free hit
Brandt's Content - The Lotus Forums #ForTheOwners Jump to content


Basic Account
  • Posts

  • Joined

  • Last visited

Posts posted by Brandt

  1. Hi Everyone

    To echo Michel's question: I'm also considering going with an electronic timing system for my '83 Turbo Esprit. Due to the 4 throttle bodies, I heard it is quite difficult to get a clean MAP reading. What have you guys out there done to get by this problem? Where did you place the MAP sensor on your systems?

    Kind regards


  2. Hi Everyone

    The seat on my wastegate exhaust manifold is quite damaged, so I took the wastegate and manifold off to the macine shop for repairs.

    In all this I found that my almost new diaphram had been seriously damaged, as I believe fuel somehow ended up inside the wategate, and that the fuel ate the diaphram.

    The point is, the guy at the machine shop suggested he makes a piston with sleave for the actuator, with a nice teflon seal. I'm very tempted by this (well, Synaps Engineerign makes wastegates like this), but I'm concerned that the aluminium bits of the wastegate runs too hot for the teflon (The max temperature spec I found for teflon is 260

  3. Hi Everyone

    Wel the Lotus is all assembled again, but it still has the misfire ;) . I can clearly see the backfire through the carbs at this time. And all the cylinders are spitting.

    So I took the Lotus to have it dyno tuned. Unfortunately the dyno guys I went to are not too experienced on carbs, so they could not help, but they said the Esprit was running very lean, all the way to 4500RPM, at which time it switched to becoming very rich. So rich they said it was just about flooding! And they said it was running so lean at low RPM, that melting pistons is a possiblility.

    All the jets are as specified by the manual, well so I thought.

    When I got the car back home I rechecked all the jets, and found that the needle jet was a 150 (on both carbs), instead of a 200 as specified. All the other jest are the correct size. I took the carbs apart and checked that everything is clean and no piping is blocked. This all looked good.

    Can the too small needle jet explain why the engine is running lean at low RPM? I would have thought that with a too small needle jet it would run fine at lower RPM and go lean at high RPM.

    Any ideas?

    Can ignition timing have any effect here?

    Kind regards


  4. Hi Everyone

    There's been a discussion on the Giugiaro Technical room, to see if it is possible to adjust the Trapezoidal Timing Belt with a Clavis gauge. It the only expected real difference between the setup for the Trapezoidal Timing Belt and the HTD Timing Belt seems to be the weight of the HTD Timing Belt. It is expected that the HTD Timing Belt is heavier than the Trapezoidal Timing Belt, and thus that a higher calibration frequency is required for the Trapezoidal Timing Belt.

    If I have the weight of the HTD belt, and I can measure my own Trapezoidal Timing Belt, its an easy calculation to get the Clavis frequency for the Trapezoidal Timing Belt. So, can someone PLEASE measure and tell me the weight of an HTD belt?

    Kind regards


  5. Hi Everyone

    Sitting around in the empty engine bay of my S3 Esprit Turbo I noticed the following:

    Clearly some welding needs to be done here. I'm considering using 316 Stainless rods, simply because of rust, but I'm not sure it'll work with the chassis.

    So please advice me on arc welding the Chassis:

    1) What kind of preweld surface preperation must be done on the chassis?

    2) Arc Welding; what kind of rods is best to use?

    3) Post weld: Just cover with nomal antirust paint?

    Kind regards


  6. Hi Everyone.

    The engine is out of the G-car, and I was scrubbing the engine bay a bit today. I noticed a few nicks on both the AC pipes in the engine bay. I not sure if the AC pipes are leaking or not, but I'd hate to put the engine back and discover the pipes are actually leaking. I bought the car with a broken fan belt on the AC, so I've never seen the AC working. When I disconnected the pipes form the AC compressor, I heard only a very slight hiss, so I am suspecting a leak.

    So I need advice on removing the pipes. Can anyone give advise on what needs to be removed?



  7. Jimmy, at what current are you driving the LED's?

    I'm also planning to build in some LED's (somewhere in the next year), and the idea is to place at least two 350mA LED's in the speedo and tach. I'm also planning to build an electronic dimmer, as I'm optimistic that I might need it!

    I was wonder if I should switch to red backlight or stick with green. Red for the advantage of night vision (if red really helps for nightvision!), or green for an original look. (hmm, maybe i can do both and make it switchable!)



  8. Thanks for the encouraging words Steve. I'm still surprised how smooth the engine ran, even with the misfire. So I'm sure the power increase will be very noticible!

    I actually expected a inlet valve to be sick, as the inlet manifold/carburttor insides was quite black. Can anyone explain to me why the inlet side should be black? I was wondering if the gasses inside the cylinder sometimes ignited on the suck stroke (inlet valve open), as air could enter forn the inlet and exhaust manifold during this time,



  9. Hi Everyone

    Finally the head is off. One exhaust valve is somewhat damaged for cylinder 4. See picture. Its not in focus, but gives a good idea. If you look carefully you can see the valve seat in places!


    I've also checked; the exhaust valve stems are 7mm (not 8mm), and there is no big water outlet on the front of the head, so this is definitely a NA head. But I've got a Turbo head to put in, so I'm all set.

    I think the pistons looks OK. The previous owner said he had replaced the rings. I'm seeing much fine horisontal scoure marks on the cylinders surface (I assume due to honing), but very few vertical scour marks. Am I correct is saying that it means the rings have not yet bedded in?

    (And I'm proud to say, with an engine crane it was a one man job to lift out the engine with gearbox intact!)



  • Create New...