ignition questions?
 

with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
coil, lighter centrifigal advance spring in it. i was running 12 degrees
advance on super unleaded and had to go all the way down to 6 degrees to get
it to stop pinging up hills. but now it is allot harder to start when it is
cold. anyone have any ideas what i could do to get it to start better? is 6
degrees to low on the timing? should i put the stock centrifigal spring back
in it to not get so much advance at higher rpm's? i just want to get the
jeep to run on pump gas and start nice. thanks carmine

Re: ignition questions?
 

I would blame the cheaper gasoline.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

carmine colangelo wrote:
>
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to get
> it to stop pinging up hills. but now it is allot harder to start when it is
> cold. anyone have any ideas what i could do to get it to start better? is 6
> degrees to low on the timing? should i put the stock centrifigal spring back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine

Re: ignition questions?
 

I would blame the cheaper gasoline.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

carmine colangelo wrote:
>
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to get
> it to stop pinging up hills. but now it is allot harder to start when it is
> cold. anyone have any ideas what i could do to get it to start better? is 6
> degrees to low on the timing? should i put the stock centrifigal spring back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine

Re: ignition questions?
 

I would blame the cheaper gasoline.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

carmine colangelo wrote:
>
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to get
> it to stop pinging up hills. but now it is allot harder to start when it is
> cold. anyone have any ideas what i could do to get it to start better? is 6
> degrees to low on the timing? should i put the stock centrifigal spring back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine

Re: ignition questions?
 

I would blame the cheaper gasoline.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

carmine colangelo wrote:
>
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to get
> it to stop pinging up hills. but now it is allot harder to start when it is
> cold. anyone have any ideas what i could do to get it to start better? is 6
> degrees to low on the timing? should i put the stock centrifigal spring back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine

Re: ignition questions?
 

"carmine colangelo" <carmine7@optonline.net> wrote in message
news:_P6yc.2$8a2.2520@news4.srv.hcvlny.cv.net...
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to
get
> it to stop pinging up hills. but now it is allot harder to start when it
is
> cold. anyone have any ideas what i could do to get it to start better? is
6
> degrees to low on the timing? should i put the stock centrifigal spring
back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine
>
>

Much of this depends on how your vehicle's ignition is set up. The main
factor is the vacuum advance. Some people use ported vacuum and some use
manifold vacuum. I personally prefer manifold vacuum because it will
compensate for throttle opening and engine load. Chances are your vacuum
advance is currently using ported vacuum. The easiest way to check is to
follow the vacuum advance hose from the distributor and see where it enters
the engine. If it is somewhere in between the throttle plate and the head,
it is manifold vacuum. If it somewhere before the throttle plate in the
intake system, then it is ported.

The problem with ported vacuum IMO is that it increases the timing at part
throttle load at the same time the mechanical advance is doing the same
thing. This will work OK if you leave the advance springs stock, but this
isn't necessarily the most efficient setup.

The manifold vacuum advance setup has a nice advantage in that it will
retard the timing under heavy load and or heavy throttle conditions, which
is when you need the timing to back down a bit. When you are back to
cruising throttle opening and regular load conditions, the manifold vacuum
goes up and advances the timing back to its maximum.

What I would do here would be to switch the vacuum advance to manifold
vacuum, leave the light springs in place, and then set the timing to 2
degrees more than stock. Take the vehicle for a ride and make sure it
doesn't ping. Advance the timing another 2 degrees and repeat the test. Keep
doing this until you get pinging, or the engine drags on the starter when it
is hot.

Also, most spring kits do not increase the amount of mechanical advance,
they change the rate at which the timing advances. You normally have to
change the weight's shape to increase the amount of advance.

Chris

Re: ignition questions?
 

"carmine colangelo" <carmine7@optonline.net> wrote in message
news:_P6yc.2$8a2.2520@news4.srv.hcvlny.cv.net...
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to
get
> it to stop pinging up hills. but now it is allot harder to start when it
is
> cold. anyone have any ideas what i could do to get it to start better? is
6
> degrees to low on the timing? should i put the stock centrifigal spring
back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine
>
>

Much of this depends on how your vehicle's ignition is set up. The main
factor is the vacuum advance. Some people use ported vacuum and some use
manifold vacuum. I personally prefer manifold vacuum because it will
compensate for throttle opening and engine load. Chances are your vacuum
advance is currently using ported vacuum. The easiest way to check is to
follow the vacuum advance hose from the distributor and see where it enters
the engine. If it is somewhere in between the throttle plate and the head,
it is manifold vacuum. If it somewhere before the throttle plate in the
intake system, then it is ported.

The problem with ported vacuum IMO is that it increases the timing at part
throttle load at the same time the mechanical advance is doing the same
thing. This will work OK if you leave the advance springs stock, but this
isn't necessarily the most efficient setup.

The manifold vacuum advance setup has a nice advantage in that it will
retard the timing under heavy load and or heavy throttle conditions, which
is when you need the timing to back down a bit. When you are back to
cruising throttle opening and regular load conditions, the manifold vacuum
goes up and advances the timing back to its maximum.

