Subject	Here is my experience...
Posted by	AzHeat on October 29, 2005 at 11:59 AM
	This message has been viewed 102 times.
In Reply To	yes... posted by AntiHero on October 29, 2005 at 10:05 AM
Message	I ran 18psi on 91 octane and with 8:1 compression and didn't hear any detonation. I was doing little over 500rwhp on my car with my turbos. Well after my rod bearing took a dump after 5000 miles, the engine disassebly revealed melted pistons on three of the pistons. The compression was the same on the cylinder with the melted pistons as with the cylinder with no sign of melting. I could see the top of the compression ring in the worst cylinder when I took the heads off becuase of portion of the edge of the piston had melted away. The compression ring was till holding compression. Unless you have some way of inspecting your pistons with th heads on , it is not worth the risk. Also water injection should help lots.
Follow Ups	Just wondering? - Andrew(nj) 03:54:09 10/29/05 I believe Mark Leader (sirpriz) raised his compression, lets - Eishozzzz 06:04:05 10/29/05 yep, he is running 9:1 (n/m) - aliaZ 09:32:17 10/29/05 I copied you, in fact I took your engine, you haven't - SirpriZ 18:33:30 10/29/05 if you raise the CR, you can't run as much boost. - Marshall 08:04:33 10/29/05 Hi Marshall, My understanding is that boost nets more - SirpriZ 19:20:03 10/29/05 "Nets more torque THAN by raising the CR." (n/m) - SirpriZ 19:23:07 10/29/05 on my red car i ran 9>1 - Z32POWER.com 08:09:51 10/29/05 what kind of boost were you able to run on pump gas? 9:1 (n/m) - AntiHero 11:20:04 10/29/05 i never really pushed it, i just ran 17 for safety (n/m) - Z32POWER.com 12:19:10 10/29/05 forced induction compretion is more efficient than N/A>>>> - madtdogs 08:16:15 10/29/05 most people dont run enough boost though - AntiHero 10:07:53 10/29/05 Would you consider the GT2860RS turbo's small-medium sized? - MOTRSPRT--ID 19:28:00 10/29/05 it's a little more complicated than that (n/m) - mousersix (San Antonio) 11:40:28 10/29/05 yeah.... didnt feel like typing an hour long post ... srry (n/m) - madtdogs 07:03:23 10/30/05 I'm running 9.2:1 - aliaZ 09:35:24 10/29/05 When you compression test your engine what kind - EricTTZ 09:41:31 10/29/05 well - aliaZ 10:48:27 10/29/05 with longer duration cams, you compression should drop. (n/m) - AzHeat 11:25:58 10/29/05 good point (n/m) - aliaZ 11:34:25 10/29/05 Anyone running Wiseco pistons has 8.8:1 compression----> - Kyle(Houston) 09:45:28 10/29/05 yes... - AntiHero 10:05:59 10/29/05 You will blow your engine up... - Scotts94z32 10:28:50 10/29/05 serisouly asking... - AntiHero 10:33:28 10/29/05 No, I do not. - Scotts94z32 10:45:29 10/29/05 long gone.. - AntiHero 10:56:14 10/29/05 You'll probably never find out, either. - Marshall 11:04:44 10/29/05 Hi Scott, I'm actually going to weld the wastegates - SirpriZ 18:52:40 10/29/05 Hi Mark your crazy, talk to you later. lol!!!! Lee (n/m) - lewoolf2 22:52:00 10/29/05 Here is my experience... - AzHeat 11:59:25 10/29/05 i dont get it... - AntiHero 12:20:29 10/29/05 I am also running 500rwhp. I have more power and - AzHeat 12:32:33 10/29/05 Isn't 91 octane wonderful? On paper, the 8:1 CR and - SirpriZ 18:42:54 10/29/05 Yea, 91 octane sucks. (n/m) - AzHeat 19:14:15 10/29/05 i believe member aliaz runs over 9:1 compression and is - CollegeBoy 10:39:25 10/29/05 lol..woops. he already stated that above sorry. (n/m) - CollegeBoy 10:40:27 10/29/05 He is also running bigger cams. That affect compression - AzHeat 11:34:29 10/29/05 compression ratio (as he was referring too) has nothing to - jkperformance 12:19:07 10/29/05 Cam duration and lift affects a motor's compression - AzHeat 12:40:56 10/29/05 exactly, which is why the cams don't change the - jkperformance 12:50:27 10/29/05 i'll be going with a little more compression then AliaZ - ni[X]it 21:39:14 10/29/05
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