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#1 Old 10-04-2012, 04:37 AM
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Denso IK20 intervals

When to change these?

I had them installed around

135,000kms

now 190,000kms

I guess these last 100,000kms?

No misfires and high mpgs.

1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

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#2 Old 10-04-2012, 08:36 PM
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I'd pull and inspect the plugs now.

Denso's iridiums have a thinner center electrodes than NGKs. NGK Iridium-IX can go 60-75K miles (96-120K km) without problems. The wear will be on the ground electrode as the softer metal erodes away. NGK Laser Iriduims have platinum ground pads that just about eliminate this wear. (Toyota spec them 120K miles/193K km).

I would check the Denso at 30K miles (48K km) and decide from there, and see if you can run them for 45K miles (72K km). I don't think they'll last as long as NGKs.

Apply a small dab of spark plug antiseize 3 threads away from the tip when you reinstall. Use a torque wrench to 13 lb/ft (18 Nm).

Your plugs may go more, but Denso actually recommends 30K mile (48K km) replacement.
http://www.densoiridium.com/faq.php
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#3 Old 10-05-2012, 07:25 AM
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The IK20s are high performance iridium plugs with a small 0.4mm electrode. Denso rates these at 60k miles.

However, before I knew this, I ran them in my mom's 2000 Camry 5SFE and they lasted 120k miles in a wasted spark setup. Guess what happened? The ground electrode wore down to almost nothing but the iridium electrode still looked brand new. These plugs, then, are ground electrode limited.

If you want a longer lasting Denso iridium plug, look into the SK20R11; these have a 0.7mm iridium tip with a platinum ground. Unfortunately, Denso doesn't make the twin tip FK20HR11 for non-long reach engines.

1991 Toyota MR2 V6
Ported, rebuilt MY2000 3.0L 1MZ
Fully OBDII compliant and California smog legal
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#4 Old 10-07-2012, 08:55 AM
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Quote:
Originally Posted by Jason.MZW20 View Post
The IK20s are high performance iridium plugs with a small 0.4mm electrode. Denso rates these at 60k miles.

However, before I knew this, I ran them in my mom's 2000 Camry 5SFE and they lasted 120k miles in a wasted spark setup. Guess what happened? The ground electrode wore down to almost nothing but the iridium electrode still looked brand new. These plugs, then, are ground electrode limited.

If you want a longer lasting Denso iridium plug, look into the SK20R11; these have a 0.7mm iridium tip with a platinum ground. Unfortunately, Denso doesn't make the twin tip FK20HR11 for non-long reach engines.
May I see those plugs at 120,000mls intervals?

What do you mean with a wasted spark setup?

Mine look like this now:


1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

Green racing air filter

Km/h and MPH dual speedometer

Shell Helix Ultra Racing 10w60 SN/CF

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#5 Old 10-07-2012, 02:14 PM
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That's a good bit of deposit at about 34K miles. Usually at this mileage the iridium plugs would look almost new. I've seen 100K+ plain platinum plugs that looked better. Looking at the gasket - it's a bit hard to tell but is it still round? Was it torqued to 18 lb/ft (dry) or 13 lb/ft with a dab an antiseize? Because with NGK gaskets they would look flat, almost like two flat washers stacked together.

Yeah, it's time to change these plugs, but I'd want to find out why the plugs look so worn at this km/mileage.

A waste-spark system is an old design that manufacturers use to save on extra coils. 2 cylinders are paired together and their plugs fired at the same time. Since one cylinder will be on the combustion cycle and the other on exhaust, the spark in the exhaust cylinder is therefore "wasted". Plugs worked twice as hard in the waste-spark system. The system worked, but manufacturers have since moved away from it. Maybe only to claim a longer plug change interval? Or does the wasted spark lowered the spark energy in the primary cylinder? Dunno.
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#6 Old 10-07-2012, 02:23 PM
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Quote:
Originally Posted by JohnGD View Post
That's a good bit of deposit at about 34K miles. Usually at this mileage the iridium plugs would look almost new. I've seen 100K+ plain platinum plugs that looked better. Looking at the gasket - it's a bit hard to tell but is it still round? Was it torqued to 18 lb/ft (dry) or 13 lb/ft with a dab an antiseize?

Yeah, it's time to change these plugs, but I'd want to find out why the plugs look so worn at this km/mileage.

A waste-spark system is an old design that manufacturers use to save on extra coils. 2 cylinders are paired together and their plugs fired at the same time. Since one cylinder will be on the combustion cycle, the other on exhaust. The spark in the exhaust cylinder is therefore "wasted" and plugs worked twice as hard - therefore "waste-spark" system. The system worked, but manufacturers have since moved away from it. Maybe to claim a longer plug change interval? Dunno.
The tip is not off. Was the same as I checked at 150,000km. Nothing changed till now tip and gap still same. I would stay a while with these till 230,000 km.

These are the IK20 0.4mm and can last only 30,000km they say.

Maybe next time try IK22? These look too hot to me (Temp range 5).

1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

Green racing air filter

Km/h and MPH dual speedometer

Shell Helix Ultra Racing 10w60 SN/CF


Last edited by camry_RHD; 10-07-2012 at 02:49 PM.
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#7 Old 10-07-2012, 02:44 PM
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Or maybe give NGK Iridium-IX or Laser Iridium a try.
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#8 Old 10-07-2012, 02:47 PM
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Originally Posted by JohnGD View Post
Or maybe give NGK Iridium-IX or Laser Iridium a try.
Is Denso IK22 possible to have in a 5SFE NA?