What I would do here would be to switch the vacuum advance to manifold
vacuum, leave the light springs in place, and then set the timing to 2
degrees more than stock. Take the vehicle for a ride and make sure it
doesn't ping. Advance the timing another 2 degrees and repeat the test. Keep
doing this until you get pinging, or the engine drags on the starter when it
is hot.

Also, most spring kits do not increase the amount of mechanical advance,
they change the rate at which the timing advances. You normally have to
change the weight's shape to increase the amount of advance.

Chris

Re: ignition questions?
 

"carmine colangelo" <carmine7@optonline.net> wrote in message
news:_P6yc.2$8a2.2520@news4.srv.hcvlny.cv.net...
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to
get
> it to stop pinging up hills. but now it is allot harder to start when it
is
> cold. anyone have any ideas what i could do to get it to start better? is
6
> degrees to low on the timing? should i put the stock centrifigal spring
back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine
>
>

Much of this depends on how your vehicle's ignition is set up. The main
factor is the vacuum advance. Some people use ported vacuum and some use
manifold vacuum. I personally prefer manifold vacuum because it will
compensate for throttle opening and engine load. Chances are your vacuum
advance is currently using ported vacuum. The easiest way to check is to
follow the vacuum advance hose from the distributor and see where it enters
the engine. If it is somewhere in between the throttle plate and the head,
it is manifold vacuum. If it somewhere before the throttle plate in the
intake system, then it is ported.

The problem with ported vacuum IMO is that it increases the timing at part
throttle load at the same time the mechanical advance is doing the same
thing. This will work OK if you leave the advance springs stock, but this
isn't necessarily the most efficient setup.

The manifold vacuum advance setup has a nice advantage in that it will
retard the timing under heavy load and or heavy throttle conditions, which
is when you need the timing to back down a bit. When you are back to
cruising throttle opening and regular load conditions, the manifold vacuum
goes up and advances the timing back to its maximum.

What I would do here would be to switch the vacuum advance to manifold
vacuum, leave the light springs in place, and then set the timing to 2
degrees more than stock. Take the vehicle for a ride and make sure it
doesn't ping. Advance the timing another 2 degrees and repeat the test. Keep
doing this until you get pinging, or the engine drags on the starter when it
is hot.

Also, most spring kits do not increase the amount of mechanical advance,
they change the rate at which the timing advances. You normally have to
change the weight's shape to increase the amount of advance.

Chris

Re: ignition questions?
 

"carmine colangelo" <carmine7@optonline.net> wrote in message
news:_P6yc.2$8a2.2520@news4.srv.hcvlny.cv.net...
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to
get
> it to stop pinging up hills. but now it is allot harder to start when it
is
> cold. anyone have any ideas what i could do to get it to start better? is
6
> degrees to low on the timing? should i put the stock centrifigal spring
back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine
>
>

Much of this depends on how your vehicle's ignition is set up. The main
factor is the vacuum advance. Some people use ported vacuum and some use
manifold vacuum. I personally prefer manifold vacuum because it will
compensate for throttle opening and engine load. Chances are your vacuum
advance is currently using ported vacuum. The easiest way to check is to
follow the vacuum advance hose from the distributor and see where it enters
the engine. If it is somewhere in between the throttle plate and the head,
it is manifold vacuum. If it somewhere before the throttle plate in the
intake system, then it is ported.

The problem with ported vacuum IMO is that it increases the timing at part
throttle load at the same time the mechanical advance is doing the same
thing. This will work OK if you leave the advance springs stock, but this
isn't necessarily the most efficient setup.

The manifold vacuum advance setup has a nice advantage in that it will
retard the timing under heavy load and or heavy throttle conditions, which
is when you need the timing to back down a bit. When you are back to
cruising throttle opening and regular load conditions, the manifold vacuum
goes up and advances the timing back to its maximum.

What I would do here would be to switch the vacuum advance to manifold
vacuum, leave the light springs in place, and then set the timing to 2
degrees more than stock. Take the vehicle for a ride and make sure it
doesn't ping. Advance the timing another 2 degrees and repeat the test. Keep
doing this until you get pinging, or the engine drags on the starter when it
is hot.

Also, most spring kits do not increase the amount of mechanical advance,
they change the rate at which the timing advances. You normally have to
change the weight's shape to increase the amount of advance.

Chris

Re: ignition questions?
 

What kind of carb are you running?

Do you have the correct gas filter in it and is it in right side up?

Which vacuum advance are you running?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

carmine colangelo wrote:
>
> with the gas prices going so high i am tying to get my 1986 jeep cj7 258 6
> cyl with a r.v. cam (for low torque) to run on pump gas. i have a msd ss
> coil, lighter centrifigal advance spring in it. i was running 12 degrees
> advance on super unleaded and had to go all the way down to 6 degrees to get
> it to stop pinging up hills. but now it is allot harder to start when it is
> cold. anyone have any ideas what i could do to get it to start better? is 6
> degrees to low on the timing? should i put the stock centrifigal spring back
> in it to not get so much advance at higher rpm's? i just want to get the
> jeep to run on pump gas and start nice. thanks carmine