how much would my compression ratio go up? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 4 Old 03-23-2011, 08:10 PM Thread Starter
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how much would my compression ratio go up?

i am considering changing out the stock e7's on my car for a set of windsor jr's. the windsor's have a 58cc combustion chamber. this is on a 306 which was rebuilt. the car has a t60 turbo running 8lbs of boost. will the smaller combustion chambers bump the compression ratio up too much? the 306 was built with forged pistons maintaining stock compression ratio which if i recall correctly is 9.0-1? before anyone asks i don't want to go with aluminum heads....the car will be a daily driver for the most part and i don't want to deal with the more fragile aluminum heads.

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post #2 of 4 Old 03-23-2011, 11:56 PM
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I'm pretty sure you going to end up at around 9.3 to 9.4 comp. ratio.The e-7's were supposed to be 62cc.I've seen them have a bit of a diff. over the years, from about 61-63cc.The bump will give you better off boost power, and at only 8 lbs. you should be fine.

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post #3 of 4 Old 03-24-2011, 03:21 PM Thread Starter
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would windsor sr's be better? they have 64cc chambers. not sure how much better they flow. the car also has an e-cam in it.
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post #4 of 4 Old 03-24-2011, 06:30 PM
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I'm no expert, so I hope others chime in,but I see no reason not to use the jr.s.I'm just getting back into turbo stuff after 20 years, but it sems a lot of guys that are running limited boost 6-10lbs. like the comp. a lttle higher.9.3-9.4 isn't that high when you look at some other combos.I think you would find the car a little more lively in regular driving and you will gain some extra power in boost.I guess the determining factors would be how good a bottom end you have and what power are you making.If it's a stock block you don't want to push past 475-525 ish if you want any longevity from it.If you really just drive it as a daily and don't plan on jumping up past 8lbs of boost your okay.Also making sure your tune is good and using good fuel in a good fuel systems are a must also.
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