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Re: I still have pinging problems with my 512 [Re: Boise Chall] #964139 04/02/11 02:33 PM 04/02/11 02:33 PM
Joined: Jan 2003 Posts: 20,460 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,460 Eagle, Idaho	United Oil sells race gas from what I hear. I have no idea if they are open on weekends though.

Re: I still have pinging problems with my 512 [Re: Neil] #964140 04/02/11 03:01 PM 04/02/11 03:01 PM
Joined: Jun 2009 Posts: 659 Boise Idaho B Boise Chall OP mopar
Boise Chall OP mopar B Joined: Jun 2009 Posts: 659 Boise Idaho	I usually get it from there But their closed on the weekends

Re: I still have pinging problems with my 512 [Re: ahy] #964141 04/02/11 06:26 PM 04/02/11 06:26 PM
Joined: Nov 2003 Posts: 3,426 Dandridge TN D Dabee master
Dabee master D Joined: Nov 2003 Posts: 3,426 Dandridge TN	Quote: ping at half throttle suggests the timing curve is too aggressive. A slow mechanical advance with full advance delayed to 3000 RPM may help. I had the same pinging issue with my street 512. Similar build only with Indy EZ heads and Gear Venders. I recurved the distributor, MSD billet. I had the silver springs installed to get full advance at 1800 RPM. Good for a race engine not so good on the street. I replace one of the silver springs with a blue spring to slow down the advance. Problem solved.

Re: I still have pinging problems with my 512 [Re: Boise Chall] #964142 04/02/11 06:48 PM 04/02/11 06:48 PM
Joined: Aug 2003 Posts: 8,716 Baltimore/Denver 64Post master
64Post master Joined: Aug 2003 Posts: 8,716 Baltimore/Denver	Quote: I'll have to check my Idle vacuum again but I think I have 9" at idle in gear Holley recommended the 2.5 power valve. I believe a 4.5 PV is recommended with 9" of vacuum in gear, not to suggest this your only problem. General rule of thumb is half of the idle vacuum. I agree with the other suggestions of fuel, and possibly slowing the curve.

Re: I still have pinging problems with my 512 [Re: Boise Chall] #964143 04/02/11 11:13 PM 04/02/11 11:13 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	No my holly books say 1.5 to 2.5 below in gear idle vacuum so a 6.5 would likely be spot on. you use 2.5's om 300 @ .050 roller cams!! You must have misunderstood or the 3.75 a hour kids are confusing you! Thrust me try a 6.5 the 1/2 vacuum numbers are for real stock cams with 17 in gear vacuum so 1/2 is 8.5 Power valve is $9 and won't hurt anything (you probaly have a 6.5 laying around) quick and easy to try an cannot hurt anything. If it was a 8.5 with 9: vaccum it might flutter open at idle and be a bit rich but a 7.5 and down will be just fine. Last edited by Dodgem; 04/03/11 10:31 AM.

Re: I still have pinging problems with my 512 [Re: Dodgem] #964144 04/02/11 11:27 PM 04/02/11 11:27 PM
Joined: Jan 2003 Posts: 1,436 Oklahoma City OK Cudajon pro stock
Cudajon pro stock Joined: Jan 2003 Posts: 1,436 Oklahoma City OK	Trash the E85, its will cause an engine to lean out. You need to geta tank full of good gas and then get a O2 meter and see where your really at, one that can be wired up while your driving it. All this hit and miss stuff is chasing the problem. Do a real logical diagnosis. Im bettin you are way off on carb, timing and plugs. But you'll never find it if you just throw things at it. http://www.youtube.com/watch?v=4J3K94cRC1c

Re: I still have pinging problems with my 512 [Re: Cudajon] #964145 04/03/11 07:08 PM 04/03/11 07:08 PM
Joined: Jun 2009 Posts: 659 Boise Idaho B Boise Chall OP mopar
Boise Chall OP mopar B Joined: Jun 2009 Posts: 659 Boise Idaho	I just got the E85 Tainted fuel out of the car and I'm replacing it with Phillip 66 no corn fuel I also have a gallon of C-12 race fuel that I will add to the 5 gallons of pure no corn gas. I will get the plugs replaced with colder ones here shortly. I noticed that the heavy silver springs from my MSD distributor spring kit are still in the bag So I will most likely be putting those in as well as getting a cranking pressure

