Lotus Elan

Twin Cam - Crossflow Oil Sump

PostPost by: types26/36 » Tue Jun 11, 2019 11:24 am

2cams70 wrote:
promotor wrote:I still don't understand how that automatic type sump works as the oil pickup doesn't take oil from the front bowl, only from the rear one.


Yes - what does the inside of the sump and the oil pickup look like? South African special only. Haven't seen it anywhere else automatic or otherwise. It's not out of one of those south African AX block 1.6 crossflow Sierra's is it?

Here is what it looks like inside, I think this is the pick up for it as I just had a quick scratch around in my garage.
It was defiantly not on the 831 AX engines in the Sierra, they had the rear bowled sump.
As I said, I only ever saw it on the Automatic cars, I even put one on my TC Seven with a sump guard, the sump gave better ground clearance and I never had a problem with oil pressure when fast cornering.
I don’t have a good picture of that but here is one which does show it with the sump guard.
Strangely enough, only last week there was one on UK ebay, I copied the page but can’t seem to find it on my laptop but will post it when I find it.
Al, as I understand it, it picks up the oil from the rear bowl and when this is full it overflows into to the front bowl.
.
Attachments
scan10001.jpg and
gard.jpg and
20190611_114855_resized.jpg and
sump-and-pick-up.jpg and
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PostPost by: types26/36 » Tue Jun 11, 2019 11:40 am

Found it, it was not my ad so there are more about as it was UK.
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PostPost by: J J DIKKE » Tue Jun 11, 2019 1:28 pm

Hello
Thank you and like you I am also wondering what that small sump bowl could do and exactly how that would work.

Would the oil not simply sit in it assuming it had no second oil pickup method? Perhaps its only to keep the oil cooler in higher temperature situations.

What does anyone think?

Thank you
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PostPost by: 2cams70 » Tue Jun 11, 2019 1:46 pm

I agree that the front bowl must be there to assist with cooling. I think oil cooling must be marginal in a rear bowl sump fitted to an Escort as the sump is out of the airstream. That's probably the reason Ford fitted an external oil cooler as standard on all Escort Mexico/Twin Cams/RS1600's and also probably one Lotus did not fit one to the Elan.
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PostPost by: promotor » Wed Jun 12, 2019 7:52 am

[/quote] Al, as I understand it, it picks up the oil from the rear bowl and when this is full it overflows into to the front bowl.
.[/quote]

I got my head around that but just couldn't see a definite reason for it to sit in there, but the cooling theory makes sense. I was wondering if it was something to do with the oil pressure return from the oil pump.
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