GU 4.5 in a GQ

[GQ Bear]

Just wondering if anyone knows whether TB42e manifold, etc will bolt straight on to 4.5l petrol heads. Also will 4.5 match up to GQ bell housing. Are starter motors the same/interchangable, etc?

I've done the head gasket, or cracked head (not sure yet) on a TB42e which I've flogged real hard. I've also found a cheap (fire damaged) 4.5l engine. I reckon it might cost about the same to get the 4.2 going hard (few mods) as it will to get the 4.5l going in the GQ.

Any thoughts??

thanks

[bundyrum4x4]

stick with the 4.2

Got a GU with a 4.5 - nothing special power wise

[GQ Bear]

thanks greg

[RN]

stick with the 4.2

Got a GU with a 4.5 - nothing special power wise

GQ 4.2 petrol 125kw @ 4200rpm
325NM @ 2800
GU 4.5 petrol 145kw @ 4400
350NM @ 3600

Don't forget the GU is 170-200kg heavier than the GQ, so what ever power gains it had over the GQ was eaten up by the extra weight. Therefore a 4.5 in a GQ should be a better power to weight ratio.

If I had to install another Patrol motor in my GQ and the choice was either a 4.2 or 4.5 , I'd choose the 4.5 for the extra KW and torque.

Just sticking the 4.5 into the GQ gives 16% more power and 8% more torque. Equates better than trying to hot up the 4.2 to get similar power increases.

[fatassgq]

My 4.5 petty in GQ has 150 or more hp at the back wheels on 33's.

It has a haltech computer but is otherwise stocko.

Can't wait for turbo but!!!

The motors go in reasonably easy not a hell of a lot to change just little things.

The 4.5's have a better inlet design in that you can get to all the plugs etc.
I think the 4.5 head will bolt on to the 4.2 motor so this may be an option?

Good luck

[fatassgq]

My 4.5 petty in GQ has 150 or more hp at the back wheels on 33's.

It has a haltech computer but is otherwise stocko. my truck is prolly only just shy of 3Tonne so it doesn't fly but it is not bad.

Can't wait for turbo but!!!

The motors go in reasonably easy not a hell of a lot to change just little things.

The 4.5's have a better inlet design in that you can get to all the plugs etc.
I think the 4.5 head will bolt on to the 4.2 motor so this may be an option?

Good luck

[GQ Bear]

The motors go in reasonably easy not a hell of a lot to change just little things.

The 4.5's have a better inlet design in that you can get to all the plugs etc.
I think the 4.5 head will bolt on to the 4.2 motor so this may be an option?

Good luck

The one i've found is fire damaged. Cabin fire mostly but rear of engine and manifold is effected. That's what's obvious at first glance anyway. could be more.
That's why i was wondering if 4.2 efi manifold would bolt straight on to 4.5.

what other 'little things' need changing?

[Simo63]

Mate of mine put a 4.5 head on his 4.2 GQ and it went heaps harder so he tells me. Food for thought.

[GQ Bear]

Mate of mine put a 4.5 head on his 4.2 GQ and it went heaps harder so he tells me. Food for thought.

Did he retain the 4.2 manifold aswell? This is what i'm trying to establish as i'm under the impression (read it somewhere) that the 4.5l is basically a 4.2l block bored out with matching head and manifold is made simpler so its easier to work on engine than tb42e. something like that anyway. i'm sure there's a bit more to it.

[beretta]

Go a V8 ya big turtle lover........

[MyGQ]

no the 4.2L manifold is a different bolt pattern to the 4.5L head. The exhaust is the same, but the inlet is different.

the 4.5L head will bolt to the 4.2L engine as the TB45 uses the same block as the TB42.

