O.K. Norm I'll engage. Not sure you understood some of my suggestions so I will try to clarify............
Quote:
Originally Posted by 88 coupe
It has already been determined that it overheats on the highway, which means that it is not an air flow problem.
|
What kind of logic is that? It overheats on the highway so the airflow is not a problem? Enlighten me please?
Quote:
Originally Posted by 88 coupe
Quote:
Originally Posted by gibbo69olds 
........ If the supply hose to engine is significantly colder than the return then the coolant is staying in the radiator too long ........
To the contrary: The cooling media is only significantly cooler when the entire system is working properly. |
You quoted gibbo69olds when it was actually I who said that - probably an honest mistake - just wanted to point it out.
Quote:
Originally Posted by 88 coupe
Quote:
Originally Posted by a911sc
........ I think you said you have run a 160 ........
And he also said, it was working properly.
Quote:
Originally Posted by a911sc
........ Have you ever run without a thermostat. Might be worthwhile as the flow should be greater as well ........
And that would prove what? |
What is the return coolant temperature - he needs to measure that to confirm the T/S is indeed opening at 160* or 180* or whatever he thinks is in there. Running without a thermostat should increase the flow. I say "should" because he could have restricted flow or crappy water pump or something along those lines. I was just suggesting another data point to try to narrow down a flown problem.
Quote:
Originally Posted by 88 coupe
Quote:
Originally Posted by a911sc
........ vacuum advance can be connected to either manifold vacuum or ported vacuum ........
There is no reason logical reason to use direct manifold vacuum.
Quote:
Originally Posted by a911sc
........ Manifold vacuum will give full advance at idle ........
Poor substitute for an optimal initial setting.
Quote:
Originally Posted by a911sc
........ then will drop off and come back up as the engine is revved ........
Exactly the opposite of what is needed.
Quote:
Originally Posted by a911sc
........ ported vacuum will be zero at idle ........
Right where it should be. |
I agree. However, if you do some searching on this site and other Oldsmobile sites you will find many who swear by manifold vacuum for the advance.
Quote:
Originally Posted by 88 coupe
Quote:
Originally Posted by a911sc
........ then will gradually increase as the engine is revved ........
Not even close.
As soon as the throttle is opened, both ports draw vacuum from the same intake manifold.
Quote:
Originally Posted by a911sc
........ I don't think one is significantly better than the other ........
Not even close. |
I disagree. Ported vacuum will vary depending on the throttle plate opening. Ported vacuum will not be the same as manifold vacuum as soon as the throttle is opened. With small throttle openings ported will remain closer to zero than manifold.
Quote:
Originally Posted by 88 coupe
Quote:
Originally Posted by a911sc
........ I have been fighting a pinging problem and have been playing with different advance springs ........
Interesting topic for a new thread. |
I would like that. As soon as I get some more data I'll start one.