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Old 08-18-2016, 05:23 PM   #1
killer puller
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Default Spark Requirements

I just got off the dyno with my BBF 532. Spent a whole day and got nowhere with the tune up. Took the weekend off to anylise what was going on. Came to the conclusion it had to be ignition problems. We spent a whole day messing with fuel and timing. It didn't matter how much fuel we through at it, the electrode on the plug was white. We could kill power with adding fuel but the plugs still showed lean and egt,s stayed hot. O2,s showed rich so eventually we just trusted the O2,s and tuned accordingly. It ran terrible regardless of the tuneup. We started with C-16 and switched to C-14 thinking we might have a bad pail of fuel. We made a additional 50 hp with the switch but the characteristics never changed. It ran a little better but not a bunch. Started in on it Monday AM and pulled the carb off to check for reversion problems. Didn't see anything that would suggest that so we changed plugs and went from .020 gap to .018 and changed ignition from the 7AL-2 on the dyno to my 7AL-3. Changed the blaster coil to my HVC-2 coil. We made a pass on the dyno and made considerable improvements but still not running great. We replaced the cap, rotor, magnetic pickup, and wires next and made a little gain again but still not perfect. We add some timing and it helps but still not great. Next we pull the plugs and close the gap to .015 and that helped a lot. It still had a intermittent studder but ran pretty clean. We were out of c-14 before we got this far and this was with c-16 so I think it may run perfect with the C-14 with this tune up. I called NGK and explained what was happening and they suggested going to a heat range 10 plug from the heat range 9 I was running. Is there anything else I'm overlooking? I had multiple timing marks on the plugs on day 1 as well, I forgot to add that. Super happy with the power it made just don't want any issues.
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Old 08-18-2016, 06:00 PM   #2
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Default Re: Spark Requirements

I surely wouldnt think that a plug reading lean would be an ignition problem, if anything its not getting enough fuel. I know you said that you kept putting fuel to it with no result but it very well could be a intake flow issues, 2 and 4 on mine are almost 2 point different from each other in air fuel, we kept adding fuel and #4 would get fat and 2 would stay lean.
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Old 08-18-2016, 06:04 PM   #3
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Default Re: Spark Requirements

I could get the base of the plug to go black but the strap was always white.
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Old 08-18-2016, 06:14 PM   #4
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Default Re: Spark Requirements

What is the combo? Carb? coilpack or distributor? ? Any pics of engine?
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Old 08-18-2016, 06:24 PM   #5
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This is a 4.150 stroke, 4.52 bore. Old motorsports A460 cyl heads with a ton of work done to them, 16:1 compression, sheet metal intake and a single Braswell 7395 carb. 6 stage dry sump with a vac pump, low tension rings, enclosed cam tunnel. I don't know if I have any pics but I will try to get one on here. Made just over 1200 hp at 8200 rpm on C-16 single carb.
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Old 08-18-2016, 06:58 PM   #6
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Default Re: Spark Requirements

Electrode isn't where the fuel is...
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Old 08-18-2016, 07:01 PM   #7
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Ignition is a MSD 7AL-3, with the HVC-2 coil, Moroso wires, MSD magnetic pickup, running a distributor in oem location and a Danny Bee belt drive.
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Old 08-18-2016, 07:03 PM   #8
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Quote:
Originally Posted by E.R. Racing View Post
Electrode isn't where the fuel is...
Thats interesting, it is requiring alot of timing. 40 degrees is alot for a bbf.
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Old 08-18-2016, 07:10 PM   #9
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Default Re: Spark Requirements

Try putting some more ground straps on engine. One from each head and direct to battery ground, not just chassis ground.
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Old 08-18-2016, 07:22 PM   #10
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Originally Posted by BIGBLOCKMARK View Post
Try putting some more ground straps on engine. One from each head and direct to battery ground, not just chassis ground.
I have it set up this way in the truck, but it wasn't on the dyno stand. Do you all think that the spark system is sufficient?
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Old 08-18-2016, 09:18 PM   #11
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Default Re: Spark Requirements

seems efficent to me, ive never seen a ground strap that was the same color as the base though. I know on Q mine is always a nice briown tan color on the strap.
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Old 08-18-2016, 09:56 PM   #12
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Default Re: Spark Requirements

Neither of your coils work with the ignition box
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Old 08-18-2016, 10:01 PM   #13
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Default Re: Spark Requirements

8251,8252,8261 work with your box.
Or 8201
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Old 08-18-2016, 10:47 PM   #14
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Default Re: Spark Requirements

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Originally Posted by Screwblower View Post
8251,8252,8261 work with your box.
Or 8201
Where did you get the information from? I ran this set up for 5 years then switched to a digital 7 with the same coil and the coil burned up in the same year. Replaced the coil but I had someone complain about the ignition once because it can be used as a traction control device. So I put my old setup back in it.I have never had a issue until now. The setup on the dyno was a 7AL 2 with the blaster coil and that was worse.
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Old 08-18-2016, 10:50 PM   #15
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Default Re: Spark Requirements

I do have a 8251 coil on the shelf. It's been my spare. I'll change it if that would be better.
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