Compression Ratio

[SteveStang]

Hi Everyone

I am still rebuilding my 200 and have now ordered a 264 cam and a dual roller chain.The head has been rebuilt as well as the block has been cleaned and have all the parts for the rebuild on that.
The valves have been cut back,I have a Holley 2 barrel,header,electronic ignition but I have no idea about my compression.
How do I know what it is right now?If I were to put a gasket on the head and the block has not been decked,what would it be?
Do I need to go to a different gasket?Steel or fiber?How can I adjust for ratio now that everything is ready to assemble?
How do I measure the ratio anyways?
Any help would be greatly appreciated.
Thanks
SteveStang

 

[Anonymous]

The Ford Falcon Performance Book has a detailed section on figuring compression ratios. Hope this helps.

 

[michael_cini]

that is good advice from watertrucker. the book is great.

also check out this link for figuring compression. http://falconperformance.sundog.net/compcalculator.asp

and while were at it, here is a good thread that might help. http://fordsix.com/forum/viewtopic.php? ... light=2502

Hi Everyone

I am still rebuilding my 200 and have now ordered a 264 cam and a dual roller chain.The head has been rebuilt as well as the block has been cleaned and have all the parts for the rebuild on that.
The valves have been cut back,I have a Holley 2 barrel,header,electronic ignition but I have no idea about my compression.
How do I know what it is right now?If I were to put a gasket on the head and the block has not been decked,what would it be?
Do I need to go to a different gasket?Steel or fiber?How can I adjust for ratio now that everything is ready to assemble?
How do I measure the ratio anyways?
Any help would be greatly appreciated.
Thanks
SteveStang

 

[Hot 6t Falcon]

Steve,

Did you get the compression figured out?

If you tell me the letters/numbers cast into the rear of the intake log on the head I can help you guess the head's cc's.

The best way is to measure one (or all) of the combustion chambers.

1) put an old spark plug in.
2) balance the head with the combustion chambers up.
3) get a 1/8 to 1/4 inch thick piece of plexiglass (screen door plastic does nicely) at the hardware store. It only needs to be about 5 inches by 5 inches. Set it on the combustion chamber and mark about where the sparkplug is. Drill a 1/4 hole through the plastic over the spark plug. Cost about $2.00.
4) to attach the plastic use a film of Vaseline on the head and push the plastic firmly into place.
5) goto a "farm" store that sells cattle and horse stuff to buy a syringe. They have big syringes. About 20 cc wil do. Cost is about $2.00.
6) HAVE TOWELS READY! Squirt water into the 1/4 inch hole in the plastic. If the water runs through the valve seats, pull the plastic and smear a film of Vaseline around the valve seats too - you might even do this first, before you make a mess.
7) It's best to do all of the chambers.
8) WRITE DOWN the number of CC's for each combustion chamber.
9) now goto my web site and run the compression calculator.

Cost = about $4.00
Getting your head straight = PRICELESS

Good Luck