<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><br class=""><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Ok, that does make sense. Maybe I should ask what a stock 1275 measure and work from there.<div class=""><br class=""></div><div class="">Thanks,</div><div class=""><br class=""></div><div class="">Lester</div><div class=""><br class=""></div><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Jun 20, 2020, at 1:35 PM, Weslake1330 <<a href="mailto:weslake1330@gmail.com" class="">weslake1330@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">If you don't know what the static compression ratio the engine was built with is, then I don't see how you can know if any given reading is bad. If your engine was built with a CR of 7:1 then a reading of 150 is probably great. However, if the engine was built with a CR of 11:1 then a reading of 150 might be disappointing</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 20 Jun 2020 at 16:46, Lester Ewing via Spridgets <<a href="mailto:spridgets@autox.team.net" class="">spridgets@autox.team.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;" class="">Colin,<div class=""><br class=""></div><div class="">Thanks, I am NOT trying to calculate compression ratio. I just want a rough number. Is 6 bad is 200 great? I am only trying to get a rough idea if the compression number I have is reasonable for the engine I have. Between 135 and 150 is what I want to know.</div><div class=""><br class=""></div><div class="">Lester</div></div></blockquote></div></div></blockquote></div></div></div></div></div></body></html>