Differance between 3.9 & 4.0 block ?

[Damo]

Hey all,

Just a quick question. I picked up a motor for my EB the other day it's a 3.9, anyways on the front of the motor it has 87DA-6059-AA. I had a look at the motor in my EB (series 2, pre smart lock) and it also has 87DA-6059-AA on the front of the block, the head is a 91AA. I found this a bit strange as it is supposedly a 4.0.:

Did they have the same code for the 3.9 and 4.0 blocks ? Or has my car been stooged from the factory. : :

[stockstandard]

Id say since both 3.9's and 4.0's come from the same casting (I believe) you probably havnt been stooged. A 4.0 is just a 3.9 that has been slightly bored out.

[5L]

im not sure on this but someone told me that is was just the heads that were different but im not sure on this for sure

[Damo]

someone with an EB2 wanna have a look at the front of the block and tell me what numbers are printed on it ? it's just under the idler pulley.

[EBFalcs]

mine says 91AA

[QUIKXR6]

maybe the engines headgasket has been changed and at the same time the head may have been replaced...

[Damo]

but's it's suppossed to be a 4.0 It doesn't really faze me, the motor is stuffed anyways, but i just wanna know if the EB 4.0 motors were 87DA-6059-AA. Maybe cause mine is an Early EB2 they used the same numbers.

EBFalcs - I think you were lookin at the head, mine is 91 AA too, i'm interetes ion the numbers on the fron of the block above the Balancer.

[gthofan]

the two engines also have different power.
*3.9L multi-point 6 cyl
Bore and stroke: 93 x 99 mm
Power: 139kW at 4250rpm
Torque: 338Nm at 3500rpm
Overhead camshaft, 2 valves per cylinder
Fuel system: EEC IV fuel injection
Compression ratio: 8.8:1

4.0L 6 cyl (Series II)
Bore and stroke: 92 x 99 mm
Power: 148kW at 4500rpm
Torque: 348Nm at 3750rpm
Overhead camshaft, 2 valves per cylinder
Fuel system: EEC IV fuel injection
Compression ratio: 8.8:1

sorry bout that, just had to confuse the situation!!!

[Matt_971]

gtho fan how can the 4ltr have a smaller bore than the 3.9?

I thought the differnce was just the bore???


THanks
Matt

[gthofan]

i got the info off this website!!!
http://www.geocities.com/falconfacts.../ebfalcon.html
check it out. every falcon made, sweet website, shows all stats

[INJECTED_250]

i thikn u will find that that part no is just the one of the timing cover mabie???.. or is that the actualy number CAST into the block(steel)

[Damo]

yeah it's on the timing cover lol. So it's just a the part No for the timing case, that would make sence. Thanks injected!

[INJECTED_250]

THe 3.9 blocks are slighly narrowier where the oil gallery is on the side, its a visual differnece,

EA and EB engines shared the same timing cover 87DA as mentioned. only ED got the later 91 DA timing cover with EF style top gasket ;)

[needfordspeed]

The block's part number is locatad on the bottom of the exhaust side, just above where the sump bolts up.

Good to see you got a new motor. How much was it? Is it stock or is there some work done to it or something?

Sundeep