David,
check that you input the correct head gasket thinkness, you listed
it below as 0.13mm should be ~1.3mm.
If you want to work it our for yourself here's how
all inputs in millimeters:
cyl_cc = cyl_bore * cyl_bore / 4 * 3.142 * stroke / 1000
tdc_cc = cyl_bore * cyl_bore / 4 * 3.142 * piston_down_from_TDC /
1000
gasket_cc = gasket_bore * gasket_bore / 4 * 3.142 * gasket_thickness
/ 1000
chamber_cc = head_cc + gasket_cc - tdc_cc + dish_cc
CR = (cyl_cc + chamber_cc) / chamber_cc
I've uploaded a Datsun Engine Calculator Excel97 speadsheet to OZDAT if
that makes it easier for you.
http://www.ozdat.com/members/uploads/datsun_engine_calculator_v1.0.xls
It includes standard aussie spec L16, L16SSS, L18, L18SSS and L20B
engine info for people to play with.
If anyone want's to add the LZ engines or any other your most welcome
to.
I have to thank Jason Gray of the Bluebirds list for some of the engine
specs listed in his wicked Frankenstein L Series webpages!
enjoy,
Craig.
David Costello wrote:
Anyone here every used Desktop Dyno 2000?I'm having troubles getting
accurate compression ratio figures from it just to test how accurate it
was I put in all the figures from a
motor I allready knew the compression ratio for....a stock L20B Bore :
85mmStroke : 86mmHead Chamber Volume : 45cchead gasket thickness :
0.13mmpiston down from TDC :
0mmpiston dish cc : 8cc those are the specs I've inputed and it's
telling me the comp. ratio is 10.08 : 1 have I done something wrong or
is the software inaccurate? Dave
--membersozdat-------------------------------------------------------
OZDAT Mailing List Please Note:-
Send (un)subscribe requests to [EMAIL PROTECTED]
Send submissions to [EMAIL PROTECTED]
No unauthorised redistribution of this email
http://www.ozdat.com/ozdatonline/index.htm
http://www.ozdat.com/ozdatonline/listindex.html
http://www.mail-archive.com/[email protected]/
---------------------------------------------------------------------
--membersozdat-------------------------------------------------------
OZDAT Mailing List Please Note:-
Send (un)subscribe requests to [EMAIL PROTECTED]
Send submissions to [EMAIL PROTECTED]
No unauthorised redistribution of this email
http://www.ozdat.com/ozdatonline/index.htm
http://www.ozdat.com/ozdatonline/listindex.html
http://www.mail-archive.com/[email protected]/
---------------------------------------------------------------------
