Re: [MBZ] Compression measurement
The check valve is at the gauge end! This is riduculous as you say. Chinese piece of crap that I paid a lot of money for. PEter 2008/12/11 Jim Cathey <[EMAIL PROTECTED]> > I did some calculations and the volume of the pipe leading up to >> the gauge is about 13.8 cm3! >> > > So what? That's why there is a check valve in the part that screws > into the head. If there isn't, the gauge is of course a POS, as > you've calculated. But even my $18 Harbor Freight diesel compression > set has the check valves in the right places. > > -- Jim > > > > > ___ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Compression measurement
I did some calculations and the volume of the pipe leading up to the gauge is about 13.8 cm3! So what? That's why there is a check valve in the part that screws into the head. If there isn't, the gauge is of course a POS, as you've calculated. But even my $18 Harbor Freight diesel compression set has the check valves in the right places. -- Jim ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Compression measurement
Wow. I believe that all the threaded adapters in my Harbor Freight gauge set have check valves in them. Putting the valve in the gauge head with a hose upstream from it is insane, unless it is intended for tractors with 8" diameter pistons. Mitch. ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Compression measurement
After having bought a diesel compression gauge - not the motometer one unfortunately- I find I always got low compression values - around 16 bar. The instrument has a long ( 430 mm ) 1/4 " ID pipe going to the non-return value which is at the base of the gauge. Well I did some calculations and the volume of the pipe leading up to the gauge is about 13.8 cm3 ! When compared to the combustion chamber volume of around 27.2 cm3 it is quite significant as the pipe volume can be considered as part of the combustion chamber . This reduces the effective compression ratio to about 14.6! - no wonder the pressures are always pretty low. Are my assumptions correct ? Does the motometer instrument have the non return valve at the "engine" end ? Peter ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
