Octane Adjust Plug

zonker · September 24th, 2010, 04:50 AM

Has anyone experimented with this little device to find out if changes in the removal or replacement of the plug with one of a different value can generate increased spark advance?

OHC230 · September 24th, 2010, 12:41 PM

Unfortunately, the octane switches used in turbo Fords are not proportional: they are either on or off. On the bright side, several companies offer dash adjustable timing controls. I use one made by MSD in my car and it was worth every penny.

zonker · September 25th, 2010, 12:37 AM

Originally Posted by OHC230

Unfortunately, the octane switches used in turbo Fords are not proportional: they are either on or off. On the bright side, several companies offer dash adjustable timing controls. I use one made by MSD in my car and it was worth every penny.

i wonder if the n/a octane plug is the same on/off characteristic, or if it has some kind of resistance value... time to get out the ohmmeter

zonker · September 29th, 2010, 09:44 PM

No resistance, so it just opens the circuit to let the ecu to make timing changes. So... does that mean removing the octane plug retards timing or advances?

If it advances, then it might be a n/a power adder.

If it retards, it might be good for the NA to turbo crowd...

looks like the timing light needs to come out for a little experimentation

Cgross609 · December 17th, 2010, 11:56 PM

Any results? My timing light is screwed so i cant even try this...

zonker · December 18th, 2010, 05:23 PM

not yet... my timing light crapped out so i found a nice adjustable one on ebay and got it last week. Its a fun new toy... it's a craftsman and it's inductive with breakaway cables and a timing adjustment knob for checking distributor advance and confirming cam timing.

my first use of it was to check to see if both coils on the 8 plug motor fire with the same initial timing.

They do.

Cgross609 · December 18th, 2010, 10:01 PM

So then what is the point of having two sparks? I mean really, unless its igniting unburnt gasses outside of the quench area, its not doing a damned thing is it? Would it be smarter to switch to a d-port head and port the hell out of it? Since the dual plugs arent really beneficiall...

zonker · December 19th, 2010, 10:28 PM

Originally Posted by Cgross609

So then what is the point of having two sparks? I mean really, unless its igniting unburnt gasses outside of the quench area, its not doing a damned thing is it? Would it be smarter to switch to a d-port head and port the hell out of it? Since the dual plugs arent really beneficiall...

all i have a guess...

ford needed the extra spark help to meet the federal emissions warranty period (if the cars can't run clean for over 50k miles then they fail the tests)

free2.3 · December 20th, 2010, 06:30 AM

it also completely burns the fuel having 2 flame fronts instead of 1. because normally the quench area disrupts the flame front causing poor combustion. thats why you want to run a flat top piston with small open chambers(keep compression) witch promotes the best scavenging, swirl, and burn(it is what top fuelers run). the only down fall to that is you have to have valve reliefs in the piston and you also just created an interference motor. but fords brilliant engineers just decided to throw another plug in there(European crap alphas are famous for twin plugs hence the gay spark plug wires) instead of redesigning the head and pistons to meet emissions.

zonker · December 20th, 2010, 11:19 PM

that and henry ford's cousin was the spark plug salesman selling the idea to management lol

Cgross609 · December 21st, 2010, 01:48 AM

Originally Posted by zonker

that and henry ford's cousin was the spark plug salesman selling the idea to management lol

AHAHA classic

September 24th, 2010, 04:50 AM	#1
zonker Enthusiast 1991 Mustang LX 2.3 Join Date: Sep 2010 Location: Temecula, CA Posts: 660 iTrader: 0 reviews	Octane Adjust Plug Has anyone experimented with this little device to find out if changes in the removal or replacement of the plug with one of a different value can generate increased spark advance? __________________ Rob 1987 Mustang 2.3 LX Convert (T5) project 2.5 N/A HP 1991 Mustang 2.3 LX Convert (A4LD) 1992 Mustang 2.3 LX Convert (A4LD) 41.52 mpg!! 1994 Capri XR2 1.6 Turbo Convert 1999 ZX2 S/R 2.0 Coupe http://zxtuner.com

September 24th, 2010, 12:41 PM	#2
OHC230 Enthusiast Supercharged 89'/ 85' SVO 11.945 @ 119.6 Join Date: Jan 2010 Location: Napa Valley CA Posts: 879 iTrader: 0 reviews	Unfortunately, the octane switches used in turbo Fords are not proportional: they are either on or off. On the bright side, several companies offer dash adjustable timing controls. I use one made by MSD in my car and it was worth every penny. __________________ Supercharged 2.7L 398 HP 501 ft lb !!

