2004 mcx 350 cam specs????

[flipper]

Yeah, what could happen?

That's gotta hurt

[CantRepeat]

Hey guys,
I know I am going to need to adjust the fuel mapping for the 383. I was debating on sending my ecm in to get it mapped or purchasing the MEFI Burn software and tuning the computer myself via laptop in the boat using the real time engine data. The program is a little pricy but Will prob be worth it in the long run, having theability to make adjustments any time I want.
My only concern is if the stock injectors will be able to handle the amount of fuel needed.
Thank you
Scott

The stock injectors will not flow enough fuel. You will not know how much to change things. Just pay someone qualified to do the work. Your motor is worth to much to just guess. As you can see by the previous discussions it's not a seat of hte pants feel.

I'll look more at the other photos in a second and post about them.

[CantRepeat]

Yeah, what could happen?

As someone else said a bad chip burn could be fast feedback, bend a valve or something that would let you know it was screwed up.

One of the long term issues I know about comes from watching others. Said motorhead put a HP310 HP small block in a standard 350/210 HP fuel system. It ran "fine" for a long time until the tops of pistons finally burned off.

The same thing happens with 383s that run 350 injectors.

We know you don't have a dyno. So when I ask who could burn a chip I wasn't talking about the average joe with a computer in his garage. I was talking about someone that burns chips professionally. You could try www.tbichips.com and see if he can do it or knows someone that can do it.

[JimN]

Ah the old superflow...I do miss it from time to time.

If it were me...and it's not...I call Alan Tehan (http://www.technicalservicesin.com/index.php) since he has done more MC "hotrodding" than most. He used to be on the MC payroll, but that is another story for a different day.

The photo of the engine on the dyno- I copied it from his site and that is where I'd go. I really liked hanging out down there during training.

[JimN]

The stock injectors will not flow enough fuel. You will not know how much to change things. Just pay someone qualified to do the work. Your motor is worth to much to just guess. As you can see by the previous discussions it's not a seat of hte pants feel.

I'll look more at the other photos in a second and post about them.

Why won't they? Without knowing how much it needs, I don't think there's any reason to automatically decide they can't do the job when the easiest change to make is the pulse width. (This motor doesn't have a blower, does it? If it will get one, it'll need a different MAP sensor, too.)

[MYMC]

Why won't they? Without knowing how much it needs, I don't think there's any reason to automatically decide they can't do the job when the easiest change to make is the pulse width. (This motor doesn't have a blower, does it? If it will get one, it'll need a different MAP sensor, too.)

Jim,
You really dont want the duty cycle to be greater than 80% so the 24lbs injector may not be enough based on "guesstimated" HP. The other side of this is that the larger injector is much more difficult to control at idle...particularly given the set-up.

You could boost fuel pressure to make the 24lbs injector act bigger, but then you are getting into modified fuel systems on a boat...never a good thing.

Decisions decisions...

[JimN]

Jim,
You really dont want the duty cycle to be greater than 80% so the 24lbs injector may not be enough based on "guesstimated" HP. The other side of this is that the larger injector is much more difficult to control at idle...particularly given the set-up.

You could boost fuel pressure to make the 24lbs injector act bigger, but then you are getting into modified fuel systems on a boat...never a good thing.

Decisions decisions...

That was more or less my point. I don't know exactly what the duty cycle is with the OEM program. As I said, there's no reason to just decide that they can't handle it out of hand and guessing isn't much good for this kind of situation.

[CantRepeat]

Why won't they? Without knowing how much it needs, I don't think there's any reason to automatically decide they can't do the job when the easiest change to make is the pulse width. (This motor doesn't have a blower, does it? If it will get one, it'll need a different MAP sensor, too.)

All the reading I've done says the stock 350 injectors will run a 383 lean. All of the aftermarket engine builders that I've talk to say to run the 454s because it will run lean. I assume they know what they are talking about.

[CantRepeat]

That was more or less my point. I don't know exactly what the duty cycle is with the OEM program. As I said, there's no reason to just decide that they can't handle it out of hand and guessing isn't much good for this kind of situation.

Yes, there is a reason. The fact that so many aftermarket builders say so.

[CantRepeat]

Yeah, what could happen?

So, Dummy, what is the story behind this piston?

[MYMC]

So, Dummy, what is the story behind this piston?

My guess looking at the picture is that the top ring did this.

[scottyb]

Well its going in this weekend

[dummy]

So, Dummy, what is the story behind this piston?

LS sand car engine. Twin turbo, lotsa boost, not enough C16 in the mix. Guy ignored the detonation 'till this happened. My buddy did the exact same thing with a 6.0L and a supercharger. Gotta feed 'em enough fuel and make sure the timing is pulled under boost or this is the result.

[scottyb]

do you guys know when setting the timing on the electronic ignition dist. in the mcx, if there is anything I need to jump or disconnect?