1989 Troopy- 2H 4L Enging- Poor Fuel Economy & Lack of Power

Submitted: Wednesday, Jan 04, 2012 at 20:28
ThreadID: 91010 Views:9385 Replies:6 FollowUps:13
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Hi again guys.

Two issues i have noticed over the last two weeks driving to and from Adelaide.

1. Really poor fuel economy-
we were averaging around 400km per tank

(We have a top roof rack with a tent fitted.)

Is this normal?
Is there anything i can do to change this?

2. Lack of power-
No turbo has been fitted and dont particularly want one but is there anything else i can do for more power????

Thanks guys as always for any feedback.

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Reply By: Gaz W - Wednesday, Jan 04, 2012 at 20:31

Wednesday, Jan 04, 2012 at 20:31
Sorry about the spelling mistakes.
AnswerID: 474056

Follow Up By: V8 Troopie - Wednesday, Jan 04, 2012 at 23:27

Wednesday, Jan 04, 2012 at 23:27
Gaz, keep the top speed below 90 km/h and you get the best fuel economy that motor can do.
Regarding lack of power, its disappointing for a 4 l engine, especially when towing but she'll run all day if you don't ask too much of the old girl.
I had mine refitted with the Brunswick V8 and the lack of power disappeared with the fuel economy unchanged;-)
FollowupID: 748959

Reply By: Rockape - Wednesday, Jan 04, 2012 at 20:50

Wednesday, Jan 04, 2012 at 20:50
my old 2h used to get around 14 to 14.5l loaded and about 12.l light per 100k's.

I would do 600k on the front tank before I would change it over to the back one but remember that was running empty.

That particular engine was a dog, while I have seen other 2h engines go really well.

Cause of your problem could be tappet clearance, injectors, injector pump, air filter or old age (wear). Fitting a turbo muffler helps those old girls go better. I would not go to the expense of fitting extractors or a large diameter exhaust system.

If you love the old thing installing a 12ht turbo motor will see her lift her tail. They are hard to find and it would probably cost around $6000 + just for the recon.

AnswerID: 474059

Follow Up By: Gaz W - Wednesday, Jan 04, 2012 at 20:59

Wednesday, Jan 04, 2012 at 20:59
Yeah cheers RApe.

I only paid $10k for her so ill probably just do minimal amounts of work for what i need.

I have had the tappets adjusted and new filters throughout. I will put up with it i guess but i will get the injectors done at least.

She is in top notch condition. I bought her off a lady who owned her since new and her late husband was meticulous with the upkeep when he was alive.

Thanks mate
FollowupID: 748934

Follow Up By: Rockape - Wednesday, Jan 04, 2012 at 21:13

Wednesday, Jan 04, 2012 at 21:13
now diesel has changed with the huge reduction in sulphur which reduces lubrication to the pump and injectors. I run 200:1 2 stroke outboard oil in the diesel.

Have a look HERE
FollowupID: 748937

Follow Up By: The Bantam - Thursday, Jan 05, 2012 at 00:31

Thursday, Jan 05, 2012 at 00:31
Lots of people are reporting significant improvement running two stroke in diesel......there is plenty on the net about it and it has been well tested in older vehicles.

I cant say I have huge improvement in my hilux but it certainly runs smoother and quieter.

Getting you injectors cleaned or rebuilt can improve economy as can having you diesel pump adjusted ( tuned).

FollowupID: 748965

Reply By: Batt's - Thursday, Jan 05, 2012 at 01:11

Thursday, Jan 05, 2012 at 01:11
Hi gaz sorry about the long story but I'm sure it will help try www.costeffective.com.au I have been using their flushing oil concentrate for about 12 months and I reckon it's good my GQ had 360,000km when I tried their oil flush ,I done an oil change following the instructions they provide and got 2lts of extra sludge and crap out of the motor it runs better starts easier where before if I let the car sit for 3 or 4 days it had trouble starting like it was starving for fuel which is strange for a diesel but now it starts straight away I also use their fuel additive every 3 or so tanks of fuel. I recently put a friend onto it he has 2 troopie's the 1985 2h got 2 lts of sludge out & the 1997 1hz got just under 3lts of sludge out he said they both run better start easier and idle quieter I was sceptial at first but now think it's great and talk about fast delivery 2 days from brissy to me in mackay....Gaz just some extra info the GQ holds about 10.2lts of oil I put 9lts in to allow for the extra sludge that gets flushed out and pulled out 11lts I had my neighbour in to watch who is a fitter and he was blown away like I was give it a go gaz it's somewhere to start it saved me going to a mechanic hopefully it solves your problem if you try it.
AnswerID: 474088

Follow Up By: Batt's - Thursday, Jan 05, 2012 at 01:17

Thursday, Jan 05, 2012 at 01:17
ps ..I had a 2h 60 series 20yrs ago had extractors and a 2 and a half inch exhaust fitted that helped it pull better regulary got 12 to 12.5 lph
FollowupID: 748967

Follow Up By: Whirlwinder - Thursday, Jan 05, 2012 at 08:27

Thursday, Jan 05, 2012 at 08:27
I second the use of CEM oil flushing concentrate. I have used it for about 5-6 years in our 1HZ engine. I also have been using outboard 2 stroke oil for about the same time and the engine, at 240000kms has never run better.
Give it a try even though it seems expensive at first.
FollowupID: 748978

Follow Up By: Gaz W - Thursday, Jan 05, 2012 at 10:17

Thursday, Jan 05, 2012 at 10:17
Thanks guys.

