Spark plug for my 4AGTE

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Spark plug for my 4AGTE

Postby Vertigo » Thu May 10, 2018 8:36 am

Hi guys. Been running BCPR6EIX-11 iridium tip with the factory distributor without issue. Now that Im going with 3SGE coil on plugs, will I need to change to something else?
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Re: Spark plug for my 4AGTE

Postby GDII » Thu May 10, 2018 9:04 am

The BEAMS 3SGE runs BKR6EP11 plugs standard.
The 3SGTE uses BKR6EP-8 plugs standard.

The gap on the plugs you have is quite large for a boosted engine. 1.1mm vs 0.8mm.

I guess you'd only need to change if you are getting misfires and it's down to the plugs.
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Re: Spark plug for my 4AGTE

Postby Vertigo » Thu May 10, 2018 9:13 am

Its a weird issue. Im running them in wasted spark config. Testing each cylinder independently, they all fire ok. Testing each wasted spark pair, the engine runs on two cylinders fine. But on all four, its like its running on three. Just wanted to check if my plugs might be the issue, but if it runs well on two cylinders, I doubt thats the case.
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Re: Spark plug for my 4AGTE

Postby Dell'Orto » Thu May 10, 2018 5:07 pm

Try a set of copper plugs gapped down to test it.
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Re: Spark plug for my 4AGTE

Postby jondee86 » Sat May 12, 2018 2:12 pm

Vertigo wrote:Its a weird issue. Im running them in wasted spark config.

How/why are you running them wasted spark ?

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Re: Spark plug for my 4AGTE

Postby Vertigo » Mon May 14, 2018 8:14 am

I sent the Megasquirt down to have its four ignition outputs upgraded, and it came back with two. Sigh. Its gone back down now to be fixed, after I complained about it.

Just wired each trigger wires together with two coil trigger wires (1-4, 2-3).
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Re: Spark plug for my 4AGTE

Postby jondee86 » Mon May 14, 2018 12:34 pm

The conditions inside the combustion chamber have not changed just because
you have changed the ignition system (so long as they are "dumb" COP's). The
spark plugs will not know any different if they are getting the same spark energy
at the gap. If the gap was too wide you might expect some breakdown at high
rpm/load but not at idle.

What you wired up should work. If each pair of cylinders will run without missing,
but there is a problem when both pairs are run at the same time, there could be
a bad join somewhere in the circuitry. If so, you would expect the "missing" to
become worse as the rpms go up.

Full sequential should get it sorted :)

Cheers... jondee86

PS: The AW11 s/c FSM specifies NGK BCPR6EP11 for a stock 8psi engine. I tend
to agree that 0.80mm gap is preferable when you up the boost to 15psi or higher.
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Re: Spark plug for my 4AGTE

Postby Vertigo » Mon May 14, 2018 1:28 pm

Great, thanks for the info. As an aside, while 3SGE coils seem to work, they are a little short, so I might go with 2NZFE coils, as they are longer.
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Re: Spark plug for my 4AGTE

Postby Vertigo » Mon Jun 18, 2018 10:11 am

Got some 1SZ-FE coils now. A bit taller, same connector and pinout, and give great spark with the BCPR6EIX-11 plugs.
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