Author Topic: 1998 FXDWG Ignition system  (Read 376 times)

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Offline dubepj

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1998 FXDWG Ignition system
« on: December 11, 2017, 07:19:22 AM »
just got this bike and did not ride it yet.  Too cold in Alberta Canada.  It has lots of aftermarket that the PO put on there.  One item is a HI-4E Fireball ignition system.  Also has a Single fire coil 8-3005.  Bike seems to run fine but I don't really see the advantage of this ignition system over the stock one.  I don't ever plan to rev the bike over 5000 RPM and just want to ride on the highway and never intend to race.  Thinking of finding a stock ignition module (32449-95A) and stock coil (31614-83A) and putting back to original.  I trust the OEM stuff more. Do i  need other stuff to put back to original??
Ignition is now set to run as a single fire set up.  Is there any real advantage to this.  Have had many EVO Harleys before with stock ignition and they ran good.
Your thoughts please. 

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Re: 1998 FXDWG Ignition system
« Reply #1 on: December 11, 2017, 10:44:02 AM »
If it runs well, I would not change it. Seems like looking for a solution to a problem that isn't there.
I can't tell you if that ignition is prone to problems, but if not, why not leave it.
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Offline 1FSTRK

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Re: 1998 FXDWG Ignition system
« Reply #2 on: December 11, 2017, 01:11:29 PM »
Single fire will run a little smoother and get better fuel mileage in most engine combinations.
Single fire is stock on all Twin cams and if it were my bike I would leave it on and enjoy the ride.
"Never hang on to a mistake just because you spent time or money making it."

Offline FSG

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Re: 1998 FXDWG Ignition system
« Reply #3 on: December 11, 2017, 01:38:33 PM »
 :agree:

besides finding a stock ignition module (32449-95A) and stock coil (31614-83A) is going to cost you big $$$$$

you may find the items on eBay but they will be used so are you going to trust them?


32449-95C   IGNITION MODULE   MRRP   $262

31614-83A   SPARK COIL, 12 VOLT   MRRP   $61

Offline thumper 823

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Re: 1998 FXDWG Ignition system
« Reply #4 on: December 11, 2017, 01:50:37 PM »
Stock parts work for stock bikes.
When one part of them fails, most people will buy  aftermarket
to replace it because they work better and are cheaper than the original crap.
D Troop 3/5, - C/16 ,162AHC, Mekong delta.
Amateur engineering with bad math.

Offline dubepj

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Re: 1998 FXDWG Ignition system
« Reply #5 on: December 23, 2017, 12:03:39 PM »
Another question for you EVO experts. I'll list all the aftermarket options I have on this bike and you experts try to tell me about how much HP it should generate.
HI-4E Fireball ignition system with single fire coil 8-3005
Andrews EV-27 Cam
Thunderheader Exhaust
Arlen Ness air cleaner
HSR42 Muikuni Carb
I believe the rest is stock
It should go pretty good I think.



Offline thumper 823

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Re: 1998 FXDWG Ignition system
« Reply #6 on: December 23, 2017, 12:31:53 PM »
Most Any cam will give a bump.
To archive  better results one has to bump the CR up a couple points
Thunder headers flow well
Most AIR FILTERS are oversold and overrated, do not mean much until your rpm IS IN THE OZONE.
I am going o give you 70 HP and a nice TQ line with that cam and stock CR
D Troop 3/5, - C/16 ,162AHC, Mekong delta.
Amateur engineering with bad math.

Offline Breeze

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Re: 1998 FXDWG Ignition system
« Reply #7 on: December 23, 2017, 02:09:50 PM »
I'm also gonna go with 70 hp. for that combo.
I'm starting to believe my body is gonna outlast my mind.

Offline K4FXD

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Re: 1998 FXDWG Ignition system
« Reply #8 on: December 23, 2017, 05:34:50 PM »
Night rider shows 68 HP stage 2 with EV-27

Looks like it needs a bump in comp. Maybe the guy who installed the cam also upped the compression ratio.

http://www.nightrider.com/biketech/hdeds2h0680.htm
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Offline thumper 823

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Re: 1998 FXDWG Ignition system
« Reply #9 on: December 23, 2017, 05:49:38 PM »
Smarter people them me know about pies are sq.
A 4-inch bore will yield about 800 lbs @ 8.5 to 1
Now don't get sidetracked by the bore size
Under Sq/ vs over sq
and a host or volumes of methods will offer different results
The only way to get more pressure on the piston is up the VE  somehow.
Everything helps but when you jump a couple points in the CR dept its leaps and bounds.

read this
https://en.wikipedia.org/wiki/Compression_ratio
D Troop 3/5, - C/16 ,162AHC, Mekong delta.
Amateur engineering with bad math.

Offline K4FXD

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Re: 1998 FXDWG Ignition system
« Reply #10 on: December 23, 2017, 06:29:02 PM »
I'm just going off the intake close spec and the torque curve that they posted.

Looks to me like it could use a bump.
I prefer dangerous freedom to peaceful slavery

Online Burnout

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Re: 1998 FXDWG Ignition system
« Reply #11 on: December 28, 2017, 07:06:22 AM »
A single fire ignition allows twice the time for the coil to dwell and saturate the magnetic field which makes for a hotter spark.
It also allows you to adjust for manufacturing tolerance shift and get both cylinders timed to a RCH of each other.

Most will not be able to detect any difference between single and dual fire systems.

I collect and reuse the stock ignitions cast aside by folks who replace them.  :smiled:
They don't call me Ironhead Rick just because I'm "hard headed"

Offline JW113

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Re: 1998 FXDWG Ignition system
« Reply #12 on: December 28, 2017, 12:02:19 PM »
With those parts and just bolted on, 70HP give or take is pretty close. A little head work and another point of CR, then I'd say looking more like 75HP.

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