Advise
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 816
Likes: 1
From: Finland
Advise
I have 1968 Hi-Perf 396 BB with Accel dual points distributor without vacuum canister. I use rpm range 0-6500.
1. is the right dwell angle 27 degrees?
2. is maximun advance ok to set to 36 degrees
After setting like this on very low rpm and especially with cold or half cold engine when I slightly add gas the engine sometimes coughs in the intake and dies away. I know before setting the dwell and advance I used to have too much advance, but maybe now when the max is 36 degrees and the idle is around 6 degrees the 6 is too little??? And maybe the vacuum canister could be the cure??? Or do you think my carb mixtures could be the reason ???
Heard from a guy that actually I should cut the mechanical advance scale rather than add vacuum canister - by this I could keep the 36 total advance and if able to cut existing scale from 6-36=30 to 12-36=24 then I would have 12 degrees idle advance - do you agree this might be the cure? Sounds solid to me...
1. is the right dwell angle 27 degrees?
2. is maximun advance ok to set to 36 degrees
After setting like this on very low rpm and especially with cold or half cold engine when I slightly add gas the engine sometimes coughs in the intake and dies away. I know before setting the dwell and advance I used to have too much advance, but maybe now when the max is 36 degrees and the idle is around 6 degrees the 6 is too little??? And maybe the vacuum canister could be the cure??? Or do you think my carb mixtures could be the reason ???
Heard from a guy that actually I should cut the mechanical advance scale rather than add vacuum canister - by this I could keep the 36 total advance and if able to cut existing scale from 6-36=30 to 12-36=24 then I would have 12 degrees idle advance - do you agree this might be the cure? Sounds solid to me...
Last edited by Vesa; Sep 6, 2004 at 03:55 AM.
Burning Brakes
Joined: Feb 2004
Posts: 958
Likes: 1
From: In the Beautiful Shenandoah Valley of VA
Vesa,
I'm not familiar with the Accel distributor, but here's what I run on all of my big blocks: 20 degrees initial timing; 14 degrees mechanical, all in by 2500 rpm (you must limit the mechanical advance with this much initial), and full vacuum advance. These engines love additional advance under part throttle conditions. Since there is no vacuum under wide open throttle conditions, it doesn't impact power under those conditions. I strongly encourage vacuum advance for most street engines, short of a basic race engine on the street.
Steve
I'm not familiar with the Accel distributor, but here's what I run on all of my big blocks: 20 degrees initial timing; 14 degrees mechanical, all in by 2500 rpm (you must limit the mechanical advance with this much initial), and full vacuum advance. These engines love additional advance under part throttle conditions. Since there is no vacuum under wide open throttle conditions, it doesn't impact power under those conditions. I strongly encourage vacuum advance for most street engines, short of a basic race engine on the street.
Steve
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 816
Likes: 1
From: Finland
Originally Posted by Steve's74
Vesa,
I'm not familiar with the Accel distributor, but here's what I run on all of my big blocks: 20 degrees initial timing; 14 degrees mechanical, all in by 2500 rpm (you must limit the mechanical advance with this much initial), and full vacuum advance. These engines love additional advance under part throttle conditions. Since there is no vacuum under wide open throttle conditions, it doesn't impact power under those conditions. I strongly encourage vacuum advance for most street engines, short of a basic race engine on the street.
Steve
I'm not familiar with the Accel distributor, but here's what I run on all of my big blocks: 20 degrees initial timing; 14 degrees mechanical, all in by 2500 rpm (you must limit the mechanical advance with this much initial), and full vacuum advance. These engines love additional advance under part throttle conditions. Since there is no vacuum under wide open throttle conditions, it doesn't impact power under those conditions. I strongly encourage vacuum advance for most street engines, short of a basic race engine on the street.
Steve
Burning Brakes
Joined: Feb 2004
Posts: 958
Likes: 1
From: In the Beautiful Shenandoah Valley of VA
Originally Posted by Vesa
I now succeeded to change to 36-16 meachanical (not possible to adjyst further with this distributor. I plan to buy MSD tach drive with vacuum. What shoud I use then? 36-20 + vacuum, but how much vacuum should I seek for ? Initial 20+?
Steve
