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PostPosted: Thu Oct 31, 2019 9:29 am 
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Better pic of 5 - 8, L to R. Also forgot to mention that any oil on the tips will be from the fogging oil I use when I shut the engine down.

Image

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PostPosted: Thu Oct 31, 2019 1:27 pm 
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Falcon67 wrote:
Anybody got an NGK part number for the BCP8 plugs. Not finding easy for some reason

Edit - NGK 3923 BPR8ES is what i found. That right?
EDIT AGAIN - can't be, B = 14mm 13/16 hex and BC is 14mm x 5/8, I don't think a 13/16 socket will fit these AFD heads.

Per NGK site "NGK BCR8ES Is Not Available In The US" - ???


https://www.amazon.com/NGK-Single-Spark ... B002W8JHN4


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PostPosted: Thu Oct 31, 2019 1:59 pm 
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Thanks - but not buying anything I can't get at Summit, Jegs or rockauto.com - NGK 5430 not listed at any of those locations.

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PostPosted: Thu Oct 31, 2019 2:21 pm 
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BCP7ES crosses to Autolite 3922. 14mm x 3/4 reach, 5/8 hex. Racing plug heat chart shows an AR3932 with AR3931 being one step colder. There is not a direct cross to the Autolite racing plug list. AR53 crosses to BP6ES, so an AR51 should be more-or-less equal in heat range to a 8ES. AR51 is a 14mm x 3/4 reach 13/16 hex and equal on the heat range chart to a AR3932 with a 5/8 hex. The 3922 is listed as "cold" on the Autolite heat range chart here , line 22:

https://www.autolite.com/pdf/heat_range.pdf

Wonder if that's a colder plug than the BCP7ES by the way Autolite makes it.

So I think a AR3932 will be worth a try, or possibly a AR3931. The 3931 is the absolute coldest in the 14mm x 3/4 x 5/8 list. See page 10: https://www.autolite.com/docs/default-s ... apps_0.pdf

Page 23 shows a cross from a NGK 8 to an 4251 or 4252. https://www.autolite.com/docs/default-s ... 0311_0.pdf

Also sent a message to AFD Dave on Facebook to see if he had a recommendation.

EDIT - haha, Summit wants $5.25 each for the AR3932, rockauto.com $2.67. Plus .75 per plug mail in rebate.

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Last edited by Falcon67 on Thu Oct 31, 2019 2:52 pm, edited 2 times in total.

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PostPosted: Thu Oct 31, 2019 2:34 pm 
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Dead plug on 5 or wet cylinder.

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PostPosted: Thu Oct 31, 2019 5:56 pm 
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It doesnt look like 5 is firing like the rest of them for sure.

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PostPosted: Thu Oct 31, 2019 7:34 pm 
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Lots of good replies here, my biggest issue is trying to read the lifecycle of the plugs after 100+ passes and commuting to the lanes and back. Brent has called it at it appears. There is signs of detonation with the peppering, and a bit too much timing but from when throughout these passes I cannot say. Looks like #5 has been out for a while judging by the rest (electrode and porcelain) but did run for a time.
I mostly change them between rounds and cut the threads off too. But I run nitrous and most of them you could run 100K after they are removed, some were done after the pass, hit a rev limiter on the juice and you will know what I mean. My point is find a way to check the tune on a pass before you leave them for a bunch of passes. As was mentioned you could change a couple at the end after shutting down and coasting out. Ideally warm up the engine and then change the plugs, then push it up and make a pass shut it down and change them on the end of the return you will need a few tools and some plugs in a bag buckled in for the ride. Worst case jackstands or a 60'-330' hit or make a pass and drive it back and wipe them off with brake cleaner, you will have a far better read from the beginning.

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PostPosted: Fri Nov 01, 2019 8:05 am 
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blykins wrote:
Dead plug on 5 or wet cylinder.


What about a head gasket? Would that wash away a plug like it does the chamber/piston top?


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PostPosted: Fri Nov 01, 2019 8:37 am 
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I'm hoping it's a gasket leak - but with it being a bit temperature regulated, may be worse. My thoughts also was that #5 was getting a wash or something. There have been no MPH changes not influenced by weather so I'm sure it's firing all cylinders. I'd not be running 125~126 on 7 with a little motor. The car has been losing a little water over the season that I mostly figured was ending up in the overflow tank and just going out the vent at speed or evaporating over a couple of months. If not that, whatever it was seemed to "let go" on Saturday.

I'll try to get it out of the car this weekend, but it's grandkids weekend so it may have to wait. The bench is covered with a 70cc quad motor for the pit bike and I've been trying to clean an exhaust seat with crude chinese tools. I may have to put that in a pile and just buy a new head for it. It's a 20mm valve with either a 45 or 30 degree seat. I only have a 45 degree ruff in and a 30 degree cutter, neither of which center/seat on the pilot LOL. Been a few hours of blue dykem, grinding compound and valve twisting with pliers.

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PostPosted: Fri Nov 01, 2019 3:39 pm 
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booyah45828 wrote:
blykins wrote:
Dead plug on 5 or wet cylinder.


What about a head gasket? Would that wash away a plug like it does the chamber/piston top?


Sure would. On a Cleveland, that's about the only way you'll get water in the cylinder, unless a cylinder is split or similar. Since the intake is dry, can't be sucking water in that way.

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