sierra1off Posted November 23, 2008 Report Share Posted November 23, 2008 Technical question, I have fitted up fuel lines to my engine which is still on a stand, and with the pump running there is 65psi, and when i turn the pump off it holds 55psi. (engine not running yet) Shouldnt it show 55psi max at all times, or does this indicate the return pipe is too small,thus making more pressure ( its -6 like the supply pipe ? ) Thanks alan Quote Anglia cosworth powered Sierra 5.7L mustang powered Sierra convertable Nissan Skyline suzuki bandit with 1100gsxr engine Jag XJ8 Mk2 Cortina, no engine Lotus V8 engine, no car Link to comment Share on other sites More sharing options...
mike_sekinger Posted November 23, 2008 Report Share Posted November 23, 2008 Hi Alan, The pressure regulator should be doing its job and doing its best to keep the pressure constant. High pressure could well imply that the return line is too small..... Residual pressure after switch-off is good and shows signs of no leaks. Off the top of my head, I do not know what the diameter of the standard fuel return is - sorry. Cheers, Mike S Quote 1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear) 1999 S350 #002 Esprit GT1 replica Link to comment Share on other sites More sharing options...
sierra1off Posted November 24, 2008 Author Report Share Posted November 24, 2008 (edited) What should the standard fuel pressure be anyone?? I thought it could be the one way valve on the fuel pump letting the pressure drop from 65 to 55 when the pump is turned off, but wouldnt a one way valve seal better with 65 psi pushing it shut rather than 55psi ??? the short length of return pipe on it at the moment is a factory piece of pipe 6mm id so its not restricted Edited November 24, 2008 by sierra10ff Quote Anglia cosworth powered Sierra 5.7L mustang powered Sierra convertable Nissan Skyline suzuki bandit with 1100gsxr engine Jag XJ8 Mk2 Cortina, no engine Lotus V8 engine, no car Link to comment Share on other sites More sharing options...
mike_sekinger Posted November 25, 2008 Report Share Posted November 25, 2008 Standard fuel pressure is 55psi. Quote 1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear) 1999 S350 #002 Esprit GT1 replica Link to comment Share on other sites More sharing options...
sierra1off Posted November 25, 2008 Author Report Share Posted November 25, 2008 Thought so. Will have to try a larger bore return pipe first Other option is a less powerfull pump Currently using a bosch 044 pump confused as to why the pressure rises to 65psi when the pipes are all factory parts ? Quote Anglia cosworth powered Sierra 5.7L mustang powered Sierra convertable Nissan Skyline suzuki bandit with 1100gsxr engine Jag XJ8 Mk2 Cortina, no engine Lotus V8 engine, no car Link to comment Share on other sites More sharing options...
sierra1off Posted December 5, 2008 Author Report Share Posted December 5, 2008 Engine now running, first tun of the key, well happy Is there a shim / spacer between the flywheel and crank, cos the ring gear is just dragging on the starter motor gear and its only a few thou from the back of the block? its only two pipes into 1...50mm diameter and its soooooo quiet !!! First turn of key.... second starting..... Quote Anglia cosworth powered Sierra 5.7L mustang powered Sierra convertable Nissan Skyline suzuki bandit with 1100gsxr engine Jag XJ8 Mk2 Cortina, no engine Lotus V8 engine, no car Link to comment Share on other sites More sharing options...
mike_sekinger Posted December 5, 2008 Report Share Posted December 5, 2008 Good job ! Great to have it running now. There is no spacer between the crank and flywheel. I don Quote 1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear) 1999 S350 #002 Esprit GT1 replica Link to comment Share on other sites More sharing options...
sierra1off Posted December 7, 2008 Author Report Share Posted December 7, 2008 Hi mike. the flywheel has been machined, but i thought it was only the cluth face there is only 20 thou gap between the flyweel and block, and thats with a 10 thou spacer i put in. I better keep inserting shims till the ring gear stops catching Quote Anglia cosworth powered Sierra 5.7L mustang powered Sierra convertable Nissan Skyline suzuki bandit with 1100gsxr engine Jag XJ8 Mk2 Cortina, no engine Lotus V8 engine, no car Link to comment Share on other sites More sharing options...
mike_sekinger Posted December 7, 2008 Report Share Posted December 7, 2008 Hi Alan, Are you sure that Quote 1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear) 1999 S350 #002 Esprit GT1 replica Link to comment Share on other sites More sharing options...
sierra1off Posted December 10, 2008 Author Report Share Posted December 10, 2008 I assumed it was the original flywheel bachined flat, but it does not matter too much as i will be bolting a torque converter to it anyway. I fitted a second 10 thou shim and its ok now. Its very quiet when running, i will get away with no exhaust boxes at all, 2 1/2 inch strait through i recon. i have seen lots of posts about changing exhaust systems to achieve a sportier sound, maybee mine would sound different with two seperate pipes, will have to try that and see. Has anyone run with open exhausts, and no cat, how loud was it ? Quote Anglia cosworth powered Sierra 5.7L mustang powered Sierra convertable Nissan Skyline suzuki bandit with 1100gsxr engine Jag XJ8 Mk2 Cortina, no engine Lotus V8 engine, no car Link to comment Share on other sites More sharing options...
Tony94S4 Posted December 11, 2008 Report Share Posted December 11, 2008 the s4 was very loud with 3" open down pipe, will try it 2 on the v8, do u have a project car in mind for the engine? torque converter on what box? automatic? Quote Link to comment Share on other sites More sharing options...
sierra1off Posted December 11, 2008 Author Report Share Posted December 11, 2008 Hi Tony, The engine is going into a Mk 2 Cortina, and it will be an automatic box, a mix of Jag and Range Rover my thinking is that you dont come off boost every time you change gear, which keeps the power on, with no snap on / off loads on the drivetrain. alan Quote Anglia cosworth powered Sierra 5.7L mustang powered Sierra convertable Nissan Skyline suzuki bandit with 1100gsxr engine Jag XJ8 Mk2 Cortina, no engine Lotus V8 engine, no car Link to comment Share on other sites More sharing options...
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