11.5 cr with boost on stock internals - Mustang Evolution

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Old 08-06-2013, 04:57 PM   #1
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11.5 cr with boost on stock internals

I have shaved heads on my sohc mustang and I'm wondering if I could boost it on the stock internals? I have 11.5 compression ratio.
Thanks

Something like this
http://www.americanmuscle.com/mustan...er-0004gt.html
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Old 08-06-2013, 05:47 PM   #2
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Holy crap... How aggressively did you shave the heads!?!? I'm not sure that's even possible haha. 11.5 cr on stock internals leaves you room for maybe 5-6psi... But even that is pushing and it will be a total ***** to tune.
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Old 08-06-2013, 06:21 PM   #3
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For boost you want low compression that's why stock mustangs love boost for a high compression like that nitrous would be best
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Old 08-06-2013, 08:08 PM   #4
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Yeah, thats two points. I dont think that you could get there by just shaving heads. Even with decking the block. Regardless, I believe that the stock compression ratio is too high for efficient and safe supercharging. By about a point and a half. Youre bolting a time bomb on the engine. Many will disagree but that is my opinion. So Noooooo. 11.5 is way too high...
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Old 08-06-2013, 08:29 PM   #5
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U must like buying c-16 racing gas lol 11:5:1 cr and supercharging ummmm no
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Old 08-06-2013, 09:19 PM   #6
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I thought it seemed too high, I'm not exactly sure as that's just what the guy I got the motor from told me. Is there any possible way to check to see how much was shaved?
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Old 08-06-2013, 09:25 PM   #7
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Yes. You can CC the combustion chambers to determine their volume.
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Old 08-06-2013, 09:29 PM   #8
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Quote:
Originally Posted by straybullitt View Post
Yes. You can CC the combustion chambers to determine their volume.
+1.

No boost for you if the cr is true!
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Old 08-06-2013, 09:46 PM   #9
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The story behind it was I bought a 98 cougar with a rebuilt pi motor from a 2000gt. The guy was a laid off ford mechanic who had a wrecked in the rear mustang he pulled the motor rebuilt it And put it in the cougar. It has those bbk valve covers it is a pi motor and it ran and drove. 373 gears and flowers master mufflers, I bought the car for 500 bucks I figured I couldn't go wrong, because the motor ran and sounded awesome. And he said it had a 3 angle valve job which if believeable. But the part about having the 11.5 cr is what got me, really the thing that concerned me.
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Old 08-06-2013, 10:05 PM   #10
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It sounds like you got a hell of a deal. The car should be worth a couple hundred dollars in scrap after you cannibalize it. Who knows what the actual compression ratio is huh? Ill bet that the guy who built it didn't calculate it out exactly. It's alot of extra work. Thats why custom built engines are so expensive. The little details. I'd cam it and drive the ***** like I stole it...
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Old 08-06-2013, 10:12 PM   #11
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Yeah that's what I'm thinking I imagine I could get about 200 scrap and it's like I got all that for 300. And 11:1 seems more realistic. I'm gna use 93 anyway to be safe.
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Old 08-07-2013, 09:44 AM   #12
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Quote:
Originally Posted by Jesshawk35 View Post
I have shaved heads on my sohc mustang and I'm wondering if I could boost it on the stock internals? I have 11.5 compression ratio.
Thanks

Something like this
Mustang Vortech Supercharger System - Satin (99-04 GT) 4FL218-010L||4FL218-130L
These guys have pointed you in the right direction. That is super high compression! You want low compression for boosted cars and high compression for nitrous cars. You could probably get away with a blower on this motor but I wouldn't recommend running more than 6-8PSI and that may be pushing it!

Your best bet would be to pop the motor open and measure the volume to figure out exactly what the compression was shaved too. Please let me know if you have any questions or need some assistance in the near future!

-Dan
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