Fuel Cone pics and free HP ?s

[ndurbin]

Does anyone have some pictures of a custom ground fuel cone?



I'm helping a buddy turn up his '93 4x4 5spd. He already has an upgraded turbo (don't remember if it's W1HC or an HX35 but it has a smaller exh. housing) and has played with the fuel screw alittle (back to stock at the moment I believe). We'll probably end up grinding the fuel pin and getting some PODs. Any other ideas for some free ponies?



TIA

Nathan

 

[Greenleaf]

Oh boy... ... ... . nothing comes free you know.



I just don't know. Your working with a VE not a P pumed unit. Your pretty limited in HP potential.



You could try to remove the pump top housing and cut the AFC control arm away or something like that. That might give you 400 hp if you can get air into that engine.



Good luck.



GL

 

[ndurbin]

Well my baby 160hp P-pump is a bit limited itself compaired to some of the others.



I thought about that when I was reading another post, but I need to talk to him on how much power he wants and if he's going to keep it that way. I was going to have him try and pick up an extra fuel pin and cone (from an earlier truck) to grind on if it isn't going to be permanant.



Thanks

Nathan

 

[Greenleaf]

If he will be putting the truck to work (as opposed to simply driving it) and you turn the juice to her, he'll have EGT problems. The next step would be gauge set and turbo upgrades among other air in/air out upgrades.



When turning the juice to her you also have to take in account the emission regulations in your area. You "may" have to go backwards when that time comes to pass the test(s).



Keep that sorta thing in mind.



GL

 

[ndurbin]

Well we're making alittle progress on the truck. We were all set to grind the fuel pin today but when we pulled it, kinda threw us for a loop. The top half seemed alright but the bottom half looked like an inverted cone (wide end towards the bottom of the pin). We were afraid to grind on it since it was so skinny at the top. So we played with the star wheel alil. Actually think we turned it the wrong way as we turned it counter-clockwise. But the truck seemed to run a touch better.



He does have gauges so we can tinker away with it. He's using it to haul crushed cars and other things on a 30' gooseneck.



Nathan

 

[BushWakr - RIP]

Don't be overly concerned about the thickness of the material at the "throat" area of the cone assembly... . it is actually pretty hard material.

Most guys do their 'grind' on the area of the cone that is the 'rich' setting so you already have a good starting point in terms of throat depth... . you can take out almost half of the remaining thickness and still have a very reliable and durable cone.

Keep in mind that the pressure put on the cone itself is actually pretty small ..... look at the guide pin that rides on the cone ramp and you'll see that the amount of pressure it puts on the cone is really quite minimal.



pb... .

 

[tugboatphil]

Here's what mine looked like after I got it custom ground at Smokehouse Diesel. Sorry for the poor resolution.

 

[ndurbin]

Thats just about what this one looks like.

 

[bgilbert]

Oh Phil..... much more to take off there bro:-laf!!!

 

[Greenleaf]

What Phil's pic does not show is that the narrowest portion of his cone is paper thin. If he had turned it a tad more and has a lighter backgroung it would give a better understanding.



I for one don't like the cone approach and simply opt to bypass the internal regulation. Fellows that have any sort of emissions testing cannot do so and have no other choice.

 

[JLEONARD]

 in terms of throat depth

So we are grinding a "deep throat" fuel pin are we?



I had the opprotunity to test run one of those custom ground pins... I was amazed at how thin the throat was. Didn't measure it but I'm thinking it was well less than 1/16".

There's really no load on it to speak of... . just don't drop it!!

Jay

 

[Moab4x4]

Did I go too far?

Last night I ground the fuel pin. I first measured the diameter of the most narrow portion to be ~ . 150". I then figured that if I took half it should be about right. I ground the deepest side until I had a throat depth of . 075". I left the first 1/8" or so of travel stock for fuel mileage and then ramped it down fairly evenly to my low spot. After polishing it to a shine I was thinking how to test it to see if I would then have full guide pin travel over the travel of the new cone. DUHHH! I had the top of the pump off to replace the throttle o-ring.

I put in my modified cone and applied finger pressure to the AFC foot while moving my fuel cone. The foot bottoms out with the guide pin fully into the bore with about 3/16" left of travel on my custom pin. I ground too far!

Thinking of the warnings here of fuel leakage, did I go too far? If I push the pin into the bore, it goes in to the point where I can barely see the tail of the guide pin. I am guessing 1/16-1/8". How far in there is that O-Ring????



My . 02. It is easy enough to pull the top off. Grind a little and test for full guide pin travel. That way you will actually be using all your ramp and won't go too far like I did.

Ken