View Full Version : New Bosch Plugs
04-10-2004, 07:16 PM
Has anyone tried the new Bosch Platinum spark plugs? They look like an aircraft plug.
Roto Hawk Falcon I
04-10-2004, 07:19 PM
Gaylon, I've been using them in my EJ-22 for several years. I've had no problems with them at all. If we're talking about the ones with the 3 prongs, are pregapped and cost about 5 or 6 bucks each, they've been around awhile. Think they may have come out with something new recently?
04-10-2004, 08:43 PM
Ken, I think they have 1 , 2 ,& 4 "prong" versions. I can't find them for my EA-81. What model & # are you using in your EJ-22? Where did you get them?
04-10-2004, 10:06 PM
Chris, maybe I got the 4 prong. When I bought them about a year ago, they were the most expensive ones they had. I'll have to check which ones they are the next time I'm at the hangar. Now that I think of it, I believe they are 4-pronged. :confused: I got them at Pep Boys. All I told them was what year "Subaru" and engine I was driving and they looked them up.
I'm back. Here's Bosch's website on the 4-prongers. They're not new. Been around awhile. Someone else asked about them on a Soob Forum. Said they looked like "aircraft plugs." Wait. That must have been you, Gaylon. To make a long story short, in my experience, they are excellent plugs.
04-11-2004, 01:02 AM
Thanks for the website Ken! I got a coupon for $10 from it. Those Dodo's at Autozone told me they were not available for my "car". From the website , it looks like they are made for just about everything! Spark is very important in an internal combustion engine, I'm told ! I don't mind spending more money for the best plugs I can get. They say I will get better gas mileage also. I was dissapointed when they told me they were unavailable but this time I know the truth. I will get them now! Thanks Ken
04-11-2004, 05:35 AM
has someone tried those ones?
04-11-2004, 02:00 PM
Hi Andre Looks to me like a glow plug in a precombustion chamber.While I am sure it will work I'm not so sure of long term inthat it will fire the cylinder well in advance of manufacturers spec.If that is the case it will have a lose in power,rough idleing and fuel knock like a deaselI think I would have too see it too beleave it :eek:
04-11-2004, 07:26 PM
Ken, that was me on the Sub list. When I said it looked like an aircraft plug, I was referring to the electrode, not the shielded insulator. I think some people misunderstood what I was meaning on the sub list. I'm glad to hear that they work good. It seemed like a very solid design. However most people don't like the split fire plugs after using them, so I figured it prudent to ask :) I just learned about them about two weeks ago, wich in my little town is no surprise. Our theater is supposed to be showing Gone with the Wind next week :p
04-11-2004, 08:12 PM
Hi Gaylon, I knew what you meant. I was recalling the 3-pronged plugs that I used to use when I had Ercoupes. I'll be danged if I can remember the brand right now.
05-02-2004, 09:26 AM
Addendum to the Bosch Platinum-Plus 4 plugs: I spent 6 hours on Friday trying to trouble-shoot a suddenly rough-running engine. I did a runway flight and only got 4,500 at full-throttle instead of 5,000. I had just installed the fuel-flow meter from Airflow Performance (pics in a new thread, coming soon), replacing the simpler distribution block. These are the units that send the fuel to the injectors after receiving it from the throttle-body. I figured it had something to do with the upgrade.
Don at Airflow wasn't much help. He said that without an EGT on each of the 4 pipes, he couldn't help much. Right....a gyro with an auto engine with 4 EGT sensors. I re-jetted the throttle-body about 5 times with different jets, I did a flow-test on each injector line, I cleaned all the injectors, I made a new plug-wire and replaced each one, one-by-one and whatever else I could think of.
At about 10 minutes short of 6 hours, I decided to look at the plugs. 3 were sooty from idling and 1 was clean as a whistle. I wondered why that one wasn't sooty too. It's because it was dead. I found an old plug in the hangar and started her up. She was back to her usual sewing-machine motor smoothness. I'm guessing 100 hours tops on the plugs. I haven't looked in my logbook yet. That's p-poor durability. Now, when I mentioned it around, all the airport rats start saying: "Oh yeah. I heard there were problems with those plugs." I never heard that. Take it for what it's worth.
05-02-2004, 03:35 PM
But I had problems yesterday as well. One mile from the airport after take off and a rough running engine. Only 3 cyliders. I was able to get back to the airport. Had a look at the plugs, one seemed a little rich. This is a new engine out of the Subaru factory with 70 hours on it. Seeing as I was running my older manifold and plug leads I put some new plug leads on. Start up and ran smooth, but by the time we taxiid to the holding point she is only on three and worse that ever. Had to taxi back.
Ifound and old plug and replaced the one that looked a bit more sooty and off we went for an hours training. Number one plug was breaking down.
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