Lotus Elan

Dry sump to wet sump conversion - question!!

PostPost by: Simmie C » Sat Jun 08, 2024 7:11 pm

Hello All,
I have bought a striped down twin cam. The guy I bought it from was preparing it to race, so it's been ported/skimmed/race cams etc...
It all looks good (apart from a crack in the timing chain case). With it came a spare wet sump.
I wish to use the car as more of a touring car than a race car. However, the engine was too good to miss up.
I want to fit the wet sump but the rear seems to be too large (see pictures. I know there are different types of rear oil seal housings depending (I believe) on if it's 4 or 6 bolt Crankshaft. Could anyone look at the attached photos and tell me what I will need to allow the sump to be fitted? Or even of it is the correct sump for the block/engine!!
Thanks
Simon
Attachments
Screenshot 2024-06-08 195503.png and
Wet sump
Screenshot 2024-06-08 195422.png and
Dry sump
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PostPost by: ncm » Sat Jun 08, 2024 7:48 pm

Hi Simon, As you suspect that is the wrong sump for your crankshaft. You require a '4-bolt' sump such as this item on ebay :- 196265865105.

Brian.
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PostPost by: Simmie C » Sat Jun 08, 2024 8:03 pm

Hi Brian,

Thanks for the reply, I thought that would be the case!!!
It leads me onto another question.
If the 6 bolt crankshaft is better and I have a later block and I need to buy another sump anyway.... is it best to replace all 3 (crankshaft+oil seal housing+sump)?
I've heard the cork seals are a pain and the 6 bolt a better crank?
I want to keep the car for quite awhile (retirement plans) so spending a bit now may save in the future.
Thanks
Simon
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PostPost by: ncm » Sat Jun 08, 2024 8:21 pm

If you replace the crank with a 6-bolt item then you would only need to buy the oil seal carrier as the wet sump that you have is for a 6-bolt crank.

Brian.
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PostPost by: Simmie C » Sat Jun 08, 2024 8:31 pm

Hi Brian,

OK, so the sump I have is for a 6 bolt crank.
Great, I'll look into prices of cranks and oil seal housings (I know SJS do one for about £18.00) and compare.
Do you think there is a market for a secondhand dry sump and pump? As they will become surplus to requirement.

Simon
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PostPost by: Stagmatt » Sun Jun 09, 2024 8:58 pm

Hi Simon,
just happened to see your post. I could offer a solution: I have found a 4-bolt sump in good condition but would need a 6-bolt type. Reason: on the car I acquired short time ago a dry sump system was fitted. That is not what I want. Any sumps in decent condition are hard to find so I accepted this one and the need to modify it to suit my later engine.
Let me know what you think or write a pm.

Cheers, Matthias
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PostPost by: rgh0 » Mon Jun 10, 2024 4:11 pm

HI Matthais

Was great to drive your new Plus 2 the other day. :) Needs a little work to get the handling right and the paintwork needs redoing but the engine appears sound and pulls well across the rev range. A very nice buy overall :) . Your 5 speed conversion is a very elegant modification of a Ford 5 speed box and certainly needed with a 3.55 or lower diff for the German autobahns where 140 kmh is the minimum in the fast lane and my little Kia Picanto is working hard at that those speeds. Seriously looking for a Lotus to keep in Germany ;)

If getting rid of the current dry sump you need to think about sump bafliing and that I can help wth. Modifiying a 4 bolt sump to a 6 bolt sump is not beyond your level of capability from what I have seen. Certainly 4 bolt sumps are easier to come by in Europe and much cheaper. I think Col Croucher at Elantrikbits does a write up of the conversion. I have a conversion sump that he has done for me based on what I helped him with and it is perfect compared to the original 6 bolt sump but freight cost to Europe is expensive, but I know he has done some for people there.

cheers
Rohan
(Now back in Australia for a couple of months after a very couple of wet months in Germany)
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