Author Topic: D8EA vs D8ES ? (Read 35435 times)

Magpie · « **on:** October 04, 2010, 07:53:58 AM »

What 's the difference between D8EA and D8ES? Does one run hotter of have a hotter spark? Does one foul less?
Thanks,
Cliff.

bryanj · « **Reply #1 on:** October 04, 2010, 07:55:54 AM »

Same plug, newer nomenclature

Deltarider · « **Reply #2 on:** October 04, 2010, 08:29:09 AM »

Good question. Is the new D8EA the old D8ES or D8ES-L?

Spanner 1 · « **Reply #3 on:** October 04, 2010, 08:37:55 AM »

S is for 'short' and L is for 'long' versions of the plug, as far as I know.......

Brown Bomber · « **Reply #4 on:** October 04, 2010, 08:55:48 AM »

Here's a link to a Spark Plug and Cap guide on Z1 Ent.
http://www.z1enterprises.com/reference/Z1-spark-plug-guide.aspx

Bodi · « **Reply #5 on:** October 04, 2010, 04:03:07 PM »

But there's a D8-ESL...

Brown Bomber · « **Reply #6 on:** October 04, 2010, 07:46:44 PM »

Quote from: Bodi on October 04, 2010, 04:03:07 PM

But there's a D8-ESL...

Yeah, that's on the chart;
D= 12mm thread dia.
8= 0.8mm wide gap
ES= Standard 3/4" thread reach [2.5mm] center electrode
L= half heat range

Hondawggie · « **Reply #7 on:** October 04, 2010, 08:24:39 PM »

About 3 days ago I had to visit 3 different auto/bike shops to find plugs to fit my stock 1972 cb750. I fully intended on buying 4 new NGK D8es plugs.

Not even the motorcycle shop had D8ES plugs. In fact, all 3 stores had a hard time even finding an NGK plug called 'D8es' and all three told me the same thing, "The D8es has been replaced by the D8ea."

My '72 runs great now with the D8ea's. The first two stores (Kragen Auto and Napa) did not even have the 'D8ea' plugs that replaced the D8ea's -- only the motorcycle shop carried them.
So availability for these guys is not great. If they were still being used in metric cars, those 2 auto parts places, which are huge corporations, would have carried them.

Looking for plugs for my '72 a couple days ago reminded me of the years in the 1970/80s when finding replacement tubes for guitar amplifiers got dicey. Guitar players were buying imported guitar amp tubes that were made in Russia and other commie countries who were behind in technology back then.

ekpent · « **Reply #8 on:** October 05, 2010, 05:04:56 AM »

I find that Autozone in my area has a good selection of NGK plugs available at $1.99 each.

Magpie · « **Reply #9 on:** October 05, 2010, 07:34:15 AM »

Good price! DR8ES at $4.99 each yesterday. The bike likes them though.
Cliff.

JS550 · « **Reply #10 on:** October 05, 2010, 07:52:21 AM »

SPARKPLUGS.com is a good source, if you dont mind waiting. I've been running Densos since spring & they seem to be good.

Duanob · « **Reply #11 on:** October 05, 2010, 10:43:03 AM »

Quote from: Magpie on October 05, 2010, 07:34:15 AM

Good price! DR8ES at $4.99 each yesterday. The bike likes them though.
Cliff.

Wow they really tax the heck out of you up in BC, eh? I just bought a set at Carquest in Seattle for $2.30 each. They also stck the D7s as well.

nancy · « **Reply #12 on:** October 05, 2010, 02:52:29 PM »

Same here in NZ,..NGK plugs for my bike are available from any auto parts supplier. Just bought a 4-pack for NZ$14. No need to go to motorcycle shop and they are likely to carry stock for more recent models anyway.
My previous set of NGK I bought from a bike shop - NZ$25.

Mark

HondaMan · « **Reply #13 on:** October 05, 2010, 09:26:30 PM »

The D8ES was a "Super-wide heat range" sparkplug. The EPA made NGK discontinue these in the early 1990s. Their replacement was the D8EA, a colder plug by about 1/4 heat range step.

The D8ES-L (now defunct, except in the resistor version DR8ES-L) has a Longer tip (i.e., Extended Tip) to help burn off deposits.

The superior plug is the Nippon Denso X24ES-U, which is a little hotter than the D8EA and ideal for the CB750, especially with alcohol-laced fuels. It has an even more extended tip, with a smaller ceramic nose, which was designed expressly for the CB750, circa 1974.

mick7504 · « **Reply #14 on:** October 05, 2010, 09:34:50 PM »

Sorry for the hijack.
Are there any opinions about the NGK Iridium plugs or is it just best to stick with the devil we know?
Mick

Dennis · « **Reply #15 on:** October 06, 2010, 12:21:19 AM »

Quote from: HondaMan on October 05, 2010, 09:26:30 PM

The D8ES was a "Super-wide heat range" sparkplug. The EPA made NGK discontinue these in the early 1990s. Their replacement was the D8EA, a colder plug by about 1/4 heat range step.