So how many ml's would i be looking at for each of my 90 L tanks?

OR do i just need to put it in one tank?

Im a 30y.o Plumber so im not too good with the mechanical things.

I will look at getting some online.

FollowupID: 748993

Follow Up By: Whirlwinder - Thursday, Jan 05, 2012 at 11:13

Thursday, Jan 05, 2012 at 11:13
Just follow the instructions. The first dose is fairly heavy but after that just a little each oil change.
But beware!!! When you first change the oil after the CEM treatment you will get more than you expect so have a bigger than usual container to catch it all. I found that out the hard way!!
FollowupID: 748999

Follow Up By: Batt's - Thursday, Jan 05, 2012 at 14:19

Thursday, Jan 05, 2012 at 14:19
I use to do 600 to 650km before filling up my 60series that leaves a safety margin standard diesels fuel usage dosn't vary much I found until you hit the beach or bush where you have to work the motor harder other than that I find their fairly consistant
FollowupID: 749021

Reply By: Member - Royce- Thursday, Jan 05, 2012 at 08:59

Thursday, Jan 05, 2012 at 08:59
Best to cruise at 90 to 95kph.
The roof rack makes a BIG difference. If the tent is catching air it will add significantly to the fuel [lack of] economy and the speed you can cruise at. It's a bit like having a parachute out.

It is normal and comes with the vehicle.

I had my 2H changed for a turboed, 1HZ... nice improvement and since had LPG injection added which again improved things.

More to the point though. Settle back, take a half hour longer to get places and enjoy the ride.

AnswerID: 474094

Follow Up By: Gaz W - Thursday, Jan 05, 2012 at 15:04

Thursday, Jan 05, 2012 at 15:04
Yeah i know what you mean Royce.

Sit back and enjoy the ride. I dont care really if people get frustrated at me sitting on 45km/hr going up Mt Victoria in the Blue Mountains.....hahahaha.

FollowupID: 749030

Follow Up By: lntaylor - Thursday, Jan 05, 2012 at 19:15

Thursday, Jan 05, 2012 at 19:15
Hi Gaz,

Noticed the post title and my hubby & I have been travelling this past year in the same troopy - '89 2h 4l. We tow a camper trailer which kills any power we may have otherwise had.

Positives - you see a lot more of the country as it goes by so slowly! We have a running joke about trying not to get down to second or even first gear up a hill!

We've learned a lot about the new diesels being too good for our ancient hunk of metal - have improved economy with additives (sorry, hubby fishing so not here atm to ask which ones...). Had LPG fitted - does improve economy a bit but find it's a bit hard on the engine so currently disconnected.

We sit on 80kph on highway and get 16lph which we find to be decent compared to 20lph if we sat on 100kph (while towing still)!

But all in all, we've learned to take it slow and enjoy the trip not just the destination.

Hope that's a bit encouraging and that you are enjoying travels!

FollowupID: 749065

Reply By: ross - Friday, Jan 06, 2012 at 01:07

Friday, Jan 06, 2012 at 01:07
Is this 400klm measured by looking at the gauge or is it measured by distance and how much you have refiilled?
The gauge in these will often show empty when they have 150klm of fuel left.
Also tyre size can affect the odometer a great deal.

Ive found on the naturally aspirated diesels that wind resistance affects them far more than increasing the weight carried.
I bet that roof top tent is costing you 2-3 litres/100klms
AnswerID: 474173

Follow Up By: Gaz W - Friday, Jan 06, 2012 at 19:15

Friday, Jan 06, 2012 at 19:15
Hi Ross,
Yeah its just looking at the guage. I never want to risk running the tank dry so i switch it over when its pretty much on the empty line.

Thanks for your thoughts.

FollowupID: 749179

Follow Up By: ross - Saturday, Jan 07, 2012 at 10:53

Saturday, Jan 07, 2012 at 10:53
How many litres does it take to top up the tank when you refill it at 400klms.
This is the only real way to judge fuel consumption.
FollowupID: 749202

Reply By: dermie66 - Saturday, Jan 07, 2012 at 16:15

Saturday, Jan 07, 2012 at 16:15

The 2H motor will take you far, not fast. Its got plenty of power, it just doesn't’t get it to ground quickly.

I’ve got a 1988 HJ75 with a 2H, bought it at auction ex State Govt in 1990, don’t think it had ever been offroad. As others have indicated if you treat it right (clean oil, clean coolant and right oil grade) and drive it right (2000-2200rpm) it may need to be knocked down a few cogs to get up the hill but it will get you up that hill everyday for a very, very, very long time.

I still get 11-12L/100k unloaded on bitumen or good gravel and never exceed 14L loaded no matter what the surface. I’ve certainly heard from reliable sources that a larger bore exhaust and headers will get your speed up quicker without problems but have observed those who fit aftermarket turbos to the 2H have persistent troubles. Main problem the way some people drive them is over-fuelling degrades the engine oil.

As others have said, keep the speed down, only needs to be 90 instead of 100 and expect 0-100km/h in about 2-3 mins (with a good tail wind and maybe a bit of down slope). Like the EH Holden I had when I was a kid, I’d love to get another one of these now straight off the production line, it would outlast me. Unfortunately it would also have to be at the 1988 price to keep SWMBO happy.

AnswerID: 474289

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