Lotus Elan

Wrong oil pressure sender?

PostPost by: richardl46 » Thu Dec 21, 2017 9:42 pm

Apologies once again for making use of your excellent forum. My enquiry refers to a twin-cam installed in a Lotus Seven S4.
I want to connect up my heater to the take-off point on the lower front cover, but the oil pressure sender is projecting into the path of the water pipe. Should the oil pressure sender have a 90 degree adaptor or is a different sender used in this situation?
Photo attached.
Thanks, Richard
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PostPost by: MarkDa » Thu Dec 21, 2017 11:26 pm

I'd say that most elans have a direct pressure feed to a mechanical gauge, mine does have a right angle feed so only protudes 20mm off the block.
Here's what mine looks like.

dsc_0003_20.jpg and
Oil pressure and heater feed


So the short answer is that to do what you want will require a different sender or some plumbing work to get it out of the way.

For the more picky amongst us I can confirm that I've tidied up the vacuum pipes and have a period overflow bottle!!
Last edited by MarkDa on Thu Dec 21, 2017 11:30 pm, edited 1 time in total.
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PostPost by: 1owner69Elan » Thu Dec 21, 2017 11:28 pm

There are two things that allow the oil pressure take off and the heater pipe connection to not collide on my S4 Elan:

1. First of all the oil pressure take off is a 90 deg connector, but also mechanical with a thin profile, not like your apparent electrical version.

2. Second, the adapter to connect the heater hose has an angle to it away from the sender.

The pictures below show the situation:

img_8667.jpg and


heater-hose-connection.jpg
heater-hose-connection.jpg (16.29 KiB) Viewed 663 times
'69 Elan S4 SE
Street 181 BHP
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PostPost by: MarkDa » Thu Dec 21, 2017 11:46 pm

Unfortunately my take off is obscured by the vacuum pipe but it is a taper male thread take off with a tight right angle pipe brazed on attached to parallel thread union.
I believe this to be original.
It's so shallow heater pipe sails straight past.
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PostPost by: 1owner69Elan » Thu Dec 21, 2017 11:52 pm

'69 Elan S4 SE
Street 181 BHP
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PostPost by: MarkDa » Fri Dec 22, 2017 12:15 am

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PostPost by: MarkDa » Fri Dec 22, 2017 12:39 am

Maybe I misunderstood and posted low pressure switch.
Is this Smiths style sender shallow enough?
http://www.holden.co.uk/displayproduct. ... de=070.185

Other sources available.

Or is that what youve got and it won't fit direct to block?

Maybe 45? like this?

s-l400.jpg
Oil pressure elbow
s-l400.jpg (55.9 KiB) Viewed 642 times
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PostPost by: john.p.clegg » Fri Dec 22, 2017 8:39 am

I think you'll find the pipe sits tightly behind the oil pressure sender , nice and snug.

John :wink:
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PostPost by: The Veg » Sat Dec 23, 2017 4:51 pm

As another data-point, my Plus 2 has an electrical gauge that appears to be just as old as the other gauges (had them all out recently), and the sender looks as old as anything on the car too. The sender is mounted on a 90-deg fitting.
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1969/70 Elan Plus 2 (not S) 50/2036
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PostPost by: richardl46 » Sat Dec 23, 2017 5:13 pm

That's a useful photograph and confirms what I thought must be the best way of mounting an electrical oil pressure sender.
I've sent for a 90deg elbow with 3/8" BSP threads which will put the sender above the heater hose.

Another problem has arisen in my "add heater" project. The heater control valve hole in the cylinder head had been blanked off. Removing the blanking plug revealed badly corroded threads that I am now trying to clean up. I may have to stick the valve in with epoxy to make a secure job.

Thanks, Richard
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