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spark plug color

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shierh View Drop Down
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    Posted: March-20-2018 at 8:51pm
Carbureted 351w
how even are your insulator color over the 8 plugs
Mine vary, fact is I have one that's way too clean. very puzzled on that.   
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KENO View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 6:37am
How clean is way too clean?

Perfect time for pictures would be right about now.

Is the plug firing at all or is it looking like new?

It could be that you have water leaking into that cylinder and you're steam cleaning that plug while the engine is running.

Some variation is normal but this sounds like one is a whole lot different.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SNobsessed Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 7:50am
I had valve stem seals that were cracked & leaking, causing some plug fouling. Wasn't using enough oil to notice otherwise. Replaced seals with heads on.

Now all plugs stay off-white.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shierh Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 8:21am
75 hours on this engine rebuild.   Everything was new.   

I will verify if plug is firing and also stick a camera in the cyl and look at piston and see if its being steam cleaned.    
Wire set came from Skidim.   Plugs are NGK BPR6FS.   I checked gap and they were smaller than 035 so I re gapped all of them.

Engine does seem a little rough at slow speeds lately, Seems to run up properly though.   This could be sign of water I would guess.   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GottaSki Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 9:14am
To answer your question, all mine are even, and clean.

How is your PVC Plumbed? To just one runner, or to the carb, or spacer plate?
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shierh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shierh Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 9:58am
PVC goes to base plate.   

I didn't replace the PVC when I rebuilt engine, only cleaned it out with brake parts cleaner.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JoeinNY Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 10:04am
Originally posted by shierh shierh wrote:

75 hours on this engine rebuild.   Everything was new.   

I will    


Does everything include the exhaust manifolds? Super clean and rough at idle could certainly be a slow drip down a manifold runner...
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shierh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shierh Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 10:55am
New manifolds and risers.   Heads were replaced with used ones and magnafluxed.
New head bolts, arp. Marine head gaskets.   Fact the only remaining original component is the distributor. Engine was built properly however failure can happen.   Think riser gasket could be an issue.   Have seen some signs of external leaking on both sides.

Will get new riser gasktets and bolts just to rule this out.   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shierh Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 1:09pm
its cyl #6 which is at the forward edge of the center riser.   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shierh Quote  Post ReplyReply Direct Link To This Post Posted: March-21-2018 at 9:15pm
Bore Scoped all 4 on left side. all have rust speckles on upper cylinder walls.   pulled riser and did find some evidence of a water leak.   I believe this is the culprit. Honed surfaces and getting gaskets tomorrow after work.   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shierh Quote  Post ReplyReply Direct Link To This Post Posted: March-22-2018 at 1:45pm


Im on a fence post with this
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: March-22-2018 at 6:34pm
I think the logical thing to do is spend about 20 or so on new plugs after you're done with the gasket replacement and check them pretty frequently.to see what's happening.
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Duane in Indy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Duane in Indy Quote  Post ReplyReply Direct Link To This Post Posted: March-22-2018 at 6:38pm
It's a shame that it is so difficult to check EGT (exhaust gas temp) as it would tell a lot at all RPM's. I watch mine in my airplane continually
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: March-23-2018 at 12:32pm
Use a hand held temp gun. I have a fluke that does a great job.
I bought it after watching a friend use his while running a dyno test.
They give you instant temp reads, as fast as taking a picture.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shierh Quote  Post ReplyReply Direct Link To This Post Posted: March-26-2018 at 12:37pm
I ordered plugs last week.   I do have an ir gun, Will try that next time.

Right now my number 1 plug is too clean and my number 6 is way too clean, at least compared to other plugs.   
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