Tell me if this is true...

Submitted: Thursday, Oct 16, 2003 at 01:46

ThreadID: 7853 Views:1644 Replies:9 FollowUps:9

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enzo

Sorry not to have posted for quite a while but I've been druming up support for my expedition. Now I've had a problem with overheating in the past but only when the vehicle is under load (Toy 4Runner 3.0 TD), now someone has now told me that this could be caused by restricted airflow due to the Safari Snorkel I had fitted. They said you could cure this either by punching holes in your standard paper air filter or even by removing it. Now I wouldn't want to remove it completely but this chap did say he get a performance gain and stopped the overheating when he did the above. Any thoughts on this? (And no, I wouldn't recomend removing the air filter completely either)
Rgds

enzo
bundubasher

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Reply By: Tony - Thursday, Oct 16, 2003 at 07:32

Thursday, Oct 16, 2003 at 07:32

G'day Enzo, I would be looking at some other cause for the overheating, There is no reason the fitting of a snorkel would restrict any airflow to the radiator, cause that is where the overheating problem will stem from, not the aircleaner.

You may have to get a radiator flush, check thermostate, hoses, heater coil and in your area get that hot air out from under the bonnet ie bonnet scoop or vents.

AnswerID: 33982

Reply By: Member - Eric- Thursday, Oct 16, 2003 at 08:08

Thursday, Oct 16, 2003 at 08:08

Punching holes in your air filter is the best way to destroy yor engine , it will allow dust to enter the combustion chamber and destroy your bores . A snorkel cannot cause a engine to overheat . Check your cooling system and clutch fan .Venus Bay

AnswerID: 33988

Reply By: enzo - Thursday, Oct 16, 2003 at 09:04

Thursday, Oct 16, 2003 at 09:04

Hi guys

Thanks for the responses - I didn't think the snorkel could cause the overheating myself only that it may "choke" the engine a bit at low speeds. I heard of this solution from a Landy owner (Disco 300TDI) and wanted to investigate it.

I changed my radiator last summer so I doubt it needs flushing already, but the fan is an OE viscous coupling type and that might need checking.

Thanks for the feedback anyway and goodluck in the Rugby, also, there should be a blinder of a game next weekend: SA vs GB! SA will definately be out to revenge the thrashing we gave them last year!

Go well,

enzo

AnswerID: 34000

Reply By: flappan - Thursday, Oct 16, 2003 at 14:23

Thursday, Oct 16, 2003 at 14:23

Why cant a snorkle cause an engine to overheat ????

One a petrol if its running lean, it can cause an engine to overheat . . . If a diesel is getting more fuel then air it would run rich which again would cause an engine to overheat . . . .

However, its unlikely to be the major cause, but certainly could add to it.

AnswerID: 34034

Follow Up By: Tony - Friday, Oct 17, 2003 at 07:34

Friday, Oct 17, 2003 at 07:34

You just said it flappan, out of tune, over fueled noithing to do with the snorkel.

FollowupID: 24542

Reply By: Luke - Thursday, Oct 16, 2003 at 15:48

Thursday, Oct 16, 2003 at 15:48

Find whoever told you to punch holes in your paper filter, or remove it and give them a severe spanking!

AnswerID: 34043

Reply By: Luke - Thursday, Oct 16, 2003 at 15:48

Thursday, Oct 16, 2003 at 15:48

Find whoever told you to punch holes in your paper filter, or remove it and give them a severe spanking!

AnswerID: 34044

Reply By: howesy - Thursday, Oct 16, 2003 at 17:50

Thursday, Oct 16, 2003 at 17:50

The most common on these Hilux is the fan hub. Over time the silicon oil gets lazy. If you check it out, most of them are serviceable and can be pulled apart. Toyota say to put two vials in it but I cleaned mine right out and put three vials in at $10 a vial. No more probs with the most load on the hottest of days and it still has enough slip to avoid he blades pulling in to the radiator on water crossings. $30 and a little bit of effort sounds like good insurance to me and at least you know it's mickey mouse then and not a contributing factor.
Good luck and take care.

