferrari. They mandated a common style 16-pin data link connector (DLC) as well as to the location. I believe its says DLC location is to be no more than like 18inches away from the steering wheel/column. Also mandated common p-codes definitions for those codes and common name for sensors. EX: In the early days of computers any sensor(lets say Throttle Position Sensor or TPS) could have been called by many different names depending on the manufacturer or even the model of car. Got really confusing trying to keep track of all that lingo. Those werre the main reasons for the OBD2 switch. OBD1 came with new computer technology, OBD2 simplified the whole deal. Hope this clarifies a few things.
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Post by andy2003si on Apr 4, 2012 10:38:23 GMT -6
I would think that gain possible with a polish to go with it. What kind of polish are you using? I have a dremel and will atleast polish my existing intake, but more likely I will swap if all goes well with your swap Not sure what polish i'm using as my dads going to teach me how and work with me most of the time on it also using his dremel, he P&P'd his motorcyle 4cylinder DOHC 8V heads & also several chevy small blocks (mostly 350s), but after he did his motorcyle it dynoed at 172 Wheel horsepower (21 more WHP than before he did it) and this was on an 1100 CC DOHC (but 8V bike)!! |
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Post by genone on Apr 13, 2012 6:00:00 GMT -6
Not sure what polish i'm using as my dads going to teach me how and work with me most of the time on it also using his dremel, he P&P'd his motorcyle 4cylinder DOHC 8V heads & also several chevy small blocks (mostly 350s), but after he did his motorcyle it dynoed at 172 Wheel horsepower (21 more WHP than before he did it) and this was on an 1100 CC DOHC (but 8V bike)!! Never heard of an 1100cc twin bike motor make that kind of power. My 1600cc big twin Harley makes 105hp and 110lb/ft to the wheel, and that's with a tune. What kind of bike is it? Buell? I start out with sanding discs to port. After knocking down the big burrs I move to a medium sanding stone. Then a fine. After that I brush it extensively with fine steel wool. Then I use 2-3k grit sand paper with a mixture of Dawn dish soap and soda water. Finally I use a cloth buffing tool(on the Dremel) and a polishing compound. Has worked great for me. On aluminum, of course. Iron is a PITA no matter how you do it. |
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