polishing intake runners worthwhile? & bosch high psi/high

[Ross Corrigan]

Thanks for the offer Tom, with our canuck buck as it is your's would still 
cost me ~$200+/- to get here so I'll most likely get new for ~$250 total 
and bosch quality.

good info on their injectors, you using GM or SVO ones now?

I've also queried to no definite answer other sources on the following. I 
figure polishing or just 'smoothing' (ie. not getting a full blown polish 
finish) on the inside of my Victor Jr. runners/EFI intake may 'slightly' 
enhance airflow by reducing turbulence along the rough 'as is' surface AND 
reduce the heat the intake radiates to my incoming air keeping it denser 
and thus more efficient/more power (slight I'd guess but worth a few hours 
of sanding/burnishing by hand or with an appropriate bit in my die 
grinder?).  comments/ideers?  My prior carb setups got pulled/replace 
fairly often and this new EFI setup I plan on leaving on for a while so 
looking to do a few more tweaks before it's all bolted on. I also plan to 
make/buy a simple sheet metal shield for the bottom of the intake to 
prevent hot oil from splashing directly on it in an effort to keep physical 
intake temp down.

all comments/ideas welcome



At 11:57 AM 5/10/01 , twsharpe at mtco.com wrote:
>The stock Edelbrock pump is good for 450 HP but not for 500 HP and is
>reasonably quiet. You can have mine for $100.  Edelbrock uses 24 lb 
>injectors @
>3.5 bar and calls 'em 30 pounders. I tried 36s to get more fuel to a 500 hper
>and could not lower the regulator or fuel settings enough to get it right. I
>went to 30s (pretend 36s) at 3.5 bar and things are better but the pump leans
>out over 5500. I got the big NOS pump - it's a Bosch but I don't have the
>numbers in front of me.
>
>Picture at http://www.mtco.com/~twsharpe/efistuf.htm
>
>Tom
>
>Quoting Ross Corrigan <280zx at home.com>:
>
> > rare day when I can contribute:)
> >
> > I figured this info may be of use for others looking to purchase a fuel
> > pump.  I have the tables (some 7-9 pages) of fuel pump info from a
> > member
> > here previously but coudn't cross over those PN's with anyone and the OE
> >
> > application wasn't always specific so I chased down some Bosch PN/info.
> > BOSCH TECH US/CANADA 1-800-521-5462
> >
> > I called Bosch and got the psi/gph and PN info below and then pricing is
> >
> > CD$'s (/1.55 ~ for US) from a local auto chain
> >
> > 43.5 psi at 58 gph  0580 254 909 $210 my cost but not in stock
> > 72.5 psi 47.5 gph  0580 464 070  $269 my cost, $369 retail
> > 72.5 psi 42 gph     0580 254 910  $227 in stock and $303 retail
> > 72.5 psi 33 gph     0580 254 911      didn't ask for $ info
> > 58 psi at 36.5 gph 0580 464 069      didn't ask for $ info
> > -all 12mm threads
> >
> > My setup won't exceed 450 flywheel hp so I figure using ~.55lbs/hp/hr
> > =247.5lb fuel/hr. And I forgot to ask Bosch if their gallons were US or
> > Imperial.....either 6 lb/gal or 7.2 which yields a possible bracket of
> > 41
> > or 34 gph.  As all of this is somewhat conservative using .55 (correct?
> > depending on AFR etc) the 72.5 psi/42gph  $227CD pump should be fine
> > right??  My edelbrock proflo 3500 specs 45-50psi.  I'm optimistic this
> > pump
> > will be quiet as well.  One friend reccomended wrapping it in tape to
> > keep
> > it quiet and prevent rusting.  Any comments/ideers on this?
> >
> >
> >
> > Ross Corrigan  /  Vancouver, Canada
> >
> > Ahh, finished with that inferno of work and returning back to the
> > lifelong
> > ahem, physics experiments :) ) )
> >
> > mailto:280zx at home.com      ICQ # 11549358
> > http://207.212.212.139/~corrigan/gearheads/pics/wheels/sirbg.jpg
> > where a
> > Z belongs
> > 
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> >
> >
> >

Ross Corrigan  /  Vancouver, Canada

Ahh, finished with that inferno of work and returning back to the lifelong 
ahem, physics experiments :) ) )

mailto:280zx at home.com      ICQ # 11549358
http://207.212.212.139/~corrigan/gearheads/pics/wheels/sirbg.jpg    where a 
Z belongs
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