Hey all, can anyone tell me what is the standard size of a 308 water pump pulley?
Reckon mine is too small compared to crank pulley.
Would explain why she runs warmer than it should and why fan belt is shorter than standard.
Posted 31 December 2017 - 12:21 PM
Hey all, can anyone tell me what is the standard size of a 308 water pump pulley?
Reckon mine is too small compared to crank pulley.
Would explain why she runs warmer than it should and why fan belt is shorter than standard.
Posted 31 December 2017 - 02:52 PM
There are 2 basic styles of V8 water pump pulley. The larger one is made of pressed steel, while the smaller diameter one is machined from billet.
The smaller (solid) one was usually fitted to factory air/cond cars. It makes the water pump & fan spin faster therefore reducing heating, not increasing it.
If your engine is suffering from overheating, first of all very that fact, i.e. use a good thermometer, don't trust the gauge on the dash.
When does it get hot, in traffic or at speed ?
Dr Terry
Posted 31 December 2017 - 04:22 PM
Posted 01 January 2018 - 09:37 AM
OK, the first thing to determine is how 'hot' it is. What temp does is sit when cruising & what does is rise to in traffic ? The fact that it doesn't get hot at speed means that the water pump, radiator & the cooling system in general is working OK.
Getting hot in traffic is usually caused by a fan airflow issue, or tuning.
A few questions come to mind.
Is the engine bog stock, or does it have a mild cam or similar ? Is is an ADR27A model ?
You mention the viscous fan, is it working properly & do you have a matching fan shroud ?
Dr Terry
Posted 01 January 2018 - 10:48 AM
Posted 01 January 2018 - 01:15 PM
Sits at between 1/4 to 1/2 cruising and 1/2 to 3/4 in traffic depending on outside temperature.OK, the first thing to determine is how 'hot' it is. What temp does is sit when cruising & what does is rise to in traffic ? The fact that it doesn't get hot at speed means that the water pump, radiator & the cooling system in general is working OK.
Getting hot in traffic is usually caused by a fan airflow issue, or tuning.
A few questions come to mind.
Is the engine bog stock, or does it have a mild cam or similar ? Is is an ADR27A model ?
You mention the viscous fan, is it working properly & do you have a matching fan shroud ?
Dr Terry
Posted 01 January 2018 - 01:49 PM
Posted 01 January 2018 - 02:29 PM
Thanks Mark,What temp thermostat are you running? 1/2 is about 80 deg and 3/4 is approx 90 deg as a rough guide,( if I remember correctly, and are you using the correct sender?) but as Dr Terry stated ,you should try another temp gauge for confirmation of your sports dash. Or at least a temp gun.
Regards Mark
Posted 01 January 2018 - 04:51 PM
I think the cam is your problem. Every engine I've ever tuned with a 'mild' cam has overheating issues at idle.
The cam makes the engine more efficient at revs, but less efficient at idle. The dyno tuner guys don't usually worry about idle settings, other than mixture adjustments. You could try running full manifold vacuum at idle, that can quite often cure the problem. If your car was a pre-ADR27A with auto trans, that's the way it came from the factory.
You will need more airflow at idle. Assuming your viscous fan is working properly, adding a couple of electric fans will be the easiest fix. Wire them to a thermo switch plus the brake light switch so they will always come on while sitting in traffic.
As the others have said part of your problem is the fact that 160F is a bit too cold & you are noticing the rise from that point to a normal 180F as part of your 'temp rise'.
Dr Terry
Posted 01 January 2018 - 05:20 PM
Posted 01 January 2018 - 07:22 PM
Yeah I'm not really a fan of 160F thermostats. Depending on your cam & carby combination, it could cause dramas in mid-winter low ambient temps.
Dr Terry
Posted 01 January 2018 - 09:02 PM
Posted 13 January 2018 - 07:57 PM
I've done some work graphing the real engine temperature on a LH/LX gauge. Assuming you have the VDO sender, part 360.003. (Blue ring, but check part # to be sure)
40oC - 73 Ohms - Start of gauge range
93oC - 24 Ohms - Half way on gauge range
100oC - 17.5 Ohms - Two thirds of gauge range
120oC - 10 Ohms Top of gauge range
If you have the original Holden sender or the RSP/Kingswood Country sender then these readings may be different.
If your sender is old then these readings may be different.
Anyway people above know what they are talking about.
Go to 180 thermostat, see if you can check the viscous fan and re-position with 1/3 of the blade width sticking out. Run full vacuum to distributor.
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