200ci i6 Compression Test

cgstarry · September 15th, 2007, 12:09 AM

Hi All,

We did a compression test on our '66 inline 6 and have a few questions about the results.

We got 140psi on all cylinders and no change after squirting in some SAE 30 oil so we concluded the rings were OK.

I also suspect the valves and head gasket are ok since all the cylinders are the same.

One thing is bugging me: The specifications for the engine state the compression should be 155-190psi at sea level. Did I only get 140psi because in Minneapolis we are about 850feet above sea level?

I rechecked the procedure outlined in the shop manual. The one thing I missed was propping open the throttle plate. Could this accoiunt for the difference in compression? I turned the engine over 5 cycles on each cylinder.

Thanks for any info / guidance.

John

460brevill · September 15th, 2007, 08:01 AM

sea level and throttle plate make a diff.if you got 140 all the way i would leave it alone.

cgstarry · September 17th, 2007, 11:17 PM

Sounds good to me - thanks!

John

September 15th, 2007, 12:09 AM	#1
cgstarry Regular 2007 Mustang GT, 66 Coupe Join Date: May 2007 Location: Minneapolis, MN Posts: 115	200ci i6 Compression Test Hi All, We did a compression test on our '66 inline 6 and have a few questions about the results. We got 140psi on all cylinders and no change after squirting in some SAE 30 oil so we concluded the rings were OK. I also suspect the valves and head gasket are ok since all the cylinders are the same. One thing is bugging me: The specifications for the engine state the compression should be 155-190psi at sea level. Did I only get 140psi because in Minneapolis we are about 850feet above sea level? I rechecked the procedure outlined in the shop manual. The one thing I missed was propping open the throttle plate. Could this accoiunt for the difference in compression? I turned the engine over 5 cycles on each cylinder. Thanks for any info / guidance. John __________________ Vista Blue 2007 Mustang GT Premium Coupe 5 Speed FRPP GTA Axelbacks, AMSOIL XL 5W-20 Steeda CAI w/ High Flow Elbow, SCT xCalibrator 2

September 15th, 2007, 08:01 AM	#2
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,311	sea level and throttle plate make a diff.if you got 140 all the way i would leave it alone. __________________ i sixing 200 six with 300 hp.

September 17th, 2007, 11:17 PM	#3
cgstarry Regular 2007 Mustang GT, 66 Coupe Join Date: May 2007 Location: Minneapolis, MN Posts: 115	Sounds good to me - thanks! John __________________ Vista Blue 2007 Mustang GT Premium Coupe 5 Speed FRPP GTA Axelbacks, AMSOIL XL 5W-20 Steeda CAI w/ High Flow Elbow, SCT xCalibrator 2

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