September 29th, 2010, 09:44 PM	#4
zonker Enthusiast 1991 Mustang LX 2.3 Join Date: Sep 2010 Location: Temecula, CA Posts: 660 iTrader: 0 reviews	No resistance, so it just opens the circuit to let the ecu to make timing changes. So... does that mean removing the octane plug retards timing or advances? If it advances, then it might be a n/a power adder. If it retards, it might be good for the NA to turbo crowd... looks like the timing light needs to come out for a little experimentation __________________ Rob 1987 Mustang 2.3 LX Convert (T5) project 2.5 N/A HP 1991 Mustang 2.3 LX Convert (A4LD) 1992 Mustang 2.3 LX Convert (A4LD) 41.52 mpg!! 1994 Capri XR2 1.6 Turbo Convert 1999 ZX2 S/R 2.0 Coupe http://zxtuner.com

December 17th, 2010, 11:56 PM	#5
Cgross609 Regular 93 Mustang LX 2.3 T-5 Join Date: Sep 2010 Location: Vegreville, AB Posts: 270 iTrader: 0 reviews	Any results? My timing light is screwed so i cant even try this... __________________ 93 2.3l LX U.S. 15x7 ten hole rims Calypso green Moates QH T-5 Conversion Dual 2.5" Exhaust with Thrush Welded muffler

December 18th, 2010, 05:23 PM	#6
zonker Enthusiast 1991 Mustang LX 2.3 Join Date: Sep 2010 Location: Temecula, CA Posts: 660 iTrader: 0 reviews	not yet... my timing light crapped out so i found a nice adjustable one on ebay and got it last week. Its a fun new toy... it's a craftsman and it's inductive with breakaway cables and a timing adjustment knob for checking distributor advance and confirming cam timing. my first use of it was to check to see if both coils on the 8 plug motor fire with the same initial timing. They do. __________________ Rob 1987 Mustang 2.3 LX Convert (T5) project 2.5 N/A HP 1991 Mustang 2.3 LX Convert (A4LD) 1992 Mustang 2.3 LX Convert (A4LD) 41.52 mpg!! 1994 Capri XR2 1.6 Turbo Convert 1999 ZX2 S/R 2.0 Coupe http://zxtuner.com

December 18th, 2010, 10:01 PM	#7
Cgross609 Regular 93 Mustang LX 2.3 T-5 Join Date: Sep 2010 Location: Vegreville, AB Posts: 270 iTrader: 0 reviews	So then what is the point of having two sparks? I mean really, unless its igniting unburnt gasses outside of the quench area, its not doing a damned thing is it? Would it be smarter to switch to a d-port head and port the hell out of it? Since the dual plugs arent really beneficiall... __________________ 93 2.3l LX U.S. 15x7 ten hole rims Calypso green Moates QH T-5 Conversion Dual 2.5" Exhaust with Thrush Welded muffler

December 20th, 2010, 06:30 AM	#9
free2.3 Regular FK UR HONDA Join Date: Jun 2010 Location: the glory hole Posts: 366 iTrader: 0 reviews	it also completely burns the fuel having 2 flame fronts instead of 1. because normally the quench area disrupts the flame front causing poor combustion. thats why you want to run a flat top piston with small open chambers(keep compression) witch promotes the best scavenging, swirl, and burn(it is what top fuelers run). the only down fall to that is you have to have valve reliefs in the piston and you also just created an interference motor. but fords brilliant engineers just decided to throw another plug in there(European crap alphas are famous for twin plugs hence the gay spark plug wires) instead of redesigning the head and pistons to meet emissions.

December 20th, 2010, 11:19 PM	#10
zonker Enthusiast 1991 Mustang LX 2.3 Join Date: Sep 2010 Location: Temecula, CA Posts: 660 iTrader: 0 reviews	that and henry ford's cousin was the spark plug salesman selling the idea to management lol __________________ Rob 1987 Mustang 2.3 LX Convert (T5) project 2.5 N/A HP 1991 Mustang 2.3 LX Convert (A4LD) 1992 Mustang 2.3 LX Convert (A4LD) 41.52 mpg!! 1994 Capri XR2 1.6 Turbo Convert 1999 ZX2 S/R 2.0 Coupe http://zxtuner.com

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