Re: I still have pinging problems with my 512 [Re: Boise Chall] #964146 04/03/11 07:12 PM 04/03/11 07:12 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: I just got the E85 Tainted fuel out of the car and I'm replacing it with Phillip 66 no corn fuel I also have a gallon of C-12 race fuel that I will add to the 5 gallons of pure no corn gas. I will get the plugs replaced with colder ones here shortly. I noticed that the heavy silver springs from my MSD distributor spring kit are still in the bag So I will most likely be putting those in as well as getting a cranking pressure You sound pumped live every 24 hour block of time like it's your last day on earth

Re: I still have pinging problems with my 512 [Re: RapidRobert] #964147 04/03/11 07:43 PM 04/03/11 07:43 PM
Joined: Jan 2003 Posts: 9,870 Weddington, N.C. Streetwize master
Streetwize master Joined: Jan 2003 Posts: 9,870 Weddington, N.C.	One trick that works well is to run between 18 and 22 degrees initial but then use a relatively slow curve that gives you full advance around 2800-3000, too light a spring gives you full advance at the crack of the throttle, they do that primarily for heaviier underpowered cars to give them some extra "oomph". With a 512 that is not a problem, if it's set up right and the combo is HAPPY, it should feel like a really strong horse that you need to pull back the reigns on most of the time. You can run zero deck closed chamber with an excellent quench pad and still run 11.4-12:1 in a 512, in fact I recommend it....but that would be a dished piston. A flat top will be over 13 at 512 with any typically sized 75 cc chamber. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: I still have pinging problems with my 512 [Re: RapidRobert] #964148 04/03/11 10:59 PM 04/03/11 10:59 PM
Joined: Jun 2009 Posts: 659 Boise Idaho B Boise Chall OP mopar
Boise Chall OP mopar B Joined: Jun 2009 Posts: 659 Boise Idaho	Ok guys my Cranking pressure is 160 I tested it with the motor cold I already have the heavy silver springs in the distributor. and the largest bushing to limit the advance. My plugs look good They have a little bit of black on the outer ring ( top of threaded area )the center is tan/borwnish. They are a little wet with fuel but that's probably because I didn't warm it all the way up when I put it away this morning.

Re: I still have pinging problems with my 512 [Re: Boise Chall] #964149 04/04/11 01:08 AM 04/04/11 01:08 AM
Joined: Oct 2009 Posts: 248 near St Petersburg, FL Lifsgrt enthusiast
Lifsgrt enthusiast Joined: Oct 2009 Posts: 248 near St Petersburg, FL	Are you running good plug wires, and have you checked them?

Re: I still have pinging problems with my 512 [Re: Lifsgrt] #964150 04/04/11 01:54 AM 04/04/11 01:54 AM
Joined: Jun 2009 Posts: 659 Boise Idaho B Boise Chall OP mopar
Boise Chall OP mopar B Joined: Jun 2009 Posts: 659 Boise Idaho	I'm running MSD super conductors they have less than 1,000 miles on them and they run under the headers so no place for them to get hot and they are well anchored so they don't rub on anything. I can check them if nothing else works out.

Re: I still have pinging problems with my 512 [Re: Boise Chall] #964151 04/04/11 02:34 AM 04/04/11 02:34 AM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	Can you see where the spark plug ground strap changes color? It is supposed to help tell if the ignition timing is good? It sounds like you covered most of the possible issues. I would drain as much of your current fuel from the tank, and put some 110 octane race gas in just to verify the engine will not ping with high octane fuel. Then I would chassis dyno the car using wideband O2 sensors, the see what your air/fuel ratios look like. Once you get the car in a known good state of tune, then I would reduce the fuel octane an see if the pinging returns.

