Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

About To Start An 1275+ Engine Build And Would Love Feedback

Started by Jonnym71 , Jun 10 2025 04:57 PM

Prev

Please log in to reply

16 replies to this topic

#16 Java_Green

Mini Mad

TMF+ Member
172 posts

Location: West Coast

Posted Yesterday, 08:15 AM

Match the compression to the cam and rocker combination. Most people use too much static compression. Road cams with smooth idles up to 9.5 to 9.75:1. Cams with lope to the idle 10:1 max. 280 duration cams 10.5:1 max. All using E5 97+ octane fuel.

Ac

So what are the CR figures for E10 RON95 and are figures based on roughly the same dynamic CR figure?

Back to top

#17 Java_Green

Mini Mad

TMF+ Member
172 posts

Location: West Coast

Posted Yesterday, 09:15 AM

Match the compression to the cam and rocker combination. Most people use too much static compression. Road cams with smooth idles up to 9.5 to 9.75:1. Cams with lope to the idle 10:1 max. 280 duration cams 10.5:1 max. All using E5 97+ octane fuel.

Ac

So what are the CR figures for E10 RON95 and are figures based on roughly the same dynamic CR figure?