Expedition/Navigator Engine Size????
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Senior User
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From: New Jersey
Expedition/Navigator Engine Size????
I have a 98 Expedition XLT with a 5.4 and my brother-n-law has a 2000 Navigator. I thought the Navigator had the same size engine but he say's his is larger that a 5.4 (possibly 5.7 ?????) Till I see him in person can anyone confirm the engines? I would have thought they both had the same motors.
Post Fiend
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Only if the Navi is equipped with the Intech motor. The Intech is a DOHC 4V. Without this option (which is the one requiring premium fuel) it is the same engine as the Expy (SOHC 2V). I may be incorrect but I thought the HP rating of the Intech was 300.
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New User
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From: BayArea
Well my neighbor has a '98 Expeditions EB Edit and Im pretty sure his engine size is the same as my '98 Navigator, including the stock HP, but i have an Intake, spacer, and soon headers, Navi in this case has more 
, but the diff comes when u have a 4.6L V8 Expy, then u have 215.... also on newer mods, i know for a fact that 2000+ stock Navs have 300 while srock Expys have 260...however im not too sure on the Expys CC's but the Navs is 302 CC's
, but the diff comes when u have a 4.6L V8 Expy, then u have 215.... also on newer mods, i know for a fact that 2000+ stock Navs have 300 while srock Expys have 260...however im not too sure on the Expys CC's but the Navs is 302 CC's
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From: in a house
98 Navigators had a 2 valve 5.4 liter engine. Around 3/4 through the year they went to the 4 valve heads.
With the 4 valve heads the compression went up, that is why you need premium fuel.
The engine blocks are exactly the same (between the 2 and 4 valve).
The only difference between a Navigator block and an Expedition block is the crank. A Navigator has a forged crank and an Expedition/Truck does not.
With the 4 valve heads the compression went up, that is why you need premium fuel.
The engine blocks are exactly the same (between the 2 and 4 valve).
The only difference between a Navigator block and an Expedition block is the crank. A Navigator has a forged crank and an Expedition/Truck does not.
Senior User
Joined: Aug 2003
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From: Texas
this really has little to do with this but if you bu 87 octane fuel in a 2000 navigator, what would really happen to it? would it really get damadged? ifso how fast? also what if i fill the tank with 87 and the put in one of those octane booster bottles....would it equate 93? or better? thanks
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From: in a house
My guess is it would run fine as long as you still have the stock computer in it. The Navigator uses a knock sensor and will back timing out if you start to pre-detonate. It would also depend on weather and what type of driving you were doing. With normal driving you would probably only notice you get better gas mileage with the lower octane!
Post Fiend
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Now John, didn't we recently have a conversation on the topic of Navi knock sensors or was it someone else? As far as the knowledge I have gained, the knock sensor is inop on the Navi Intech motors. Apparently too much noise from the DOHC valvetrain to filter out or something to that effect.
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From: in a house
Originally posted by hkiefus
Now John, didn't we recently have a conversation on the topic of Navi knock sensors or was it someone else? As far as the knowledge I have gained, the knock sensor is inop on the Navi Intech motors. Apparently too much noise from the DOHC valvetrain to filter out or something to that effect.
Now John, didn't we recently have a conversation on the topic of Navi knock sensors or was it someone else? As far as the knowledge I have gained, the knock sensor is inop on the Navi Intech motors. Apparently too much noise from the DOHC valvetrain to filter out or something to that effect.