Diesel engine is a "compression ignition" engine, so to fire the fuel/air charge it must raise the temperature of the charge to a point at or above the flash point of the fuel/air charge, so the engine "lights off".
Typical compression charge temps necessary to hit flash point for diesel is 400 degrees F. Ambient air temp plays a part in reaching that flash point, thus, glow plugs. Crank speed is another factor.. thus, the need for a strong battery. Next is compression condition of the engine. You can put a hair dryer in the intake, add a booster battery... but if you have low compression... very hard to start.. >From my experience, the magic happens best between 390 and 420 psi on a hot engine compression test. On Tue, Jun 19, 2018 at 10:49 AM, Larry Turner via Mercedes < mercedes@okiebenz.com> wrote: > Speaking of what an engines compression should be, I always thought it was > the compression ration X atmospheric pressure. So a engine with 18:1 (as a > diesel might be) would look for 18X14.7 (approx) = 264psi or so. While a > gas engine at 7:1 would be ~103. Is this logical? > > LarryT > > 91 300D (RIP ??) > > 06 E350 (POS also dead) > > 06 Ford Explorer > > 74 911 > > 66 MGB > > > On 06/18/2018 1:51 PM, Andrew Strasfogel via Mercedes wrote:Speaking of > >> Seller seems WAY too enthusiastic. Buyer beware. >> 264 >> On Mon, Jun 18, 2018 at 10:33 AM, Frederick Moir via Mercedes < >> mercedes@okiebenz.com> wrote: >> >> Depends on cranking speed amongst other criteria. >>> Fred. >>> >>> On Mon, Jun 18, 2018 at 10:18 AM, Kaleb C. Striplin via Mercedes < >>> mercedes@okiebenz.com> wrote: >>> >>> Closer to 400 or over in my mind >>>> >>>> Sent from my iPhone >>>> >>>> On Jun 17, 2018, at 9:49 PM, Dwight Giles <dwight.gi...@gmail.com> >>>>> >>>> wrote: >>>> >>>>> What should they be? >>>>> >>>>> Dwight Giles Jr. >>>>> Wickford RI >>>>> >>>>> On Jun 17, 2018 10:21 PM, "Kaleb C. Striplin via Mercedes" < >>>>>> >>>>> mercedes@okiebenz.com> wrote: >>>> >>>>> 1979 Mercedes-Benz 300SD **VERY CLEAN** >>>>>> >>>>>> https://albuquerque.craigslist.org/cto/d/1979- >>>>>> >>>>> mercedes-benz-300sd-very/ >>> >>>> 6612681421.html >>>> >>>>> >>>>>> Sent from my iPhone >>>>>> >>>>>> _______________________________________ >>>>>> http://www.okiebenz.com >>>>>> >>>>>> To search list archives http://www.okiebenz.com/archive/ >>>>>> >>>>>> To Unsubscribe or change delivery options go to: >>>>>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>>>>> >>>>>> _______________________________________ >>>> http://www.okiebenz.com >>>> >>>> To search list archives http://www.okiebenz.com/archive/ >>>> >>>> To Unsubscribe or change delivery options go to: >>>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>>> >>>> >>>> >>> -- >>> Fred Moir >>> Lynn MA >>> Diesel preferred >>> _______________________________________ >>> http://www.okiebenz.com >>> >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >>> >>> _______________________________________ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> >> > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
