squealingtires

iTrader: (14)

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?

stevieturbo

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.

405HP_Z06

iTrader: (11)

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

MIGHTYMOUSE

iTrader: (59)

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?

405HP_Z06

iTrader: (11)

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.

405HP_Z06

iTrader: (11)

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.

MIGHTYMOUSE

iTrader: (59)

hmm no kidding, well makes it seem less valuable but hey whatever gets the job done

stevieturbo

Look inside the pump. The last one I got had an internal gauze

Big Bird WS6

iTrader: (9)

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

405HP_Z06

iTrader: (11)

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.

Big Bird WS6

iTrader: (9)

^ ^ ^ so a 255 intake for idle and crusie. with twin 420 sumped. will that support 1000 on e-85(like 1300 wheel on pump)

405HP_Z06

iTrader: (11)

What type of application? e.g. blower, turbo, etc.

MIGHTYMOUSE

iTrader: (59)

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)

Big Bird WS6

iTrader: (9)

^ ^ ^ 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?

MIGHTYMOUSE

iTrader: (59)

yes you did

tomz28

iTrader: (20)

nice graph

405HP_Z06

iTrader: (11)

ATL has a 60 micron screw-on filter for this pump.
[http://www.atlltd.com/pdf/fuelfilter...20microns).pdf

405HP_Z06

iTrader: (11)

Here's a great flow comparison thread on another forum: http://forums.nasioc.com/forums/show....php?t=1238595

Big Bird WS6

iTrader: (9)

what is this "044" you guys keep posting. i thought we were talking about the 420?

405HP_Z06

iTrader: (11)

-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.