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-   -   Compression Ratio for 74 ford 2.3 ? (http://www.hotrodders.com/forum/compression-ratio-74-ford-2-3-a-224307.html)

Quarter Flash 09-23-2012 04:09 PM

Compression Ratio for 74 ford 2.3 ?
 
Hi
I am going to put a cam in a 74 Ford 2.3. I have heard the compression ratio is 8.5 but am not sure. Does anyone know for sure what the cr is on this engine? The engine is in a 28 A roadster pickup.

B

ap72 09-23-2012 04:30 PM

you can mill a LOT of that head- enough to allow for any compression that your heart desires. I'd bump it up to about 9.7:1, pick up a ranger "header" manifold, and put in a cam with about 225/225 duration. It's a great combo using all stock parts- except the cam.

Quarter Flash 09-23-2012 08:16 PM

Thank you for that information. If anyone knows what ratio I am starting out with for sure it would also be helpful

B

ap72 09-24-2012 07:56 AM

Quote:

Originally Posted by Quarter Flash (Post 1593352)
Thank you for that information. If anyone knows what ratio I am starting out with for sure it would also be helpful

B

actual vs "advertised" compression can vary quite a bit for older cars. just meausre your piston volume, deck clearance, gasket thickness, and head volume and calculate your own compression.

If you don't have a mic you can measure your volume above the piston by bringing it to TDC and sealing the edges with a thin layer of petroleum jelly. Use a common medical syringe to measure the volume- available at any corner drug store.

be sure to have it level and seal the top with either a hard plastic sheet or an old CD.

These are common cheap tricks that most of us use around here.

cal1320 09-30-2012 05:08 PM

My 1981 chilitons book lists the comperssion for a 1974 Pinto at 8.4 to 1.
BTW, when you mill the head on a Pinto engine, you need an adjustable cam sprocket to correct the cam timing after the head mill.


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