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Showing content with the highest reputation on 23/12/10 in all areas

  1. 1 point
    I think you'll find that box is missing at least one more hat! :dry:
  2. 1 point
  3. 1 point
    Chris Yes I have a concept for an autotensioner, but needed to finish the belt first to ensure the loadings are correct. That is nearly done but I now need an engine to play with to get the Autotensioner in the right place. I dont really want to remove the engine from the Esprit for that purpose, but my Sunbeam is already out and in bits. Problem is that the Esprit get jealous then keeps looking for attention stopping me from getting on with the Sunbeam, but it is moving up the to do list quite fast.. With regard to cam timing error, this will depend on the engine the layout and the belt used. When we set our timing we set it statically. Unfortunately when the engine is running the system becomes dynamic. In our engines, there are torsion inputs coming from the crank, eg after the spark plug fires, pressure builds and subsides in the cylinder causing different rates of angular acceleration during each engine revolution. we also see positive and negative torsional effects from the camshafts as they open and close the valves plus the oil pump is also a source of variation as the oil pressure in each part of the rotors rises and falls as part of the process. When you put all this together at the same time like it or not, each cam will see a plus or minus variation (cam ref crank) from the nominal position it was originally set as the engine cycles. I have seen variations of several degrees on some engines if a system resonance is encountered making it very important to ensure the cam timing is accurate. I have seen on engine that was set up using the correct timing tools which had seen better days (a bit worn) and the valves hit the pistons. There is sometimes as little as 5° or 6° allowable before terminal damage can become reality. Note that once the belt tension drops the potential for dynamic error increases as the magnitude of cam movement can increase. The transition from slack to tight also accelerates the damage to the belt which is why autotensioner work so well, as they limit this. With regard to the adjustable pullies, they are a good way to set the cam timing to be accurate. The cam, pullies etc are all made to a tolerance so in theory there is a lot of potential variation on the timing in addition to the above. If you set the timing to be accurate using adjustable pullies then some of the variables are reduced Regards Ralph
  4. -1 points
    Even though being a full blooded, bull headed kraut, I never liked Porsches as I also consider them a "flattened Beetle" design wise. (no wonder, both got the same midwife) I must say though that they deserve where they are, due to their perseverance and their strictly followed company philosophy. I don't know of any other car maker which is able to make just one model always look different yet exciting and still keep the traditional design path. Same goes for the engines. 6 Cylinder flat NA or Turbo. ( remember, all other experiments were not really successull, see 928) Such always pays !! For Lotus the same is true. They need to stick to their philosophy and their heritage Don't try to become somebody who you can't be and who your friends and fans don't want you to be. There is no need for mega displacements and a gazillion cylinders. Just make it a Lotus, that is all it takes Stefan
  5. -1 points
    Can we all have a hat each then so we can throw them at the Renault team sponsored by a rich childish git next year as thanks for being a bunch of [email protected]? Seeing the Chapmans jump ship so easily makes me laugh. Lotus back in F1, it's never been so much of a joke!
  6. -1 points
    This seems to me a very contrived statement, I can almost feel an arm twisted up my back. I'm liking the current management regime less and less. The problem for me is how much damage will be done to the mark before sense or receivership is reached. For the first time in 50 years I'm starting to feel negatively toward Lotus.


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