FiTech Fuel Injection for a 170ci

norm02

New member
I recently saw where FiTech has come out with a system that would work on a six cylinder application and it’s got my attention. I’m wondering if anyone is planning to try it out and I wonder if it could adapted to the intake the same way that a two barrel carburetor would be. Any thoughts on this and would a DUI or a DSII work with it?
Link to product:
http://fitechefi.com/products/39001/
 
The issue with adapting the log is that fuel distribution is still a problem and when you run the o2 sensors, itll be going nuts trying to lean it out, then richen it and back and forth. You'd have to cut off the intake and make a special adapter to where the inner 2 runners are kinda wavy to make them slightly longer and thus make all tye runners pretty much the same length.

I read an article on this once and this is the way to do fitech on these l6s. The biggest deal is to make sure all the runners are just about equal length.

Good luck
Ryan
 
i agree with ryan on this. however i was thinking that if two of those units were installed, things would work much better, except that you would have an excessive amount of airflow capacity that might cause driveability issues.
 
rbohm":3135iflc said:
i agree with ryan on this. however i was thinking that if two of those units were installed, things would work much better, except that you would have an excessive amount of airflow capacity that might cause driveability issues.
2 1bbl fitec (if that exists) might be fine and have them go through a single air cleaner. Like close off the center one, and make 2 adapter on either side. But the outer ones would run slightly lean though. If placed over 5 and 2, 5 would branch into 6 and 3, and 2 would branch into 3 and 1. I would think 2,3,4,5 would run about the same but 1 and 6 still run slightly lean. Im a college kid, what do i know haha. Just thinking
 
if they had one barrel fit tech EFI, then three of them done like the offenhauser 3x1 set up would do great.
 
U can make any kinds runner U want frm the thing to the equal length runners.
Think how the tubes ona exh mani run to a collector ( cancels out the 'unequal length').
B weird lookin on these non x-flow engines...
 
rbohm":1lnudk5a said:
if they had one barrel fit tech EFI, then three of them done like the offenhauser 3x1 set up would do great.
I was trying to think of doing the least possible but yeah 3x1 would be great. What about the vaporizer? It looks like an Autolite 1100 but is something more. I dont know much about it
 
StarDiero75":2jgslj3a said:
I was trying to think of doing the least possible but yeah 3x1 would be great. What about the vaporizer? It looks like an Autolite 1100
Think bout ur Holley 5200/weber 32/36 DCEV - it has air'n gas jets (moung odder stuff). The vaperizor (Poney Carbs & oem) had a single nozzle w/many holes steada one. It simply made the gas mix w/air better, as it came out. So it IS a 1100 (n may B a 1101, lets C wha da experts say).
 
So I’m still contemplating this and I’m having a hard time understanding why a system such as the Holley Sniper wouldn’t work well for this motor. If it comes with an 02 sensor and can “self learn,” why wouldn’t it be able to adjust fuel trims at various engine speeds? Has anyone on this forum tried the Fi Tech or Holley Sniper system?

Holley Sniper
https://www.holley.com/products/fuel_sy ... s/550-849K
 
I think the 2V FI tech would work great on a Log head motor! I'm not on bored with the though it won't work do to distribution issues, it that was the case a Carb wouldn't work either. Optimum/perfect no, but all the same, it should work fine.
 
My employer works closely with both FiTech and Holley ive had these units in had a few times and both are very well made. Firstly ill say that while these work on a heap of applications there are some that they would be "lack luster" on. The injectors only drop to about 40% duty cycle meaning even when its trying to cut the most amount of fuel possible it my still be running pig rich. So i dont know how well they would work on a 144 or 170 but they would work decently on a 200 or 250. These units can have a tune uploaded to them so you might be able to fudge numbers here and there. I dont know that the FiTech units allow for timing control but the Holley ones do, these typically require dizzy lockout and adjustable rotor setup, would likely work best with a HEI based setup.

