Thanks Guys,
The DCOE45 can fairly suck it in, no wonder they make an engine go so well.
Have you got any data on the 38mm Hitachi have you - just put a few urban
myths to bed for me.
Terry
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Errol Smith
Sent: Friday, 8 September 2000 7:44 AM
To: [EMAIL PROTECTED]
Subject: Re: Airflow calculations
Eddie,
These flow rates at 1.5" Hg are the equivalent of 0.75 Psi pressure
differential across the ends of the carb. On the post I sent back to terry
the flow rates are the maximum flows for the choke sizes. The 40 mm chokes
flow 280 cfm maximum on vehicle. This means there is only 57 cfm difference
between the test flow and the actual on vehicle flow. The flow rates are in
direct proportion to the cross sectional area of the choke
Thanks for the info on the smaller size chokes.
Cheers
Feral Errol
----------
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: Airflow calculations
Date: Friday, September 08, 2000 4:18
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
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