The D8ES-L (now defunct, except in the resistor version DR8ES-L) has a Longer tip (i.e., Extended Tip) to help burn off deposits.

The superior plug is the Nippon Denso X24ES-U, which is a little hotter than the D8EA and idea for the CB750, especially with alcohol-laced fuels. It has an even more extended tip, with a smaller ceramic nose, which was designed expressly for the CB750, circa 1974.

Would that ND X24ES-U recommendation also include the '75-'76 CB750F type engines?

So what would be your suggestion as the best available plug for a CB500 or 550?

Thanks ...........

HondaMan · « **Reply #16 on:** October 06, 2010, 04:55:17 PM »

Quote from: Dennis on October 06, 2010, 12:21:19 AM

Quote from: HondaMan on October 05, 2010, 09:26:30 PM
The D8ES was a "Super-wide heat range" sparkplug. The EPA made NGK discontinue these in the early 1990s. Their replacement was the D8EA, a colder plug by about 1/4 heat range step.

The D8ES-L (now defunct, except in the resistor version DR8ES-L) has a Longer tip (i.e., Extended Tip) to help burn off deposits.

The superior plug is the Nippon Denso X24ES-U, which is a little hotter than the D8EA and idea for the CB750, especially with alcohol-laced fuels. It has an even more extended tip, with a smaller ceramic nose, which was designed expressly for the CB750, circa 1974.

Would that ND X24ES-U recommendation also include the '75-'76 CB750F type engines?

So what would be your suggestion as the best available plug for a CB500 or 550?

Thanks ...........

Yep, that's for all the 750 SOHC4 engines. And, for CB500/550 when on long, fast tours on the Interstates.
The standard plug for the CB500/550 is the ND X22ES-U, similar setup with the X24.

nancy · « **Reply #17 on:** October 06, 2010, 07:06:32 PM »

I have just fitted DR8ESR's....resistor type..but not long...

Dennis · « **Reply #18 on:** October 12, 2010, 06:23:39 AM »

Thanks Mark.

Some of the details you know about these bikes is just amazing.

jessezm · « **Reply #19 on:** October 12, 2010, 06:46:43 AM »

Mark, could you comment on the use of the Denso plugs in a mildly hopped-up CB400f? I'm currently running the X24s you recommended for the CB750. I've only got 100 miles on my fresh top-end and haven't done any real tuning yet, but my plugs so far are almost completely carbon-free, just a slight bit of darkening if any. But I see you recommend a different plug (X22) for the CB500/550...

Deltarider · « **Reply #20 on:** October 12, 2010, 07:56:50 AM »

Quote

But I see you recommend a different plug (X22) for the CB500/550...

In Europe for the 500/550 series the X22 or D7ES were considered suitable plugs for break-in period and if you used your bike for short rides and around town only. After break-in most owners overhere switched to D8ES-L or X24ES-U (higher speeds maintained for longer periods). In a 400 I would not run another plug than the D8ES-L or X24ES-U.

jessezm · « **Reply #21 on:** October 12, 2010, 07:58:29 AM »

Awesome, thanks!

TwoTired · « **Reply #22 on:** October 12, 2010, 08:31:34 AM »

I absolutely hated D8 plugs in my 550's. Very cold blooded beast it made, too.

I will say that if I planed on driving at top speed through the hot desert, I'd use D8.
But, for all other street driving, D7 keeps the engine civil and happy. Didn't matter how long a drive it had to undergo.

I did try the Denso x24es-u on my 77 CB550F. I didn't notice any difference in the way the engine ran 'til after about 3000 miles. Then one of the plugs became intermittent/or fouled. All attempts to clean it failed. So, I replaced them all with NGK D7ES, and it's been fine ever since.

Cheers,

Deltarider · « **Reply #23 on:** October 12, 2010, 09:05:37 AM »

The D8ES-L was/is in between the D8ES and the D7ES and as soon as they appeared on the market were officially prescribed for instance by Honda France as being auto-nettoyantes (self-cleaning). I've always found them excellent plug and I felt safe with them on long hauls at high speed.
Cold-bloodiness in this part of the world has nothing to do with plugs heatrange.

TwoTired · « **Reply #24 on:** October 12, 2010, 10:04:59 AM »

Quote from: Deltarider on October 12, 2010, 09:05:37 AM

Cold-bloodiness in this part of the world has nothing to do with plugs heatrange.

Gotta vehemently disagree with this statement. The CB550 was un-rideable with D8 until after a ten minute warm up.
Simple change to D7 and you could start and go with a bit of choke on, no matter how cold it was.
Plug heat range most definitely matters.

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Author Topic: D8EA vs D8ES ? (Read 35435 times)