GU 4.5 into a GQ

[RN]

I have a GQ 4.2 petrol carby and I suspect that one of the valves may have receded into the head or is burnt. I am going to do a compression test to see what cylinder is the problem. It is fairly low mileage but it has been on LPG for most of its life.

The heads are fairly expensive to reco I have been informed so as an option I maybe able to get a second hand 4.5 EFI engine from a friend. Is it possible to install the larger engine and configure it to operate it with a carby. Not really interested in do all the EFI harness, electric fuel pump change over.

Basically install the 4.5 and utilise the carby manifold. Doable???

regards

RN

[Marcin]

Hi if you use existing manifolds it should work fine maybe lack full power on petrol but you can adjust LPG for full power no problems.

[AFeral]

Maybe worth checking the manifolds do interchange. I remember reading somewhere that the in let manifolds were not interchangable. Could well be wrong but worth checking all the same.

[DamTriton]

Check you ignition requirements too, the EFI usually handles the ignition from a Hall effect sensor on the distributor spindle - may not be compatible with the GQ's ignition system.

[Banzy]

Buy a new(er) one?

There was a nice GU 4.2 TD for sale on here a while back.........

[Lepa]

i've been told a tb45 is only a tb42 stroked out. where it's the same blcok to take a carby head i do not know. if it was me in your situation i'd look to the efi option, but i dont know how much of a pain in the arse it might be, never done anything like that......yet!

[BowTieGQ]

Patrolapart have done it and offer it as a service. Pretty sure they keep it carb for simplicity and cost.