custom cut fuel pin

[rdodd]

Has anyone compared the difference between the pdr custom cut fuel pin and old smokies fuel pin? Also, i read that installing these fuel pins can result in fuel leaks on the guide-pin o-ring because it allows the pin to travel farther. How common is this fuel leak problem? Can,t a new o-ring be installed around the guide pin to prevent these possible leaks? I have been thinking about getting one of these pins but wanted to clear up a few concerns about them first.

 

[dpuckett]

I'm not sure if there are any secrets that I need not divulge, so I will just say the taper isnt the dunce cap- type cone like on the stock and DD pins. It is supposed to lower smoke, and increase top end/ higher boost power, and from the looks of the pic he PM'd me last spring, I can see how it would. Not sure if it includes a new spring or not. When I talked to him last spring, he was debating to re-spring or not to re-spring. If you have any questions, send him a PM.



i think Mike has gotten it so the o-ring in the AFC housing wont leak, unless yours is getting old and hardened to begin with. T replace it, you'd have to take the top of the pump off. Then you may as well put a 3K GSK while you're in there.



Daniel

 

[Greenleaf]

I think he was asking about the PDR and Mikes fuel control pin... . not the DD.



I may be wrong on this, but if you want to know anything about the PDR pin, inquire again.



Greenleaf



... . Solid..... (that ain't no thang!) :-laf



sorry, laughing at my own jokes

 

[rdodd]

I was referring to the pdr pin compared to old smokies pin. Anyone have any info?

 

[Greenleaf]

I have not tried Mikes pin. And another thing, I don't do a real good job of keeping numbers as to what the TDR fuel control cone does or doesn't do for me.



The last mod I performed prior to putting my truck into "cold storage" for the winter was the PDR pin. I've not seen any fuel leaks. I have not upgraded my turbo as of yet and resulted in very high pyrometer readings... ... . just by pushing the go peddle w/truck unloaded. I have operated the engine with the cone removed on mine and other engines to free up the pin. The pin will pop out quite a distance and yet to see a fuel leak, This of course is only done long enough to work the pin in/out to free it up with aid of light oil.



I can only offer you seat of pants logistics as I'm not scientific in my own R&R, sorry.



Greenleaf

 

[PPeters]

I also installed PDR pin about 6 weeks ago. Since weather is what it is here (snow and ICE), haven't really flogged it yet. But I can notice a seat of the pants difference. Need to get my gauges installed to do a baseline before putting in the PODs, HX35, 16cm housing. Also, no fuel leaks either (so far).



Pat

 

[dpuckett]

Sorry about that- I hadnt completely woke up yet the other morning. I have edited the above post accordingly. I wasnt even aware PDR made a fuel pin. (might be why I thought of DD). Guess they can get or make anything if you ask them. I'm going to look into getting one made by a machine shop here in the swamp as soon as I get my brakes stopping again.



Daneil

 

[sparks57]

Old smoky makes the best pin around IMO, period. He is making over 450hp with one. The PDR pin is reground from a stock pin, Mike's is custom designed and made in a machine shop.



I have one on hand, and plan on installing it this weekend. I will tell you more when I get it in. The Old Smoky pin will add 40-50hp over the stock cone at stock settings, and 20hp over the stock cone at max setting.



PM him for more info.

 

[JLEONARD]

I'd still like a comparison between Mike's pin and the DD pin.

As I said before I tried out a DD pin and it knocked my truck back several notches.

Jay

 

[PPeters]

CB, I am curious as to what proof you have to back up your statement about Mike's pin over any other one available. This is not intended as a flame, but you have a strong opinion, and I am wondering what it is about Mike's pin that makes it superior to the others. My simple understanding of the reground pin is the profile is what provides the additional power, so one cut from a billet or reground from an existing pin should not account for the performance improvement. Either the profile is correct, or it is not. Like I said, no flame intended, just curious. Feel free to correct me.



