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#1
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timing on plug ground strap
I read that the heat line on the ground strap should be at the bend. Mine is a little closer to the base. It runs great. Do you think I should take a tad of timing out. I forgot what I set it at but I think it was 38. E-heads with 12-1 compression.
Last night I ran 6.30 with a 1.340 60' |
#2
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Taking timing out will move the color closer to the base.
When we ran the Grocery Getter, the nitrous experts recommended tuning the timing to put the color at the bend. We beat up a lot of pistons following that advice. Then started retarding the timing and every bit that we took out made it faster and easier on pistons. When the pistons were happy, the color was at the base of the ground strap. FWIW: Eric
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"Everybody has a plan until they get punched in the mouth" noted philosopher Mike Tyson Life begins at the end of your comfort zone. “The mind, once stretched by a new idea, never returns to its original dimensions.” |
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#3
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Quote:
I have seen a several boosted engines make excellent power with less that 10 degrees of timing at max boost and max rpm. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#4
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I would take 2 to 3 out .
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#5
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If that color change over point was not made by just full throttle runs and then shutting the motor down then you need one step colder plug, but even if it was the heat range looks like it’s on the edge of too hot to me.
One things for sure buying and testing another set of plugs is a heck of a lot cheaper then the cost of pounded out rod bearings!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#6
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The bend is for heat range of plug.
Timing is taken from the base of the bend. The whole circle of the flat part.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#7
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Quote:
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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#8
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Nice looking plug. Maybe take out a couple degree. How does the fuel ring look down below...lol. Cut one apart and take a looksie.
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#9
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x2 here
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#10
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As mentioned, I'd take a new 3923 and 3922(or NGK equivalent as I like them better) and make a clean run to check heat range. It looks a little hot. (if you get the same heat mark on a new plug) I'd make a guess(though an educated one) the 3922 will be appropriate in a 12:1 engine. Once the heat range is verified, timing by power numbers(appropriate fuel is assumed)
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'65 Tempest 467 3650# 11.30@120.31 |
#11
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With night time runs the humidity usually soar’s and can make for your jetting looking fatter and allow you to run more timing then you could during mid day runs for example.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#12
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Good info in this video from Steve Morris about reading plugs
https://www.facebook.com/watch/?ref=...59749171308412 |
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#13
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Quote:
Retarding the timing reduces the temperature in the chamber and causes less cooking of the groundstrap; so the color band moves out toward the tip. The base of the strap sinks heat into the metal shell and stays cooler. Grocery Getter ran best with almost no "blue" on the ground strap. Sorry for the confusion... Eric
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"Everybody has a plan until they get punched in the mouth" noted philosopher Mike Tyson Life begins at the end of your comfort zone. “The mind, once stretched by a new idea, never returns to its original dimensions.” |
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