Rotor Phase on BBF with no crank trigger?

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Rotor Phase on BBF with no crank trigger?

Post  bigjohn2007 on June 5th 2014, 6:35 am

Try to figure out how i can check phase with locked out timing and no crank trigger.
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Re: Rotor Phase on BBF with no crank trigger?

Post  KY JELLY on June 5th 2014, 6:55 am

Rotor phasing is only required with a crank tigger , locked timing the distributor mechanism does not move and fires where the rotory button is at when the magnetic pickup in the dustributor is signaled by the reluctor inside the distributor and sends ignition box signal to fire.

Crank triggers are supposed to be more accurate , but 7000 rpm with a small diameter reluctor is a slower actual speed than a magnetic pickup on a crank trigger at 7000 rpm . The larger diameter spread has to be going much faster .
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Re: Rotor Phase on BBF with no crank trigger?

Post  bigjohn2007 on June 5th 2014, 10:57 am

KY JELLY wrote:Rotor phasing is only required with a crank tigger , locked timing the distributor mechanism does not move and fires where the rotory button is at when the magnetic pickup in the dustributor is signaled by the reluctor inside the distributor and sends ignition box signal to fire.

Crank triggers are supposed to be more accurate , but 7000 rpm with a small diameter reluctor is a slower actual speed than a magnetic pickup on a crank trigger at 7000 rpm . The larger diameter spread has to be going much faster .
Thanks KY
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Re: Rotor Phase on BBF with no crank trigger?

Post  DanH on June 5th 2014, 6:19 pm

To check with lock out dist. same way as a crank trigger. hole in the cap and a timing light.

A lock dist can be off

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Re: Rotor Phase on BBF with no crank trigger?

Post  DanH on June 5th 2014, 6:41 pm

KY JELLY wrote:Rotor phasing is only required with a crank tigger , locked timing the distributor mechanism does not move and fires where the rotory button is at when the magnetic pickup in the dustributor is signaled by the reluctor inside the distributor and sends ignition box signal to fire.

Crank triggers are supposed to be more accurate , but 7000 rpm with a small diameter reluctor is a slower actual speed than a magnetic pickup on a crank trigger at 7000 rpm . The larger diameter spread has to be going much faster .

"has to be" crank is at 7000 rpm dist. is 3500 rpm. wheel travel in feet per minute is very high to the dist'ers. So it is.

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Re: Rotor Phase on BBF with no crank trigger?

Post  bbf-falcon on June 5th 2014, 8:34 pm

I'm not a big fan of either, I will take the light springs anyday. But that's just me.Never could see the difference in performance w/it being locked,just the kicking back on the starter shit.

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Re: Rotor Phase on BBF with no crank trigger?

Post  richter69 on June 5th 2014, 9:49 pm

Ive phased the rotors w a locked dizzy and no CT, you have to slot the holes in the cap adapter though.

If it wasnt phased on the sb car when that 102 jet comes on the dish strainer would become a projectile.


Youd be surprised how far one can be off, you factor in the delayed signal of some of the boxes then it gets really f-cked up.
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Re: Rotor Phase on BBF with no crank trigger?

Post  richter69 on June 5th 2014, 9:52 pm

DanH wrote:To check with lock out dist. same way as a crank trigger. hole in the cap and a timing light.

A lock dist can be off


for once I agree 100 percent with Dan lol.
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Re: Rotor Phase on BBF with no crank trigger?

Post  KY JELLY on June 5th 2014, 10:53 pm

I can see that being an issue if you are pulling timing with a retard box
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Re: Rotor Phase on BBF with no crank trigger?

Post  69F100 on June 6th 2014, 11:38 pm

bbf-falcon wrote:I'm not a big fan of either, I will take the light springs anyday. But that's just me.Never could see the difference in performance w/it being locked,just the kicking back on the starter shit.

In my Mallory I run a light set of springs when it fires up no kick back the timing is all in by 1500rpm but I don't run NOS either and works fine for me.
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Re: Rotor Phase on BBF with no crank trigger?

Post  8liter on December 2nd 2015, 12:41 am

Ok. Im retarding timing with my box and the rotor is way past the post with no retard. This is a duraspark dist. Is there an adjustable rotor button for these. I tried adjusting the reluctor but all that did was change the timing
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Re: Rotor Phase on BBF with no crank trigger?

Post  kim on December 2nd 2015, 3:57 am

You have to move the rotor on the distributor shaft, The stock one is push locked. You need something where the rotor screws down onto the distributor, so you can slot and twist it.

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Re: Rotor Phase on BBF with no crank trigger?

Post  8liter on December 2nd 2015, 8:29 am

I've cut one in half, Twisted it and screwed it back down...but I would like something a little more sturdy..
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Re: Rotor Phase on BBF with no crank trigger?

Post  TommyK on December 2nd 2015, 9:33 am

To change the rotor phasing, change the relationship of the reluctor wheel to the rotor by making an offset groove for the reluctor wheel roll pin.

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Re: Rotor Phase on BBF with no crank trigger?

Post  8liter on December 2nd 2015, 10:25 am

Tommy, I tried that already. I still had to rotate the distributor to get the timing back where it was...I tried multiple locations with the reluctor. Maybe I haven't found the sweet spot..?
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Re: Rotor Phase on BBF with no crank trigger?

Post  gmsmkr on December 2nd 2015, 11:36 am

8liter, is this on the turbo car??
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Re: Rotor Phase on BBF with no crank trigger?

Post  rmcomprandy on December 2nd 2015, 11:52 am

With a Ford Dura-spark distributor ... All you need to do is file the locating slot in the cap adapter and rotate it as needed. Then epoxy that cap adapter to the distributor housing.

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Re: Rotor Phase on BBF with no crank trigger?

Post  8liter on December 2nd 2015, 5:00 pm

Well after about 10 tries I finally got the spark on the leading edge of the button...lol
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Re: Rotor Phase on BBF with no crank trigger?

Post  8liter on December 3rd 2015, 8:06 am

Yes,its my turbo car. Randy, that's a good idea. Thats probably easier than the 10 different grooves I filed in the reluctor....lol
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Re: Rotor Phase on BBF with no crank trigger?

Post  jones on December 3rd 2015, 9:42 am

How hard would it be to spline the shaft where the rotor attaches and make a matching splined rotor? (The fine'r the splines the more accurate you could get it. I would have thought someone would have made something like this all ready.)

When my engine was on the dyno we found that your timing at 4,000rpm is not what it is at 6,500rpm. Even when the distributor was locked the timing moved. That made the dyno time well worth it's money for me. As to how it's moving we could never find a exact reason, only theories.

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Re: Rotor Phase on BBF with no crank trigger?

Post  kim on December 3rd 2015, 8:06 pm

jones,

belt or chain? Timing variation because of RPM....

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Re: Rotor Phase on BBF with no crank trigger?

Post  jones on December 3rd 2015, 10:37 pm

kim wrote:jones,

belt or chain?    Timing variation because of RPM....  

That's on a locked distributor! you have to ask; is the differance between the camshaft and crank or between the pick-up and rotor?

It's a roller chain,

MSD 8578 351 Pro Billet, small cap with a bronze gear change to fit the 521. It is solid roller camshaft but it's nothing big as its a pump gas engine. I would have guessed the belt version to have more give.

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