Jenvey Heritage EFI

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TurboRagtop
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Re: Jenvey Heritage EFI

Post by TurboRagtop »

Greg, nice to follow along on your EFI journey, you are doing great.
One thing you will be pleased to know is that the longevity of your engine while running EFI will be significantly improved vs. running carbs.
I worked at Ford (1985-1995) when every engine they made was transitioned from carburetor to EFI. Even hard-core engine professionals never saw this coming: suddenly on every new EFI engine, the warranty claims for upper cylinder lubrication issues (cylinder wear, ring pack wear, piston slap, skirt wear, you name it) drastically dropped to near zero. At first nobody understood why, then they linked it statistically to the change from carb-fueled to EFI fueling. It makes that much difference, not dumping raw (liquid) fuel into the upper cylinder!
Karl Payne, Gilbert, AZ
1966 1600 roadster, 2.3L EFI Turbo Ford engine, FMIC, 2.5" exhaust, T-5 trans, 300ZX big brakes, stand-alone Megasquirt ECU/TunerStudio
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msampsel
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Re: Jenvey Heritage EFI

Post by msampsel »

Very impressed, seeing these transitions from the Dellortos you have been so fond of, to EFI.
Thing I dislike most about my Datsun is the emission smell. Did you consider adding a Cat too? :)

It looks like a tremendous amount of work, and it payed off.
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78 911 SC Targa (Severe Oversteer but still loved)
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Gregs672000
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Re: Jenvey Heritage EFI

Post by Gregs672000 »

Thank You! It has been quite a journey but it is working pretty darn good. I had the motor out for several months but I've finally been able to do some tuning and clearing some gremlins, and understanding the system, the data I can capture and what it means (that's still ongoing for sure!). I just made some timing adjustments now that the compression ratio is more reasonable and that has really increased torque, and I'm learning how to tweak the fuel map and enrichment systems to avoid lean spikes or over fueling. Autotune doesn't do it all, that's for sure! Power is up everywhere, fuel economy is up slightly. On a recent trip around Mt Rainier that included some significant warp speed blasts at times it got 26.5mpg vs 25.5 previously, and that was before the ignition timing changes. I'm finding cruising loads and rpms from the data logs and will see what i can do to improve economy in those areas by leaning mixtures and advancing timing some more, but thats really secondary to good, safe and consistently powerful operation. I did notice and appreciate that the engine performance didnt change with altitude changes in the mountains now that it can compensate as it didn't bog or hesitate at the top of the mountain pass if I hit it. I have been battling a mysterious injector issue in #4 (lean) that I thought was wiring but now may be some contamination, but I had the same problem in #2 as well and it cleared... maybe #4 too as it has felt smoother since running some injector cleaner the past two days, but I haven't checked the plugs yet.
I recently redid the rubber mounts for the external tank for the fuel pump and that helped quiet it up a lot, but I noticed it was a little loud with the hot temps the past few days... it definitely doesn't like warm fuel. I still need to get together with uncle Pat to see if we can muzzle it some. Sometimes you can barely hear it...
So ya, pretty cool stuff :D
Greg Burrows
'67 2000 #588
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Gregs672000
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Re: Jenvey Heritage EFI

Post by Gregs672000 »

Despite the fact that the car is more powerful than ever, I still have a significant problem in #4... this plug is way too lean. #2 plug was similar before but now appears nearly the same as the other two. #2 and #4 share common wiring as do #1 and #3, so at first I thought it was a wiring issue. Now I think it's an injector issue, possibly contamination from the install, but I'm testing the theory by swapping wiring and running new plugs. If it's wiring it will show now on 1 and 3; if its an injector in #4 it should read lean again. I need to put 50 or so miles on it to get some deposits to form before I will know. Unfortunately the injectors are not easily assessable by the customer per Jenvey, so I don't know yet how I will see about testing or clearing it, but I will! Zoom in: That plug is ugly and getting worse. The car would still blast to well over 100mph no problem. The orange color is from the Boostaine, which really helps to show how different they are. I look forward to fixing this problem! :smt003
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Greg Burrows
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Daryl Smith
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Re: Jenvey Heritage EFI

Post by Daryl Smith »

Greg,
Is it just me or is that a coating on those plugs?
The 4th plug being a totally different colour would be concerning...grey, but, still coated? It's like it is getting a different fuel.....No idea what would cause that, oil getting into that cylinder?
I would guess you are still running rich....What AFR are you running at?