Or do I need the same one aka IK20?

1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

Green racing air filter

Km/h and MPH dual speedometer

Shell Helix Ultra Racing 10w60 SN/CF

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#9 Old 10-07-2012, 03:04 PM
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I don't know enough about changing heat ranges, but for turbo some may use a cooler plug. Maybe others can chime in here.
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#10 Old 10-07-2012, 03:09 PM
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Quote:
Originally Posted by JohnGD View Post
I don't know enough about changing heat ranges, but for turbo some may use a cooler plug. Maybe others can chime in here.
Just one heat range higher can't really affect engine operation I guess.

Will be trying IK22 and see what happens.

1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

Green racing air filter

Km/h and MPH dual speedometer

Shell Helix Ultra Racing 10w60 SN/CF

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#11 Old 10-08-2012, 03:23 AM
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Quote:
Originally Posted by camry_RHD View Post
Just one heat range higher can't really affect engine operation I guess.

Will be trying IK22 and see what happens.
I beg to differ.

Changing heat ranges adds/removes 70-100*C from the combustion chamber for each heat range. 1-step colder will remove 70-100*C, which is equivalent to 10* of ignition retard.

I fail smog with the 1MZ's stock heat range. I pass smog with 1-step hotter plugs. The hotter plugs cut HCs (unburned fuel) roughly in half (108ppm to 53ppm; passing is 54ppm). The CA ECU I have runs richer during the 15mph test because it expects pre-catalysts (don't have them) and uses the fuel to keep them hot.

If the porcelain were WHITE, the plug would be too hot. It looks fine (pink to dark pink is good). The rest of the deposits can be from poor fuel quality.

Quote:
Originally Posted by camry_RHD
May I see those plugs at 120,000mls intervals?

What do you mean with a wasted spark setup?
I hope I still have them. If I don't, just imagine the tip of the ground electrode completely worn down. I had to push the ground electrode inward and down toward the tip to reduce the gap and prevent misfires while I waited for the SK20R11s.

Wasted spark is the type of direct ignition system the 1997-2001 5SFE uses. It pairs cylinders 1-4 and 2-3 on the same coil/igniter assembly (2-wires are attached to each coil/igniter). So when cylinder 1 fires in the power stroke, cylinder 4 also fires (very weakly) in the exhaust stroke. That's the basic premise.

1991 Toyota MR2 V6
Ported, rebuilt MY2000 3.0L 1MZ
Fully OBDII compliant and California smog legal

Last edited by Jason.MZW20; 10-08-2012 at 03:24 AM.
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#12 Old 10-08-2012, 07:46 AM
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Quote:
Originally Posted by Jason.MZW20 View Post
I beg to differ.

Changing heat ranges adds/removes 70-100*C from the combustion chamber for each heat range. 1-step colder will remove 70-100*C, which is equivalent to 10* of ignition retard.

I fail smog with the 1MZ's stock heat range. I pass smog with 1-step hotter plugs. The hotter plugs cut HCs (unburned fuel) roughly in half (108ppm to 53ppm; passing is 54ppm). The CA ECU I have runs richer during the 15mph test because it expects pre-catalysts (don't have them) and uses the fuel to keep them hot.

If the porcelain were WHITE, the plug would be too hot. It looks fine (pink to dark pink is good). The rest of the deposits can be from poor fuel quality.



I hope I still have them. If I don't, just imagine the tip of the ground electrode completely worn down. I had to push the ground electrode inward and down toward the tip to reduce the gap and prevent misfires while I waited for the SK20R11s.

Wasted spark is the type of direct ignition system the 1997-2001 5SFE uses. It pairs cylinders 1-4 and 2-3 on the same coil/igniter assembly (2-wires are attached to each coil/igniter). So when cylinder 1 fires in the power stroke, cylinder 4 also fires (very weakly) in the exhaust stroke. That's the basic premise.
Thanks will try IK22 on this car.

1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

Green racing air filter

Km/h and MPH dual speedometer

Shell Helix Ultra Racing 10w60 SN/CF

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#13 Old 10-08-2012, 09:55 PM
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Quote:
Originally Posted by camry_RHD View Post
Thanks will try IK22 on this car.
Why? The stock heat range is fine. You'll lose power with the IK22s because the 5SFE ECU doesn't have aggressive ignition timing maps.

1991 Toyota MR2 V6
Ported, rebuilt MY2000 3.0L 1MZ
Fully OBDII compliant and California smog legal
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#14 Old 10-09-2012, 01:31 AM
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Why? The stock heat range is fine. You'll lose power with the IK22s because the 5SFE ECU doesn't have aggressive ignition timing maps.
For me those plugs look fine because after 10,000km of use still same colour and wear as now 60,000km later.

Next time IK20 then.

1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

Green racing air filter

Km/h and MPH dual speedometer

Shell Helix Ultra Racing 10w60 SN/CF

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#15 Old 11-01-2012, 11:39 AM
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Jason btw I have been running 94 octane (98 RON only since I bought it).

1997 3Gen Toyota Camry 5SFE

Denso IK20 Iridium 0.4mm

Green racing air filter

Km/h and MPH dual speedometer

Shell Helix Ultra Racing 10w60 SN/CF

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