Running car without coolant for 1 minute....
06-29-2006, 09:28 PM
#16
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Oh, one more thing. There typically is some coolant left in the block and converting that to steam takes a lot of calories giving you a “thermal buffer”, some extra “dry running time” and another indicator when to stop, namely when steam begins to show up.
06-29-2006, 11:52 PM
#21
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Yeah, yeah. . . How do you know if a 911 is out of oil? It stops leaking. I've heard 'em all. 
To be fair I have my 911 and a 951. Love 'em both but for different reasons.
That's an interesting idea/theory though. . . Only problem is I think the leaks tend to favor the newer, cleaner oil and leave the older, gummier, sludgier stuff in the engine!
To be fair I have my 911 and a 951. Love 'em both but for different reasons.
That's an interesting idea/theory though. . . Only problem is I think the leaks tend to favor the newer, cleaner oil and leave the older, gummier, sludgier stuff in the engine!
06-30-2006, 01:26 AM
#23
Rennlist Member
On my 1st 944, I stopped doing oil changes. Only filter changes. I had to add a quart every 350 miles once the air/oil separator seals went and it got stolen before I ever got around to fixing it.
I park at my gym in the same spot every day - it's the filthiest parking spot in the lot.
I park at my gym in the same spot every day - it's the filthiest parking spot in the lot.
06-02-2018, 04:35 AM
#24
Resurrecting this old thread as I have identical question. I'm planning on starting the engine for around 60 seconds to see if it leaks and if it runs properly in general. I don't think I'll overheat it however I'm concerned about the water pump. Engine was fully rebuilt so it is dry inside, there are no traces of old coolant in the system, including water pump (rebuilt as well). Am I going to hurt it?
06-02-2018, 04:47 AM
#25
Race Car
Resurrecting this old thread as I have identical question. I'm planning on starting the engine for around 60 seconds to see if it leaks and if it runs properly in general. I don't think I'll overheat it however I'm concerned about the water pump. Engine was fully rebuilt so it is dry inside, there are no traces of old coolant in the system, including water pump (rebuilt as well). Am I going to hurt it?
06-02-2018, 09:50 AM
#27
Rennlist Member
I would have dry started it without the (external) belt just to see if it fires up. Run it for maybe 10 seconds. Then fill with water and run it for 5 mins. Last step is coolant.
EDIT: as thomasryan pointed out, the pump has to spin by the timing belt. I was thinking of engines where the water pump is driven by the serpentine (external) belt.
EDIT: as thomasryan pointed out, the pump has to spin by the timing belt. I was thinking of engines where the water pump is driven by the serpentine (external) belt.
Last edited by Mike Murphy; 06-02-2018 at 10:39 AM.
06-02-2018, 10:38 AM
#29
Rainman
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I've done it on 944 and Subarus, just to check that it runs and that something wasn't missed in reassembly.
Keep it short, enough to let it catch and run and so you can see/hear/feel how it idles. 20 seconds tops, heat builds up fast.
Keep it short, enough to let it catch and run and so you can see/hear/feel how it idles. 20 seconds tops, heat builds up fast.