Performance Boats Forum banner

1 - 20 of 35 Posts

·
Registered
Joined
·
379 Posts
Discussion Starter #1
Can someone tell me what the benefits are (if any) To "locking out" the mechanical advance in a MSD Pro billet distributor? When would you want to do this? I'm running A BBC with a 6-71 and according to MSD my old distributor wouldn't come into full advance until 4500rpm. My 660 times were always slow but picked up on the top-end. If I locked out the timing I'm thinking this would help with the that? Am I crazy? It makes sense to me just not sure if doing so will damage anything. Or would it be better to set up the distributor with the lightest springs and biggest bushings to get full advance at about 2500rpm?
 

·
Banned
Joined
·
293 Posts
You want the lightest springs. All in , 24* at 2,000. Real quick curve. You won't need the vac. advance, block it off.
 

·
Members only
Joined
·
4,518 Posts
Can someone tell me what the benefits are (if any) To "locking out" the mechanical advance in a MSD Pro billet distributor? When would you want to do this? I'm running A BBC with a 6-71 and according to MSD my old distributor wouldn't come into full advance until 4500rpm. My 660 times were always slow but picked up on the top-end. If I locked out the timing I'm thinking this would help with the that? Am I crazy? It makes sense to me just not sure if doing so will damage anything. Or would it be better to set up the distributor with the lightest springs and biggest bushings to get full advance at about 2500rpm?
If this is in a jet boat I would lock it out. They come up so quick un like a v-drive or outdrive that the load is not a problem. I think you will find it starts better & runs cleaner down low.
 

·
Registered
Joined
·
178 Posts
As said depends on drive system. You want your advance in as early as posible. I have never seen it as late as 4500. The only reason for advace is to ease starting and to help prevent preignition during engine acceleration under heavey load. So yea what maxi said
 

·
Registered
Joined
·
379 Posts
Discussion Starter #6
Great Feedback thanks guys! Yes its a jet 19' Nordic tunnel to be exact. I'm going to try it locked out. see what happens..
 

·
Registered
Joined
·
6,278 Posts
Great Feedback thanks guys! Yes its a jet 19' Nordic tunnel to be exact. I'm going to try it locked out. see what happens..
you'll be better off as long as you can get it to start without kicking back. If not then as little mech advance as possible and have it in as soon as possible. my.02
 

·
Registered
Joined
·
4,045 Posts
you'll be better off as long as you can get it to start without kicking back. If not then as little mech advance as possible and have it in as soon as possible. my.02
Or wouldn't a start retard box do the trick?
I have noticed that MSD dizzy's seem to have a very tight setup out of the box!
 

·
Registered
Joined
·
6,278 Posts
Or wouldn't a start retard box do the trick?
I have noticed that MSD dizzy's seem to have a very tight setup out of the box!
If his box has that option then yes, but I wouldnt buy another box just for that. Not to mention that the site has a few posts with people having issues with all that crap.
I've see elect. distributors come out of the box with 24* of mech advance and pretty stiff springs that dont allow it all in till 3500rpm or so.
It would work fine with 12* of advance and it all in just above idle, but this is on a higher comp. deal with kickback problems. The OP has a 6-71 blower on gas so he's probably 8.5-1 comp. It should start fine just locked out.
 

·
Registered
Joined
·
379 Posts
Discussion Starter #10 (Edited)
My box is a 6al. Unsure if it has the option for a buzz box. Is that for a timing retard? I saw some devices that allows for timing changes that work with different boxes. Yes its gas, 110 always. Compression is 9-1 I run the blower @ 11.7 over making 10/11lbs. @ 6000rpm.
 

·
Premium Member
Joined
·
25,975 Posts
No one is talking about a buzz box. They're talking about a timing retard for the start. As Hass stated, there have been issues with MSD retard devices, but that is more in the devices trying to control the running timing. This thing is a little simpler in that it retards your set point 10 or 20 degrees only on the start and then reverts to the timing you set. But you shouldn't need it if you have a good battery and starter on a pump gas motor.




100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
 

·
Registered
Joined
·
379 Posts
Discussion Starter #12 (Edited)
Ya that's the box I was taking about.Sorry your right GN good catch. Some one mentioned a MSD dizzy. Thats what I was taking about whether or not my box was capable of the upgrade. So when would one of those timing retard boxes be needed?
 

·
Premium Member
Joined
·
25,975 Posts

·
Members only
Joined
·
4,518 Posts
Something Bob forgot to mention about hard starting... If you find the motor wants to kick back on the starter then give it a couple squirts of fuel before rolling it over. On my injected big motor if you try starting it lean it will rip the starter off the motor. Add fuel and wella its a peach!:)
 

·
Banned
Joined
·
293 Posts
Something Bob forgot to mention about hard starting... If you find the motor wants to kick back on the starter then give it a couple squirts of fuel before rolling it over. On my injected big motor if you try starting it lean it will rip the starter off the motor. Add fuel and wella its a peach!:)

WRONG.... IF IT KICKS BACK LIKE THAT, BACK OF THE TIMING. IT'S TOO MUCH.:)bulb
 

·
Premium Member
Joined
·
3,359 Posts
I agree with Maxi, a couple of shots of fuel does make a difference. FWIW, what I have done (30 yrs now) is run a locked out (34 degrees) magneto or an occasional MSD deal. These were mostly all blower motors. I always run a seperate toggle kill switch (in addition to the safety kill disconnect). Starting drill is; Toggle switch off, 2 full pumps of fuel, hold throttle 1/8 open, spin motor over just a few seconds, switch toggle on and motor always lights off. No drama, no kicking back. As an aside, I've always preferred stock GM HD starter motors. The mini-starters (both cheap & expensive ones) just don't seem to spin the motor fast enough.
Just my .02 (without any shouting!). Jocko
 

·
Registered
Joined
·
178 Posts
WRONG.... IF IT KICKS BACK LIKE THAT, BACK OF THE TIMING. IT'S TOO MUCH.:)bulb
Stick to the smiles as they make you appear smater because YOU ARE WRONG AGIN!. A lean condition will cause starter kick back as maxi stated. Same starting procces as jockorace here. It its allways best to get the engine spinning over then light it.
 

·
Banned
Joined
·
293 Posts
Can someone tell me what the benefits are (if any) To "locking out" the mechanical advance in a MSD Pro billet distributor? When would you want to do this? I'm running A BBC with a 6-71 and according to MSD my old distributor wouldn't come into full advance until 4500rpm. My 660 times were always slow but picked up on the top-end. If I locked out the timing I'm thinking this would help with the that? Am I crazy? It makes sense to me just not sure if doing so will damage anything. Or would it be better to set up the distributor with the lightest springs and biggest bushings to get full advance at about 2500rpm?

The subject here is Timing . Thats all I was anwering to. :bangmyhead:
 
1 - 20 of 35 Posts
Top