Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Lower Compression Ratios

Compression ratios have been lowered by various modifications in the piston head design and in the quench height. This reduction in compression ratios permits the engine to operate satisfactorily on lower octane fuel, thereby achieving a slight reduction in HC and NOx emission levels.