Optimum safe igntion advance?
Optimum safe igntion advance?
I've built a 16V 4AGE for racing {(in my Westfeild Eleven). It's on carbs and programmable ignition. 11:1 CR, 288 deg, 8.5mm lift cam. Typically what is the max safe advance to run? Not had it on a rolling road yet but want to set it to something safe whilst I bed it in on the road. I'm guessing 28 deg total advance should be about right, running on super unleaded, but would appreciate input from those who know.
- oldeskewltoy
- Club4AG MASTER
- Posts: 2184
- Joined: Wed Jan 09, 2013 4:44 pm
- Location: Portland, Oregon
Re: Optimum safe igntion advance?
tons of ignition maps out there... simply google "4age maps"
OST Cyl head porting, - viewtopic.php?f=22&t=300
Building a great engine takes knowing the end... before you begin
Enjoy Life... its the only one you get!
Building a great engine takes knowing the end... before you begin
Enjoy Life... its the only one you get!
Re: Optimum safe igntion advance?
In the end it depends on the knock limit and exhaust gas temperatures.
-
- Club4AG Pro
- Posts: 653
- Joined: Tue Mar 26, 2013 5:21 am
- Location: Oxford U.K
Re: Optimum safe igntion advance?
28° should be ok until you get it run in enough to calibrate it properly.
Re: Optimum safe igntion advance?
As said above... 28 is safe. I have run my 16V (10.3:1, ITB's, 272 cams EFI) as high
as 35 deg all in at 4000rpm without problems. However, there doesn't seem to be any
more performance to gained by going higher than 32 deg.
Cheers... jondee86
as 35 deg all in at 4000rpm without problems. However, there doesn't seem to be any
more performance to gained by going higher than 32 deg.
Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.
Re: Optimum safe igntion advance?
Thanks for the feedback. I'll stick with 28 deg until rolling road on 5 May. Then hopefully first race of the season 7th May.
-
- Club4AG Enthusiast
- Posts: 65
- Joined: Thu Jan 10, 2013 1:42 pm
Re: Optimum safe igntion advance?
Nice setup.
Last edited by 86 Corolla on Wed Jul 25, 2018 8:28 am, edited 1 time in total.
Re: Optimum safe igntion advance?
In the UK. And the Eleven is somewhat different to the Westy 7 type cars! Chassis not too dissimilar to the early live axle cars though. Still manages to be just a shade over 500gk with the 4AGE. I do have a dogcam bullet camera and once I'm happy the new drivetrain is reliable I'll aim to get some footage and post on YouTube. Meanwhile it is feeling very strong on our backroads as I bed it in!
-
- Club4AG MASTER
- Posts: 2084
- Joined: Sun Jan 13, 2013 1:18 pm
- Contact:
Re: Optimum safe igntion advance?
Partially related. Some people here might find some useful info in this article.
https://www.hpacademy.com/technical-art ... for-knock/
https://www.hpacademy.com/technical-art ... for-knock/