Project 3400 Roller Cam Block (Page 18/82)
lou_dias JAN 11, 01:08 PM

quote
Originally posted by Joseph Upson:


Be sure you buy a quality part here as cheap crank sensors are about like cheap ignition modules.



Duralast one is $17.99 @ Autozone.
Joseph Upson JAN 11, 02:03 PM

quote
Originally posted by lou_dias:
Duralast one is $17.99 @ Autozone.



Don't do it, I nearly quit on my 3900 swap after repeated intermittent no starts that were hard to track down until the culprit (CPS) failed completely. Don't gamble on parts that can take you down for the count. You can but I wouldn't.
lou_dias JAN 11, 02:36 PM
Do you have a better part to point me at?

Right now I'm using the factory part which is intermittent. How is this a step down? For $18, it's worth a try. The Autozone p/n is SU137.
Joseph Upson JAN 11, 06:09 PM

quote
Originally posted by lou_dias:

Do you have a better part to point me at?

Right now I'm using the factory part which is intermittent. How is this a step down? For $18, it's worth a try. The Autozone p/n is SU137.



Whatever floats your boat is all that matters. I'm opposed to autozone modules particularly and other ignition parts from personal experience only, not hearsay. NAPA, Carquest or GM are my options and if that's not in my budget an ebay NOS or low mileage used OE. That's the kind of lesson I learned from Autozone ignition parts.

[This message has been edited by Joseph Upson (edited 01-11-2011).]

lou_dias FEB 03, 09:52 PM
Holy crap!

I've been having coughing issues/misfires with the engine lately.
Lowered the gap on the plugs to .055 and replaced the wires ...
...
...
...
...
now it feels faster than my 97 vette!!!

I need a dyno STAT!
JamesCurtis FEB 03, 11:20 PM
Lowered to .055 ---- what was it at before?
lou_dias FEB 04, 08:54 AM

quote
Originally posted by JamesCurtis:

Lowered to .055 ---- what was it at before?



Well, the DIS using a '7730 swap dictates a .060 gap. I am running higher compression due to the 3.4DOHC pistions so it needed a smaller gap.

[This message has been edited by lou_dias (edited 02-04-2011).]

lou_dias FEB 15, 07:45 AM
I seem to be getting carbon build-up on the plug on Cyl #5.
Ran great for 2 day before the build up started causing misses...
I guess I need a compression test...

Darth's got the F40+'7730 working with the speedo. The value he plugged in has it reading like it's on an 85mph speedo. When I'm going 70 it reads 105. We'll try a new value soon enough.
Joseph Upson FEB 15, 08:04 AM

quote
Originally posted by lou_dias:
Well, the DIS using a '7730 swap dictates a .060 gap. I am running higher compression due to the 3.4DOHC pistions so it needed a smaller gap.



I doubt DIS ignition dictates what the spark plug gap should be more than the engine combination itself. Since the 3.4L is the only DIS iron head 60 degree motor GM produced you should gap the plugs according to its plug gap specs. .060 on an aluminum head motor is fine because it doesn't take as much ignition timing to light off the combustion mix due to their fast burn design and they were gapped to that spec from the factory. On the other hand, iron heads call for much more timing and you probably complicated that process with increased compression and increased spark plug gap possibly and very likely the cause of the carbon build up in one cylinder, insufficient combustion due to inadequate spark energy.

Change your plug gap to something more practical for iron heads and see what happens.

[This message has been edited by Joseph Upson (edited 02-15-2011).]

lou_dias FEB 15, 08:54 AM

quote
Originally posted by Joseph Upson:


I doubt DIS ignition dictates what the spark plug gap should be more than the engine combination itself. Since the 3.4L is the only DIS iron head 60 degree motor GM produced you should gap the plugs according to its plug gap specs. .060 on an aluminum head motor is fine because it doesn't take as much ignition timing to light off the combustion mix due to their fast burn design and they were gapped to that spec from the factory. On the other hand, iron heads call for much more timing and you probably complicated that process with increased compression and increased spark plug gap possibly and very likely the cause of the carbon build up in one cylinder, insufficient combustion due to inadequate spark energy.

Change your plug gap to something more practical for iron heads and see what happens.



Well even when the mechanic put in the plug off the shelf and I later checked the gap (.035), #5 was the only one with carbon. I don't think it's a gap issue on that one...