Mark, every time someone took the 14mm up to 4k, it would seize.

 

That's because of the 4mm camplate being run with the 14mm head. If you stick with the stock 2.8 or 3.2 camplate with the 14mm head, they seem to hold up ok.

 

I've had my 14mm up to about 3,500 rpm and it still fuels...luckily if it runs away I know the 14mm will seize up and save the engine LOL.

 

im doing it but i still have to find an air shut down and order springs and studs

 

If you guys are serious about a positive air shutoff, I have installed a couple. They are a requirement on diesel trucks used in the oil patch, as there can be fumes in the air that the engine can inhale and run on. They are made by a company called Roda Deaco, and are not cheap, but it sounds like what you are looking for.
www.rodadeaco.com

Also, I have also just found one sold by BD Diesel, who is a vendor here. Here's a link to their page: http://www.dieselperformance.com/ind...uct/index/187P

 

Wow, I think I could make one much cheaper

 

Engineered Diesel makes them. I'd buy from them if I were to run one. They aren't cheap but you're paying for precision and the peace of mind knowing it will work when you need it most. IMO of course.

 

The fuel doesn't necessarily roll-off sharply after 3500 (clipped 3200rpm spring) .. . .







The ED air shut-off is a nice unit . . .



Notice the high-tech activation mechanism

 

Well I got it put in yesterday, I had the time to do it so tore into my pump and put it in. I also fixed my fuel leak while I had the top off that has been leaking for 2 years (throttle shaft O-ring). It was kind of a pain to get that tight 4200 spring hooked back up to the top hat but I got it. Went to fire it up and it wouldn't run unless I gave it some throttle, it was idling way too low and would die, so i re indexed my throttle and now it runs great. Throttle is way touchy and snappy but I like it. You barely touch it and your already at 2000 rpm. I wanna put this 5000 back on and see how well it spools now because it gets up much quicker. Seems to have a little more pull on top end, but I need to get better lift pump in, 60 lb springs and studs til i really open er up.

Oh and it didn't runaway, it does the same thing as before, as soon as it hits about 1200 rpm in neutral it just takes off on its own til i let off. I put a plastic bag over my filter before I did all this to see if it would kill it in case it ran away... BAD idea! it worked and killed it, but it scrunched up my filter and my rubber elbow that connects to the turbo and that was just idling! So i bent my filter back out, but it has a nice wrinkle in it now, I recommend just using a board.

 

Talk to Pwrtrip. He has a 4200 spring on a 12mm head. He swears by it.

It ain't just noise if it's still pulling under load. If it's dropping off that's another story. The dyno graph will tell all

 

I'd say if your running a big single and wanna get it spooled quick, then the 4200 spring is the way to go! I think it pulls just as hard or harder than the 3200, but it gets up much much quicker. I got a tach so I can keep er safe

 

Be careful running up near and above 3600rpm until you get 60lbs or higher springs.

 

Yeah I know, those are coming soon along with studs, gonna do them both at once. But I haven't even gotten it over 3000 yet with this spring, I've been driving it real nice the last few months.

 

I like mine and yes because the spring is a little longer you do have to index one click further.
I also had fun getting that spring on the top hat the diameter of the spring material is larger..

 

Okay that makes sense. Yeah it was kind of a pain there for while to get it all hooked up, since it is bigger diameter and a much tighter spring. But I got it in and I am satisfied