Pat

 

[sparks57]

The reason I am so confident in Mike's pin is because Mike is a friend of mine, and he is one of the frontrunners in the first gen HP race right now. He graduated from the U of Idaho (which I am currently attending) in diesel technology, and currently works at Dyno Mite Diesel over in Washington.



I like the fact that he put so much effort into designing the pin, and having it produced at a machine shop. I also like how he tested the pin over the stock cone postion, and stock cone on max position and proved on a dyno what his pin can do.



The big thing here is that he has proved what it can do, and really put the work into it.



Go to: https://www.turbodieselregister.com/user_gallery/displayalbum.php?&userid=4552&albumid=618 to take a look at it.



Don't get me wrong, I'm sure the DD and Piers pins are fine... but I would wrather go with this pin just because I have confidence in the research and craftsmanship.

 

[sparks57]

I'm currently making 27 psi with my hx-35/40 turbo, and I bet I will be making 28-29 after the pin is in, and have much better acceleration. I can tell you guys what happens when I get back monday from the BOMB party.

 

[Greenleaf]

The "stock" setting of the control cone isn't relative. The pin is not placed in the same position throughout.

Mike is doing well to make the hp he is, however, the control cone "profile" is only the "tip of the ice burg"



There are internal pump mods which can be performed to either offset or accentuate the profile of the control cone. Ask what internal mods have been performed. You'll just get a big



R&R costs $ period. The bottom line is who's R&R will you lay out the $ for. That, or simply do it yourself.



R$R is "never completed". Just ask a chemist or engineer.



-S

 

[sparks57]

Trust me, I've tried to beat it out of him. . and yeah, just a .



Oh, and we're not talking the bahama's here... . R&D maybe?



Or does R&R work too???

 

[JLEONARD]

Or does R&R work too

Going to Fl on the 19th of the month to get my R&R.



But I think Scott meant R&D is never done... I'm an engineer... I know!!



Here's my misunderstanding of the significance of the fuel pin profile... hey somebody might as well give it stab... .

We have mechanical fuel delivery systems. The fuel pin profile is intended to deliver fuel based on a certain level of air (turbo boost), and at certain rpms. The stock pin intends to balance this in the form of a specific power curve based on stock components.

The DD pin was designed several (or many) years ago based on known information at the time. It was probably a nice improvement at the time when there were few injector upgrade options, and maybe few or no turbo upgrade options.

Today, as you know there are many injector AND turbo upgrades available. So I think Old Smokey and PDR are trying to upgrade and modify the profile based on the availbility of items like modified turbogharger options, EDM injectors, 3200 rpm gov springs, etc. This will yield a different power curve. And all in an attempt to keep smoke levels down as environmentally we are in a different era today.

Also the stock fuel pin is ground eccentrically, so travel can be limited because of the thin "neck" center section. Old Smokey is more than likely made to be unidirectional so it can have more travel becuase the upper and lower sections are held together at the back edge, not near center.

With the new electronic engines a simple program box accomplishes the changed power curve... . and they are all a little different too... . they all work, but they too yield different results depending upon other mods.

Am I generally in the ballpark here?

Jay

 

[Greenleaf]

Oh, sorry. Meant R&D. I NEED R&R Been to the Bahammas. I'm thinking Muncie Oo.



-S

 

[Excessive Force]

I'm also interested in the difference between the old smoky pin,and the pdr pin. There's a big difference in price. It seems each one has a different R&R/R&D cost.....

 

[Dieselman359]

Any comments/updates on this saga?, I too am interested in this comparision.

 

[sparks57]

I installed my Old Smoky pin. Acceleration is VASTLY improved, spoolup of my turbo comes sooner, smoke is up. And I went fromt 27 psi to 30psi.



Overall good investment? HELL YES!!!!

 

[Excessive Force]

Originally posted by CB_Parker

I installed my Old Smoky pin. Acceleration is VASTLY improved, spoolup of my turbo comes sooner, smoke is up. And I went fromt 27 psi to 30psi.



Overall good investment? HELL YES!!!!

Okay CB,now try the PDR pin ,and give us a comparison.