[awill4x4]

I'm sure there's some differences at the front of the engine. I think the thermostat housing is located differently and I believe the water pump is different. Whether this means the timing cover (or timing cover bolt pattern) has changed I don't know. The 4.5's also don't have a coil like the 4.2's which would probably mean the distributor is different as well. It would also mean the 4.5's must run some sort of "crank fired" ignition as well I suppose. If that's the case the computer would be different to address the different sensor issues.
GQ Bear, if you want to check out a 4.5 block and head I've got them at work in Carrum Downs also from a fire damaged GU. This one's been burnt' pretty hard with no inlet manifold, rocker cover or timing cover.
If you want to have a look that's fine with me, my work number is 97750558 so just ring me at work. I'm trying to find some time to get it onto an engine stand and strip it all down then get it all hot tanked and build it back up. I've got the same idea as you to use the TB 42e injection off my car to replace the needed parts.
I've been talking to one of the mechanics next door and he says if you wan't run it primarily on LPG to deck the block and machine the head and up the compression to around 9.5 to 1 and it should liven it up nicely with a little gas cam to suit and a set of headers to free up the exhaust as well.
Regards Andrew.

[Simo63]

Mate of mine put a 4.5 head on his 4.2 GQ and it went heaps harder so he tells me. Food for thought.

Did he retain the 4.2 manifold aswell? This is what i'm trying to establish as i'm under the impression (read it somewhere) that the 4.5l is basically a 4.2l block bored out with matching head and manifold is made simpler so its easier to work on engine than tb42e. something like that anyway. i'm sure there's a bit more to it.

Not sure buddy .. will try to find out and get back to you.

[MyGQ]

I'm sure there's some differences at the front of the engine. I think the thermostat housing is located differently and I believe the water pump is different. Whether this means the timing cover (or timing cover bolt pattern) has changed I don't know. The 4.5's also don't have a coil like the 4.2's which would probably mean the distributor is different as well. It would also mean the 4.5's must run some sort of "crank fired" ignition as well I suppose. If that's the case the computer would be different to address the different sensor issues.
GQ Bear, if you want to check out a 4.5 block and head I've got them at work in Carrum Downs also from a fire damaged GU. This one's been burnt' pretty hard with no inlet manifold, rocker cover or timing cover.
If you want to have a look that's fine with me, my work number is 97750558 so just ring me at work. I'm trying to find some time to get it onto an engine stand and strip it all down then get it all hot tanked and build it back up. I've got the same idea as you to use the TB 42e injection off my car to replace the needed parts.
I've been talking to one of the mechanics next door and he says if you wan't run it primarily on LPG to deck the block and machine the head and up the compression to around 9.5 to 1 and it should liven it up nicely with a little gas cam to suit and a set of headers to free up the exhaust as well.
Regards Andrew.

From memory, the TB45 has a timing belt rather than a timing chain, which means they changed the timing cover and water pump. the rest is the same, same oil pump. same borrom end, just bored out a little more to handle bigger pistons.

the TB42E (Injected) uses a pointless ignition system that is crank angle sensor driven to give the ECU info on when to fire the coil (same as the TB45). The Dizzy is just there for distributing the spark and to tell the ECU when the engine is on the TDC stroke, when to fire the spark.

[awill4x4]

.
the TB42E (Injected) uses a pointless ignition system that is crank angle sensor driven to give the ECU info on when to fire the coil (same as the TB45). The Dizzy is just there for distributing the spark and to tell the ECU when the engine is on the TDC stroke, when to fire the spark.

Yeah, but the TB42e has a coil lead which goes to the centre of the distributor cap as per normal but the TB45e doesn't so there's some sort of difference there. When it comes to electrickery I'm a complete numbnut.
Regards Andrew.

[stevepet]

Keep it going want to know all ins and outs as I have the opportunity to do the same swap. I have TB42e at the moment. Would love to use current inlet and exhaust. Exhaust is easy to change but how about all that wiring. It kills me every time.

Steve

[bigbluemav]

Keep it coming ........this is the engine swap that I'm considering. If not this, and $$ permits, a 4.8 would be great!! TB45E more realistic though.

[awill4x4]

If anyone has got the Nissan "FAST" spare parts CD's then perhaps they can do a search on them for part numbers. EG: inlet and exhaust manifold gasket part numbers on GQ's and GU's. If the part number is the same then the bolt patterns are sure to be identical. The same with injector part numbers, I'm pretty sure they wouldn't have gone to a bigger injector for the extra engine capacity but it's worth a check.
Even the ECU part numbers, but I think those will probably be different.
Others to compare: Thermostats, water pumps, harmonic balancers, alternators and anything else anyone can think of.
Regards Andrew.