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fuel pressure


sierra1off

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:dizzy: 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

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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

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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

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

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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

:D

Edited by sierra10ff

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

Standard fuel pressure is 55psi.

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

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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 ?

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

  • 2 weeks later...

Engine now running, first tun of the key, well happy :w00t:

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....

th_enginerunning008.jpg

second starting.....

th_enginerunning012.jpg

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

Good job ! Great to have it running now.

There is no spacer between the crank and flywheel. I don

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

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Hi mike.

the flywheel has been machined, but i thought it was only the cluth face

DSCF5035.jpg

there is only 20 thou gap between the flyweel and block, and thats with a 10 thou spacer i put in.

DSCF5034.jpg

I better keep inserting shims till the ring gear stops catching

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

Hi Alan,

Are you sure that

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

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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 ?

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

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 :sofa:

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

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

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