Re: I still have pinging problems with my 512 [Re: 451Mopar] #964152 04/04/11 06:58 AM 04/04/11 06:58 AM
Joined: Nov 2004 Posts: 843 Suffolk,VA I ireland383 super stock
ireland383 super stock I Joined: Nov 2004 Posts: 843 Suffolk,VA	If the 110 don't work drop down to a RC9YC plug. How is your intake sealed? No leaks?

Re: I still have pinging problems with my 512 [Re: 451Mopar] #964153 04/04/11 09:49 AM 04/04/11 09:49 AM
Joined: Jun 2009 Posts: 659 Boise Idaho B Boise Chall OP mopar
Boise Chall OP mopar B Joined: Jun 2009 Posts: 659 Boise Idaho	451 you might be on to something there The color change on the strap is about 1/8 in from the threaded body of the plug saying way too much timing. I wonder if my dampner slipped on the hub or the timing/degree marks are wrong on it. It wouldn't be the first time that a slipping dampner had me second guessing myself and chasing gremlins. I will get the motor at TDC and see if it's TDC on the dampner. I've noticed it being a little hard for the starter to crank the motor when the the motor is warm/hot. If I remember right that says too much advance also.

Re: I still have pinging problems with my 512 [Re: Boise Chall] #964154 04/04/11 10:17 AM 04/04/11 10:17 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I tell you stick a 6.5 power valve in it and it will be way better under light throttle acceleration!! since you will always be pulling over 2.5 inches of vacuum at light acceleration you have no power enrichment system so it will be lean. Lean= ping Your cam is no where near big enough to run a 2.5 power valve you only need one to 1.5 number in gear above the power valve rating to keep it closed in gear idle. so 9 - 1.5 = 7.5 but a 6.5 will work good. Last edited by Dodgem; 04/04/11 10:19 AM.

Re: I still have pinging problems with my 512 [Re: Dodgem] #964155 04/04/11 01:21 PM 04/04/11 01:21 PM
Joined: Sep 2006 Posts: 616 TP Exit 7, NJ, USA DANA60 mopar
DANA60 mopar Joined: Sep 2006 Posts: 616 TP Exit 7, NJ, USA	I would add couple things: 1) The race gas thing is one way to check, but.. 2) I would also think that your power valve may be low. Lean on fuel can also cause ping. The two jet sizes won't mean anything with a wrong PV. 6567713-IMG_2836_1_1_1.JPG (29 downloads)

Re: I still have pinging problems with my 512 [Re: DANA60] #964156 04/04/11 05:39 PM 04/04/11 05:39 PM
Joined: Jun 2009 Posts: 659 Boise Idaho B Boise Chall OP mopar
Boise Chall OP mopar B Joined: Jun 2009 Posts: 659 Boise Idaho	Ok I put the Champion RC12YC plugs in I had RC14YC plugs in it previously. I put 6 gallons of no corn gas in it I' going to go take it for a ride and see how it does. My initial timing is at 16 with a total of 30 but it still cranks hard like the timing is too far advanced. Ill let you know how it does.

Re: I still have pinging problems with my 512 [Re: Boise Chall] #964157 04/04/11 05:49 PM 04/04/11 05:49 PM
Joined: Jan 2003 Posts: 74,942 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,942 U.S.S.A.	Quote: Ok I put the Champion RC12YC plugs in I had RC14YC plugs in it previously. I put 6 gallons of no corn gas in it I' going to go take it for a ride and see how it does. My initial timing is at 16 with a total of 30 but it still cranks hard like the timing is too far advanced. Ill let you know how it does. Your total timing should be higher than that ,it's going to be too hot in the chambers and you are going to end up with detonation more than likely... still . I thought you were going to confirm top dead center? I wouldn't be skipping steps because you are looking for a quick fix.

Re: I still have pinging problems with my 512 [Re: JohnRR] #964158 04/04/11 05:57 PM 04/04/11 05:57 PM
Joined: Jun 2009 Posts: 659 Boise Idaho B Boise Chall OP mopar
Boise Chall OP mopar B Joined: Jun 2009 Posts: 659 Boise Idaho	That's true I did skip that I will let it cool down a little and check my TDC

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