Guest silversn95 Posted August 4, 2006 Report Share Posted August 4, 2006 Can anyone give me an estimate on how much hp the stock internals on a 4.6 2v motor can handle? I'm currently working on a buildup project aiming at 400 whp n/a, and trying to decide if i need to upgrade the internals...any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
Mensan Posted August 4, 2006 Report Share Posted August 4, 2006 You will not reach 400whp NA on a 4.6. With upgraded internals and big bore/stroker kit, you would not see 400whp NA. What kind of mods are you doing? Quote Link to comment Share on other sites More sharing options...
Guest silversn95 Posted August 4, 2006 Report Share Posted August 4, 2006 CAI, 75 tb, plenum, undecided on intake, undecided on cam, 90 MAF, 24 lb injectors, undecided on heads, u/d pulleys, msg dist, radiator, fan, shorty headers, o/r x pipe, exhaust, tune. 400 whp IS probably a pipe dream, but we'll see where this takes me. Any suggestions or recommendations would be helpful. Quote Link to comment Share on other sites More sharing options...
Guest 78novaman Posted August 5, 2006 Report Share Posted August 5, 2006 What year 4.6L are we talking. Is if from a truck, crown vic, or mustang? A 4.6L can take the power levels you are talking about. Just keep the revs to 6000rpm; 6500rpm for the Mustang motor and you should be fine. My reccomendation is to go with stock PI heads. Port them and if you have the $$$$ get a set of nice cams. You'll have a nice ~350hp quick revving v8. Quote Link to comment Share on other sites More sharing options...
Guest silversn95 Posted August 5, 2006 Report Share Posted August 5, 2006 98 mustang 4.6. unfortunately, no PI heads. the stock heads make great low end torque, but the hp's pretty limited. should i swap out for 99+ heads? or port and polish existing ones? or maybe aftermarket? Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted August 5, 2006 Report Share Posted August 5, 2006 why spend money to port and polish turds? get pi's at least Quote Link to comment Share on other sites More sharing options...
99BlownYellowGT Posted August 5, 2006 Report Share Posted August 5, 2006 Sorry to break the news but you will be lucky to hit 300rwhp with those mods.The stock internals can handle around 400 Quote Link to comment Share on other sites More sharing options...
Guest powers Posted August 5, 2006 Report Share Posted August 5, 2006 why spend money to port and polish turds? get pi's at least becasue ported npi's are making the same amount of power as PI heads. As stated already with those mods you will not make 300 rwhp. Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted August 5, 2006 Report Share Posted August 5, 2006 yes greg but why not start with a better head then have them worked. Granted I am not a pro at 4.6 becouse my car is a 5.0 so that is what I read up on. But starting with the best you are able to buy then moveing forward just seems to make more sence. Quote Link to comment Share on other sites More sharing options...
Mensan Posted August 5, 2006 Report Share Posted August 5, 2006 yes greg but why not start with a better head then have them worked. Granted I am not a pro at 4.6 becouse my car is a 5.0 so that is what I read up on. But starting with the best you are able to buy then moveing forward just seems to make more sence. Once ported they are the same head. Why spend the extra money on the core when you achieve the same result in the end? Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted August 6, 2006 Report Share Posted August 6, 2006 well I was under the idea that the pi's head would have more material to port out. So what you are saying is they are just a factory ported head not a differant casting with bigger ports with the same wall thickness as the non's? Quote Link to comment Share on other sites More sharing options...
Mensan Posted August 6, 2006 Report Share Posted August 6, 2006 No, it's definitely a different casting, and also the PI heads will increase compression if bolted on to a stock long block. You can open the non PI versions up to mate up to a PI intake. I think there's more material in the non PI head. Quote Link to comment Share on other sites More sharing options...
Spidey2721 Posted August 6, 2006 Report Share Posted August 6, 2006 If you would want to have the motor built by someone I can prolly get a number for a guy in Michigan that builds 4.6's. A buddy of mine had a motor built by him and its nice. If you are going NPI look at the SVO intake. Quote Link to comment Share on other sites More sharing options...
ghost1647545489 Posted August 6, 2006 Report Share Posted August 6, 2006 Sean Hyland Motorsports are good with the 4.6, contact them for info on what to do. You definently need a blower to go 400 or better with a SOHC motor Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted August 6, 2006 Report Share Posted August 6, 2006 So eli is a ported to the max pi and a ported to the max non going to flow the same then? Quote Link to comment Share on other sites More sharing options...
Guest powers Posted August 6, 2006 Report Share Posted August 6, 2006 So eli is a ported to the max pi and a ported to the max non going to flow the same then? They will flow close enough to call it the same. One of the advantages of the PI head is raised CR through a smaller cc combustion chamber. You will also want the later style intake and the PI cams. So there are some other things that add power besides just the heads. So you can work either set of heads, it all boils down to budget in my opinion. Quote Link to comment Share on other sites More sharing options...
Mensan Posted August 6, 2006 Report Share Posted August 6, 2006 ^^ I agree with everything posted above. Quote Link to comment Share on other sites More sharing options...
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