My 2017 setup.

[Canadianshee]

So a compression change should not effect the plug gap spec requirement. I guess what I'm trying to ask since I've installed 21cc dome my compression has increased over stock does the oem gap still apply, or should a different gap be used.
Its just a question after reading through this thread, I assumed that plugs come pre gapped, but checked 4 sets I had just now, not a single one was within spec (BR8ES type) from the dealer. Going to double check here on in.

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[ClaudeMachining]

Those ground straps are sexy

 

 

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[kawa110]

Head to frame? Cylinder base to frame?

[ClaudeMachining]

This is my engine/frame ground.


This one is the hotwire ground on the engine head


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[Canadianshee]

Should try to put double wall shrink wrap on to help keep it clean

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[Profilact]

On 7/26/2017 at 6:32 PM, ClaudeMachining said:

 

Dunno about power increase. The curves shifted for sure, i still have room for comp, will try 19cc and 18cc soon. I m at 155psi with 20cc and 100ll right now.

 

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Claude,

It sounds like you and I have very similar engines.  I started out my build running 100ll also.  I started with 20cc domes and it was too much compression for the octane rating of 100ll.  I was backing plugs out...

Just saying to be careful here.  I think I was at 180 psi with 100ll at the time.  I ended up going to 22cc domes for reliability and longevity.  I didnt miss the extra down low grunt from the switch all that much.

 

 

[ClaudeMachining]

2 hours ago, Profilact said:

Claude,

It sounds like you and I have very similar engines.  I started out my build running 100ll also.  I started with 20cc domes and it was too much compression for the octane rating of 100ll.  I was backing plugs out...

Just saying to be careful here.  I think I was at 180 psi with 100ll at the time.  I ended up going to 22cc domes for reliability and longevity.  I didnt miss the extra down low grunt from the switch all that much.

 

 

i  hear you, but 100ll can handle more than 155psi, that's where i am at.

;-)

[Ayesully810]

29 minutes ago, ClaudeMachining said:

i  hear you, but 100ll can handle more than 155psi, that's where i am at.

;-)

you also thought you were at plus 4 timing last year too lol

jk

[ClaudeMachining]

21 minutes ago, Ayesully810 said:

you also thought you were at plus 4 timing last year too lol

jk

lol, yeah that's a funny one

[87sheerips]

My old alky engine was SO picky on plug gap and a friend of mine called it out.  Tightened gap and I went from frustrated to wheelie madness.

[ClaudeMachining]

Dunno what happened, the engine is ok, no damage.



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[375hp banshees]

20 minutes ago, ClaudeMachining said:

Dunno what happened, the engine is ok, no damage.



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that sucks ...weak spot from bung weld?

[ClaudeMachining]

22 minutes ago, 375hp banshees said:

that sucks ...weak spot from bung weld?

Probably.

[ClaudeMachining]

Hope it will hold...


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[kawa110]

I hope you didn't pay for the weld job.

Word!!!