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New Edge Cobras
opinions on compression ratio for my build
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<blockquote data-quote="IUP99snake" data-source="post: 10107293" data-attributes="member: 7060"><p>Gone are the days where you could only run 8.5:1. That'll make your car a dog, especially with a centri. With advances in tuning and other methods of controlling detonation like E-85, and meth injection, you can have your cake and eat it too.</p><p></p><p>If you have meth injection, don't be afraid of higher compression! I'd like to say 9.5:1 like everyone else to stay safe, but you could go a little higher, say, 10:1 with meth and still run high boost.</p><p></p><p>There's a guy on Modularfords.com that is running the Aluminator high compression block (10:1) with a whipple blower, pushing 16-18LBS and he's planning on turning it up to over 20LBS. Granted, he's running E-85. But with meth and a proper tune, you'll be happy you've got the higher compression.</p><p></p><p>It makes your engine more efficient. You get better mileage. Better throttle response. Better low end power. </p><p></p><p>I have a 10.3:1 long block and I'm running 10-12 LBS of boost. Oh, and it's not forged. Stock Aviator long block. I haven't had any problems with it in 60,000 miles. Granted, it's a real conservative tune that pulls timing in the high RPM. </p><p></p><p>Oh, and with those 03 heads, you'll also get lots of extra power down low. Combined with the higher compression, my motor made less peak HP, but up to 100 more HP lower in the RPM range than my previous combination with low compression and 99 heads. </p><p></p><p>Just don't go any less than 9.5:1. </p><p></p><p>Homer</p></blockquote><p></p>
[QUOTE="IUP99snake, post: 10107293, member: 7060"] Gone are the days where you could only run 8.5:1. That'll make your car a dog, especially with a centri. With advances in tuning and other methods of controlling detonation like E-85, and meth injection, you can have your cake and eat it too. If you have meth injection, don't be afraid of higher compression! I'd like to say 9.5:1 like everyone else to stay safe, but you could go a little higher, say, 10:1 with meth and still run high boost. There's a guy on Modularfords.com that is running the Aluminator high compression block (10:1) with a whipple blower, pushing 16-18LBS and he's planning on turning it up to over 20LBS. Granted, he's running E-85. But with meth and a proper tune, you'll be happy you've got the higher compression. It makes your engine more efficient. You get better mileage. Better throttle response. Better low end power. I have a 10.3:1 long block and I'm running 10-12 LBS of boost. Oh, and it's not forged. Stock Aviator long block. I haven't had any problems with it in 60,000 miles. Granted, it's a real conservative tune that pulls timing in the high RPM. Oh, and with those 03 heads, you'll also get lots of extra power down low. Combined with the higher compression, my motor made less peak HP, but up to 100 more HP lower in the RPM range than my previous combination with low compression and 99 heads. Just don't go any less than 9.5:1. Homer [/QUOTE]
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