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Idle Water Temp

YangLIU
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MozzMann Enthusiast

MozzMann

Posted
Posted

Re Camshafts yes sorry that should have read " Moly Steel billet " Chilled Cast Iron is generally used as it is significantly more rigid and as a result flex much less and has a greater resistance to wear, induction hardening is generally used on the lobes as well.

Brick Mentor

Brick

Posted
Posted

Up to a point Higher temperatures mean more power because more energy is extracted by more complete combustion resulting in more power being produce .

We probably should all go remove our front mounts and instead heat up our Intakes for all the powaz

Duncan Grand Master

Duncan

Posted
Posted

Enough trolling thanks everyone.

Clearly any given car has a specific temp where it works best. The stock gauge in a modern car will read about half when it is at the right temp for that car. Generally newer cars are designed to run much hotter than you might think.

  • 8 months later...
KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

You'll be fine. That's why you have a pressurised radiator cap so that you can run higher temps without boiling.

But if you were not using your aircond (which heats up incoming air) you may think about getting your radiator checked sometime.

Daleo Grand Master

Daleo

Posted
Posted

Dragging this up, what is the ideal water and oil temp range in an M35? My water temp got to 104 degrees and oil to 107 degrees whilst cruising at 50-80km/hr today.

It is pretty normal; they do tend to struggle at lower speeds in hot weather.

Once you get moving, they shed heat much better.

A larger capacity radiator is a very useful thing on the NM35; along with a large transmission cooler.

Philr32 Proficient

Philr32

Posted
Posted

If you are running FMIC with thin fan. when hot weather, heavy traffic and aircon on, you may reach 110 degrees ;) that's why Japanese branded FMIC will not replace stock aircon fan.

My car is 100% standard and that already happened on 37 degree day a month ago. Well I reckon it had to be 110 because it went up over half where it usually stays.

zoomzoom Mentor

zoomzoom

Posted
Posted (edited)

To be fair, the trend towards running a hotter engine is due to reasons of efficiency, so technically more power for a given rate of fuel consumption.

But efficiency and potential to create power are different. Since you're talking max killawasps, the ability to consume fuel and release energy from it at the highest rate is prioritised over efficiency.

Edited by zoomzoom
YangLIU Rising Star

YangLIU

Posted
  • Author
Posted (edited)

My car is 100% standard and that already happened on 37 degree day a month ago. Well I reckon it had to be 110 because it went up over half where it usually stays.

over half doesn't mean it has problem. attached pic is from V35 manual. there is wide normal range. but i know you don't want to see it goes over half :yes:

post-137368-0-17955700-1452550117_thumb.jpg

Edited by YangLIU
iamhe77 Grand Master

iamhe77

Posted
Posted (edited)

Up to 90% of the gauge is considered normal? :blink2:

Crazy. I suppose that is like Nissan considering "normal" oil consumption of 2L in under 10,000kms for the original Xtrail.

If my gauge hits half way, I take a long hard look at the cooling system... which only happened once on my NM35 and never on my PNM35.

Surely 104 degrees whilst cruising is not normal. I never saw that whilst cruising in either of my Stags regardless of outside temps.

Stop-start in the NM35, maybe on a very hot day, but cruising?

I'd be looking at the cooling system. Get a bypass mod, dump the current coolant/water and fill up with new stuff. See how it goes.

Edited by iamhe77
Philr32 Proficient

Philr32

Posted
Posted

Up to 90% of the gauge is considered normal? :blink2:

Crazy. I suppose that is like Nissan considering "normal" oil consumption of 2L in under 10,000kms for the original Xtrail.

If my gauge hits half way, I take a long hard look at the cooling system... which only happened once on my NM35 and never on my PNM35.

Surely 104 degrees whilst cruising is not normal. I never saw that whilst cruising in either of my Stags regardless of outside temps.

Stop-start in the NM35, maybe on a very hot day, but cruising?

I'd be looking at the cooling system. Get a bypass mod, dump the current coolant/water and fill up with new stuff. See how it goes.

That was pretty much my thoughts...

YangLIU Rising Star

YangLIU

Posted
  • Author
Posted (edited)

Up to 90% of the gauge is considered normal? :blink2:

Crazy. I suppose that is like Nissan considering "normal" oil consumption of 2L in under 10,000kms for the original Xtrail.

If my gauge hits half way, I take a long hard look at the cooling system... which only happened once on my NM35 and never on my PNM35.

Surely 104 degrees whilst cruising is not normal. I never saw that whilst cruising in either of my Stags regardless of outside temps.

Stop-start in the NM35, maybe on a very hot day, but cruising?

I'd be looking at the cooling system. Get a bypass mod, dump the current coolant/water and fill up with new stuff. See how it goes.

no one want to see the gauge hits half way. i uploaded whole G35 manual pdf.

i have full alloy radiator, nismo thermostat. so far i can see, the more visible effect on cooling system is nismo thermostat. even at 30-33 degree weather, when cruising 50-80km/h (light traffic) without aircon, water temp stay in 78-90 degree range.

2003-Infiniti-G35.pdf

Edited by YangLIU
KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

If the temp gauge reads 110 deg then you can assume that the thermostat is fully open so a thermostat that opens earlier won't be making any difference at this point. I would also assume that if the outside temp was 37deg the aircond would be on and that produces a ton of heat right in front the radiator. It is normal for cars to run hot under these circumstances and not a cause for panic.

Reading back through this thread there seems to be some misunderstanding of Mozzman's point that cars run more efficiently at higher temps. Yes the point of the intercooler is to lower the incoming air charge as much as possible in order to maximise the amount of air but once combustion occurs it is preferable that as much energy as possible goes in to pushing the piston down rather then warming up the block. Naturally there is a limit to this but with the right oil etc this limit is higher than some seem to think.

Having said that it is always a good idea to check the cooling system on a ten year old car. Many have plastic top tanks so removing the radiator and top tank will reveal whether anything need replacing or just a flush will do it.

Daleo Grand Master

Daleo

Posted
Posted

The whole "engine running at higher temperature" isn't so much about efficiency than it is about emissions.

What you are really looking for is being able to keep the engine within a "range" whilst running; going from 78 to 110 degrees is bad, but being between 78 and 90 degrees is much better.

The closer to 100deg or over your engine runs continuously; the closer to the theoretical boiling point of a pressurised system you are. This is bad.

In Australian summer weather a stock NM35 cooling system will run between 92-110 degrees as a matter of course; I don't think this is in any way ideal. In winter they run between 82-95; this is better, but more can be done.

The reason I changed to a Nismo thermostat was because of a complete failure of the OEM one. This is very common in US market VQ engines; and routinely results in overheating and head gasket failure.

This almost happened to my car, and I know of one other NM35 that locked the thermostat closed and almost destroyed an engine.

So stay with your OEM thermostat; but I'll be happy with my Nismo thanks.

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