Fordmods Logo

Re-graph my dizzy: 351 on LPG 

 

Page 2 of 2 [ 19 posts ] Go to page Previous  1, 2

 
Posted: Fri Dec 15, 2006 9:45 am 
Smokin em up
Offline

Age: 40

Posts: 227

Joined: 21st Jun 2005

Location: Melbourne: Thornbury
VIC, Australia

Gas Research twin throttle.
440 primary, 400 secondary, twin B2's, twin AMR lock offs, 3/8 copper line then splits to two flex lines before the lock offs. McMillan tank. Self installed.

Might play a little with the tb's. The 440 is from a single carb kit i bought new for another 351 so is jetted correctly, the 400 has seen duty on a few of my 6 cyl set ups and would likely need the metering rod looked at. I'd be certain its running rich as it is.

Also considered using the smaller carb as the primary....easy enough to swap and swap back. I sourced an APA tank and want to re-do flex lines all the way from the tank to the convertors. Might take it in to get this done and dyno'd and complianced all at the same time.....cha ching rebate

btw there is no such thing as economy with a 3500 stall

 

_________________

EA SVO Fairmont Ghia - Recaros, Bilsteins, Sunroof, SVO rims and body kit, Genie headers, DBA rotors. T5 steeda triax short shifter. 3.27 lsd. (EL 4.0 ported/polished, rebuilt and balanced, Dev5 cam. J3 chipped EL ecu, AU injectors).

Top
 Profile  
 
 
Posted: Fri Dec 15, 2006 4:11 pm 
EFI Guru
Offline

Age: 52

Posts: 4289

Joined: 5th Nov 2004

Gallery: 28 images

Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

Walker wrote:
Why bother when max advance is in by 2800 Pete?
I can understand on petrol, but not LPG!
As we know, LPG burns slow at low rpm, and quick at high rpm, that's why they run the fast curve down low and drop it to 28 deg before mid range.


The point at which max advance is in, is irrelevent. Vac advance gives an offset on the mechanical advance curve that gives more or less advance depending on vaccum. Therefore it is spark based on load not just rpm. Spark based on just rpm is flawed.
Ideally you would have a fully mapped ignition computer but, in the absence of that you have vacuum advance.

Pete.
Top
 Profile  
 
 
Posted: Fri Dec 15, 2006 8:47 pm 
Getting Side Ways
Offline
User avatar

Age: 46

Posts: 8590

Joined: 5th Nov 2004

Gallery: 5 images

Ride: AU Fairlane 5.0, KE Laser, 01 Kw

Location: Melbourne
VIC, Australia

I realise how vacuum works, but the setup this guy is running it will always be at max advance either way.
Top
 Profile  
 
 
Posted: Sat Dec 16, 2006 9:23 am 
EFI Guru
Offline

Age: 52

Posts: 4289

Joined: 5th Nov 2004

Gallery: 28 images

Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

Walker wrote:
I realise how vacuum works, but the setup this guy is running it will always be at max advance either way.


If its always at max advance there something wrong with it. It has to go from idle to a higher rpm at some stage and you can't tell me it will never be driven at any load other flat out?
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 2 of 2  [ 19 posts ]  Go to page Previous  1, 2

Who is online

Users browsing this forum: Google [Bot] and 6 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 10:33 am All times are UTC + 11 hours

 

 

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