Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-15-2005, 06:04 PM
Registered User
 
Join Date: Nov 2002
Location: Wakefield, RI
Posts: 2,145
How many CFM flow on 617TD intake?

I am in the process of coming up with a cold air intake solution that doesn't use a K&N filter. I have found some possibilities but I need to know how many CFM a 617 turbo engine requires. I'm a little "math challenged" so I was hoping some of the engineers here would be able to figure this one out. Thanks, RT

__________________
When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K
Reply With Quote
  #2  
Old 01-15-2005, 06:32 PM
Geezer
 
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
Natural aspiration,

4500 rev / min x 3.0 liter / 2 = 1.5 liter / rev = 6,750 liter / min

6,750 liter / 28.3 cu. ft. = 239 cfm

Assume 2x volume for 1.0 bar (atmosphere) boost = 478 cfm

500cfm is in the ballpark.

Best Regards,
Jim
Reply With Quote
  #3  
Old 01-15-2005, 06:49 PM
Registered User
 
Join Date: Sep 2004
Location: Bothell, WA
Posts: 237
Jim

I was just in the process of coming up with similar numbers, but I divided by 4 not 2, since only "about" 1/4 of the engines volume is on the intake cycle each revolution. It would be easier with a 4 cylinder 4 stroke engine, where only 1 cylinder is on intake each stroke, but I figure it's close enough with a 5 cylinder.

As a result my numbers were all about half of what yours are.

Kevin
__________________
'85 300SD
Reply With Quote
  #4  
Old 01-15-2005, 06:57 PM
Geezer
 
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
Kevin, as I understand, engine 'displacement' is taken as the total volume of all of its cylinders.

One complete revolution is used for intake and compression, and one complete revolution is for power stroke/exhaust. So, I divide by 2 to calculate volume of air introduced by the intake cycle of the cylinders.

Best Regards,
Jim
Reply With Quote
  #5  
Old 01-15-2005, 07:00 PM
boneheaddoctor's Avatar
Senior Benz fanatic
 
Join Date: May 2004
Location: Hells half acre (Great Falls, Virginia)
Posts: 16,007
If we were discussing Normally aspirated engines then velocity and CFM would be more critical to be matched to the engine so intake pulses would reinforce each other helping in getting the most air into the cylider........

With a turbo the key is to have the filter with the largest surface area possible to offer the least restriction within the given space you have.
__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
Reply With Quote
  #6  
Old 01-15-2005, 07:07 PM
Registered User
 
Join Date: Sep 2004
Location: Bothell, WA
Posts: 237
Quote:
Originally Posted by Jim H
Kevin, as I understand, engine 'displacement' is taken as the total volume of all of its cylinders.

One complete revolution is used for intake and compression, and one complete revolution is for power stroke/exhaust. So, I divide by 2 to calculate volume of air introduced by the intake cycle of the cylinders.

Best Regards,
Jim
Jim

Ah yes I see. I had confused strokes with revolutions. There are indeed two strokes per revolution, one down and one up.

Thanks

Kevin

__________________
'85 300SD
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 11:42 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page