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T.C. Mann
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.
  #2   Report Post  
Robert Swinney
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

This begs the question . . . . . Why ?
"T.C. Mann" wrote in message
m...
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.



  #3   Report Post  
Jim Stewart
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton5 HP Engine

T.C. Mann wrote:
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.


The closest I've heard is adapting a Honda
4 cyl ECU and injectors to work in a 2 cyl
motorcycle engine. It worked, but I don't
have any links for you.


  #4   Report Post  
Todd Rearick
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

You know...I've wondered the same thing. I have an old Toro lawn mower that
I use for odd jobs around the house. I think it was made in '75 or there
abouts. Anway, It's a bit finicky to get started...easy to flood and really
touchy to adjust the choke right. I'm sure most would call me crazy, but I
think it would be a fun project to build a FI system for it.

Sorry...I don't really have any info or links...just moral support.


"T.C. Mann" wrote in message
m...
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.



  #5   Report Post  
Robert Swinney
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

Yeah, but the "fun" might go out of it when you tried to make a fuel pump
and adapt it to the engine.

Bob Swinney
"Todd Rearick" wrote in message
news:[email protected]...
You know...I've wondered the same thing. I have an old Toro lawn mower

that
I use for odd jobs around the house. I think it was made in '75 or there
abouts. Anway, It's a bit finicky to get started...easy to flood and

really
touchy to adjust the choke right. I'm sure most would call me crazy, but

I
think it would be a fun project to build a FI system for it.

Sorry...I don't really have any info or links...just moral support.


"T.C. Mann" wrote in message
m...
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.







  #8   Report Post  
Jon Elson
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton5 HP Engine



T.C. Mann wrote:

Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.


We had a team build a hybrid electric car a few years back, for an SAE
national university challenge. The engine and car were donated, so you had
to use those parts. The engine, as I remember, was a Briggs&Stratton
2-cyl engine. The young woman who got herself elected project leader
found an outfit that had been preparing to market small engine EFI systems
when it looked like the EPA was going to require emissions controls on
small engines. They had a kit with the computer and a few other components
that she bought. She hooked up two of the injectors off the Ford Taurus,
used the existing fuel pump in the tank, and one of the O2 sensors off the
original engine, calibrated the thing, and it worked. I was rather amazed
at the expertise of a 21-yr old mechanical engineer to pull this off!
(The graduate-level electrical engineer working on the electronics for
the main DC motor drive was ALL wet, ignored all my advice, and
ended up with a car powered by a 90 Hp electric motor plowing sideways
through a room full of people when the main power transistor shorted.
There were people climbing benches and whatever to get out of the way!
Luckily, no injuries on that one.)

Anyway, I do't recall the name of the outfit that made this kit, but it was
apparently a configure-it-yourself setup, with a PC program that would
allow you to do all the calibration, etc.)

Jon

  #9   Report Post  
Karl Townsend
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

Just a lead for you.

The fellas that race go carts have this. There's a cart class for "looks
like a briggs- but do what ever you can to it." I've seen super charged
fuel injected units.

karl



  #10   Report Post  
Jerry Martes
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine


"T.C. Mann" wrote in message
m...
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.


T.C.

Have you tried contacting one of the news groups where they deal with
building fuel injections. I've read about guys designing *and* building
their own injection systems. Alt. autos fuel-injection is a start

Jerry




  #11   Report Post  
Wayne
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

I had a 1976 SAAB that had a mechanical fuel injection system. I was very
simple and that motor had LOTS of balls. In 1976 most cars were nothing but
smog pumps, but that old Saab didn't need any of the emissions stuff and ran
very good.


  #12   Report Post  
Mike
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

Think the "Karters" are already doing this. Especially the alcohol burners.
Quite easy. They divert the pressure diaphram lift pump that fills the
resevoir in the tank "float level" to the main mixture screw. From there
straight into the carburetor using the existing port. They use the mixture
screw to set the maximum mixture setting and let the rest go. Vacuum does
not pull the fuel in. The system is pressurized. Works quite well for a
racing setup.



  #15   Report Post  
Ted Edwards
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

Ecnerwal wrote:

Let's see - you need an O2 sensor, you need a fuel pump, you need an
injector, and you need a little computer to control it all. You may also
need an array of other sensors, such as various temperature readings. So
you'll be adding a generator if the mower does not have one. If it were
me I'd add a better muffler along with the O2 sensor, since I just don't
think the standard lawnmower exhaust is even remotely quiet enough.


Gross overkill for the application. SInce you wish to operate at
essentially constant rpm and nearly constant power at fairly well known
temperature and pressure, the requirements are much less. Cars need to
run over a wide range of environmetal conditions and over a wide range
of speed and torque.

In the late 60's, I had a Cessna 205 which had an injected engine.
There was a fuel pump and a bypass valve to control the pressure at the
injectors and a throttle butterfly to control the air. IIRC, the
throttle affected both the bypass and the butterfly and the mixture
control affected the fuel pump or possibly was tied into the bypass.
The injectors were partially pinched of pieces of copper tube that
sprayed the fuel into the manifold just before the intake valves.
Performance was good as was fuel consumption so the simple system
obviously worked.

