| [ Total Views: 620 | Total Replies: 13 | Thread Id: 97217 ] |
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 ClockworkMonkey
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| posted on June 2nd, 2012 at 04:10 PM |
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warm-up times
Just wondering what you're guys thoughts are on warming up air cooled cars? I try to let it warm up for like 5 mins....is that over kill? Should you
warm up engines for longer in the cold months or is it just better to get the oil circulating for a few mins and then drive off??
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L469
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| posted on June 2nd, 2012 at 04:17 PM |
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Never needed to warm mine up.
Just don't over rev the engine for the first km or so
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 vw54
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| posted on June 2nd, 2012 at 04:44 PM |
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dont think you would have to worry too much in Brissy
more so down south
I usually let mine warm for a minute or so on fast idle then take it slowly not over reving for 2 klms or so or at least until the first red
light looking for a race off the line 
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Bob down
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| posted on June 2nd, 2012 at 04:56 PM |
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i could be wrong but i thought i read somewhere (maybe a vw manual not sure tho), that the best way to warm up a vw engine is to drive it as thats the
quickest way to bring it up to operating temp. again i could be wrong and frequently am.
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L469
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| posted on June 2nd, 2012 at 05:04 PM |
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| Quote: | Originally
posted by Bob down
i could be wrong but i thought i read somewhere (maybe a vw manual not sure tho), that the best way to warm up a vw engine is to drive it as thats the
quickest way to bring it up to operating temp. again i could be wrong and frequently am.
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pretty sure you are spot on their .both my father and his father both always used to say it was written that way in the manual
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ClockworkMonkey
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| posted on June 2nd, 2012 at 05:50 PM |
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I would of thought that if there wasn't oil circulating properly it would wear the engine quicker... I wouldn't argue with the manual though 
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 matberry
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| posted on June 2nd, 2012 at 05:59 PM |
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| Quote: | Originally
posted by L469
| Quote: | Originally
posted by Bob down
i could be wrong but i thought i read somewhere (maybe a vw manual not sure tho), that the best way to warm up a vw engine is to drive it as thats the
quickest way to bring it up to operating temp. again i could be wrong and frequently am.
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pretty sure you are spot on their .both my father and his father both always used to say it was written that way in the manual
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I agree, just keep it steady for a k or 2...
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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68AutoBug
A.k.a.: Lee Noonan
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| posted on June 2nd, 2012 at 06:02 PM |
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| Quote: | Originally
posted by ClockworkMonkey
Just wondering what you're guys thoughts are on warming up air cooled cars? I try to let it warm up for like 5 mins....is that over kill? Should you
warm up engines for longer in the cold months or is it just better to get the oil circulating for a few mins and then drive off??
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One of the selling points of beetles in the 60s was to start a beetle,
You pushed the accelerator pedal to the floor once.. this set up the automatic idle,, and with the automatic choke working, You started the engine and
then drove off...
No waiting at all...
and the engine isn't revving without a load..
its much better for an engine to be revving with a load..
and the automatic choke will turn off.. automatically..
cheers
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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ClockworkMonkey
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| posted on June 2nd, 2012 at 10:29 PM |
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I would of thought that if there wasn't oil circulating properly it would wear the engine quicker... I wouldn't argue with the manual though
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matberry
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| posted on June 2nd, 2012 at 10:45 PM |
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Oil will be circulating immediately upon start-up, well it certainly should be anyway. It's the temperature and viscosity of the oil that is the
issue, but being air cooled our engines have less mass to heat up so therefore actually come up to temp much quicker than a water pumper. They also
cool down quickly too. Then there's the issue of thermostats......
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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bajachris88
A.k.a.: Chris Leete
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| posted on June 2nd, 2012 at 10:55 PM |
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Once the oil pressure light stops glowing, you know its pumping through.
There will always be a residual oil coating on the bearings and tappets prior to start, held there by surface tension anyways.
Some car manufacturer's recommend not putting the throttle down when starting as it puts the bearings under load prior to the few seconds to build
oil pressure, vw is an exception. the older kombi manuals would tell you to bury the pedal when warm starting a donk because on some occasions the
engine plays hard to get (well... hard to start).
Regardless, cold starts will always pose some form of wear. Big thing i remember from a Ukrainian professor (engineer) we had at uni is his story of
his involvement with a certain diesel engine in a truck performing cold starts in sub zero temperatures. The wear caused to the engine from a single
cold start was the equivalent wear of 5,000 km (some drastic crazy value) of driving. Hence why this company called for his assistance back in the day
when he wasn't in the classroom to resolve the issue to ensure longevity of their assets.
vw's are a different story of course, but puts it into perspective. Dry starts cause alot of premature wear (in regards to a cold start) and i can't
see why a vw would be an exception. Most oil filters (if not all) have anti-back drain valves to prevent this, but of course the stock vw don't
doesn't have this. Dry starts often characterised by a bearing rattle a second or so just after starting. Oil additives like Lucus Oil Stabiliser
help prevent dry start wear by maintaining a sticky coating on the bearings when the engine is shut down.
I have heard from reputable resources, taht for your standard car and climate, the wear posed to a 'normal' engine doing a dry start will always be
existant but no calls for concern. The rate of wear would be minimal in comparison to the rate of wear of all other components about the engine
(valves, rings, tappets blah blah). The point of an engine warm up anyways isn't necessarily the 'oil circulating', its about letting thermal
expansion take place for all components in the engine to 'seat' into correct tolerances properly for when the engine reaches its designed operating
temperature (warmed up).
Chris.
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
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matberry
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| posted on June 2nd, 2012 at 11:06 PM |
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| Quote: | Originally
posted by bajachris88
Dry starts often characterised by a bearing rattle a second or so just after starting.
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If your engine does this it'is showing signs of excessive oil clearances in either the crankshaft bearings or lifter bores or both.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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t_tuffnut
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| posted on June 3rd, 2012 at 10:36 AM |
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On a cold morning I need to let mine warm up for about 2 - 3 minutes, otherwise it wont rev properly and it sounds like it hits a rev limiter early
and has no guts. I figured it was due to the cam and carb set up as you can hear the idle change from a really lumpy splutter to a well polished
military drumming tattoo of an idle when its warm.
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matberry
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| posted on June 3rd, 2012 at 03:00 PM |
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| Quote: | Originally
posted by t_tuffnut
On a cold morning I need to let mine warm up for about 2 - 3 minutes, otherwise it wont rev properly and it sounds like it hits a rev limiter early
and has no guts. I figured it was due to the cam and carb set up as you can hear the idle change from a really lumpy splutter to a well polished
military drumming tattoo of an idle when its warm.
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It's the tune up that is making your car need to be warmed up. Must be on the lean side, so when cold it needs more fuel and
therefore hard to run when cold as the hot tune is actually way lean until some temp gets into the heads.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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