toyota purchase

Hi brian ,In my opinion the fitting of bonnet scoops forward or backwards does not cool the motor in any significant way.The original idea of a bonnet scoop was to force air into a carburettor,nothing more.The amount of heat that an engine sheds through ventilation is minimal and its the radiator that really does the work.I know when an engine overheats and you turn it off and lift the bonnet it cools down quicker but thats because its stopped producing heat.It would be best to cure the root cause of the overheating.It could be the fan clutch or a blocked radiator.A fan clutch can be topped up with silicon or have its spring replaced cheaply otherwise a new one is about a $150.A new radiator runs into $500-$600 although there are cheaper versions around.Im getting my radiator flushed this week and radiator shop said in their experience it is a waste of time and money repairing them if they have seepage .

Being an 87 model I will assume that it is an 2H motor.The main difference between this and the factory 12HT turbo version is the compression ratio which is slightly lower.I dont remember how much but if it was set up by an expert it wont be a problem.Generally turbo charging a diesel is about the most reliable performance mod there is. The only diesel I know that didnt like it was a particular Nissan Patrol which was modified by the dealerships .When it failed, Nissan refused to honour the warranty.

One important thing on a landcruiser to check is the output flanges on the transfer case.Put it in neutral and see if there is any play by grabbing it firmly between both hands and moving it up/down/sideways.If there is movement it may be accompanied by an oil drip.Movement means the bearing,which is only $25, may have damaged the internals which can cost $1800 + labour.At 300k it would not be unusual.

Check behind the front wheels for a mess on the swivel joints.If the mess is there it means the seals have gone and will require a complete strip down of the front axle which costs about $550 which is mainly labour .It has to be done every 100k I think.

Im not trying to turn you off a landcruiser but letting you know they can cost big money to fix if the maintenance is neglected.I bought my 88 73 series mwb for $3500 unlic ,blown clutch ,no brakes and $5000 later Ive got a very nice vehicle with all the good work done,slightly overbudget ,but satisfied.

Hrm.. I haven't heared a bigger load of clap-trap in all my years as an engineer!

The mounting of bonnet-scoops to vehicles was done back in the yearly 30's as a simple way of forcing air into the engine bay, to cool the engine cylinders. Very early Citroen cars were rear-engine systems and were air-cooled.

What the guy with the GU scoop is trying to do is enact the "Venturi principle", in which, when air travels across an opening at any given angle, a small vacuum is created. In this example, he is trying to "suck" air out of the bonnet. This isn't very effective and you would find that if you put packers under the bonnet hinges and left a gap closer to the windscreen, the effect would be better.

My suggestion is to have the scoop rotated 180 degrees, so that it is forcing air down into the engine bay. As the vehicle is travelling at speed, air is being forced into the scoop and is cooling the engine down on the hot side of the block, presuming that the scoop is mounted on the hot side that is!

A Turbo-charger system, when PROPERLY installed, is a fantastic thing to have. The 1HZ engine is a fantastic candidate for turbo-charging and really shines when a modest boost level is given to it. I have seen club-members with 1HZ troopies, that have a DTS or similar system fitted, that are running 4-6PSI of boost and are getting fantastic power and economy gains from such a system.

Another problem is that getting INSURANCE for it may be a battle, considering that he's only 19 and will get treated like dog bleep by insurance companies.

chrisfrd.

Just to pick up on a minor point mentioned by Ross - the 12H-T is a LOT different to the 2H. It has a totally different cyl head with ceramic valves, its direct injection, so doesn't have glow plugs, has different cooling channels in the block and different pistons, tolerances etc etc. The 12H-T is a much, much better motor than a turbo'd 2H.

Turbo'd 2H's were more prone to overheating especially on Troopies.

Hi Brian
The addition of a turbo is a good thing if it is set up to give a small amount of boost to the 2h. Try to get petrol performance from it by boosting 11 psi and it will fail.
The factory t/d is as mentioned earlier, heaps different internally to the 2h, and would be my pick of the two if i had the extra $$ to get it.
The scoop - well i think enough has been said about it .
I hasten to point out you were not saying it has overheated, but asking would the turbo make the motor overheat, and the answer is no/yes
No not if it is set up properly and the cooling system (radiator/waterpump) is in good condition
YES if the turbo is overboosted to get those ellusive extra horses,or if the cooling system is not up to the job. and by the fact that the scoop has been added, it seems like the chances of it having overheated earlier have risen.
MMMmmmm factory turbo 60 series are cheap at the moment.....first model was the 85 hj61
Happy hunting
Andrew
wheredayathinkwer mike?

just a thought .....didnt a turbo just get fitted.......is it intercooled.......maybe the scoops there for the intercooler....as in the gu patrols...why in the hell you would face it backwards though baffles me can you see an intercooler mate..........oh and by the way venturi effect is as the engineer says im afraid that other fellow is wrong.....

Thankyou for the replies i have just checked with aami re insurance advised that nobody will offer comprehensive insurance because the turbo is aftermarket ,so i will have to keep looking.BTW if no turbo i was quoted approx$1745 per year because my son is under 20yo.

there's nothing wrong with bad women and good times and they tend to be cheaper than 4WDs ;)