AnswerID: 34060

Follow Up By: enzo - Thursday, Oct 16, 2003 at 18:38

Thursday, Oct 16, 2003 at 18:38

Sounds like a plan - many thanks for that advice.
Stay well,

FollowupID: 24522

Follow Up By: Member - Wherethehellawi - Thursday, Oct 16, 2003 at 18:55

Thursday, Oct 16, 2003 at 18:55

but doesnt a rotating fan actually retrict the air flow over the radiator if the car is moving at a speed greater than what the fan can draw air across the radiatorWow! am I cute
If yer ain't fishing, Yer ain't livin
Richard

FollowupID: 24523

Follow Up By: howesy - Thursday, Oct 16, 2003 at 19:10

Thursday, Oct 16, 2003 at 19:10

Hi there Wherethehellarewe

This would be true if the fan were a solid mount, but we are assuming that as a Hilux it has a viscous coupling on the fan to allow it to slip when the air flow through the radiator exceeds the flow of the fan.

FollowupID: 24524

Follow Up By: Member - Wherethehellawi - Friday, Oct 17, 2003 at 09:35

Friday, Oct 17, 2003 at 09:35

Is the reverse of what I'm thinking then?
"I'm thinking that if the oil gets lazy then the fan is slipping all the time and it should'nt overheat" (providing the vehicle is moving)

if its the reverse and the oil gets lazy does the fan rotate all the time?Wow! am I cute
If yer ain't fishing, Yer ain't livin
Richard

FollowupID: 24548

Follow Up By: howesy - Saturday, Oct 18, 2003 at 18:16

Saturday, Oct 18, 2003 at 18:16

Sorry to confuse you dude. the fan has to have theright amount of resistance so as it will drive . The centrifugal force generated by the hub turning under power applies more resistance in the hub thus driving the fan to pull air through. When you back off or resistance from excessive air flow or water passing through on a river crossing, the centrifugal forces in the hub are reduced making the fan less likely to drive and more likely to give some degree of slip. The degree of slip in the hub is not constant, rather it is governed by the load.
Probably confused you more now, sorry!

FollowupID: 24699

Follow Up By: Member - Wherethehellawi - Sunday, Oct 19, 2003 at 10:03

Sunday, Oct 19, 2003 at 10:03

ah ah ...i think Wow! am I cute
If yer ain't fishing, Yer ain't livin
Richard

FollowupID: 24725

Reply By: enzo - Thursday, Oct 16, 2003 at 19:09

Thursday, Oct 16, 2003 at 19:09

Apart from anything else I was thinking of adding a Pacet Powervent on the bonnet. This is a 12 inch diameter, round electrical fan extractor and should help to cool the engine / engine bay.

enzo
bundubasher

AnswerID: 34076

Follow Up By: ross - Thursday, Oct 16, 2003 at 23:30

Thursday, Oct 16, 2003 at 23:30

Enzo a lot of people talk about cooling the engine bay with extra ventilation but in reality 99% of the cooling effect comes from the radiator.Best to get to the root cause of the over heating .The snorkels should increase the airflow not restrict it.These have been worked out by engineers and released to the public after exhaustive testing.
What sort of speed are doing when fully loaded?

FollowupID: 24538

Reply By: enzo - Thursday, Oct 16, 2003 at 23:57

Thursday, Oct 16, 2003 at 23:57

Thanks for the question:

Last time I suppose the vehicle was nearly fully loaded: 2400 kg all up, plus I was pulling a small caravan, 1000 kg, but I never really went much beyond 60-70mph on tar.

But it's done it whilst I've been fully loaded, 2500kg, doing 70-80mph all on tar.

If I bumble around in 20-25 degrees then there are no real problems, but what worries my is that if it overheats in the UK when pushed hard, how is it going to perform when it's pushing 30-40 degrees outside? Are there any way of expanding the rads capacity for coolant?

Thanks for keeping me informed.

AnswerID: 34107