Date: Fri, 18 May 2012 13:31:25 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Questions/Advice Needed 1980 VW Westphalia
In-Reply-To: <CAHTkEu+A6YEVEohr2ovr6GR3RaiK1umAdhx3YUKmRM4LFW7CCg@mail.gmail.com>
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Don ..'coolant' ...?
There usually isn't any liquid coolant in an air-cooled 1980 Vanagon
engine.
( though if it was built really well it could have sodium-filled exhaust
valves )
All air-cooled VW engines need to be kept spinning at a fairly good rate
when load is high ..such as in hill climbing ..
as engine cooling air flow is directly related to engine rpm.
that would be like 3,800 t0 4,000 rpm is far better than 2,800 rpm, for
example, climbing a hill.
a barely related interesting, I think, note..
a convertible VW Bug with the top down, at speed, like say 70 mph on a
hot long California freeway grade, overheats, badly even, due to
blockage of good air flow to the engine by the folded top .
Now there is a vehicle that could use an oil temp gauge all right.
scott
turbovans
On 5/18/2012 8:58 AM, Don Hanson wrote:
> Right, but lugging the motor on climbs or slow driving, that diminishes
> the internal coolant flow, which IS directly rpm-related. Lugging also
> diminishes the oil pressure and it's flow rate.
>
> The amount of 'force' required to move the van, that remains equal no
> matter what the rpms, but when you lug a motor down, you have to supply
> that same amount of force with fewer (but bigger, harder, more stressful)
> 'splosions against the pistons and rods and bearings. Add to that Big Bang
> the fact that there is slower coolant flow and therefor less heat
> exchanged at the radiator. In conjunction with the lower oil pressure and
> flow, you have a recipe for increased bearing wear, burned pistons, worn
> rings and possible overheating...
>
> Don Hanson
>
>
> On Fri, May 18, 2012 at 7:23 AM, Mike Miller<mwmiller6@att.net> wrote:
>
>> I thought all vans had electric cooling fans which were unaffected by
>> engine speed?
>>
>> Mike
>>
>> On May 18, 2012, at 3:11 AM, Dennis Haynes wrote:
>>
>> Especially for the air cooled engines you should not really be doing
>>> extended climbs at low RPM. Down shift and let it rev. Lugging (when
>>> increasing throttle does not increase speed) causes this engine to
>>> heat up
>>> quickly and low rpm also means low cooling fan output. You need to
>>> determine
>>> if your problem is loss of fuel or ignition. I believe your 80 still
>>> uses
>>> ignition points and condenser. A bad condenser can cause loss of
>>> spark and
>>> be affected by heat. The loss of spark from the points-condenser also
>>> effects the operation of the injectors.
>>>
>>> For the auxiliary air regulator these hardly ever go bad. Check to
>>> make sure
>>> it is in fact getting power and check its resistance to determine
>>> that the
>>> heater is not open. Be sure the wiring is not switched with the cold
>>> start
>>> valve or thermal time switch. This device was used on a lot of
>>> vehicles. You
>>> should be able to get something close or a good used one.
>>>
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