8th Generation Honda Civic Forum - View Single Post

blueraptor · 07-25-2008, 10:24 PM

ssoh87,

Our new civic engine squirts oil underneath all four piston heads to low the combustion camber temperature. As far as I know, that's the only "anti-knock" system in the 8th civic. The lower the octane number (whether it's done through RON or MON), the more likely that it will ignite in lower temperature (premature ignition or knocking). That's why the engineers at Honda designed a cooling system for the pistons. But most still think for a compression ratio of 10.5/1, we should stick with premium gasoline or 91 octane and above. 87 octane is meant for engines with compression ratio from 8/1 to 10/1.

If you have have knocking problems and you've switched to premium gasoline (for long enough time that there should be no more residual 87 octanes left over), then make sure your spark plug is good. The revised gap for our engine is 0.39in to 0.44in. All 8th civics are equiped with Iridium spark plugs, so I doubt it's your spark plugs. The last a pretty long time: around 60,000miles. I got a set from Denso which was own by toyota that will last for 120,000miles. I would clean the whole fuel system by getting any fuel injection cleaner. I recommend Seafoam or STP Complete blah blah blah (sorry forgot what the blahs are, but do only get the one with "Complete" if you go with STP).

Diaz90,
Like I mentioned in my previous post, the clicking noise has died down after what I did. As far as the noise being an actual issue or not. Well... according to many online forums, it's not an issue. I'm on my vacation and I rented a Toyota yaris, which also has a tiny engine with 10.5/1 compression ratio, and it makes the same clicking noise. So that makes me feel better about our engine. Many online posts do state that the clicking noise is normal, and many have also owned a honda with clicking noise for as much as 200,000miles on it. Just make sure you maintain your car.

The only "new" finding I have after previously tinkering around is Seaform your engine. Like I said before, my engine oil gets dirty as hell right after an oil change. That's because of carbon buildup in the engine. After pouring some seafoam into my engine before an oil change, my oil is still clear after 800miles.

07-25-2008, 10:24 PM	#17 (permalink)
blueraptor Junior Member Join Date: Jul 2008 Posts: 8 iTrader: 0 / 0%	ssoh87, Our new civic engine squirts oil underneath all four piston heads to low the combustion camber temperature. As far as I know, that's the only "anti-knock" system in the 8th civic. The lower the octane number (whether it's done through RON or MON), the more likely that it will ignite in lower temperature (premature ignition or knocking). That's why the engineers at Honda designed a cooling system for the pistons. But most still think for a compression ratio of 10.5/1, we should stick with premium gasoline or 91 octane and above. 87 octane is meant for engines with compression ratio from 8/1 to 10/1. If you have have knocking problems and you've switched to premium gasoline (for long enough time that there should be no more residual 87 octanes left over), then make sure your spark plug is good. The revised gap for our engine is 0.39in to 0.44in. All 8th civics are equiped with Iridium spark plugs, so I doubt it's your spark plugs. The last a pretty long time: around 60,000miles. I got a set from Denso which was own by toyota that will last for 120,000miles. I would clean the whole fuel system by getting any fuel injection cleaner. I recommend Seafoam or STP Complete blah blah blah (sorry forgot what the blahs are, but do only get the one with "Complete" if you go with STP). Diaz90, Like I mentioned in my previous post, the clicking noise has died down after what I did. As far as the noise being an actual issue or not. Well... according to many online forums, it's not an issue. I'm on my vacation and I rented a Toyota yaris, which also has a tiny engine with 10.5/1 compression ratio, and it makes the same clicking noise. So that makes me feel better about our engine. Many online posts do state that the clicking noise is normal, and many have also owned a honda with clicking noise for as much as 200,000miles on it. Just make sure you maintain your car. The only "new" finding I have after previously tinkering around is Seaform your engine. Like I said before, my engine oil gets dirty as hell right after an oil change. That's because of carbon buildup in the engine. After pouring some seafoam into my engine before an oil change, my oil is still clear after 800miles.