I've never heard of anyone using a colt cam on a 7.3

 

well I did and well just picking yalls brain I have a therory but want to see if anyone else thought the same thing

 

I would lean more towards your homemade injectors with the knock thing. Your gonna need custom tuning to get it to run right. Not just some off the shelf tuner or chip. Just sayin.
It's fuel and timing related. Nothing to do with camshaft.

 

The injectors are working fine I'm pretty sure it's a timing thing see here's it when you buy performance cams their is a difference in lift duration and lobe separation and more so than not they grind advance into the cam so if their is advance or retard ground into the cam the injectors are quite possibly firing to soon or to late which would cause the fuel knock I'm here in hence why the chip made it better because it makes the injectors fire sooner or later just not sure which which is why I asked if anyone had run one. Runs to smooth for injectors to be the problem

 

Colt is a couple miles from my girlfriends house, I am going to try one in my build

 

It defiantly makes a difference and is worth the money I just have to get the tunes right with my injectors and the colt stage two new build on motor factory hoop it will walk side ways out the hole going to take to watson racing have them custom tune it on a dyno I'll post the numbers when I do

 

The cam has nothin to do with timing in a 7.3. Timing is all based off tuning. Hopefully those people know what they're doin or the rods are gonna be hangin out the side

 

That's kinda what I tried telling him. It's not like a 3406 cat or big cam 400 cummins here. There is no injector lobe on the camshaft. Inj timing is all controlled by the ECM. Your cam is not your issue, your tuning is your issue. oke:

 

I really wish i had the link for charles timming video.

 

So your saying we don't need a crank shaft sensor or timing gears all we need is tuning

 

It is nice to know any can put a cam in 180 out or not have to worry about timing marks and all we have to do is adjust the tuning

 

Do some research on "shot of injection timing" the timing marks are there so you don't have valve to piston contact but remember that lift and duration on the cam on this engine only control air into the cylinder. Fuel is controled via tuning. The crank position sensor is there so the injector knows when to fire.

 

Well I understand what lift and duration do we are talking about lobe advance and retard this effects timing so here is a senario:standard cam set straight up tdc computer fires factory at say 3 degrees before tdc ok,no after market cam say cam is 3 degrees advanced factory computor fires sooner than it normally would which could cause a timing rattle or fuel knock which ever one you want to call it so if of the self tune changes injection timing then what ever they do for a standard cam to make it perform better they would more than likely have to do more on timing for a aftermarked cam and the timing marks are in relation to the cranshaft sensor which is in relation to the cam and if that is so then the cam would and is in relation to the timing on the injectors. the reason for the cam to state that it will lower egts is that the timing on the cam is more inline with the injector fire to allow exhaust gases to leave better which also could explain the slight difference in engine tone.

 

I do know that tuning will help and after I let the guys a watson custom tune and dyno it if it doesnt do what I want Im going to purchase the minotuor system but the tuning i think i will need is so advance the timing on injectors to match the cam and when that happens the timing rattle and or fuel knock will go away I have a call into colt to find out what the advance is so I can let the tuneing pros know so they dont hang a rod out by not advancing or retarding enough to prevent running lean and detonating my New engine I posted this for Insight of some one that is running one and might have run into this before.

 

The cam lowers egt because it allows the engine to move more air. Call gear head or swamps, they do a lot with cams

 

Yup , you do that Phone colt cams. The guy actually lives 6 miles from my house. Maybe he can bring this into perspective for you better then what we are tying to make you understand. This is a little diffrent then a gasser as per camshaft results.

 

their is no program on planet earth that will run on an engine if doesnt know where the cam is at cams open and close and if they open at the wrong time they run like crap

 

the cps tells the pcm when to tell the idm when to fire the injectors but the the cam and the crank have a set position to been if one is altered it will confuse the pcm with wrong information with will make it out of time unless you can change the set position in the pcm to make it the same as the timeing on cam to the crank

 

Its ok ill figure it out thanks for your time and have a blessed day

 

And all that can be worked out via tuning

 

What stage Colt cam is it?

 

I see both ways on this. The cam can alter cylinder pressure which will affect timing. How much I do not know on a diesel. Valve overlap can effect how much air is packed into the cylinder , I do know we a force inducted so I think the change would be less then on a gas but still there.

 

Stage two

 

what are the specs of these cams? lift, valve opening and closing etc?

 

What's this crank sensor that keeps being brought up?

And i understand the logic behind the cam changing the timing, but if it is truly a fuel knock that is essentially in the tuning. Your trying to solve a simple problem with a drastic fix, which is the cam. Yes you will get a timing change but not the type of change you really need.

 

To really get the benifits of a stage2 cam usually some headwork comes into play.
There was some good info on blowbys truck and a gearhead cam iirc.

now know that blowbys truck is a 1058plus hp truck so not a real good example for the average joe...but see,ms like it also help drop about 200 egts in addition to what ever power it helped.


if i remember right.