Fordmods Logo

. 

 

Page 6 of 6 [ 84 posts ] Go to page Previous  1, 2, 3, 4, 5, 6

 
Posted: Fri Jan 09, 2009 10:44 am 
Getting Side Ways
Offline

Age: 42

Posts: 1343

Joined: 14th Dec 2007

Gallery: 1 images

Ride: EL fairmont offroader

Location: seaspray
VIC, Australia

SPARK THICKNESS & LENGTH

A small spark would ignite a small amount of gas particles, which would then ignite further gas particles, and so on. It would be a mathematical equation of exponential growth. A thicker and longer spark would ignite more particles to start with, and so on, leading to quicker ignition of the entire contents of each cylinder. A faster flame front, not through faster particle-to-particle ignition, but through faster propagation.

My thinking.

 

_________________

wrecking 9/97 EL fairmont sedan burgundy 6cyl auto 270k modBAintake

Top
 Profile  
 
 
Posted: Fri Jan 09, 2009 4:09 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 2515

Joined: 27th Mar 2006

Gallery: 1 images

Ride: FG MkII Xr6t Ute

Location: Brisbane
QLD, Australia

yeah, the flame will still propogate at the same rate though, but it will take less time as a greater volume of particles will initially be ignited by the bigger spark (ie, with a smaller spark less particles will be ignited, but the flame will still follow the same exponential equation if all the other factors are the same).

But then there's the factor of whether the flame propogation shape will be different due to the spark being longer....from which the flame will still propogate at the same rate, but the actual mass will be different due to the shape change.

 

_________________

EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

Top
 Profile  
 
 
Posted: Fri Jan 09, 2009 5:55 pm 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

skidder wrote:

But then there's the factor of whether the flame propogation shape will be different due to the spark being longer....from which the flame will still propogate at the same rate, but the actual mass will be different due to the shape change.



Exactly why people play with indexing and plug types.



About time the 6cyl section had a good technical discussion, instead all the crap that has been going on lately.

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
Posted: Sat Jan 10, 2009 10:19 pm 
Smokin em up
Offline

Age: 34

Posts: 239

Joined: 20th Jan 2007

Ride: Custom Bedford, 79 Firebird

Location: Perth
WA, Australia

we index the plugs on the race car and have found it to improve the performance of the car based on times around the track.

We later accidentally were given plugs of the same manufacturer that protruded further into the combustion chamber, which again made a rather large difference to times for us on the track.. so much so that it had a few of the other drivers quite upset..

I haven't tried the autolite plugs, but it looks like they'd be worth the test anyway, as the improvement from flush to protruding made quite a difference.

We use NGK V-Power 9s currently.. we've tested many different brands over the years but these are consistent.

But there are some good comments in here, i recommend having a play around and measuring the differences, you'd be surprised what little things combined can achieve.

 

_________________

Wrecking BA lots of parts available Pictures and prices here
3 Decks with stackers PRICE DROP

Top
 Profile  
 
 
Posted: Sat Jan 10, 2009 11:11 pm 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

MaTTeB wrote:
we index the plugs on the race car and have found it to improve the performance of the car based on times around the track.

We later accidentally were given plugs of the same manufacturer that protruded further into the combustion chamber, which again made a rather large difference to times for us on the track.. so much so that it had a few of the other drivers quite upset..

I haven't tried the autolite plugs, but it looks like they'd be worth the test anyway, as the improvement from flush to protruding made quite a difference.

We use NGK V-Power 9s currently.. we've tested many different brands over the years but these are consistent.

But there are some good comments in here, i recommend having a play around and measuring the differences, you'd be surprised what little things combined can achieve.



these autolites would be about an NGK 5 heat range. they also have a very very long projection. I wouldn't recommend you use them on a circuit racer.

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
Posted: Sun Jan 11, 2009 1:36 am 
Smokin em up
Offline

Age: 34

Posts: 239

Joined: 20th Jan 2007

Ride: Custom Bedford, 79 Firebird

Location: Perth
WA, Australia

i read before that you don't recommend them on a circuit car, but for the price its worth the effort.. we usually buy 20 plugs or so and get them as close to exact as possible when indexing.. I don't see how these are less likely to give good results, once indexed the plugs will just end up firing that bit closer to the centre of the cylinder on our head (horizontal plugs not vertical)

we clean the plugs on the car after every race as the car will foul the plugs unles it's pulling, so the warm down lap and driving through the pits make the plugs pretty black. This will burn off pretty quick, but we have the ways and means so may as well take advantage of it.

I'll look into getting some autolites sometime in the early part of the season when we have all the new regulations sorted, and get some back to back results (even if it's on a test day..)

What would the NGK V-Power 9 heat range convert to on the autolites?

Cheers, I commend you on your topical creation Tickford 6

 

_________________

Wrecking BA lots of parts available Pictures and prices here
3 Decks with stackers PRICE DROP

Top
 Profile  
 
 
Posted: Sun Jan 11, 2009 1:24 pm 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

here is the heat range chart for autolite.

 

 

Attachments:
ASP2007AutoliteHeatRange.pdf [32.18 KiB]
Downloaded 136 times

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
Posted: Mon Jan 12, 2009 11:42 am 
Getting Side Ways
Offline

Age: 42

Posts: 1343

Joined: 14th Dec 2007

Gallery: 1 images

Ride: EL fairmont offroader

Location: seaspray
VIC, Australia

What is the mechanical difference between plugs that have different heat ranges?

How can you tell if the plugs you are using have a too low or a too high heat range?

 

_________________

wrecking 9/97 EL fairmont sedan burgundy 6cyl auto 270k modBAintake

Top
 Profile  
 
 
 Post subject: Re: What JMM plugs look like from the inside.
Posted: Mon Dec 06, 2010 9:58 pm 
Getting Side Ways
Offline

Age: 34

Posts: 638

Joined: 6th Nov 2004

Ride: 1994 Ford EF Fairmont Ghia Sedan

Location: Melbourne
VIC, Australia

Sorry to bring up an old thread but MaTTeB did you manage to do the test so that we can find out the findings?

 

_________________

1994 ford fairmont ghia - Currently 302 with T5 - Work in progress :P

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 6 of 6  [ 84 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6

Who is online

Users browsing this forum: No registered users and 20 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Mon Dec 18, 2017 11:13 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names