ausmini
https://www.ausmini.com/forums/

custom weber manifold
https://www.ausmini.com/forums/viewtopic.php?f=5&t=50289		 Page 1 of 2
Author:  EAB [ Sat Feb 14, 2009 6:18 pm ]
Post subject:  custom weber manifold
hey guys i need a little advice. im putting a weber into frog and i dont want to cut in a firewall box.

my thought was to make up a custom manifold to get the carby/airfilter up out of the bonnet (to clear everything, making a new fibre glass one).

question is what's the maximum angle i can put the carby on with out any negative affects? or will it not matter too much, i'm thinking more about air flow than anything for the carby.
Author:  mini_mad_matt [ Sat Feb 14, 2009 6:43 pm ]
Post subject: 
I think you can get a really short manifold that will allow you to put one on without having to modify the firewall etc but from what i hear its not the best manifold.

Or you could get an ida weber and stick it vertical out the bonnet? hehe
Author:  EAB [ Sat Feb 14, 2009 6:52 pm ]
Post subject: 
i have the short manifold, gas flowed but i want to have some fun, and i did think about making it vertical . . . .:P maybe stick out a little far
Author:  mini_mad_matt [ Sat Feb 14, 2009 7:29 pm ]
Post subject: 
I think in one of vizards books there was a little section talking about using an IDA weber on a car and the advantages/disadvantages of it. But if you want to have some fun, its either going to be into the firewall or out the bonnet i reakon. But i dont know about putting the carby on an angle. But you drive up hills alright so maybe you could?
Author:  drmini in aust [ Sat Feb 14, 2009 7:30 pm ]
Post subject: 
I have been told that Weber DCOE sidedraft carbs don't like being more than 5 degrees or so from horizontal.
I also have a short Weber manifold on mine (Redline 3005, gasflowed) it is making 86.6HP at the crank, so it's not real bad. I'm running a Dellorto 45DHLA carby on it at about 9 degrees, these carbs don't seem to mind a little bit more angle than a Weber.
You could cut a hole in the bonnet and run a 48IDA Weber, NO it is not the same carby.

Here's a pic of ausmini member 1071's 48IDA setup...
Image
Author:  DarkenMini [ Sun Feb 15, 2009 12:51 am ]
Post subject: 
far out that looks like it would be great fun to drive around long winding bends
Author:  EAB [ Sun Feb 15, 2009 7:12 am ]
Post subject: 
that look awesome doc, ive used the pic and drawn in another possibility.

would this work ok and would it kill my throttle response? (too far from the inlet valves)

Image
Author:  Lillee [ Sun Feb 15, 2009 12:49 pm ]
Post subject: 
You don't need much to fit a weber under the bonet without mods. Do a search on Ausmini and you will find many people are running weber/dellortos without firewall mods and making a fairly big HP output.
Author:  EAB [ Tue Feb 17, 2009 7:58 am ]
Post subject: 
oh i have all the stuff do set that up with, short manifold gas flowed and short k&N filter.

Just want to try something different, test it and see what kind of difference there is. also a bit of fun making and designing all this stuff up for it.

our next experiment is a supercharged 998 using a turbo charger, :twisted:
Author:  smiling_simon [ Tue Feb 17, 2009 8:42 am ]
Post subject:  re: weber manifold
Really depends what your goal is - is this a race car or just a fast roadie? If it's the latter go with the 3005 redline. Port it and it will give you the best bang-for-buck of any weber manifold. Swan neck manifolds give you excellent throttle response but restrict flow at the top end. The 3005 is a good all-rounder.
Author:  mini7boy [ Tue Feb 17, 2009 9:26 am ]
Post subject: 
if you haven't already done so, you need to read this article by Graham Russell and follow it up with a phone call to Graham as needed. It is part of an excellent 3-part series of articles.

http://www.minimania.com/web/SCatagory/ENGINE/DisplayType/Technical%20Information/DisplayID/1892/ArticleV.cfm

Russell tests a VERY short manifold in his test with dyno results.

Note that his tests use both 40 and 45 Webers. The 40 tested just as well on the Swan Neck manifold as did the 40 on the Redline. The 45 only did slightly better than the 40 on the same manifold with the same 34mm chokes. Russell saves you the trouble/expense of doing testing on your own.

Russell is at: 61 2 9630 2195
Author:  drmini in aust [ Tue Feb 17, 2009 6:34 pm ]
Post subject: 
Graham Russell says the Redline 3005 when properly ported is good for up to 125HP and is fine for a roady.
His 5" RE one is better, but no way will it fit (with any filter) without butchering the firewall.
I fitted one to mine with stubstacks but NO filter for a track day, here's how little room there is... as you can see I had to trim the speedo hole just to fit the bare carby.
Image
Author:  EAB [ Wed Feb 18, 2009 2:14 am ]
Post subject: 
thanks doc, ive been checking out all the pics and that article of grahams is excellent. i've got the redline setup already, but just want to try somthing different.

really want to know what kind of effects having the intake facing forward will have?

anyway i will have a go at this next week and let you know how it all goes
Author:  drmini in aust [ Wed Feb 18, 2009 6:50 am ]
Post subject: 
I took the GR 5" one off and went back to the Redline with Ramflo/Unifilter, I noticed no difference in top end at all, but the GR one had just a little more midrange.
Mind you, this Redline has had about 9 hours die grinder porting (by me) inside.. :P
A stock Redline 3005 is OK for a 40 Weber, but they need a lot of porting to flow well with a 45. It is worth it. :wink:
This 45 Dellorto carby runs 38mm chokes, I get more power than with 36s in. Cam is an RE282 (now NLA).
Author:  DarkenMini [ Wed Feb 18, 2009 11:10 am ]
Post subject: 
u supercharge and turbo charge? that sounds very scarey kinda like cooking with a 1950's high heat pressure cooker(stay away This relic could blow at any moment)
Page 1 of 2 All times are UTC + 10 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/