Secondly, these engines were designed with the idea that 1 and 6 are likely to run lead and 3 and 4 are rich, thats how ford designed the thing and they spent more time and money engineering it that way than most of us make in a few years, so ill trust they had some thought behind it. I will agree changing the setup to better the fuel distribution would help in general but isnt necessary. If you decide not to, i would go with a header and put the o2 sensor in cylinder 2 or 5 to try and get a "midrange" fuel signal.

Past that i think these units would be awesome ive definitely thought about doing so but just not 100% sure i want to pull the trigger on one and spend all the extra money on a system that still requires finding someone to do a head conversion at the least or purchasing the VI head.
 
62Cometman":2tlm1mt8 said:
on a system that still requires finding someone to do a head conversion at the least or purchasing the VI head.
I rarely go over to the FI Forum here.
What's the "... head conversion needed..." Just a mill pass like the 2v conversion (I'm not talkin bout the under hood space, just the ability to run).
Would it need dizzy block off & trigger wheel - the 2 changes as well (shown ona thread or 3 here)?
 
Machining for 2v conversion would be necessary, which in my neck of the woods with the scarce machinists we have would be like finding hens teeth. Most dont want to take on that kind of project :roll:

As for the dizzy just a standard lockout and adjustable rotor is all that is needed they still use the standard magnetic or even point style pickup as a cam based trigger for both fuel and ignition timing. They dont need a trigger wheel since all the cylinders share the same "injector" it just has to create a pulse every time a cylinder opens the unit doenst care which one it is unlike MFI units where you have to tell it which cylinder so it matchs the firing order. Pretty slick setup and it works well. Most Megasquirt systems can be made to do the same so if someone finds a different TBI based system they want to use. I will also say that unlike GM tbi setups these systems require high fuel pressure standard with other EFI setups, 50-60 psi, the FiTech limit is 56psi when the regulator bypasses, but 50 or more is what it requires to work properly. Also these can be run as a returnless system but to make the pump last the longest and reduce wear a return line would be recommended.
 
I stay out of it as much as possible, altho it intrigues me.

If the CI/VI intake fit our head I'd wanna put on the 'sequential fired" (I think it's called) or that type of FI (rqther than throttle bodied) by utilizing the supplied bosses (take a look@ one) w/6 injectors. I have not researched it all (other components needed, ect) but would even take 1 of the spare heads here & lop off the log...

My real interest is the 6 Keihin motorcycle carbs but a pre-made linkage eludes me (& may B located in Great Britai?) either of the:
Harley CVH, MX-FCR, PB, FCR, CRS, VB, CDK, PD, PE 34/38, PJ, PWK, BD, PWM, BH, PE 26/30 w/correct cfm
ona 200 but I've not got access to one (money money, Mounnn-Nee).
Continue the dream? OK - a round body chero or 4 dor wagon w/AOD (B4 electric) as I just moved "to the city" & am closer to 70 y/o than 50.
Ak had the cycle carbs tested (Mikuni) 50 y/ago. I think U can c'em in commetman's mag. articles @ beginning of this forum's index...
 
I called Holley and spoke to one of their Fuel Injection specialist yesterday. He said the Sniper system will work with either a DSII or a DUI ignition but there would be no additional timing control if you use one of those ignitions. That’s not huge a detriment since the system can self-learn but it would be nice to be able use all of the additional features the system has.

They also confirmed that the system would work fine on a Ford 170ci. They sell the same system to people who are running Toyota 4 cylinders and even VW Beetles so lack of cubic inches and CFM needs shouldn’t cause any issues.

It’s something that I’m going to continue to give serious thought to but I’ll probably see how things are going after adding a header and DUI first. If that gives me the added performance and drive ability that I’m looking for then I may stop there.
 
You could use the DSll distributor to trigger the Sniper then have the Sniper control an MSD box.
 
You may be able to get timing control with the DSII using an 8-pin hei module. Mech advance locked down of course, and you may want to or need to re-phase the pickup. I know this works for timing control with GM factory type TBI conversions.
 
gettin more interestin now...
 
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