You are getting decent milage, near the same as I have been the last few tanks, but, I'm running with a bigger gallon (imperial measure) so you are doing better than mine so far on a bigger engine....My plugs come out almost clean, just a bit of a pinkish colour to them.

Injector pairing for wiring should be the same as the spark plugs, 1 & 4 and 2 & 3...Although I'm not sure it really makes a difference for the injectors...maybe...the computer changes fueling by the millisecond, so, it could make a difference.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...
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Gregs672000
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Re: Jenvey Heritage EFI

Post by Gregs672000 »

Yes, the orange is the Boostaine, and it really shows the difference. I think the plug is over heating due to a lean mix and thats the color and blistering you're seeing. I've researched cleaning injectors and despite what Jenvey said it does not look like there's anything complicated with accessing the injectors. Still investigating...
Greg Burrows
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twistin
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Re: Jenvey Heritage EFI

Post by twistin »

#4 plug looks like coolant
Check diesel injector repair shops they should be able to help.
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2mAn
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Re: Jenvey Heritage EFI

Post by 2mAn »

Greg, I love this. Keep it up.

If it was easy everyone would do it
Simon
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Gregs672000
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Re: Jenvey Heritage EFI

Post by Gregs672000 »

twistin wrote: Wed Jun 09, 2021 10:39 am #4 plug looks like coolant
Check diesel injector repair shops they should be able to help.
I appreciate the input. I have not smelled any coolant burning nor lost any, but I'm open to the possibility that there could be something mechanical going on. All typical tests show no issues. I do have numerous pics of the plugs over time that do show a problem in #2 as well that has cleared. Especially in the first pics I took you can really see it was white but again I smelled nothing so I hope you're wrong! That is an angle I had not considered, so again thank you. Testing continues when the weather/family visit permits.

Thanks for the encouragement Simon, and it's always good to hear from you!
:smt006
Greg Burrows
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Gregs672000
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Re: Jenvey Heritage EFI

Post by Gregs672000 »

Original pic, then after #2 cleared. What looks black on #4 is actually whitish overall. I've looked at this plug closely and it appears to be blistering some from what I assume is increased heat. I will check into coolant more closely however. I have since replaced all plugs with new but need to run it for some time. I swapped wiring and tested #4 injector and it appeared to work fine... we'll see!
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Greg Burrows
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Re: Jenvey Heritage EFI

Post by Gregs672000 »

Update... swapped wiring, installed new plugs, cleaned injector #4 (at home with a pulse tester and pressurized carb cleaner... not easy but confirmed the injector appeared to spray well). First pic is after 35 miles, second after 135 miles... #4 continues to have problems, but #2 (while greatly improved from the earliest pics if you go back and look) also shows differences, except that it appears slightly richer than the others. This eliminates a wiring issue and suggests the problem remains with the injector OR with something else in #4 especially. I smell no coolant burning and mechanical testing (compression and leak down) has found no differences between cylinders. The final test will be to swap injectors between 3 and 4. If the problem remains in 4 then it's mechanical or an intake leak of some kind. I'm hoping that what I have is contamination from the install that went to injectors 4 and 2. They are first in line to the initial fuel feed through the new lines and internal fuel rail, with #4 being THE first in line for all and maybe the reason why it's the worst. Unfortunately I don't have a local injector testing place anymore, but will also consider taking them somewhere to be tested for flow. Any observations or thoughts welcome!
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Greg Burrows
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msampsel
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Re: Jenvey Heritage EFI

Post by msampsel »

Why not just drive it for 1000 miles or so? Seems it was driving fine right?

Wonder about temperature difference at various head locations? Can an IR thermometer detect any difference? You claim it dose not like hot fuel.

Just some rambling thoughts

Might try a different temp range plug in #4, see if it makes a difference?
67 1600 (Mods only a mother could love)
78 911 SC Targa (Severe Oversteer but still loved)