[General | Members | C900 | 9000 | NG900 & OG93 | 92X | 93 | 95 | NG95 | 97X | 99 | Sonett | Vintage Models | Performance | Detail | Clubs & SOC | Other Cars | Books Movies & Music | Chat | FAQs | Gifts | Photos | Classifieds | Polls | Raffle | Sponsors]

General Bulletin Board
Search:

[Main General Bulletin Board | Post Followup | FAQ ] [ Prev by Date ] [ Next by Date ] Member Login / Signup [Most Recently Edited Saabnet.com Photo Galleries]
at WOT only!
Posted by Siegfried (more from Siegfried) on Thu, 14 Jun 2012 14:57:27
In Reply to: More like 20-30% efficient, Reality, Thu, 14 Jun 2012 13:12:08
Realty,
there's a figure called 'combustion ratio' which significantly affects Carnot cycle efficiency which most of our gasoline engines run on (this is Saab BB, not Mazda, right?). And there's another figure called 'effective combustion ratio' (physicists consider it being empirical, but engine engineers are using it fully) which depends on the intake pressure. There's no 20-30% efficiency when you're idling unless you snatched that very SVC engine from Trollhattan. And as far as I know that engine is still there in Sweden.

Ok, let's try another approach. Since most of fellows here do not adherent academic way of studying things and tend to be more practical, let's have a look at an engine performance graphs. You can pick up any engine you like. On a such graph you'll see the power vs rpm curve, torque vs rpm curve and - finally - petrol flow curve. Unfortunately, most of the graphs you are able to find will give you the full-load set of curves only. But should you be persistent and do digging deeper, you'll see what's happening on partial loads from idling to full load. Yep, modern engines with variable valve timing work better - i.e. more efficient - than old ones, but they're far from being a perfect one which is showing a constant efficiency thru the whole RPM-load range.

So... how many miles have you made at WOT today?

Zig

P.S.
Sorry for being this naughty. I initially thought to skip it, but just could not help it.

posted by 87.228.10...
Posts in this Thread:
Members can receive an alert when someone posts in this thread.
Post a Followup

Name:
E-Mail: (Confidential & Secure - Not revealed to other users!)
Send me email when someone posts in this thread: (available to Members)

Subject:

Posting rules are simple - No for sale/wanted ads or live auctions may be here - use the classifieds.
You may not cross-post your message to multiple BBs.
Personal attacks, insults, or flaming are not allowed.
Posting any of this will result in an immediate loss of posting privileges on this site.
Site Members do not see any warning (red) text.

Message:

Optional Link URL: (e.g. http://www.saabnet.com/)
To promote your own Saab site here, you must have a link back to The Saab Network.
Link Title:
Optional Image URL: (e.g. http://www.saabnet.com/img.jpg)


The content on this site may not be republished without permission. Copyright © 1988-2012 - The Saab Network - saabnet.com.
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no Spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Donations
Your address is: 107.21.186.38 - Using CCBot/2.0 - Logged.
Site Members do not see red text instructions, green links, and bottom of the page banners.
Click here to see all the Site Membership Benefits!