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Ttail
Joined: 24 Jun 2013
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hill(at)doctor-hill.com
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 Posted: Thu Sep 19, 2019 2:34 pm Post subject: M14P Auto plugs |
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Here's a better image for comparison. As you can see, the BPR6HS extends deeper into the combustion camber. For the lower cylinders, I believe that this may result in less oil fouling. These plugs are what I am using.
It’s my understanding that these plugs should only be used with stock M-14P pistons.
Warren Hill
N464TW
Mesa, AZ
[img]cid:7171A6A2-2A52-4A60-8A41-8F038E5F9FE2(at)Home[/img]
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dsavarese0812(at)bellsout
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| Posted: Thu Sep 19, 2019 3:07 pm Post subject: M14P Auto plugs |
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The BPR6HS plugs place the extended firing tip IN the combustion chamber rather than flush with the hemispherical head surface as the BR6HS and the original Russian and Chinese plugs are. Plus they put the tip of plugs in the lower cylinders just outside the normal oil drainage in those cylinders.
Lastly, the engine experiences more complete combustion.
Dennis
Sent from my iPhone
| Quote: | On Sep 19, 2019, at 6:15 PM, Ttail <ttail(at)internode.on.net> wrote:
I have always used the NGK BR6HS 3922 spark plug. A recent FB post says:
"Dennis now recommends the NGK BPR6HS that has a slightly extended electrode for his auto plug conversion kits. I switched to these with no issues. (M-14P)"
What is the advantage of the extended electrode as can be seen on the plug on the right ?
(https://postimages.org/)
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Ttail
Joined: 24 Jun 2013
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| Posted: Thu Sep 19, 2019 5:24 pm Post subject: Re: M14P Auto plugs |
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What is the situation with these plugs and Barret HC pistons ?
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k7wx
Joined: 24 May 2010
Posts: 117
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| Posted: Thu Sep 19, 2019 6:20 pm Post subject: M14P Auto plugs |
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You would have to ask them. If the Barrett HC pistons extend higher up into the combustion chamber, there could be serious problems.
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dsavarese0812(at)bellsout
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| Posted: Fri Sep 20, 2019 2:24 am Post subject: M14P Auto plugs |
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There is no "situation". The plugs work perfectly well regardless of what pistons are installed in the engine.
Dennis
On Thursday, September 19, 2019, 9:27:10 PM EDT, Ttail <ttail(at)internode.on.net> wrote:
--> Yak-List message posted by: "Ttail" <ttail(at)internode.on.net (ttail(at)internode.on.net)>
What the situation with these plugs and Barret HC pistons ?
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dsavarese0812(at)bellsout
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| Posted: Fri Sep 20, 2019 2:33 am Post subject: M14P Auto plugs |
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If you check what plugs Barrett is installing with their overhauls and HC pistons, you'll find that those plugs also have extended tips and obviously do not conflict with the pistons and neither do the BPR6HS plugs.
The firing tips of these plugs only extend beyond the surface of the hemispherical combustion chamber surface about 1/8"- 3/16". You can be assured there are no pistons used in the M14 that even come close to the plug tips.
Dennis
On Thursday, September 19, 2019, 10:22:52 PM EDT, Warren Hill <k7wx(at)earthlink.net> wrote:
--> Yak-List message posted by: Warren Hill <k7wx(at)earthlink.net (k7wx(at)earthlink.net)>
You would have to ask them. If the Barrett HC pistons extend higher up into the combustion chamber, there could be serious problems.
| Quote: | What the situation with these plugs and Barret HC pistons ?
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Ttail
Joined: 24 Jun 2013
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| Posted: Fri Sep 20, 2019 4:45 pm Post subject: Re: M14P Auto plugs |
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Thanks Dennis.
Does that still apply if the M14PF is in fact based on a M14B ? ... so its an M14B-PF with Barrett HC pistons
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