| Author |
Message |
Gerrit Visser (Gerritv)
Junior Member
Username: Gerritv
Post Number: 58
Registered: 6-2001
| | Posted on Saturday, May 04, 2002 - 9:38 am: | |
Peter
I am going by what I have heard. Crane doesn't include much information about their units. If you haven't had problems, then I wouldn't worry. I am treating the xtalk between modules the same way. The occasional misfire won't be noticed, esp. relative to the points I had :-)
Regarding xtalk between the units, I am mounting them with some distnace between them and keeping the wiring separated. This is good practice regadless of the hearsay, etc.
The units are in, timed and ready for a test drive today. While cleaning up the advance mechanisms, I did find 1 spring that was too short to touch the housing until high RPM. Over the winter (the next one) I will be comparing the advance curves. |
Edward Gault (Irfgt)
Intermediate Member
Username: Irfgt
Post Number: 1303
Registered: 2-2001
| | Posted on Saturday, May 04, 2002 - 8:30 am: | |
Silicone jacket with carbon core. I purchase the stuff in a bulk roll and construct my own wires. |
Bill Sebestyen (Bill308)
Junior Member
Username: Bill308
Post Number: 214
Registered: 5-2001
| | Posted on Saturday, May 04, 2002 - 7:48 am: | |
Ed,
What's the construction of the 8mm Belden wire you use for your EM system?
Stranded copper, spiral wound, carbon core, or other? |
Craig Dewey (Craigfl)
Member
Username: Craigfl
Post Number: 372
Registered: 1-2001
| | Posted on Saturday, May 04, 2002 - 6:44 am: | |
I wonder if we are talking about two different things here... "crossfire" and "crosstalk".
Crossfire to me means spark jumping from one wire to another that is in close proximity.
Crosstalk to me means that the high voltage ignition modules are putting out an electro-magnetic interference that could confuse the operation of the other ignition unit causing things like misfiring, wrong timing or even an induced "crossfire" to another cylinder at the wrong time.
I suspect that the design of these modules may not include the use of two units in close proximity since most vehicles would only need one unit. If two units are used, simple EMI(electro-magnetic interference)shielding and routing techniques may take care of the problem. |
'75 308 GT4 (Peter)
Intermediate Member
Username: Peter
Post Number: 1829
Registered: 12-2000
| | Posted on Saturday, May 04, 2002 - 3:44 am: | |
Gerrit, this is the first time I hear of this warning of not to leave ignition on, without running the engine, with XR700's. Its not written anywhere in the manual....
This info would be very important to me.... |
Paul Sloan (Sloan83qv)
Member
Username: Sloan83qv
Post Number: 322
Registered: 3-2001
| | Posted on Friday, May 03, 2002 - 10:41 pm: | |
God, I hope I haven't kill Edward. This kind of shock could be deadly. :-) |
Paul Sloan (Sloan83qv)
Member
Username: Sloan83qv
Post Number: 321
Registered: 3-2001
| | Posted on Friday, May 03, 2002 - 10:37 pm: | |
To Date I have installed 6 Electromotive systems on 308's (all variations)and would have to agree with Ed (A 1st for everything Ed).
