| View previous topic :: View next topic |
| Author |
Message |
Lizard
Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada
|
 Posted: Fri Nov 23, 2007 2:00 pm Post subject: |
 |
|
Very good book, though I found it for purchase for about $20 cdn locally, still need to get it though.
_________________
3 928s, |
|
| Back to top |
|
 |
bruce76-924
Joined: 22 Feb 2007
Posts: 105
Location: Bradford, England
|
| Posted: Sat Nov 24, 2007 12:16 am Post subject: |
|
|
Thanks for that Raceboy!! Another good book on the subject is "Turbochargers" by Hugh MacInnes, published by HP books.
Bruce.
_________________
1976 924 LHD, full cage, semi tube chassis, 951 brakes, lightweight 951 body panels.
1.8t engine conversion with Holset turbo and 6 speed Audi gearbox. |
|
| Back to top |
|
|
morghen
Joined: 21 Jan 2005
Posts: 9069
Location: Romania
|
| Posted: Sat Nov 24, 2007 3:19 am Post subject: |
|
|
i'm reading it...will post when i have made my decision on what diameter and IC will use.....and explinations for that.
_________________
Supercharger and EFI kits
https://www.the924.com |
|
| Back to top |
|
|
morghen
Joined: 21 Jan 2005
Posts: 9069
Location: Romania
|
| Posted: Mon Nov 26, 2007 12:35 am Post subject: |
|
|
ok...got it...i read the intercooling section and i have this until now:
From the calculations it resulted to me that if i want an IC good for ~250 BHP using medium density and 10" long cores(i only have access to this type), the IC core will have to be 35cm long / 25cm tall and 7.5cm thick. I have also decided on the design of the i/o caps but i'm still thinking about using 2" or 2.5" pipes.
pushing 250 BHP with 2" pipes would result in ~290 ft/sec intake gas speeds while using 2.5" pipes would give one ~190 ft/sec gas sepeeds.
_________________
Supercharger and EFI kits
https://www.the924.com |
|
| Back to top |
|
|
RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
|
| Posted: Mon Nov 26, 2007 6:02 am Post subject: |
|
|
Morghen wrote:
| Quote: | | pushing 250 BHP with 2" pipes would result in ~290 ft/sec intake gas speeds while using 2.5" pipes would give one ~190 ft/sec gas sepeeds. |
Does that allow for the wall thickness of the pipes,? Usually 2mm for ally and 1.2-1.6 for stainless or mild steel. So the ID is 3 or 4 mm less.
Roger |
|
| Back to top |
|
|
morghen
Joined: 21 Jan 2005
Posts: 9069
Location: Romania
|
| Posted: Mon Nov 26, 2007 7:44 am Post subject: |
|
|
no the calculations refer to the usefull area....however the 2mm do not affect the flow in such a dramatic way...what i was interested more in was the difference between the 2" and the 2.5" profiles
_________________
Supercharger and EFI kits
https://www.the924.com |
|
| Back to top |
|
|
RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
|
| Posted: Mon Nov 26, 2007 8:11 am Post subject: |
|
|
| morghen wrote: | | no the calculations refer to the usefull area....however the 2mm do not affect the flow in such a dramatic way...what i was interested more in was the difference between the 2" and the 2.5" profiles |
Not being critical but a quick calculation shows over 17% difference in cross sectional area and therefore flow between 48mm and 52mm. May as well work it out realistically. Anyway, what size pipes are you going to use?
Roger |
|
| Back to top |
|
|
flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
|
| Posted: Mon Nov 26, 2007 8:50 am Post subject: |
|
|
2.25" like I suggested 
_________________
[This Space For Rent] |
|
| Back to top |
|
|
leadfoot
Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia
|
| Posted: Mon Nov 26, 2007 5:53 pm Post subject: |
|
|
match it to your throttle body...
Leadfoot
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress... |
|
| Back to top |
|
|
morghen
Joined: 21 Jan 2005
Posts: 9069
Location: Romania
|
| Posted: Tue Nov 27, 2007 1:52 am Post subject: |
|
|
hmm...this sounds right....whats the 931 S2 TB diameter ? 52mm ?
_________________
Supercharger and EFI kits
https://www.the924.com |
|
| Back to top |
|
|
RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
|
| Posted: Wed Nov 28, 2007 9:41 am Post subject: |
|
|
Raceboy or anyone else. Dont suppose you can give us a link to Corky Bell`s book "supercharged"?
Thanks,
Roger |
|
| Back to top |
|
|
Raceboy
Joined: 01 Mar 2004
Posts: 2326
Location: Estonia, Europe
|
| Posted: Wed Nov 28, 2007 4:10 pm Post subject: |
|
|
| RC wrote: | Raceboy or anyone else. Dont suppose you can give us a link to Corky Bell`s book "supercharged"?
Thanks,
Roger |
Sorry, don't have the link for it.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold 
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
|
| Back to top |
|
|
morghen
Joined: 21 Jan 2005
Posts: 9069
Location: Romania
|
| Posted: Fri Dec 28, 2007 6:17 pm Post subject: |
|
|
does anyone have some info on the 931 head flow numbers? max gas speed trough it...? i remember there was some talk about this a while ago..
_________________
Supercharger and EFI kits
https://www.the924.com |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
