1985 Monte Carlo SS known as Barney

[waynieZ]

Must have been tough to get to sleep after that delivery.

[SSLance]

One of the things about my EFI install that bugged me was this.




Because I used an internally regulated fuel module, I ran just one fuel line up to the engine and dead headed the other end of the fuel rail.

Here you see the -6 feed line attached to the rear port on the fuel rail with a plug in the front port.



Apparently it is common with a dead headed system for the injector pulses to send vibrations back through the fuel line. This is what is causing my floor to vibrate. Here is how the fuel line is attached to the floor under the passenger foot well.





What is strange is if one or the other clamps is removed, the floor doesn't vibrate.

I heard of fuel dampers possibly working to quiet this down so after a little investigation, I picked this up.



http://www.radiumauto.com/Fuel-Pulse...Kits-P751.aspx

This also gave me a place to put my new Holley Fuel pressure sensor. I then built a bracket to mount the damper and sensor to the firewall.



The 90 degree -6 Hose fitting on the existing fuel line attaches to the input side of the damper and I'll have to make a new fuel line to go from the output side to the fuel rail once the engine is back in place. The fuel pressure sensor will plug right into the circuit on the Holley harness and then I'll be able to verify and log fuel pressure with the ECU.

Hope to have a progress report on the engine itself soon.

[WSSix]

Wild. I've never heard of the fuel line causing an issue like that.

[andrewb70]

Originally Posted by WSSix

Wild. I've never heard of the fuel line causing an issue like that.

That's because modern EFI engine have fuel dampers built into the fuel rails.

Andrew

[SSLance]

Originally Posted by andrewb70

That's because modern EFI engine have fuel dampers built into the fuel rails.

Andrew

So, think about this as well. Modern fuel rails are all sequential fire, so 8 smaller injectors firing one at a time. This setup has 4 larger injectors operating in batch fire...so all 4 hitting at once each cycle. Much larger hammer effect back on the fuel line.

[SSLance]

We have progress to report...look what's back on the lift once again!!



The builder is very happy with how the crank turned out, says they did "exactly what he asked them to do". He said it spins over very easily with the mains torqued down.

Here are some pics of the short block assembled.





Some of the additional clearance work he did to clear the new rods.





He should have it wrapped up by the end of this week if no more hiccups.

Looks like I need to get busy prepping the hole it's going to go back in...

[WSSix]

Very nice! Glad to see it's coming together for you, Lance.

[SSLance]

Took care of some piddly things today in preparation to put the new bullet back in place. I moved the oil pressure sensor from the boss above the filter to this boss up by the distributor. This keeps it away from the headers better and will give a better representation of the oil pressure on the top side of the engine.



Also got the distributor back in place finally...leveling the engine out helped stand the oil pump drive straight up and centered which let the distributor fall right into place.

Since I moved the oil pressure sensor and added a fuel pressure sensor, I had to dig into the bundle of wires under the AC and on the firewall and since I was there anyway, I cleaned them up a bit. The fuel pressure sensor lead to the ECU was tucked up under there last summer since it wasn't being used




May not look like much but it's MUCH neater than before.





Cleaned up the alternator plug as well.



I then used a tap to clean all the bolt holes in the heads and block and put the engine mounts on. This gets me pretty close to ready to put it in the car. Might get around to that tomorrow, we'll see how it goes.

[ScotI]

Clean engine compartment.

[SSLance]

15 minutes from this...



To this...



And that included taking the hood off and putting it back on and lining it up.

I might have just a bit too much practice at this...