blazinjames
NAXJA Forum User
- Location
- Vancouver BC, Canada
can someone tell me what the differences are between a normal 4.0L and 4.0L highout put?
thanks
thanks
the major one is the engine control system, the H.O. head is differant, the ports are slightly differant, tb is differant, coolant system is differant. fuel system is differant at the fuel rail... etc etc...
its differant. but not tooo differant. whatcha got in mind?
I currently drive a 95 XJ and Im planning on buying a engine to rebuild im just wondering if I need to buy a highout put engine or just a regular one
any 91-95 will bolt in without swappin any sensors, a 96-99 would work except theres no 2nd coolant senso on the back on the head, and all sensores will have to be swapped over aswell as dist. and coil
I didnt think about that..i dont want to have to deal with swapping over sensors and what not
the fuel rail was essentially the same 87-95, 96 a bastard year, 97-01 essentially the same, so these two system aren't quite a Renix/H.O. differences.
Not sure, maybe closed cooling system was a mid year split, but my 91 has an open cooling system and was completely stock when I bought it.87-90 4.0 with Renix (Renault-Bendix) engine management.
91-01 are H.O. engines--HP was increased, cam was changed, pretty much everything xcm posted above.
However, the closed cooling system for the 4.0 was 87-91, and the fuel rail was essentially the same 87-95, 96 a bastard year, 97-01 essentially the same, so these two system aren't quite a Renix/H.O. differences.
I *think* my 96 has a second CTS on the back of the head, will have to check. Would look at my FSM but I was an idiot and put it in my storage unit when I movedany 91-95 will bolt in without swappin any sensors, a 96-99 would work except theres no 2nd coolant senso on the back on the head, and all sensores will have to be swapped over aswell as dist. and coil
However, the closed cooling system for the 4.0 was 87-91, and the fuel rail was essentially the same 87-95, 96 a bastard year, 97-01 essentially the same, so these two system aren't quite a Renix/H.O. differences.
i beg to differ, my 1990 xj has a differant fuel rail than a 92 mj... injectors are also slightly differant... maybe they do the same thing theoretically, but the parts arent the same...
96+ was single, returnless line.
Is there a down side to not having a return line on the 96?
Yep... heat soak / vapor lock.
Very rare to have it be an issue on anything except a 2000 or a 2001 though, due to the pre-cats added just below the manifold and injectors (this can be solved by adding a timer that keeps the e-fan on for a few minutes after you shut the vehicle down.) It does pop up occasionally on older XJs though.
Oh and the fuel pressure regulator is either inside the tank (96) or on top of the tank (97+) with the returnless system.
i beg to differ, my 1990 xj has a differant fuel rail than a 92 mj... injectors are also slightly differant... maybe they do the same thing theoretically, but the parts arent the same...
Not sure, maybe closed cooling system was a mid year split, but my 91 has an open cooling system and was completely stock when I bought it.
Yep... heat soak / vapor lock.
Very rare to have it be an issue on anything except a 2000 or a 2001 though, due to the pre-cats added just below the manifold and injectors (this can be solved by adding a timer that keeps the e-fan on for a few minutes after you shut the vehicle down.) It does pop up occasionally on older XJs though.
Oh and the fuel pressure regulator is either inside the tank (96) or on top of the tank (97+) with the returnless system.