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Esprit Turbo project car - part3 - the further continuation - Page 249 - Esprit 'Project & Restoration' Room - The Lotus Forums #ForTheOwners Jump to content


Esprit Turbo project car - part3 - the further continuation


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There is a great deal of information to be found on the forum, "SpeedTech", hosted in America. A very recent discussion was graced with what I find to be the most comprehensive summary yet offered in any such thread. Will attach a link in the next submission.

From all I've read to date I'd go with Valvoline VRP synthetic 20W-50.

Cheers 

https://www.speed-talk.com/forum/viewtopic.php?f=1&t=62098

Review comments from member RDY4WAR in particular.

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3 hours ago, drdoom said:

There is a great deal of information to be found on the forum, "SpeedTech", hosted in America.

The choice of oil is missing a very good option in the USA though, Mobil1 10w-60. This was discontinued in the USA but still available in the UK. Note the Mobil advert above (video states its a paid-for promotion) does not mention this as it is from the USA.

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This is one slippery slope topic, no pun intended. I thought about Valvoline VR1, “Street” version & NOT the “Racing/not for street use” type, for the latter didn’t have the appropriate detergents to allow normal drain intervals. Used Street VR1 it in my 911sc, it was OK, using Brad Penn 20w50 partial syn. in her now, tends not to seep as much in the air cooled. I’m using Red Line 10w60 full synthetic in my ‘84 Turbo Esprit & really like it, easier starts & seems to ignore hot summer temperaments by keeping solid, steady temps with or without A/C on., plan on staying with it. Mind you, I’m sure price & availability is a factor for many, I’ve used Mobil 1 20w50 full syn. In the Esprit & think it’s not what it used to be, still very good but for the money wanted better hot temp. protection. Too much ZDDP & not enough appropriate detergents can be a bad thing too. I know the sweet spot for the 911 is around the 1200 to 1300 ppm & that’s what the Brad Penn delivers, but for the Esprit I’m still trying to figure what that # is, so in the meantime I’m doing shorter intervals for piece of mind. Trusted Charles Navarro’s experienced thoughts on the Porsche for his recommendations over many forums. Had Lucas 10w60 in Esprit before but added Red Line ZDDP supplement to bring it up to 1300+ ppm, some motocycle oils have slightly more ZDDP & lots of classic car flat tappet owners seek those out. I suppose it boils down to lots of things that an individual is just simply comfortable with be it price, availability, correct viscosity & application. Of course modern oils have had great improvements over the decades & suppose the basics like proper drain intervals shouldn’t be ignored because there’s no magical oil that stays clean without changing it. I apologize in advance for a lengthy post 😜

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Engine Tuning

I finally got to the bottom of the engine stumble at 2600 rpm. Its not the idle jet size or the pump jets, its the ignition timing! The distributor I have does not have the correct advance curve. The timing at 3500 rpm is correct, but this puts the idle timing off. Most people would probably think its fine. The solution is to replace the distributor with a solid state system and have a sensor ring welded to the crankshaft pulley or find a company that can set up the advance curve on the distributor, so its correct at idle and 3500 rpm.

I know upping the idle jet size has been touted on here as a solution for some years. I am now not convinced. I would exercise caution when increasing jet size make sure its not so rich you get unburnt fuel getting into the oil! The factory jetting is correct, so if the engine is stumbling with a 40 jet something else is wrong. ie. jet blocked with varnish, float height, pump jet setting, blocked carbs or ignition timing to name but a few! 

 

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At the end of the day these setups will never be 100%. The weight and spring advance curve is never perfect and carb fuelling is never spot on.

The only way to get things absolutely right is to use EFI with ignition which has feedback from O2 and MAP and temp sensors etc. A no-feedback system on older cars will be susceptible to fuel differences, temperature changes etc.

BTW I am not advocating an EFI conversion! I did that on an Excel in the past and it was a money pit and never really delivered as expected. Its better to get things as good as possible with carbs even if not perfect IMHO.

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Once Covid is over take a trip to Deezerland. Remember Miami motor museum had the Bond collection, well some of it has been moved to Orlando. Deezer Action Park, awesome cars in the collection. Heres a preview...

www.youtube.com/watch?v=dkxN39Vqd-Y&feature=

 

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  • 2 weeks later...
On 29/09/2020 at 18:37, drdoom said:

Andy, I'd be pleased to hear of your experience with the Excel EFI conversion so if it suits you perhaps a new thread over on "Engines . ."?

It was such a long time ago, I cant remember a lot of it. I remember the biggest issues were installing a recirculating fuel system (Turbo Esprit already has that!) and the cold-start idle air was never right. The system I used was called SDSEFI and amazingly is still available. I believe there are better systems available these days, it was very "hobbyist" and the ECU and coil units looked like they were made in someones bedroom.

I used Weber throttle bodies to replace the carbs, that part was pretty neat.
It turned out to be very expensive and with hindsight I should have simply had the carbs re-jetted. What I didnt know at that pre-internet time was on the very late Excels Lotus has to deliberately under-jet them to get them through emission controls so they had flat-spots and hesitation from the factory which could be corrected.

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Interesting and not at all surprising, that note regarding the late Excel jetting. I am familiar with the SDS approach, a most rudimentary digital EFI/spark solution that nonetheless has its merits. Thanks for the reply.

Cheers 

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7 hours ago, LOTUSMAN33 said:

Fabian’s in print ! 😎

Fantastic write up and the 2CV looked magnificent 😂

No seriously get your copy as very good and the Esprit looked really good in glossy print 👍

 

8CA86826-BC50-4389-BD7E-909558B858A4.thumb.jpeg.2b37ea38da40c469de4b1ab171f11f00.jpeg
 

Dave :) 

Wow, I hadn’t seen that yet!

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