spark plug gapping
#2
Turbocharging Technician
Joined: Jul 2010
Posts: 3,557
Likes: 0
From: Top secret. Mission:Imposible.
not only stronger, but the right temperature and will also help with missfires, and various other running problems, ive even seen ecus reset due to interference from plugs with too big a gap.
#3
During normal operation the spark plug gap would tend to increase due to erosion of the electrode, and with the wider the gap the harder it is to spark across it, but with a narrower gap the faster the plug will wear.
All you need is a enough spark to start the fuel burning.
I would leave the gap as it should be
All you need is a enough spark to start the fuel burning.
I would leave the gap as it should be
#4
Turbocharging Technician
Joined: Jul 2010
Posts: 3,557
Likes: 0
From: Top secret. Mission:Imposible.
New plugs should NEVER just be thrown in, ALWAYS check the gaps and set them as they are different for many applications. Plus if the plugs have been dropped at any point they may ahve pinched the gap up. You wouldnt put any old grade of engine oil in, just because its wet and slippery, plugs are no different
#6
Turbocharging Technician
Joined: Jul 2010
Posts: 3,557
Likes: 0
From: Top secret. Mission:Imposible.
Urg not off the top of my head, most gaps should be between .6 and a millimeter. .6 is always a safe bet, but im sure a quick google will tell you the exact size mate
Trending Topics
#8
Turbocharging Technician
Joined: Jul 2010
Posts: 3,557
Likes: 0
From: Top secret. Mission:Imposible.
Not sure an electrical spark can be blown out! but certainly zetecs use resistor plugs and not conventional ones for sure. What actualy happens is that when boost rises, the air/fuel mix gets denser and it is now harder for the spark to jump the gap. if it is too big then it just wont spark, and you will get a miss fire.
Last edited by chaffe; 22-09-2010 at 01:05 PM.
#9
The term blown out means it doesn't spark for whatever reason, usually too high a pressure, remember turbo cars have TWO compression ratios not one, the latter CR is the adiabatic CR, that is when under boost, it then needs more energy to jump the same gap as it would without boost.
I don't know about this crap about using "resistor plugs and not conventional", all plugs in any ecu equipped car should be resistor, in fact I can't think of a single engine these days that isn't resistor plugs, emi can knock out ecu's, one of the reasons they are used.
In short just experiment with the gap so long as it sparks under all conditions it is fine.
tabetha
I don't know about this crap about using "resistor plugs and not conventional", all plugs in any ecu equipped car should be resistor, in fact I can't think of a single engine these days that isn't resistor plugs, emi can knock out ecu's, one of the reasons they are used.
In short just experiment with the gap so long as it sparks under all conditions it is fine.
tabetha
#11
standard gap on the focus rs plugs i had was 1.2 zetec plugs r 1.0 the gap ive found to work best is 0.7 on the focus rs plugs on my setup part of my problem was the actuator was wound most of the way in so way to much boost so ive wound it pretty much all the way out so theres basically no boost but it drives like a non turbo'd car so wen i get a boost gauge tomoroo ill set it up to about 5-6 psi until i get my emerald ecu fitted next week an get it all setup an mapped properly
#13
Turbocharging Technician
Joined: Jul 2010
Posts: 3,557
Likes: 0
From: Top secret. Mission:Imposible.
The term blown out means it doesn't spark for whatever reason, usually too high a pressure, remember turbo cars have TWO compression ratios not one, the latter CR is the adiabatic CR, that is when under boost, it then needs more energy to jump the same gap as it would without boost.
I don't know about this crap about using "resistor plugs and not conventional", all plugs in any ecu equipped car should be resistor, in fact I can't think of a single engine these days that isn't resistor plugs, emi can knock out ecu's, one of the reasons they are used.
In short just experiment with the gap so long as it sparks under all conditions it is fine.
tabetha
I don't know about this crap about using "resistor plugs and not conventional", all plugs in any ecu equipped car should be resistor, in fact I can't think of a single engine these days that isn't resistor plugs, emi can knock out ecu's, one of the reasons they are used.
In short just experiment with the gap so long as it sparks under all conditions it is fine.
tabetha
#14
No normal cars SUCK literally, atmospheric pressure is the only thing trying to get in, ie 14.5038PSI, or 1 BAR, so they can only ever fill to a certain point dependant on their CC as this denotes the SUCTION, mechanical design then gives the CR.
When air is being forced in by a massive great air pump, or TURBO as most call them more than NATURAL suction occurs to the point of being FORCE fed this is why the same engine size with a turbo makes more power, more air is forced in the same space, along with more fuel injected, this is called a adiabatic compression ratio, if you don't believe it simply read what Geoff Kershaw writes, oh by the way doh!!
Your info was called CRAP about resistor plugs as it is well crap doh!!
Try reading a bit more instead of listening down the pub doh!!, obvious really where do you think other people learn.
I've used accidentally non resistor plugs in cars one knocked out the abs function, a good book to read is by Dave Walker all about engine management, haynes book number H835, the other about turbos and superchargers is book no 9880.
When you've read H835 you can then quote me chapter and verse to show me how wrong I am, go on you know you want to.
tabetha
When air is being forced in by a massive great air pump, or TURBO as most call them more than NATURAL suction occurs to the point of being FORCE fed this is why the same engine size with a turbo makes more power, more air is forced in the same space, along with more fuel injected, this is called a adiabatic compression ratio, if you don't believe it simply read what Geoff Kershaw writes, oh by the way doh!!
Your info was called CRAP about resistor plugs as it is well crap doh!!
Try reading a bit more instead of listening down the pub doh!!, obvious really where do you think other people learn.
I've used accidentally non resistor plugs in cars one knocked out the abs function, a good book to read is by Dave Walker all about engine management, haynes book number H835, the other about turbos and superchargers is book no 9880.
When you've read H835 you can then quote me chapter and verse to show me how wrong I am, go on you know you want to.
tabetha
Thread
Thread Starter
Forum
Replies
Last Post
deathrider666
Technical help Q & A
3
28-09-2015 06:12 PM