Cam opinions

[351m]

As far as the cam, I have been doing alot of reading, and am still unsure where to go as of yet. the more I read the more it is looking like a 5.8 is more the way i need to go. I am a fan of EFI but not in this case. I am starting to feel as if I am looking at doing the fuel pump along with the timing chain and various other goodies. So with the only thing for a carb swap still needed being the fuel pressure reg ($50 from a buddy) or just swap tanks with the Mark VI and do some lines, I am still alot cheaper then staying efi.

Oh yeah, here is a link to the twin of that other car...

http://www.cardomain.com/ride/3112383

It is kind of shitty if not of the sheet metal will mach as the fenders and fiberglass are near mint on it. Alot better shape than my vic, though the rest of the car is toast sadly.

[1987cp]

Who all so far is doing this routine of running the SEFI fuel pump though a 6psi regulator to feed a carb? It does cut down a lot on the amount of work required to feed a carb, but I had been under the impression it could lead to reliability issues ....

What carb are you getting?

[Bowman85merc]

we're still running the in tank fuel pump from when it was cfi without regulator.
we haven't had any issues with it yet, what the carb doesn't need is being returned through the return line.

[351m]

I will be running the factory Motocraft carb from a 1983 302 AOD Cougar on it so it should be reliable enough that way. Plus, even if the in tank pump goes, I won't feel uneasy about buying wrecking yard ones for $25 each and running them till they die as they really only need to deliver enough to keep the bowl full.

[1987cp]

How do you have a return line with no regulator?

[Bowman85merc]

I'm just good like that

but what i accually have is a T fitting in there, so what the carb doesnt use is just sent right back to teh tank...with the stock CFI fuel pump, it keeps a steady 7-9 PSI...and since there's a T and it goes back, it will never over power the neddle/seat and flood it.

[351m]

I have a feeling I shouldn't be trying that on a 45 psi system though as I am sure that is only what 15psi going through the CFI system?

[Bowman85merc]

they do sell a 3 port regulator for that purpose. we didn't want to spend a $100 on it so we just tried t'n it, and so far it works for us.

[351m]

yeah, i used to have a holley part # for one too... Oh well, I will deal with it when the time comes.

[gadget73]

I have a feeling I shouldn't be trying that on a 45 psi system though as I am sure that is only what 15psi going through the CFI system?

Its somewhere around 40 psi for CFI if I'm not mistaken. The pressure is controlled by the regulator anyway. Fuel pump isn't much different, and the stock CFI pump works on a SEFI application.

[351m]

That would probably explain why the Tee works then, as long as the flow to the carb has slightly less restriction then the return line... Well, latest update with this carb swap idea...

My buddy's dad rasied a good point on this... He had a '74 F-250 4wd with a 428 running 13:1 CR on propane. He said just grab a 351, get a bit of compression in it (11:1 minimum) throw a decent cam in there and the 4 barrel propane system from my truck. Should push a decent amount of horsepower that way and be fairly cheap to drive. His truck was around 450-500 horses btw.

[ss_mini14]

i wouldnt put a propane tank in a car. when it heats up and pressure builds in the tank a safety valve releases the excess pressure (fuel) into the atmosphere (or your trunk in a car). start the car on a warm afternoon and make a tiny spark and you could have a very bad day.

[351m]

I have an 80+ Litre triple manifold tank that bolts to the frame under the trunk that I robbed out of a '96 Vic taxi.

I don't know the laws, there but in Canada, if you have them in the car the pressure relieve has to be vented outside and they are usually inside an enclosure that is also vented around the fill tube and through the floor.

[1987cp]

That sounds like a sensible way to do it regardless of your local laws. I like the idea of propane-powered engines. I actually felt somewhat tempted when I saw Craftsman's new propane-powered string trimmer in the latest advertisement!

[351m]

Little bit of an update... In an attempt to keep the FI and run the whole dual fuel system from the Taxi, I have now power timed it, that helped ALOT with the power, it sounds much smoother and pulls hard compared to what it was before. I also got ahold of a fuel pressure guage, and here is what i found...

Idle with the reg hooked up I was getting 38psi
Rev it and hold at half throttle it would jump up to 42 then drop back to 38
Vac line to the reg plugged I had a steady 42 as far as I could tell.

I have no idea how close this would be with real world driving but it seems good to me.

I pulled the plugs out and they were white, Lean?