Ignition wires are so much better today that crossfire is not a concern. |
Edward Gault (Irfgt)
Intermediate Member
Username: Irfgt
Post Number: 1294
Registered: 2-2001
| | Posted on Friday, May 03, 2002 - 7:29 pm: | |
Bill, I have routed the wires with my Electromotive through the original round tabs that the factory had them in and my car runs great. I am using 8mm Belden wire. I have never in my career ever witnessed the phenomenon of crossfire. I have heard of it but never have seen it and I have seen a bunch of cars. Around 35,000 at last count. |
Bill Sebestyen (Bill308)
Junior Member
Username: Bill308
Post Number: 211
Registered: 5-2001
| | Posted on Friday, May 03, 2002 - 6:21 pm: | |
I'm sure that Ed G. would disagree with me here, but I prefer to keep plug wires separeated to aviod the possiblility of cross firing, induced spark from and adjacent wire. The stock wiring looms ensure convergance of all wires. This may be OK for a stock ignition, but for the higher voltages produced by some of the aftermarket systems, I'd want to separate them. I installed an Electromotive HPV-1 system that produces one spark per crankshaft per revoulution. The extra spark does no harm, so I feel comfortable routing those wires that fire at the same time together. This method keeps the spark plug wires compact but ensures no cross firing. |
Steve (Steve)
Junior Member
Username: Steve
Post Number: 149
Registered: 2-2001
| | Posted on Friday, May 03, 2002 - 4:18 pm: | |
I still like my Pertronix's set up. Neat and clean. |
Greg Rodgers (Joechristmas)
Member
Username: Joechristmas
Post Number: 267
Registered: 3-2001
| | Posted on Friday, May 03, 2002 - 10:34 am: | |
Ok I just wanted to let you know. |
Gerrit Visser (Gerritv)
Junior Member
Username: Gerritv
Post Number: 57
Registered: 6-2001
| | Posted on Friday, May 03, 2002 - 10:05 am: | |
Hi Greg
Yes, I have heard about the xtalk as well. However we know of several successful installations in the area. I will be dressing the wires separately (close to original routing) as well as separating the modules as best I can.
The XR700's have a different problem, you shouldn't leave the ignition on without the engine running. Sounds like a darned if you do, darned if you don't. Even if there is the occasional cross talk on the 3000's, it will remind me of the joy of points where misfires are happening all too regularly. |
Greg Rodgers (Joechristmas)
Member
Username: Joechristmas
Post Number: 266
Registered: 3-2001
| | Posted on Friday, May 03, 2002 - 9:37 am: | |
I am not sure about the two XR3000s. Why not the XR700s. I know the XR3000s are more powerful but when I talked to Crane about them they recommended to only use the XR700s if you need two units as the XR3000s will have a tendency to Cross talk. I just thought I would include this. Maybe Crane has remedied the problem now. |
Gerrit Visser (Gerritv)
Junior Member
Username: Gerritv
Post Number: 56
Registered: 6-2001
| | Posted on Friday, May 03, 2002 - 9:09 am: | |
Hi Greg,
No, two XR3000's. One for each distributor.
Craig, thanks. I read all the posts in the archives. Lots of useful stuff. Perhaps I am having a senior moment about seeing that picture :-) |
Greg Rodgers (Joechristmas)
Member
Username: Joechristmas
Post Number: 264
Registered: 3-2001
| | Posted on Friday, May 03, 2002 - 6:38 am: | |
You will only be using one XR3000 correct? |
Craig Dewey (Craigfl)
Member
Username: Craigfl
Post Number: 371
Registered: 1-2001
| | Posted on Friday, May 03, 2002 - 6:31 am: | |
The crank pulley nut is 36mm.
I was unable to find a picture of the timing marks when I was replacing my belts recently. I did start another thread then and the conclusion seemed to be that different flywheels had different marks. My 328 euro flywheel had PM|14 mark with TDC bar in between the "M" and the "1". |
Gerrit Visser (Gerritv)
Junior Member
Username: Gerritv
Post Number: 55
Registered: 6-2001
| | Posted on Thursday, May 02, 2002 - 10:14 pm: | |
Hi,
I am installing XR3000's this week. Two questions:
1. What size is the crank pulley nut? I need to buy a socket.
2. I seem to recall that someone took photos of the timing marks on a flywheel. Search FC and FL archives didn't get me to a photo. Does anyone have the URL?
I'll be cleaning up the flywheel edge with a steel brush but want to be sure what I am looking for. Once cleaned, will use some white or yellow paint to make the marks more visible. My mechanic has already marked the running marks on the clutch housing, still need to find the static 16 degree marks and TDC (PM14 and PM58).
(this is for a Euro 1976 308GT4)
TIA |