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FrankenFerrari - V12 ferrari 308 part 4
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Author:  mk e [ Sun Nov 28, 2021 4:09 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
Had oil lines swapped to the filter, that took some time and a bit of an oil mess to sort but there is now 20+psi cranking - check

fill the coolant...hmm..nothing going in....front down, back up and 3 gallons in the last 3 were a waiting game while the thicker Evan's stuff leaked passed the pump and t-stat I guess. - check

fuel pump on...silence. just a wire pulled off the fuse block while I was troubleshooting the tach issue. Pump on....fuel on floor. Looks like the fuel rail is leaking into the V somewhere so the intakes need to come back off and that is a 5-6 hour job if I don't need new o-rings.

Sadly, that will conclude testing for today.
Author:  TheDarkSideOfWill [ Mon Nov 29, 2021 10:58 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
Congrats! Getting to the point of finding leaks is fantastic progress!
Author:  mk e [ Mon Nov 29, 2021 7:16 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
Pulled the manifold off and didn't really see the smoking (or leaking) gun but o-rings didn't look great so I ordered all new, be here Wed. In the meantime I'll get everyt5hing cleaned up and ready to install and maybe have another look at the tach.
Author:  MerlinTech [ Tue Nov 30, 2021 8:20 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
Ughhh, so close. Can't wait. So excited for you.
Author:  mk e [ Tue Nov 30, 2021 9:52 am ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
When I was cranking the engine to prime the oil pump I noticed I had like 10psi oil pressure and thought it fine....but then noticed I also has around 10psi fuel pressure with the fuel tank empty and pump off. Last night I discovered that the pressure transducers read just fine on the bench but when they are installed and the chassis grounded they have a 0 offset...270mV on the oil pres and 330-370mV on the fuel as it drifts around 30-40mV. These are 2 brands from Amazon, as typical chinese stuff they look the same other than the marking on the casing...both are junk it seems. I'll try 1 more where a couple reviews specifically mention no/low offset for fuel (don't care about the exact value for oil as long as its reading something so I know there is pressure and I can remove the offset in the ECU easily) before ordering a $200 Honeywell version cuz I do need to know fuel pres to calculate the correct mixture
Author:  mk e [ Wed Dec 01, 2021 4:30 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
The new fuel pres sensor is much better, 71mV offset and seems stable.  The oil pressure still reads 0 with the 270mV offset so it appears stable. 

The manifold o-rings came yesterday, I bought 3x8mm instead of the standard 3x14.5mm to make it a little easier to assemble and they seems fine.  Just waiting on UPS to bring the rail o-rings now.  The plan this time is make sure the injectors are seated in the rail then pop in the manifold end because the fuel needs to be sealed but  a small vacuum leak doesn't really matter so I want all the risk shifted to the manifold end as best I can.
Author:  mk e [ Wed Dec 01, 2021 11:26 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
Well...its almost sealed this time. It looks like a mist coming from 1 injector on the end. Hopefully 3's a charm.
Author:  TheDarkSideOfWill [ Thu Dec 02, 2021 1:36 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
mk e wrote:
Well...its almost sealed this time. It looks like a mist coming from 1 injector on the end. Hopefully 3's a charm.


It's really the injector o-rings? I would have been reluctant to tear down the assembly until I had identified the leak.

You do use a little engine oil on the o-ring to put those joints together, right?
Author:  mk e [ Thu Dec 02, 2021 3:29 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
TheDarkSideOfWill wrote:
mk e wrote:
...It looks like a mist coming from 1 injector on the end..


It's really the injector o-rings? I would have been reluctant to tear down the assembly until I had identified the leak.

You do use a little engine oil on the o-ring to put those joints together, right?


I'm pretty certain what was leaking , I could see it. first assembly I used WD-40, second time silicone grease both worked well at getting the o-rings to pop into place nicely.

This is a challenging assembly. I didn't have room for 2 fuel rails or to assemble the rail to the TBs then drop the assembly into place so assembling relies on everything flexing enough to pop into place.
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I'm now believing that I got the positioning of the rail mounts a little off and I'm torqueing the rail just enough to cause a leak. Tonight I'll cut and reweld the loop on the end so the rail bolts just as it sits naturally
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Author:  mk e [ Thu Dec 02, 2021 9:55 pm ]
Post subject:  Re: FrankenFerrari - V12 ferrari 308 part 4
I decided the rail wasn't sitting just right so I sawed the end off and repositioned it a bit....and then there was fuel pressure

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