I don't know my injector flow rate, now what?

For discussing injector selection,manifold modifications, throttle bodies, fuel supply system design and construction, and FIdle valves and IACs.
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.

If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).

If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days

The full forum rules are here: Forum Rules, be sure to read them all regularly.
Post Reply
zorb847
MegaSquirt Newbie
Posts: 3
Joined: Thu Jun 17, 2004 5:35 am
Location: NJ - Butler

I don't know my injector flow rate, now what?

Post by zorb847 »

I want to use a throttle body from an 89 GM truck 350 motor but don't know what size injectors are in it. Where do I start? Anyone out there using this TBI or similar?
colinnwn
MegaSquirt Newbie
Posts: 6
Joined: Sat Apr 03, 2004 11:34 pm
Location: Dallas, TX USA
Contact:

Injector size

Post by colinnwn »

Hi zorb847,

Your injectors should be
injector engine flow lbs/hr throttle one GM
color code size at 13 psi bores part #
Green/White 5.0L 40 43mm 5235279

Thursday, June 24, 2004, 2:11:30 PM, you wrote:

z> I want to use a throttle body from an 89 GM truck 350 motor but
z> don't know what size injectors are in it. Where do I start? Anyone
z> out there using this TBI or similar?

Some info on GM TBIs and using them here
http://thegebharts.com/msindex.html

Later,
Colin
mailto:colin@thegebharts.com
-------------
Colin says...

Use a wickedly good email client | http://www.ritlabs.com/the_bat/index.html
For those of strong constitution | http://www.debian.org/

Keep away from people who belittle your ambitions. Small people always do that,
but the really great make you feel that you, too, can become great. -Mark Twain
jsanches
MegaSquirt Newbie
Posts: 1
Joined: Mon Feb 18, 2008 3:49 am

Re: I don't know my injector flow rate, now what?

Post by jsanches »

All,

Similar doubt here.
I've some injectors which I can't find any spec about them.

Could I measure them by myself? Someone could help?
If I apply 12V on the injectors during one minute and measure the amount of liquid (alcohol or gasoline) would it be realible?

Thank you,
Juliano
GM Diplomata 250 Cubic Inches running MS1 and burning Alcohol.
Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: I don't know my injector flow rate, now what?

Post by Matt Cramer »

Eric has some tips on how to flow test injectors at home, here:

http://www.not2fast.com/efi/injector_info.shtml
RC4U12
MegaSquirt Newbie
Posts: 4
Joined: Mon Nov 24, 2008 2:23 pm

Re: I don't know my injector flow rate, now what?

Post by RC4U12 »

Also check this site as they have flow ratings for more than any other site i have seen... http://www.fuelinjector.citymaker.com/p ... 212139.htm
'74 450SLC,,In assembly "MS-1, pertronix conversion, MSD 6al Ign box"
fury fan
Helpful Squirter
Posts: 96
Joined: Tue Dec 11, 2007 10:28 am
Location: Indianapolis

Re: Injector size

Post by fury fan »

colinnwn wrote:Hi zorb847,

Your injectors should be
injector engine flow lbs/hr throttle one GM
color code size at 13 psi bores part #
Green/White 5.0L 40 43mm 5235279

Thursday, June 24, 2004, 2:11:30 PM, you wrote:
Looks like the eyes jumped a line in the Gebhart data, for a 350 he should have the #5235206 55lb injectors.
Needs to get the toes out of the water and just jump off the diving board!!!
current EFI project:
65 Chrysler 300L, 413, working on inline dual GM TBI units, will run with MS2. Hoping to have factory-style appearance.
MustangSix
MegaSquirt Newbie
Posts: 7
Joined: Thu May 27, 2004 4:46 am

Re: I don't know my injector flow rate, now what?

Post by MustangSix »

Or you could do this:

viewtopic.php?f=29&t=37841
Hey_Allen
MegaSquirt Newbie
Posts: 23
Joined: Wed Dec 19, 2007 4:58 pm
Location: Tacoma, WA
Contact:

Re: I don't know my injector flow rate, now what?

Post by Hey_Allen »

Another option is to find a local injection cleaning shop and pick their brains while paying a fairly cheep rate for a flow check and inspection.

I just got done doing that with a set of injectors I got off of ebay, supposedly salvaged out of a Crown Vic.

Bugging a professional ended up getting me a few interesting insights into injector behavior under increased fuel pressure, as well as a few options on seals that I'd never seen in the after market, which will make my project easier.


Yes, I suspect I could have built a simple test bench for less than I paid him, but the side benefits made it worth it in my mind.

This is just my two cents, though.
Post Reply