MusCat Posted October 15, 2005 Share Posted October 15, 2005 The car is a 1989 Super Sprint XFlow - twin 40DCOEs, around 140bhp - electric fuel pump. The Facet Silver Top fuel pump has just packed up (Saturday night and away from home). Please can anyone give me the type/part number for the Facet Silver Top. Or the type/part number for an equivalent (reputably more reliable) Webcon fuel pump. Link to comment Share on other sites More sharing options...
nickdodo Posted October 16, 2005 Share Posted October 16, 2005 Muscat In Burtons cat the: Facit Silvertop is FAC476087 (18 Galls/hr. Cars up to 150 BHP) Facit Silvertop competition FAC480530 (27 Gall/hr. Cars up to 200 BHP) Best of luck... Nick in the (1987) 1700 X Flow... Link to comment Share on other sites More sharing options...
BrianHorn Posted October 17, 2005 Share Posted October 17, 2005 Slight hijack if I may? What is the advantage of an electric pump over the original mechanical one? Do the mechanical ones break or are the electric ones just more 'efficient'? Link to comment Share on other sites More sharing options...
mikes Posted October 17, 2005 Share Posted October 17, 2005 Brian, I think an electric has the advantage of being able to cope with higher flows/pressure necessary for higher bhp engines. I was told that the mechanical one would struggle to supply a 150bhp+ xflow. The other advantage is that you fill the float chambers before you start turning over the engine *smile*. Generally the mechanical one is pretty reliable with just a simple cam lobe striking a diaphragm as it rotates - worst that can happen is the diaphragm or seal going which will just spew a small amount of fuel into the sump. I have had a Facet solid state one for 3 years and it had been fine. Mike Link to comment Share on other sites More sharing options...
eric Posted October 17, 2005 Share Posted October 17, 2005 mechanical pump could be fine without the hassle of the electric one 140 HP is perfectly ok for it I will not change the mechanical pump for an electric on my sprint Caterham eric Link to comment Share on other sites More sharing options...
BrianHorn Posted October 18, 2005 Share Posted October 18, 2005 Sounds like a case of 'if it ain't broke, don't fix it' My car is a standard SuperSprint 1.7 xflow so is only producing about 120-130bhp. Therefore mechanical pump should be absolutely fine? Link to comment Share on other sites More sharing options...
oilyhands Posted October 18, 2005 Share Posted October 18, 2005 The only drag with a mechanical pump is if the engine has been left for a while and the float chambers are empty thru evaporation, it then takes a while to fill the float chambers so starting is delayed. With an electric pump the chambers are filled pretty much instantly, but do make sure you use a fuel pressure regulator since the float valves are overwhelmed at pressures greater than 4PSI or so. Oily Link to comment Share on other sites More sharing options...
robert green Posted October 18, 2005 Share Posted October 18, 2005 Definately agree the electric pump allows the car to fire first time rather than churning the engine over just to get fuel to the carbs. Must be easier on the battery and the starter motor, neither of which are particularly known for their longevity on a xflow. If you car is not used daily I'd say it was a worth while upgrade. Link to comment Share on other sites More sharing options...
BrianHorn Posted October 18, 2005 Share Posted October 18, 2005 Isn't it healthier though for an xflow motor NOT to start instantly so that it gets some lube around the place before it starts running? Link to comment Share on other sites More sharing options...
Nigel Riches Posted October 19, 2005 Share Posted October 19, 2005 Sorry Brian, NO, get the motor burning and turning as soon as possible, when you crank on the starter with the plugs in place there is next to no oil flow, the oil pump isn't designed to run at less than about 900 rpm (crankshaft) and produce any sensible oil pressure, let alone flow, so crank, fire, run, under no load at about 1500 rpm, and watch the oil pressure rise. Long periods of "starter cranking" are bad for the bearings. 1982. 5 speed, clamshells. B.R.G / Ali. The True Colours. Link to comment Share on other sites More sharing options...
BrianHorn Posted October 19, 2005 Share Posted October 19, 2005 Morning Nigel, well didn't I get that wrong 😳 Link to comment Share on other sites More sharing options...
Nigel Riches Posted October 19, 2005 Share Posted October 19, 2005 Morning Brian, I'm just off to bed now as it's 22:00 hrs in the far flung corners of the empire. I hope you have a very pleasant day, regards Nigel. 1982. 5 speed, clamshells. B.R.G / Ali. The True Colours. Link to comment Share on other sites More sharing options...
BrianHorn Posted October 19, 2005 Share Posted October 19, 2005 Oh! Goodnight then! 😬 Link to comment Share on other sites More sharing options...
MusCat Posted October 22, 2005 Author Share Posted October 22, 2005 Thanks guys. The pump that failed was a Facet Silvertop Competition. So it has been replaced today, like for like. But on starting up the engine (1700cc Xflow, twin 40DCOEs, 140 bhp) the tick-over had increased from 1200rpm to 4.0-4.5k. Have brought it down to 1200rpm again. And the car runs fine, perhaps a little better at low revs, but no significant difference at speed. But why should the tickover have increased? There were no obvious signs of fuel starvation with the old pump before it gave up. Two plugs sooted up a while back when stuck in a jam for 45 minutes at Shelsley Walsh, but the other two were a nice dark grey. It did 100mph+ at the recent Brands Hatch track day. The car pops and bang a bit, but it always has done. From the exhaust I think. I have not checked the car out to see whether a fuel pressure regulator has been fitted. What happens if the pressure is too high at the carbs? Link to comment Share on other sites More sharing options...
Graham Perry Posted October 23, 2005 Share Posted October 23, 2005 There is a bit on this here Link to comment Share on other sites More sharing options...
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