datrod Posted May 28, 2012 Report Share Posted May 28, 2012 Just something I made over the weekend. New fuel rail for my Z car. 1 Quote Link to comment
metalmonkey47 Posted May 28, 2012 Report Share Posted May 28, 2012 Very nice. It looks super clean. 2 Quote Link to comment
MicroMachinery Posted May 28, 2012 Report Share Posted May 28, 2012 Wow, that's awesome. How much would a 4-cyl version run? :cool: 1 Quote Link to comment
jalexquijano Posted October 21, 2016 Report Share Posted October 21, 2016 where did you get these type of hoses? does it stop the fuel percolation? I want to remove the stock fuel rail and install a system as yours. 1 Quote Link to comment
datzenmike Posted October 21, 2016 Report Share Posted October 21, 2016 This thread is 4 years old..... 1 Quote Link to comment
russaroll Posted October 21, 2016 Report Share Posted October 21, 2016 Happy birthday 2 Quote Link to comment
racerx Posted October 21, 2016 Report Share Posted October 21, 2016 very nice! 1 Quote Link to comment
datzenmike Posted October 22, 2016 Report Share Posted October 22, 2016 This has a return line to the tank which is good. Cool gas is constantly being pumped past the carbs. However that 'fuel rail' would work better if it was over closer to the carbs. This would shorten the lines to the SUs that would have stagnant gas in them absorbing heat. All return lines need a restriction in them. Without this restriction the gas would just return to the tank rather than push into the carbs. The restriction would allow pressure to build on the carb side. About a 1mm hole would do. 1 Quote Link to comment
jalexquijano Posted October 23, 2016 Report Share Posted October 23, 2016 well down here in Panama we are still trying to figure out this percolation issue. stuck in traffic, car starts to stumble lowering rpms from 900 to 700 back and forth and when engine heat rises falls to 200 rpm. park the car, open the Hood, pull the plugs and all came out black sooty. Its weird that even after installing heat shield extensions covering the fuel bowls of both SU Carbs i am still having this issue. Its really uncomfortable to drive this way on traffic. 1 Quote Link to comment
datzenmike Posted October 23, 2016 Report Share Posted October 23, 2016 Black sooty is over rich. Maybe flooding? Not sure if the SU can flood like a regular carb. There is an over flow fitting on the float chamber usually fitted with a hose traveling down beside the engine so if there is flooding, the excess gas is dumped on the road. #5 is the over flow tube. Looks for yours and make sure it's open. Gas boiling in the float chamber may pressurize it if the overflow is closed off and force gas through the jet. Route a hose down beside the engine beside the oil pan and away from the hot exhaust. 1 Quote Link to comment
Charlie69 Posted October 24, 2016 Report Share Posted October 24, 2016 Install a fuel return line with the return line being a metered orifice to help keep fuel in the carbs. 1985 720 Z24 return line. There is a metered orifice in the return line that helps get fuel to the carb/carbs. Quote Link to comment
jalexquijano Posted October 26, 2016 Report Share Posted October 26, 2016 The Airtex 8012s electric fuel pump is pushing 4.3 to 4.5 psi to the SU CARBS! Should i also get a Malpassi King Fuel Filter regulator so i can lower the psi to 3.5??? Could this also be the cause of percolation? or should i leave the pressure as it is!! Quote Link to comment
datzenmike Posted October 27, 2016 Report Share Posted October 27, 2016 Fuel boiling isn't caused by pump pressure. One of your problems is over rich causing those sooty plugs so yeah I would definitely drop the pressure to the level recommended for use on SU carbs. Quote Link to comment
jalexquijano Posted January 9, 2017 Report Share Posted January 9, 2017 OK! ill need to get a good fuel pressure regulator to lower to 4 psi! Malpassi fuel pressure regulator!!!! Quote Link to comment
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