Ted



  #16   Report Post  
Old Nick
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

On Fri, 23 Jul 2004 16:57:02 -0500, Jon Elson
vaguely proposed a theory
.......and in reply I say!:

remove ns from my header address to reply via email


I was rather amazed
at the expertise of a 21-yr old mechanical engineer to pull this off!
(The graduate-level electrical engineer working on the electronics for
the main DC motor drive was ALL wet, ignored all my advice, and
ended up with a car powered by a 90 Hp electric motor plowing sideways
through a room full of people when the main power transistor shorted.
There were people climbing benches and whatever to get out of the way!
Luckily, no injuries on that one.)


And now she's a mom with three kids, and he designs Mars landers,
right? G
************************************************** ***
It's not the milk and honey we hate. It's having it
rammed down our throats.
  #17   Report Post  
Winston
 
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Default OT was: Building a Homemade Fuel-Injection System on a Briggsand Stratton 5 HP Engine

Old Nick wrote:
On Fri, 23 Jul 2004 16:57:02 -0500, Jon Elson
vaguely proposed a theory
......and in reply I say!:

remove ns from my header address to reply via email


I was rather amazed
at the expertise of a 21-yr old mechanical engineer to pull this off!


(Snip)

And now she's a mom with three kids, and he designs Mars landers,
right? G
************************************************** ***
It's not the milk and honey we hate. It's having it
rammed down our throats.


Having a bad day, Nick?


Allergic to good news, are we?

--Winston - 'Mr. Milk and Honey'

  #18   Report Post  
Jeridiah
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

"Todd Rearick" wrote in message news:[email protected]...
You know...I've wondered the same thing. I have an old Toro lawn mower that
I use for odd jobs around the house. I think it was made in '75 or there
abouts. Anway, It's a bit finicky to get started...easy to flood and really
touchy to adjust the choke right. I'm sure most would call me crazy, but I
think it would be a fun project to build a FI system for it.

Sorry...I don't really have any info or links...just moral support.


"T.C. Mann" wrote in message
m...
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.


I have contemplated this for a long time, but have never gotten around
to actually DOING it. I have always wanted to build my own fuel
injection system. I was thinking of injecting my VW dune buggy.
Maybe get real crazy and turbo it someday(but I doubt it).
I was on the SAE formula team in college. We modified a Haltech(I
think?) injection system to run a bike motor. It worked fairly well.
The engine controls has always been a cool idea to me. I want to do
it, just to do it. If I had a serious application I would buy one of
the generic off-the-shelf packages available out there, like what have
been suggested. A co-worker has the megasquirt system on his Audi
turbo. Currently, just using it for spark control I believe, and
waiting to tie in the fuel.

JW
  #19   Report Post  
JimH720113
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

You know...I've wondered the same thing. I have an old Toro lawn mower
that


biggest prob. will be to manage that little amount of fuel. i have built a
couple for harleys and the idle circuit is the one that requires the attention
to flow. but it is pretty easy one you get the basic principle down pat. volume
and pressure are the only things you need to control.
"try it-you'll like it"
jim
  #20   Report Post  
Mark Storkamp
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine


"T.C. Mann" wrote in message
m...
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.


IIRC the January 2002 issue of Circuit Cellar magazine had an article about
home-brew fuel injection.




  #21   Report Post  
c
 
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Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine


"Jerry Martes" wrote in message
...

"T.C. Mann" wrote in message
m...
Hello,

I would like to know if anyone has ever tried to implement a FI system
for use on a small lawn mower engine. What would be involved in doing
this and would it work? Are there any DIY sites that discuss this or
are plans available? Any other good references? Thanks a bunch.


T.C.

Have you tried contacting one of the news groups where they deal with
building fuel injections. I've read about guys designing *and* building
their own injection systems. Alt. autos fuel-injection is a start

Jerry


This is about the best site I have found for DIY fuel injection systems.
http://www.megasquirt.info/

Chris


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Posted to rec.crafts.metalworking
external usenet poster
 
Posts: 1
Default Building a Homemade Fuel-Injection System on a Briggs and Stratton 5 HP Engine

replying to Ecnerwal, Jiix wrote:
There are companies around that specialise in small engine efi systems, but on
a lawnmower.... you would need it to be either electric start or have a
charging system for 12 volts to run the unit ...www.ecotrons.com do 2
versions 50-300 cc and 400 to 800 cc if you wanted to have a kit..they are not
exactly cheap, but speeduino.com do the same thing but cheaper.
To run the ecu you would need to convert the rotary spark generator to become
the crank position sensor, install a separate ignition system to make the
spark instead, fit a fuel pump and replace the carb for a throttle body
(replaces the carb and has the fuel injector installed in it)...you would have
to do the tuning yourself to get the spark in the right time and then build a
fuel map to deliver the right amount of fuel at the right revs and engine
load.. I to am looking into this and thinking a single cylinder motorbike efi
might be easier to convert and cheaper too

--
for full context, visit https://www.polytechforum.com/metalw...st-358780-.htm


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