Pan’s Rebuilt Engine

I’m a huge fan of “easier”!
I did read that cylinder #3 gets less air than the others, leading to the mystery.
It will be interesting to compare all 4.


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Dont know whether this answers your questions or is even helpful.

I have a double sender thing that means you can have your normal oil light, plus connect an oil presuure gauge. If you fit one of these be very careful not to overtighten it as apparently you can crack your case.

My vdo pressure gauge reads in bar. Other people have gauges that measure in psi. They are just different units of measurment.

 

Ps you wont need to or want to rev it past 5k.

I rarely go over 4k revs

 

Pps i didnt notice any change in pressure gauge readings when i had long oil pipes and external cooler installed.

My pipes have an oil thermostat in line, which means the oil doenst travel all ths way to the external oil cooler until engine gets to temperature (80c i think). Not sure if this is worth having or not.

Some oil filter 'mountings' have this thermostat built into them

 

On the very early engines, yes, as no 3 got 2nd-hand cooling air from the oil cooler. If you’ve got the “doghouse” over the oil cooler on the fan shroud, there shouldn’t be any difference.

 

- a 5 bar gauge is fine. Normal pressures will only go up to about 3 bar. 7 bar is crazy.
- keep your oil warning light: get a dual sender with a switch snd gauge sender. The switch will react quicker than a gauge.
- the oil hoses will make no difference to pressure once they’re full
- 1/8” NPT is veeeeeery close to M10 x 1.0, so should be ok. Just nip it up very lightly. The taper should seal.

 

This ^. Even if you have a cooler with a thermostatically switched fan, you should have some some of diverting thermostat in the oil flow or you will over cool it in the winter and drag out warming up such that sometimes it never will.

 

80 psi = 5.5 bar, cold, just started it. It will have hit the end and in a minute would be at about 60psi. I've checked it against a mechanical gauge.

 

Are your pressure relief valves working ?

 

Dual senders for the warning light and gauge are an easy and tidy way to have both, if you ditch the switch obviously the low oil pressure warning light won’t work but the engine doesn’t care whether there is a gauge or a light, or nothing at all. Gauge accuracy isn’t critical; it’s trends you’re looking for, it doesn’t matter if the pressure is actually 3.1 bar but the gauge indicates 3.0 bar.

I avoid adaptors and use a dual sender with the same thread as the engine. Don't screw a 1/8" NPT sender into a 10mm thread, even if it is close.

You definitely need an oil thermostat; the oil will take forever to warm up without one. Even with a thermostat it will take a long time because there is always some oil flowing through the cooler - so you should be patient before you sit there revving the nuts off the engine. And don’t sit there letting the engine idle either.

If the oil pump isn’t oversize and you’re using the correct oil grade the pressure won’t get to 7 bar - unless you start a cold engine and wind it up to 5000 revs. It makes me cringe to think what you used to do to the poor little engine.

I don’t think you are fan of “easier” at all. Don’t overthink it, it’s really very simple.

 

It soon settles down and once warmed up bumbles along at 42-45 psi 1500-4,000rpm and 20psi at tickover. I expect they are in fact working but have never checked. That oil pressure used to make me cringe but 5 years on I don't notice. I don't thrash the van cold anyway.

 

Struggling to find a dual sender unit.
This is what I was looking at:

https://www.asap-supplies.com/produ...h-alarm-5-bar-euro-resistance-m10-x-1-ke21121

Just seen they do an m10 version, but the alarm is set at 1.4bar, which will surely go off too readily.
I was assuming an alarm at 0.8 bar would react faster than the current switch does.

So it’s now just a case of finding a sender and matched gauge (affordable ).


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looks like a cheapo VDO copy sender which you could get for £7 on ebay if you're going that route.
£60 VDO one 0-80psi has 6-9psi for the warning light, higher than the VW switch but more use IMO.
1.4 bar is 20psi and far too high.
0.8 is 11.5psi - still too high... IMO

edit: looked harder and 10bar dual senders everywhere but no cheap 5 bar. You do want 5 bar, 10 bar will barely twitch.

 

^this. 1.4 bar will drive you nuts.

Try and find one that isn't made by the Lucky Number Seven Fortunate Dragon Oil Pressure Gauge Company. Like VDO

 

Like this....?

https://www.ebay.co.uk/itm/Oil-Pres...-/373351463980?_trksid=p2349624.m46890.l49286

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..and this...

https://www.ebay.co.uk/itm/VDO-Oil-Pressure-Gauge-5-BAR-/303954000609?_trksid=p2349624.m46890.l49286




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Looks better, but I’d say 0.7 bar still too high for the warning light. VDO’s 0.4 bar better.

 

Looks fine to me. I’d go for oil temp first, tho’