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[iainb]

It dont it just opens earlier

[ngrainqey]

oh right so just cuts in lower down...
might be needing one of them then

thanks iain!
spelt it right now

[iainb]

Smug mode averted.

[ngrainqey]

lol!
ok for some...
i'm here trying to avoid block meltage - in theoretical terms atleast!
rather a headache...
i think i'v been making progress tonight though.
i'v found a site on the internet or two for silicon pipes!
i just need to make sure i have the right manifold with the turbo hope i get the right one or it's chop and weld time.. or splash out on a saab 3.0 turbo manifold!
and cool running thermostats are quite expensive from memory

[markey mark]

cool running stats from courtney about £38ish iirc  

[iainb]

Years ago you could buy a sleve to replace the thermostat its job was to slow the flow through the head.
 This if still available would do what you want.
 The down side is the heater would be useless except at high engine RPM.
But you would minimise the risk of over heating.
 You should consider increasing the size of the Rad as well, as turbo charging the engine will increase the temp !

[ngrainqey]

cool running stats from courtney about £38ish iirc  

rly markey?
shows my memorys shite lol!
thought they were around 80/90ish quid!
anyways i'm off to bed to dream about a turbo miggy!

[Kevin Wood]

The thermostat does nothing to the effectiveness of the cooling system. It's just there to stop the engine being overcooled. If you have a problem with overheating the thermostat will already be fully open, so the problem is elsewhere. Ditto the fans. They only protect the engine from overheating in traffic and do nothing when the car is moving at speed.

Certainly don't remove the 'stat or replace it with a sleeve. This is never the correct solution. It will result in the engine running too cool 90% of the time and won't increase the overall cooling available.

If you tune the engine to the nth degree you will find one of two things:

The radiator is not big enough to keep it cool any more.

or

The poorer cooling of the back cylinders on the V6 rears its' head.

Kevin

[ngrainqey]

The thermostat does nothing to the effectiveness of the cooling system. It's just there to stop the engine being overcooled. If you have a problem with overheating the thermostat will already be fully open, so the problem is elsewhere. Ditto the fans. They only protect the engine from overheating in traffic and do nothing when the car is moving at speed.

Certainly don't remove the 'stat or replace it with a sleeve. This is never the correct solution. It will result in the engine running too cool 90% of the time and won't increase the overall cooling available.

If you tune the engine to the nth degree you will find one of two things:

The radiator is not big enough to keep it cool any more.

or

The poorer cooling of the back cylinders on the V6 rears its' head.

Kevin

lol thanks for that kevin, i know about the issue with overheating on cyl 5 and 6 but what would actually work to cool them better besides increasing the cooland channel diametre?
also...
what do you need to bore out the coolant channels?
just take the head off and take the crank case off and stick a long and bigger drill down it?

thanks

[Kevin Wood]

As I understand it, there is a modification to add an extra coolant inlet from where the oil cooler cover plate bolts to the block. Don't know any more than that but I recall it being mentioned before.

I assume the oil cooler is removed and replaced by a plate with a coolant union on it, and a separate oil cooler is fitted. I am not sure if this coolant inlet is used in addition to, or instead of, the coolant transfer pipe at the rear of the block and, not having dismantled one of these engines that far, I'm not really sure exactly how it works.

Maybe a search would dig up more information. :-/

Kevin

[GmasterT]

Just a quick note, In drifty land we sometimes space the hinges so the bonnet is lifted slightly at the back, Dont know how well it it would look on a proper car that isnt a driftyfied datsun (the pointness of the jap machine kinda suits) but may be worth a go.

The theory (it works) is that the air can then escape out of the back of the engine, howver the aerodynamic bods then argue a low pressure point on the bottom of the windscreen, but meh to them!

Possibly a mod with the screen scuttle as a meet halfway point?

I may well end up doing it to mine if she proves difficult in drifty summer season  

[nabsim]

You can get louvres cut into the bonnet and they look good. One of the guys on vvoc had this done to his 2.5 vec. Can have a look where he had it done if you are interested.

I thought my 2.5vec has two fans on the radiator, (is auto though). I have been knows to get things wrong on a fairly regular basis though. I can check when I am at home though. If there is two is it possible to fit the fans/mounts from the vec to the Omega?

Just to add, the 2.5/2.6 vec's get very hot as there is no room at all under the bonnet. I know some people took the rubber off the top edge of the scuttle panel. This let a lot of hot air out from the engine bay but also increased cab noise.

[Marks DTM Calib]

Cant see it doing much to a good rear wheel drive car.....the air should exit down the tunnel pretty effectively and doing the spacing could worsen teh coolaing as a result.

The plastic under tray helps cooling quite a bit....

[ngrainqey]

Cant see it doing much to a good rear wheel drive car.....the air should exit down the tunnel pretty effectively and doing the spacing could worsen teh coolaing as a result.

The plastic under tray helps cooling quite a bit....

i dont have a plastic undertray on mine
lol

[Techno]

I'm sure my 2.5 V6 has two fans (infront of the rad) and one the the rear left had side, so three in all.