Jenvey Heritage EFI

[fj20spl311]

CHEAP!!!!!! Not the Heritage ITBs but maybe they are available.
I don't know this ECU, but a crankfire SDS is EM-5F is $1575 + ~$1000 for the TBs and $100-300 for the fuel pump and regulator

[mtresillian]

Phil
Chokes are used to generate a pulse signal to the carburettor to draw fuel. Not necessary with EFI. And as mentioned above the EFI spray gives very good atomisation of fuel. I'd drop back to 40mm rather than choke the current 45mm setup as the restriction will add to turbulence. Remember that the 50mm Solexes ran 43mm chokes so engines worthy of 50mm Solexes didn't need that 50mm bore. And as you'll know the flow is limited by the greatest restriction. So 45mm on a sub 200hp engine is a bit big by the suggested numbers. Lou has always said the same to me. I inherited the car with 45mm ITBs. I plan for a 2.2L Lou stroker and will let him decide if I should drop to 40mm ITBs when the time comes.

All that said, the phenolic spacer is the restriction in my intake at the moment. What happens to it will depend on the final size ITB I end up using. You can see in the pic. (Well and also the need to match my manifold to the intake port)

IMG_20170618_234057.jpg

[fj20spl311]

I already have the 45 mm TWM throttle bodies, so I am hoping for modifications as a work around to buying new ITBs.
Isn't the flow through a venture greater than that through a straight tube of that venture size?
While I agree that the addition of a choke is not necessary to generate a pulse signal like for a carburetor, I have no idea if that's it only effect. It will increase the velocity of the intake and may have some effect on the reversion. I know very little about the wave effect. Just trying to get back to the performance on Carburetors.
The first engine builder I worked with was very old school. He believed the intake should be a series of Venturis. Most likely the reason it worked so well for him is he tended to keep his port sizes smaller.

[Gregs672000]

I'm resurrecting this thread... any updates, new systems, successes or failures?

[redroadster]

One wonders if they ran into emmissions regulations law conflict on street cars

[Gregs672000]

One wonders if they ran into emmissions regulations law conflict on street cars

Mines a '67, so no issues there, and EFI will be waaaaay cleaner than my Dellortos!

So, I'm pretty sure I headed this direction, just trying to figure out how to pay for it and when. I've just sent an email to Emerald3d.com who offers up complete systems with or without ignition control. I'm inquiring about the Jenvey Heritage DCOE replacement set up as its a nice compact and complete set up that looks like Weber DCOE carbs. Pricing is a bit unclear yet, but I'm seeing $2300-2600 for their conversion kit (with traditional ITBs?), sure it will end up being more. It will require a fuel return, which my early car does not have... will a later car fuel return work, and if so can someone describe what came on the later cars, how it connected to the tank, where they ran the lines etc?
Anyone else running EFI with ITBs now? I know Gary Boone went EFI but sold it...
Thanks all!

[redroadster]

A modern efi tank that fits or made to is easy est

So many bosch CIS systems made , Id bet there some to be had cheap and no crank sensor. Or ecu. Runs of high pressure pump with a fuel distributor. Plastic tank best. The air box is kind big but easily reduced
https://www.ebay.com/p/114967866?iid=32 ... JREALw_wcB

With this $190 ...a $100 pump & wiring ...4 injectors $75 ea
Lines to injectors, rubber intake tube modified to carbs...F filter ,wiring to unit and relay box $200. =800
Salvage yard score maybe 100 off

[spl310]

if so can someone describe what came on the later cars, how it connected to the tank, where they ran the lines etc?

Greg,

IIRC, the return line ran down the transmission tunnel and connected to a bung on the fuel tank. A late tank and some tubing and you can duplicate it easily. IIRC, that was 5/16 line. I can't help with the fuel pump setup - one of the engine swap guys can do that though.

[redroadster]

Seriously ...the return line got you stumped
New designs have a one way check valve ...in case of inverted roll over
In the 2000s many mitsu, nissan had a no return efi pump
The regulator on the eng. Blocked set pressure and a press relief valve in the pump blew out or turned it into a suction throttle

[Gregs672000]

Nope, not stumped, just ignorant, which is why one asks questions! A wise man is one who knows he doesn't know it all; a fool is one who thinks he does. Which are you? Humility is a strength my good man...

[Gregs672000]

Well, after much research, my plan is to fuel inject the Roadster via Jenvey Heritage 40mm DCOE ITBs. They are spendy but they look very close to Webers, and they're a nice, complete unit. I just don't like the look of typical ITBs. Since I already have ignition control via the megajolt, I don't really need a system that offers spark control too, and that means a Microsquirt is the perfect controller for me, and a lot less expensive than most. Tuning is via TurnerStudio, a free ap. I'm going to need to upgrade my wideband as it doesn't have an output for the controller, so that will be up for sale before long for someone who needs a good wideband for carb tuning. I hope to get this done this summer, but if not it will be a winter project. The biggest delay will be how long it takes to get things out of England and through US customs. My new air filters sat in customs for over 6 weeks before suddenly arriving.
I'm excited. I think this is really going to improve this engine, and help it run a lot cleaner with better fuel mileage. Most recently it got 27mpg and that was mountain driving, and I think that's a lot to do with getting the timing right. Now, fuel!

[JT68]

Greg, I'll put it up a separate thread too, but you might check with Jenvey to ask if these use original design Weber linkage-I bet they do to maintain the correct original look. Anyway, we now build CORRECT Weber linkage to perfectly fit the solex manifold, so you don't have to cobble together some thing 1/2ass that looks that way. There is no off-the-shelf Weber linkage that fits or works. Most folks don't understand, if the linkage is crap, the carbs (or ITB's) will be forever going in and out of sync and tune. Naturally, your old 'Dell linkage doesn't fit Webers either. (we looked at making Dell linkage and its different too)

Also, if you change your mind and decide to run Webers, you are all set. I'll post photos in the other thread..

[Gregs672000]

Thanks JT, I actually have a question into them about linkage and have sent pics of what I have now (modified Mikuni linkage to fit the smaller Dellorto shafts). I have a collection of arms etc, but we'll see. You're right, a very important piece... I'll be checking into it shortly, thanks!

[spl310]

(modified Mikuni linkage to fit the smaller Dellorto shafts).

Welding?

[Gregs672000]

(modified Mikuni linkage to fit the smaller Dellorto shafts).

correctly
Welding?

Well, I considered several options, including welding them up and recutting. The Dellortos have smaller diameter throttle shafts, so stock linkages for Mikuni etc are too wide to grab the shaft properly. I had some thick Dellorto washers that fit the shaft correctly that I carefully aligned and Gorilla glued to the Mikuni linkages. Has worked perfectly for years. I had to similarly modify an arm for idle. During that time I discovered it was important to have that be controlled by the rear carb as otherwise it would not balance correctly. I have some left over linkage parts, one in particular that may work, but I have since heard from Jenvey that they don't offer anything to allow the linkage to pull up vs push down as on Webers, though they offer a universal linkage that could be made to work (it's ugly though IMHO). I'm sure with my stash and/or JT's set up I'll be able to have something reliable and accurate.
The more I look at this the more excited I become. Love YouTube. Watched a guy use the auto tune feature of TunerStudio (registered versions get access to that and several more features vs the free version, costs $50 as I recall). He set his desired A/F ratio, then carefully drove around on his existing map while the computer auto adjusted each cell and under different loads/rpms... way cool. My engine needs This! No carb can do that. SOON!