Looking for specs on the Bosch 420 pump
#1
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Is the Bosch 420 pump the same physical size as the Walbro 255?
Anybody got a link for specs flow vs. pressure vs. supply voltage?
Anybody got a link for specs flow vs. pressure vs. supply voltage?
#2
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The Bosch pump is longer, and circa 2.5" diameter. It also has threaded fittings at each end.
Length of the top of my head is about 5", but I am guessing.
M12x1.5 at outlet, and M18x1.5 intake.
Specs are difficult. Bosch's own ratings are far more conservative than these pumps actually flow, but they do maintain their flow until about 7.5-8 bar ( 110psi or so ) before flow starts to drop off much.
The Walbros start to drop off dramaticalkly after about 75psi.
The 420 name you US guys use comes from 420 lb/hr
Bosch rate it at 180 litres per hour....most others around the world suggest closer to 330 litres per hour.
Either way, it is a very capable and reliable pump. Ive never tested a single, but I tested my dual 044 setup, and they flowed approx 486 litres per hour at 13.1v, 60psi test pressure pumping through through a single -6 line.
Length of the top of my head is about 5", but I am guessing.
M12x1.5 at outlet, and M18x1.5 intake.
Specs are difficult. Bosch's own ratings are far more conservative than these pumps actually flow, but they do maintain their flow until about 7.5-8 bar ( 110psi or so ) before flow starts to drop off much.
The Walbros start to drop off dramaticalkly after about 75psi.
The 420 name you US guys use comes from 420 lb/hr
Bosch rate it at 180 litres per hour....most others around the world suggest closer to 330 litres per hour.
Either way, it is a very capable and reliable pump. Ive never tested a single, but I tested my dual 044 setup, and they flowed approx 486 litres per hour at 13.1v, 60psi test pressure pumping through through a single -6 line.
#3
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Here's what is in the Bosch catalog:
![](http://www.andersonperformance.net/bosch044fp.jpg)
http://www.bosch-motorsport.com/cont.../html/2832.htm
![](http://www.lucasinjection.com/580%20254%20044%20flow%20chart.jpg)
http://www.lucasinjection.com/bosch_...fuel_pumps.htm
![](http://www.andersonperformance.net/bosch044fp.jpg)
http://www.bosch-motorsport.com/cont.../html/2832.htm
![](http://www.lucasinjection.com/580%20254%20044%20flow%20chart.jpg)
http://www.lucasinjection.com/bosch_...fuel_pumps.htm
Last edited by 405HP_Z06; 02-08-2009 at 10:39 PM.
#5
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You can use this:
http://www.pegasusautoracing.com/pro...asp?RecId=5812
![](http://www.pegasusautoracing.com/Images/L/FS-1HDW52.JPG)
and this
http://www.pegasusautoracing.com/pro...asp?RecID=5813
![](http://www.pegasusautoracing.com/Images/L/FS-FSHP.JPG)
Although it's about the same price.
http://www.pegasusautoracing.com/pro...asp?RecId=5812
and this
http://www.pegasusautoracing.com/pro...asp?RecID=5813
Although it's about the same price.
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#10
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BSFC HP
.45 - 650 FWHP (N/A application)
.5 - 585 FWHP (N/A application)
.6 - 487 FWHP (Blower application)
.65 - 450 FWHP (Turbo application)
These estimates include a 30% safety factor.
Last edited by 405HP_Z06; 02-10-2009 at 10:00 PM.
#17
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[http://www.atlltd.com/pdf/fuelfilter...20microns).pdf
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