donl
Well-Known Member
Planning to build such a motor for my '03Expy and want to collect any thoughts from forum members that may have experience with building up the 2V 4.6L motor.
My first thoughts was, of course, building a nearly stock motor and supercharging but I would only do that if there was a "bolt on" package and I have not been able to find one.
I would not rebuild the motor (160K) that is currently in the vehicle which has been mildly modified with under drive pulleys, electric fans, shorty headers, CAI and a 5 Star tune. I expect HP has been increased from 232 to 250-260; I can hold my own with my workmates later model F-150 EB 5.4L. So I am looking at picking up 100HP, naturally aspirated which I believe doable. Also added 4.10 gears and it moves out smartly but far from a barn burner.
Generally, the plan includes:
-overbore to establish a true bore; .010"-.020"
-increase CR from 9.4 to say 10
-have heads ported or go to aftermarket (one of the best head porters in the country is 45 minutes away and a good friend)
-new intake manifold (no idea what is available)
-mid duration cams, say 235*-240* intake and exhaust
-replace crank with something stronger (no idea what is available; have been told the OEM crank will hold up)
-retain CAI; maybe need to replace with something that flows more air??
-retain shorty headers (I know, full length would help but I don't want to get into modifying the exhaust)
-tune to pull it all together.
Plan B is go to aftermarket for crate motor and heads but haven't researched that option/cost/complications? yet.
Any suggestions from forum members are welcome but don't tell me to replace the 4.6L with a 5.4; not going down that road.
My first thoughts was, of course, building a nearly stock motor and supercharging but I would only do that if there was a "bolt on" package and I have not been able to find one.
I would not rebuild the motor (160K) that is currently in the vehicle which has been mildly modified with under drive pulleys, electric fans, shorty headers, CAI and a 5 Star tune. I expect HP has been increased from 232 to 250-260; I can hold my own with my workmates later model F-150 EB 5.4L. So I am looking at picking up 100HP, naturally aspirated which I believe doable. Also added 4.10 gears and it moves out smartly but far from a barn burner.
Generally, the plan includes:
-overbore to establish a true bore; .010"-.020"
-increase CR from 9.4 to say 10
-have heads ported or go to aftermarket (one of the best head porters in the country is 45 minutes away and a good friend)
-new intake manifold (no idea what is available)
-mid duration cams, say 235*-240* intake and exhaust
-replace crank with something stronger (no idea what is available; have been told the OEM crank will hold up)
-retain CAI; maybe need to replace with something that flows more air??
-retain shorty headers (I know, full length would help but I don't want to get into modifying the exhaust)
-tune to pull it all together.
Plan B is go to aftermarket for crate motor and heads but haven't researched that option/cost/complications? yet.
Any suggestions from forum members are welcome but don't tell me to replace the 4.6L with a 5.4; not going down that road.