Re: Airflow calculations

[eddie]

Terry,   I found a chart in a book giving the CFM for a 45DCOE with various chokes. For the test the carb was fitted with 56mm trumpets and 3.5 auxilary venturi. Results were as follows...   40mm choke ...223cfm 38mm choke...218cfm 36mm choke...209cfm 34mm choke...188cfm 32mm choke...162cfm 30mm choke...136cfm 28mm choke ..112cfm   This flow is for one barrel. Test at 1.5" mercury. I don't know if this represents maximum airflow or not. Interesting how there is such a massive flow difference between the smaller choke sizes.   Eddie England 510, KP710, B10, KB110, B110, B120, J710, H230, G620, P330, SRL311, C30, VBF10, F10, S12 [EMAIL PROTECTED] pics at www.ratdat.com ----- Original Message ----- From: Terry & Heather To: [EMAIL PROTECTED] Sent: Thursday, September 07, 2000 5:25 PM Subject: RE: Airflow calculations Kevin,   very interesting post.   I have just one question - carbies are rated at a certain cfm eg Holley 780 cfm (from my Ford 351 days)   How do you calculate the cfm rating of a carbie, sort of like a pipe I guess which is along the lines of the original question.   What's the cfm rating of a DCOE45?   Terry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Kevin Sent: Thursday, 7 September 2000 10:33 AM To: [EMAIL PROTECTED] Subject: Airflow calculations This is the formula we use at work to work out air flow needs Air flow (CFM) = Displacement (cubic inch) X RPM X VE 1728 CF CYCLE FACTOR (CF) CF: 4 cycle diesel/petrol engine = 2 CF: 2 " " " " = 1 VOLUMETRIC EFFICIENCY (VE) Naturally aspirated diesel/petrol engine = 0.85 Supercharged engine = 1.2 Turbo engine (we use this on for diesels) = 1.4 Eg Airflow = 109 x 6000 X 0.85 1728 2 = 555900 3456 = 160.85 cfm (this suits a 1800cc engine) Litres to CI 1 LT = 60.5 CI eg 1.8 lt X 60.5 = 108.9 CI >>>> -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of brad Sent: Wednesday, 6 September 2000 12:57 PM To: [EMAIL PROTECTED] Subject: airflow calculations does any 1 know the formula for calculating the cfm of a pipe thanx in advance Brad --------------------------------------------------- Kevin Harlan WILDKAT SPARES 898 STUART HIGHWAY BERRIMAH NT 0828 PO BOX 325 BERRIMAH NT 0828 Ph: 08 8932 5544 Fax: 08 8932 5788 ("`-''-/").___..--''"`-.____ `-.(@ @ ).`-.__.`)``-..-'-""" (_Y_.)' ._ ) `._ `. _..`--'_..-_/ /--'_.' ,' (il).-'' (li).' ((!.-' EMAIL: [EMAIL PROTECTED] WEB: www.wildkatspares.com --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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --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/membersozdat@datascribe.com.au/ ---------------------------------------------------------------------