Honda spark!

[GregPeluso]

How often should the plugs be changed?
How often should coil packs be replaced?

thanks
greg

[problemchild]

How often shock the plugs be changed?
How often should coil packs be replaced?

thanks
greg

Plugs. After the engine gets cooked due to an external cooling system failure. Plugs come with new engine.
Coil packs. When they break, or you put in a new engine.

Both are high mileage units that far exceed any time we will ever see in our application.

[Raceworks]

How often should the plugs be changed?
How often should coil packs be replaced?

thanks
greg

In the street cars they're 96,000 "no service" engines. The tune up even then is new plugs and checking the valve clearances. In my street car I had a coil pack go bad after about 150,000 miles.

On the race cars after 3 seasons (approximately 75 hours on the dash, including idling & warm-up time) I decided to change out the spark plugs, coils, fuel injectors and the belts to the oil pump & alternator. But I'm kind of paranoid about that stuff.

About the only thing's I've seen reliability wise on these are-

• Metal mesh fuel filters like to clog up, probably ethanol-related. I prefer paper element filters. Change the filter every season.
• I've had fuel pressure regulators and fuel pumps go bad. I prefer the external ones because they're easier to get at, more reliable, and you can tweak them on those occasions when the pumps start going bad. I managed to nurse a dying pump with one through most of a weekend.
• If you tend to like running the car low on fuel (or you're like me and your car has a relatively tiny fuel cell), don't expect to get more than 2 seasons out of a fuel pump.
• If you're using the oil pressure senders from the HPD auxiliary harness kit, remote-mount them. They like to break in some applications if they're attached directly to the block.

One other thing, have a drain-hose setup handy and always drain the fuel after the race weekend is over, especially if you're using pump gas. Even some "ethanol free" gasoline actually contains some ethanol, and it's a good idea not to let any fuel linger in the cell between race weekends.

Note that all of these numbers assumes you're running as often as I do, which is the equivalent of about 8-12 club races a year. If you're only getting out to the track a couple times a year things will likely last longer.