8 Stack Mechanical Fuel Injection 101 (Part3) Idle Bypass - Nozzles - Fuel Pump
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- čas přidán 18. 02. 2023
- Following up with the Idle Poppet Can purpose and discussing Injector Nozzles and Fuel Pump. I appreciate all comments.
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Part 1 • 8 Stack Mechanical Fue...
Part 2 • 8 Stack Mechanical Fue... - Auta a dopravní prostředky
You are doing a great job of presenting this information. Thank you for the effort.
Appreciate all your information I need to learn all I can. Thank you again.
Thanks for sharing this information. You explain everything in great detail and it definately helped with my understanding of how the system works. Thank You!
Thanks. CHEERS from AUSTRALIA.
Great video.
The provision for the injectors above the throttle plates are there for vehicles that are running dual injectors and dual barrel valves, high volume. The second valve will open at WOT or about 3/4 throttle. Some vehicles will run larger injectors, however it's hard to get them to idle with large injectors so they go to a dual setup.
The four whole injectors you were talking about are for higher volume or bigger cubic inch motors, normally different types of fuel. You are absolutely right by saying it creates a vacuum leak, their purposely trying to do it. Adjusting the throttle blades would also work but they would need to be about a quarter ways open.
If you were to move your injectors to the top of the throttle blades and not below for a single setup such as yours it would not run properly. Due to the fact they would push fuel on top of your closed throttle blades.
Thank you for taking the time to make these videos. I wish they had them when I started out. Just happened to stumble across them when trying to explain this to a friend of mine.
Then you run across a unit like this one which only has provisions for above... www.ebay.com/itm/185870370592?_trkparms=amclksrc%3DITM%26aid%3D777008%26algo%3DPERSONAL.TOPIC%26ao%3D1%26asc%3D20220705100511%26meid%3D5438fb5b5b37477cb4c51df0a53b2ef8%26pid%3D101524%26rk%3D1%26rkt%3D1%26itm%3D185870370592%26pmt%3D0%26noa%3D1%26pg%3D2380057%26algv%3DRecentlyViewedItemsV2%26brand%3DChevrolet&_trksid=p2380057.c101524.m146925&_trkparms=pageci%3A321a5761-e745-11ed-b5de-02cea4bef6ea%7Cparentrq%3Ad1cb88ae1870a0d30c1d883effffe56a%7Ciid%3A1
Good detail information
Mts
great video I have been running mfi for years . would have been very helpful in the beginning . It was a learning curve for sure once sorted out it is pretty simple . Thanks for contributing to the sport
Another great,informative video thank you
Great stuff!
To test secondaries or High Speeds, us a single gauge only.......K.I.S.S. You'll see immediately at what pressure the poppet or diaphragm opens. Also, submerge the secondary (with a pigtail) in a bucket of water for the most accurate result of leak.
Excellent information thank you
Good info,we run a Kinsler set up on our landspeed roadster, it’s a challenge for sure,some say with a scoop don’t run high speed then others say to run it. It’s the great whit dyno and this year we will be running the high speed,just a challenge to figure when to bring it on as far as RPM which turns into which spring ect.We will use a pill in the can so not to lean it to much
Thats good stuff Steve, what kind of speeds do you get up to and what motor? Thanks and cheers!....
@@digitaloverdrivesystems our best with the old motor is 213mph,she was old tech and it turns out the #12 Brodix heads went soft.We spin her up to around 8000.New motor should be a huge improvement,more inches and lots more head and cam.I will be happy if we get in the 220s this year but the goal is 243 for the record
Sorry,it was 372” new is 394”, winburg,cp,all pro,Jesel,bow tie block ect
Awesome thanks
I am building an MFI Harley & came across your videos when I was researching secondary valves, & spring pressures between the bypass valves and secondary, & all that goes in with designing a system. And have to say that that these videos were really informative & very helpful to me. As you know, there isn't a ton of information that can be found at the same source, its kinda all scattered around, & you have to hunt the info down. Anyway, I wanted to let you no, that I will be coming back to visit these vids, when it comes time to assemble the system. Also I will be building one of those digital leak down testers to test the valves, to really dial them in, Im ordering the parts now, so I have them here to build it. I even found them orifices at McMaster & Carr...
Thanks Leonard, I am glad my efforts helped you out some. Please subscribe if you haven't already.... Cheers!
Thanks for taking the time to explain all this cool stuff! Aren't the standard "average" quick disconnect air fittings 1/4" NPT?
Good catch, yes you are correct. I too noticed my mistake after I posted it.
Wouldn't the nozzles with the 4 air bleeds be creating a basic vacuum leak, or fast idle?
Yes, exactly what I was trying to explain. Guess I didn't make it clear.... Thanks
@@digitaloverdrivesystems I understand the need for the air-bleed, but I am surprised that there is not a foam filter over it to prevent dirt entering the bleed which can partially or fully plug it and/or ultimately enter the engine as unfiltered air. I would find a way to attach a small filter to the nozzle to prevent that.
@@reason2gether They make a small filter that slips over the brass called a "biscuit" to do that. It is definitely used on dirt track cars. www.amazon.com/Kinsler-Nozzle-Filter-Biscuits-externally/dp/B0184JX4CY Cheers!
I think your video's are GREAT! I am new to MFI, I run a SBC (429) hi helix 6-71 on methanol. Hat injection, 12GPM pump, (8) hat injectors .046. currently running a 5lb idle check and 150lb high speed check, main pill is at 105. Cant seem to get the idle down below 24/2500. .006 on butterfly's, 80% leak-down on K valve. Air bleeds on injector base, could my idle check be to low?
Please keep these videos coming. Thank you
Butterflies are too wide in my opinion. Try setting them at .003 and bump up the idle press to richen up a taste at idle (slow engine down) see how it idles. LMK what you get... Randy
Late to the party, but what would happen if you spray the fuel back up towards the throttle blades? Would it give the fuel more time to vaporize?
I don't believe you would improve on atomization by squirting away from the intake valve. Check out this vid to see just how violent the intake charge is when injecting at high pressure. czcams.com/video/RaN165eLgYU/video.html Also, albeit very brief, you may experience a tiny bog when rapping the throttle from an idle position, as the fuel charge will need to change direction before it enters the engine. (The butterflies will already be open) Additionally, most seasoned MFI guys use nozzles below the butterflies, unlike those in this video. Look closely at the difference between the left and right banks as the butterflies open, and their relationship with the nozzle spray... This is just my opinion.... Cheers! If you haven't, please consider subscribing to my channel.
I do not believe the AN threads are exactly the same as pipe threads. close but not the same.
You are probably right, but they are really close and worked fine for the test. I also made a mistake in that segment calling it a 3/8 npt. It was actually a 1/4 npt quick disconnect male in the -6 coupler... Thanks for the note. It tells me somebody is at least looking at my efforts..... Cheers!