Re: 356 CI Compression Ratio

Posted by TxGoat On 2023/12/31 18:47:43

More compression on the older models, within reason, will improve performance and economy, and can offset power losses due to higher altitude operation and ethanol adulterated fuel. More compression will place higher demands on the ignition system, but a system in good order will have no problem, and combustion chamber deposits will be reduced. The HC head for the 120 model 282 raised compression from about 7:1 to about 7.5:1, and I believe that Packard claimed power increase of 3 to 4%, which would be in the 4 to 5 HP range. A similar gain in fuel efficiency might be expected, provided operating parameters remained unchanged.