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noob question---- blower setup
https://www.ausmini.com/forums/viewtopic.php?f=2&t=70675		 Page 1 of 1
Author:  estapol [ Thu May 12, 2011 8:54 pm ]
Post subject:  noob question---- blower setup
Hey all,

Just reading through a couple of posts on here bout s/c 12 setups,
wondering if im right in saying
blow thru system is:
air filter--->charger---->carby--->inlet
and pull through is:
airfilter---->carb----->charger----->inlet

or am I way off the mark.
Also whats the pro and cons of both setups??
I'm thinking the blowthru would be heaps easier for me to setup

Cheers Heaps
Hoba
Author:  Morris 1100 [ Thu May 12, 2011 8:59 pm ]
Post subject: 
Blow thru is easier but you have to have a carby that is designed to take the pressure.
Suck thru means you have petrol inside the blower and some blowers can't take it.
Author:  estapol [ Thu May 12, 2011 9:01 pm ]
Post subject: 
so would a dellorto dhla be designed to take the pressure
and if not do sc12 like the petrol??
Author:  man+van [ Thu May 12, 2011 9:01 pm ]
Post subject: 
And unable to run an intercooler on a suck thru setup
Author:  simon k [ Thu May 12, 2011 10:11 pm ]
Post subject: 
estapol wrote:
so would a dellorto dhla be designed to take the pressure
and if not do sc12 like the petrol??


SC12 is OK with petrol

main issue with putting a big blower like the SC12 or the BMW blower is space - the only really possible place is behind the head. There's no room for plumbing from an air filter to the blower then through a carb.
Author:  estapol [ Fri May 13, 2011 11:31 am ]
Post subject: 
what if I mounted it in front of the head??
surely there's enough space to route a couple of headers through to the carb
Author:  simon k [ Fri May 13, 2011 12:16 pm ]
Post subject: 
estapol wrote:
what if I mounted it in front of the head??
surely there's enough space to route a couple of headers through to the carb


maybe - I think I tried it once on a roundie and was too big, but the only thing holding you back is that you're stopping to ask the questions - get hold of one and give it a go :)
Author:  awdmoke [ Fri May 13, 2011 1:44 pm ]
Post subject: 
estapol wrote:
so would a dellorto dhla be designed to take the pressure?

Only the 45 dellortos fitted to the early Lotus 2.2L turbo.
Your average carby off an Alfa would need to be modified.
Author:  estapol [ Fri May 13, 2011 5:22 pm ]
Post subject: 
good point simon its just the $$$ getting in the way at the moment.
By modified awdMoke... how modified?? and what modified??
I read a thing on this forum somewhere about putting a copper ring somewhere in the carb to stop airpressure from blowing the fuel back through the jets.... or something along those lines
Author:  awdmoke [ Fri May 13, 2011 6:41 pm ]
Post subject: 
No idea on the specifics of the mods.
Your best bet would be to search on "dellorto" over on
http://www.turbominis.co.uk/forums/index.php

The other way I've seen it done is with the standard carby enclosed in an air box which is kept pressurised by the blower.
Author:  simon k [ Fri May 13, 2011 9:47 pm ]
Post subject: 
estapol wrote:
I read a thing on this forum somewhere about putting a copper ring somewhere in the carb to stop airpressure from blowing the fuel back through the jets.... or something along those lines


I think it's more along the lines of putting boost pressure into the float chamber to equalise the air pressure on both sides of the fuel tract

this might be the thread you're thinking of

http://www.ausmini.com/forums/viewtopic.php?t=69229
Author:  estapol [ Fri Jun 17, 2011 9:23 pm ]
Post subject: 
Just read up on the DHLA 40 mod.
Dellorto have a kit that allows the carby to take a boost line to float chamber to equalize pressure looks like its gonna be a blow through system.....
Will post pics of the finished modified carbie
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