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Looking for specs on the Bosch 420 pump

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Old Feb 2, 2009 | 06:14 PM
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Default Looking for specs on the Bosch 420 pump
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?
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Old Feb 8, 2009 | 06:01 AM
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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.
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Old Feb 8, 2009 | 10:17 PM
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Here's what is in the Bosch catalog:



http://www.bosch-motorsport.com/cont.../html/2832.htm



http://www.lucasinjection.com/bosch_...fuel_pumps.htm
Last edited by 405HP_Z06; Feb 8, 2009 at 10:39 PM.
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Old Feb 10, 2009 | 02:27 PM
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anybody got another source for the filter sock that can mount to the bottom of this puppy for use in-tank?



like this but with a reasonable price tag?
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Old Feb 10, 2009 | 03:52 PM
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You can use this:

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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Old Feb 10, 2009 | 04:01 PM
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Originally Posted by MIGHTYMOUSE
anybody got another source for the filter sock that can mount to the bottom of this puppy for use in-tank?



like this but with a reasonable price tag?
Doing a little searching, the AN fitting on this filter is an 18mm x 1.5 to female 1/4" NPT fitting with the Fuel Safe filter sock (linked above) stuck on the end.
Last edited by 405HP_Z06; Feb 10, 2009 at 04:23 PM.
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Old Feb 10, 2009 | 04:26 PM
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hmm no kidding, well makes it seem less valuable but hey whatever gets the job done
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Old Feb 10, 2009 | 04:59 PM
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Look inside the pump. The last one I got had an internal gauze
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Old Feb 10, 2009 | 05:58 PM
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so i have a sumped tank. can i run a bosch 420 in that style? also what will one support? like horse on stockfuel pressure and 91 oct?

thanks
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Old Feb 10, 2009 | 06:18 PM
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Originally Posted by Big Bird WS6
so i have a sumped tank. can i run a bosch 420 in that style? also what will one support? like horse on stockfuel pressure and 91 oct?

thanks
From the flow test posted above, it looks like this pump flows 63.4 gph @ 4 bar. This is enough fuel to support the following:

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; Feb 10, 2009 at 10:00 PM.
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Old Feb 10, 2009 | 09:45 PM
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^ ^ ^ so a 255 intake for idle and crusie. with twin 420 sumped. will that support 1000 on e-85(like 1300 wheel on pump)
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Old Feb 10, 2009 | 10:09 PM
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Originally Posted by Big Bird WS6
^ ^ ^ so a 255 intake for idle and crusie. with twin 420 sumped. will that support 1000 on e-85(like 1300 wheel on pump)
What type of application? e.g. blower, turbo, etc.
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Old Feb 11, 2009 | 07:05 AM
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i'd say the -044 pump should be able to make 700rwhp each

if they can't then they are not worth it

also its not intake pump, its in-tank (pet peeve)
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Old Feb 11, 2009 | 12:06 PM
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^ ^ ^ sorry about in-tank. lol

so dave you are saying that the 420 pump should make 700 alone. so two of them should support 1400? did understand you right?
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Old Feb 11, 2009 | 01:08 PM
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yes you did

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Old Feb 11, 2009 | 01:48 PM
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nice graph
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Old Feb 11, 2009 | 09:38 PM
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Originally Posted by MIGHTYMOUSE
anybody got another source for the filter sock that can mount to the bottom of this puppy for use in-tank?



like this but with a reasonable price tag?
ATL has a 60 micron screw-on filter for this pump.
[http://www.atlltd.com/pdf/fuelfilter...20microns).pdf
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Old Feb 11, 2009 | 11:13 PM
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Originally Posted by Big Bird WS6
^ ^ ^ so a 255 intake for idle and crusie. with twin 420 sumped. will that support 1000 on e-85(like 1300 wheel on pump)
Here's a great flow comparison thread on another forum: http://forums.nasioc.com/forums/show....php?t=1238595

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Old Feb 12, 2009 | 07:28 AM
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what is this "044" you guys keep posting. i thought we were talking about the 420?
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Old Feb 12, 2009 | 09:25 AM
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-044 is the last three numerals in the Bosch part number for this pump. Bosch doesn't refer to this pump as the '420', it's a nickname adopted by the industry.
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