rstp

  • Karma: +0/-0
timming settings on a midly built 454
« on: February 14, 2011, 07:15:14 AM »
morning i would like to know what the base timming is as ive set it at idle 1200 rpm 13degrees btdc but when i bring the rpms to 2500-3000 rpm i get only 27degrees btdc shoulden i be around 36 degrees stock HEI distributor

THANKS
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

terrytav

  • Karma: +1/-0
Re: timming settings on a midly built 454
« Reply #1 on: February 14, 2011, 08:01:51 AM »
 I would set the timing at 32 Degrees at 2500 RPM s The distributor has a built in advance weather it be vacuum or Mechanical.
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

SLCKREG

  • Karma: +0/-0
Re: timming settings on a midly built 454
« Reply #2 on: February 14, 2011, 02:10:27 PM »
morning i would like to know what the base timming is as ive set it at idle 1200 rpm 13degrees btdc but when i bring the rpms to 2500-3000 rpm i get only 27degrees btdc shoulden i be around 36 degrees stock HEI distributor

THANKS
Personally I think 36* is gonna be about right...lotsa variables. I run about 40 but I live at 4000+ ft elevation. I locked my dizzy out...idles better...better throttle response....makes setting timing a breeze. But I guess that is a whole another thread.lol O0
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

crewchief22

  • Karma: +66/-0
Re: timming settings on a midly built 454
« Reply #3 on: February 14, 2011, 08:49:46 PM »
It sounds like you're not getting full advance in the distributor (normally about 20 degrees by 3000rpm).

I set mine to 36 degrees total with the boat in the water under mild load (cruising with rpm above 3000).

based on what you've said, you would need 22 degrees initial timing to get 36 total... This might give you problems getting it started.

I think you need to inspect the distributor closely and maybe buy a new advance kit to try out.
  • Boat #1: '77 Hondo Pantera GT Jet
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
"Racing is life!  Anything that happens before or after, is just waiting"    Steve McQueen

The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

rstp

  • Karma: +0/-0
Re: timming settings on a midly built 454
« Reply #4 on: February 15, 2011, 06:48:55 AM »
Thanks guys ill re-check the adv. springs and weights and see if i can get 36 degrees at 3000 rpm without checking it at idle and go from there also if i remember right i dont think last time i played with it that i could get past 27 degees so that would mean that somethings sticking or the advance springs are to stiff are the springs marked for stiffnest once again thanks.
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

orange bahner

  • Karma: +0/-0
Re: timming settings on a midly built 454
« Reply #5 on: February 15, 2011, 10:30:35 AM »
You haven't said if you are running a jet or v-drive.  In a jet getting total advance quicker will not hurt you.  I am running a 468BBC with a comp cams extreme marine hyd roller with HEI.  I have it set up to get total advance at 2200 rpm and have the total timing at 36deg. When at idle 1100 rpm timing is at 16deg with the weakest advance springs available for an hei dizzy. Depending on your cam choice will determine idle timing needed........Just my 2 cents
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
9 out of 10 dentist recommend oral sex

GT Jets

  • Karma: +192/-0
Re: timming settings on a midly built 454
« Reply #6 on: February 15, 2011, 07:49:12 PM »
You haven't said if you are running a jet or v-drive.  In a jet getting total advance quicker will not hurt you.  I am running a 468BBC with a comp cams extreme marine hyd roller with HEI.  I have it set up to get total advance at 2200 rpm and have the total timing at 36deg. When at idle 1100 rpm timing is at 16deg with the weakest advance springs available for an hei dizzy. Depending on your cam choice will determine idle timing needed........Just my 2 cents


Good point...

A jet pump does not use much motor in the lower RPM's torque requirement wise, they start to pull some HP at about 3,000 RPM so since it is already at speed, it wont hurt to have the time "in" at that RPM, 36*BTDC is about the norm for a BBC with a compression ratio lower than 10:1 on good pump gas.

I would set it to 36* at 2500 and let her buck... :thumbup:

However, if you have problems starting it, it may require a seperate ignition toggle to get it cranking before you light the coil to keep it from killing the starter/battery while starting.

Most mechanical advances have approx 15 degrees of timing advance built into them.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

rstp

  • Karma: +0/-0
Re: timming settings on a midly built 454
« Reply #7 on: March 05, 2011, 07:09:06 AM »
Well toke some advice from eveyone and problem resolved had one advance weight sticking repaiered and then set timming at 36 deg at 2500 rpm runs good also starts great have idle set at 1200 rpm  Thanks for the help guys
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

 


Null

SMFPacks CMS 1.0.3 © 2021