What is the engine difference between an 02 HD motor and an 02 Lightning motor?

I know there is the 40 HP. But what accounts for that 40HP? Pulley size? Chip?
Does the HD have forged rods and pistons like a Lightning?

 

1batman1,

There have been quite many discussions about (di)similarities of these engines, both here and on other boards. General consenus is that these engines are identical (there is no official FoMoCo confirmation of this). Both are, from all we know, using same block, rods, and pistons (please note that L does not have forged rods).

Difference in HP comes from:

1) Reduced air intake opening
2) Different pulley
3) Different chip tune
4) Different exhaust

Also, keep in mind HD has two-piece driveshaft.

If you want to read more on this you can easily find number of related threads using 'search' function of the forums.

ZoranC

 

in the ford service manuals, they classify the 5.4 into to categories
supercharged and non supercharged. so i would assume the long block 5.4 supercharged lightning or harley engines are identical.
they do not have any repair procedures in the manuals for the superchargers themselves. there are 2 sections regarding superchargers in the manual, removal and installation and supercharger cooling.

 

Zoran is correct, but let me add a bit to his explanation-
1)Reduced air intake opening This is due to a smaller opening in the lower valance on the HD. The smaller opening allows less air to flow across the intercooler radiator core.
2) Different pulley The upper pulley on the HD is larger. This causes the blower to turn slower, and the net result is "about" 2# less boost at any given RPM
3) Different chip tune Still a lot of contraversy on this one. From everthing I have read, the HD computer is just as "capable" of producing the same hp/tq as the Lightning computer.
4) Different exhaust The HD exhaust is longer, creating more backpressure than the Lightning exhaust...

Like Zoran said, do a search, and you will get lots of results...

 

All said!

 

Many are surprised to find out that there really isn’t a 40hp difference in these engines, as they are a lot closer than Ford would have you believe.

 

I don't have enough data to confirm this with statistical precision, but digging through postings on this and other boards leaves me with impression that "average" stock HD dynos at 310-313RWHP, while "average" stock L dynos at 350-355RWHP, which would put them approximately 40HP apart. Is my impression incorrect one?

ZoranC

 

The average HD seems to be closer to 330, so that’s where the number came from, but I have seen them put out as low as 313, but obviously there are many variables.

 

Actually, the number "330" is the displacement (330ci) of the H-D engine ... has nothing to do with HP rating! Ford carries the advertised rated HP at 340 ... I'm sure they probably did, in fact, record that too ... under controlled circumstances/environment.

 

Ok I know that the answer is proberbly some place else on the site, but whats the difference between the 00 and 02 engines, other than the charger ?

 

JL confirmed for us that the harley and L motors both have the same rods. However I believe the harley motors have different pistons, since all of the literature I've seen lists the H-D's compression at 9.0:1, and the Lightnings' as 8.4:1.

I haven't seen this confirmed or denied by anyone who would know the truth.

 

Oh, NO! ... oh, boy!! ... here we GO!!!

 

I tried to clear this up a LONG time ago, but since then...

.....guess what????

IT HAS BEEN SETTLED!!!!!

Same pistons, same rods (not forged), same motor.

That little thing at the end of the sentence is a PERIOD!!!!

Thank you, have a great day.