Mechanical Fuel Pump

[tacker]

has anyone seen or used a mechanical fuel pump such as this one.

How 2,500 horses get fed.

Capable of supporting 350 to 2,500 hp, these fuel pumps are made just for serious racers. They flow 2,700 lbs./hr. of fuel, deliver 2 to 200 psi worth of fuel pressure, and work with any type of fuel. That's enough fuel flow and pressure to support a 6-second drag car--fuel injected, blown, turbocharged, or otherwise! Their belt-driven design means there's no current draw, and the pumps require no priming. They have a billet aluminum housing and bracket, a -10 AN O-ring port, and an anodized finish.

[brother_david]

Sounds very intresting, havent used one though..

[666DAN]

You can't beat mechanical

[Alf]

I'd be scared to ask how much

[grigor]

The Gibson GTR's used a mechanical pump to boost rail pressure, but that was in the days before large injectors were so readily available.

[tacker]

not all that badly priced either, parts in the pic above are around 600$

which is about the price of a twin 044 set up with a swirl pot

Edited February 6, 2007 by tacker

[Fitzpatrick Speed Works]

You will need a fuel tank in the engine bay no more than 500mm from the pump, it will need to be at least 10 litres you will still need an electric pump this can be a low psi unit used primarily to fill the engine bay tank. I wouldnt suggest running it off the camshaft like GIbson, you will probably snap it, it will need to run off the crank, and you will need to work out the pulley sizes and make a custom one for your balancer. the pulley size is crucial to make sure you have enough pressure on idle... another factor will be the car will be difficult to start as when you are winding it over you arent generating much pressure so you may need a little pressure resevior with a stop valve that will work on start up.

Your $600 pump will easily run you $2000 buy the time everything is set up properly.. Not exagerating.

Edited February 6, 2007 by Fitzpatrick Speed Works

[Fitzpatrick Speed Works]

oh and no primign means they can be ran dry between runs, ie you dont need to make sure there is fuel in the pump to lubricate it.

[PurpleR32]

You will need a fuel tank in the engine bay no more than 500mm from the pump, it will need to be at least 10 litres you will still need an electric pump this can be a low psi unit used primarily to fill the engine bay tank. I wouldnt suggest running it off the camshaft like GIbson, you will probably snap it, it will need to run off the crank, and you will need to work out the pulley sizes and make a custom one for your balancer. the pulley size is crucial to make sure you have enough pressure on idle... another factor will be the car will be difficult to start as when you are winding it over you arent generating much pressure so you may need a little pressure resevior with a stop valve that work on start up.

Your $600 pump will easily run you $2000 buy the time everything is set up froperly.. Not exagerating.

if it is run off the crank, would there be a sizable/noticeable power loss due to the extra load?

[Fitzpatrick Speed Works]

No i wouldnt say so, maybe 5-10rwkw max at full noise, much the same as a AC compressor, your car may feel a little sluggish compared to what your used to though again the same as when the AC is on.

[tacker]

Why would it snap a cam shaft ? Its a ribbed belt so it doesnt need to be super tight. Surely compressing a valve spring would have more resistance than this pump. And if it was good enough for the Gibson GTR it will do me.

http://www.skylinesaustralia.com/forums/in...howtopic=121344

I would not think a mechanical pump would take anymore energy to drive at the same flow / pressure than a electric pump, both are gear pumps. But i guess there would be a little more parasitic losses caused fiction on the belt drive. But then again you still have a belt drive to your alternator which supplies your electric fuel pump and voltage drop as well to the fuel pump in the rear of the car.

Edited February 6, 2007 by tacker

[Fitzpatrick Speed Works]

Yeah Gibson had billet cams, and if it snapped on a gibson GTR what did they have that you dont, SPARE motors and an basically unlimited budget.

If you own a street car you are being ridiculous if you run a mech pump, mechanical pumps are nothing new to me have used them for a very long time on blown alcohol V8's they are good things but they aren't street friendly, or cheap to set up, that $600 pump will blow out.

Another note theres a thread running at the moment on snapped camshafts, these thing are as fragile as glass I have snapped one myself just tightning the bearing, a pump no matter the belt type is resistance. I simply would never feel safe running it off the camshafts. Reece Mcgregor runs his of the crank, you could almost argue if its good enough for Reece its good enough for me. But then again both the Gibson car and Reece's are out and out race cars at the very highest level.

Oh and another thing the Gibson ran the pump as a secondary measure look in the boot there is still an intense electric fuel syste, in place...as you said if its good enough for Gibson.....!!!

Edited February 6, 2007 by Fitzpatrick Speed Works

[r33_racer]

Yeh i always wondered about that major fuel system in the boot. Why would they have needed the mechanical pump if they had such a trick setup in the boot with back up pumps and all.

[FATGTS-R]

I asked the same question to the owner of the ex-gibson GTSR which runs the same system.

He basically told me that all the fancy pumps in the boot feed the mech pump and that the elec pumps couldnt hold a candle to the capability of the mech pump.

The reason, as someone already mentioned was that they used injectors that were too small (he told me they were standard?) to flow the fuel requirements being fed from only electric pumps so the mech one was there to force the fuel through the injectors no doubt with a tad bit of fuel pressure.

[tacker]

What do you mean the mechanical pump was a second measure? as other have said it was needed to increase the pressure to run through stock injector.

Also are HKS cams billet items as i am only knew to skylines and i dont want my glass camshafts to break

[Fitzpatrick Speed Works]

I too have talked to the guy with the r31 race cars with mech pumps, and as stated the mech pump was to increase the pressure from the electric ones,the mech pump was not used as a sole operating pump. Thus it was a second measure, thats what I mean.

You also stated price as a factor, as I have stated you will not do a mech fuel system cheaper than 2x044 and a surge tank.

At the end of the day do what you like, you asked if anyone has seen or used a pump like this so I answered your thread, cause i have both seen the pump you are referring to as I actually own one that is being mounted to a FJ20, and I have used similar pumps and had lengthy discussions with the heat treatments team about drag racing fuel systems set-ups. That being said, if you have no use for the info I am offering and from what I can tell just being a smart arse back who it seems has made up their mind stop asking questions that you don't like the answers to.

Edited February 6, 2007 by Fitzpatrick Speed Works