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coolant/backfiring

 
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maireeka  



Joined: 29 Aug 2004
Posts: 299
Location: North Alabama
PostPosted: Wed Apr 20, 2005 8:56 am    Post subject: coolant/backfiring Reply with quote
totally unrelated questions.

1. If my coolant res. needs topped off, do I have to use coolant or can I just put a little water in there? It's not dangerous, the car cools off very well, it just needs a little more.

2. I get a little backfiring when I get off the throttle when revving/driving/anytime. It's real subtle, but needs to be fixed. Is ignition timing the most likely culprit?
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numbbers  



Joined: 05 Nov 2002
Posts: 1910
Location: Highlands Ranch, Colorado
PostPosted: Wed Apr 20, 2005 9:17 am    Post subject: Reply with quote
As long as it is not below frezzing, water is a better coolant than antifreeze. In your climate, it probably doesn't get below freezing very often, so, toping off with water should not cause a problem. The water will quickly mix with the coolant, and not dilute it much.
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maireeka  



Joined: 29 Aug 2004
Posts: 299
Location: North Alabama
PostPosted: Wed Apr 20, 2005 9:33 am    Post subject: Reply with quote
cool, so it's okay even to use straight water during the summer?
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tj924  



Joined: 15 Jul 2004
Posts: 957
Location: Toowoomba, Queensland, Australia
PostPosted: Wed Apr 20, 2005 10:41 am    Post subject: Reply with quote
maireeka wrote:
cool, so it's okay even to use straight water during the summer?


Yes, but according to others on the board, use distilled water rather than tap water (minerals from the water will get deposited in the engine) or demineralised (will pull minerals out of the metal in the engine).

Also bleed the system again any time you remove the cap (remove the cap & bleeder plug, top off with water or whatever, replace the cap, start the engine & run at around 1500 rpm until coolant is running steadily from the bleeder hole, replace the bleeder plug).

I've also seen a few people talk about "water wetter", but I've never used it.
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Smoothie  



Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
PostPosted: Wed Apr 20, 2005 11:26 am    Post subject: Reply with quote
I wouldn't go with straight 100% water except in an emergency. Antifreeze also serves as a coolant and raises the boiling point above waters' usual 100°C/212°F. Approx. 30%-50% of what's in the cooling system should be antifreeze/coolant, depending on your climate. Adding water only to an antifreeze-water mix is generally ok to do, but it dilutes the mix, so obviously if it's done too much you'll lose some of the boilover protection.
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tj924  



Joined: 15 Jul 2004
Posts: 957
Location: Toowoomba, Queensland, Australia
PostPosted: Wed Apr 20, 2005 11:36 am    Post subject: Reply with quote
Smoothie wrote:
Approx. 30%-50% of what's in the cooling system should be antifreeze/coolant, depending on your climate


The coolant I use recommends 25% coolant to 75% water.
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Roger  



Joined: 06 Jan 2003
Posts: 1235
Location: Cordova, TN
PostPosted: Wed Apr 20, 2005 1:07 pm    Post subject: Reply with quote
If it just needs to be toped of then water is fine. However you do not want to dilute the mix too much, but a little water wont hurt.

Backfire is usually caused by a lean fuel mixture
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924zombie  



Joined: 02 Oct 2004
Posts: 52
Location: cold old UK
PostPosted: Wed Apr 20, 2005 6:13 pm    Post subject: Reply with quote
Anti-freeze is also a corrosion inhibitor,if you have your car with just water in the cooling system it starts to corrode the aluminium head.
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