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carbs
https://www.ausmini.com/forums/viewtopic.php?f=2&t=14144		 Page 1 of 3
Author:  floss [ Mon Dec 19, 2005 8:15 pm ]
Post subject:  carbs
I got myself Tuning the A-Series Engine by David Vizard for a Christmas present for myself and have been trying to understand and absorb some of the stuff in it.

Just a question on peoples thoughts on carbies? From what I understand in the book it seems that the weber sidedraft or the weber down draft carbs would be the best for power. Do you guys agree? The down draft carbs need holes cut in the bonnet and Mr. Vizard reccommended a scoop. The pictures he shows (page 85 fig 7.5 for those interested) has the scoop opening towards the windscreen. Is this to give smoother flow or is there something i am missing all together?

I don't have a mini at the moment. but am trying to save up to get one... just interested in learning a bit i guess.

Cheers
DaViD
Author:  kazjim [ Mon Dec 19, 2005 8:21 pm ]
Post subject: 
That area in front of the windscreen (The Plenum area on cars with little Grilles there) is a High-pressure area, so, a rear-ward facing scoop, should be able to pick up a little "Ram-Air" effect (Think 1960's Pontiacs and such- even the A9X Torana used this effect to its advantage...)

Good Luck
J
Author:  Morris 1100 [ Mon Dec 19, 2005 8:31 pm ]
Post subject: 
I think that Vizard moved away from the downdraught carby in his later books.
In my view, there are better ideas floating around here on ausmini than in Vizards books.
Go with a sidedraught Dellorto or Weber. :wink:

The reverse scoop is a great idea for removing oil from the engine bay and placing it on the windscreen. 8)
Author:  Mike_Byron [ Mon Dec 19, 2005 8:54 pm ]
Post subject: 
Quote - "The reverse scoop is a great idea for removing oil from the engine bay and placing it on the windscreen."

I presume then that you have spotless oil free engine and its simply a matter of whipping into a service station and just cleaning the windscreen



It was a joke
Author:  Lillee [ Tue Dec 20, 2005 10:51 am ]
Post subject: 
Sidedraft is noisy, smelly, not very fuel efficient and on the expensive side. That said, I love the sound, the smell doesn't bother me and the power increase is worth it.

That said, I have driven HIF44 cars and they go pretty hard as well, are much more quiet, cheaper (sort of), and are probably more fuel efficient.

It all depends on what you want out of your car. If you are going for all out power then by all means look into a sidedraft webber or dellorto. For your wife/girlfriend/mum's sake, they would appreciate the subtleties of a HIF44 :lol:

Clearance is no problem on a sidedraft if you install it on a Redline/Warneford 3inch(?) manifold there will be no/minimal firewall modifications needed.

Forget downdraft... this requires major body hacking :(

What is your budget? if you are thinking of buying a small bore (998, 1098) then sidedraft is probably too big/out of your budget. There are 101 other things that you can do to make the car go harder other than just carby upgrades...
Author:  gafmo [ Tue Dec 20, 2005 10:57 am ]
Post subject: 
68Delux wrote:
Sidedraft is noisy, smelly, not very fuel efficient and on the expensive side. That said, I love the sound, the smell doesn't bother me and the power increase is worth it.

That said, I have driven HIF44 cars and they go pretty hard as well, are much more quiet, cheaper (sort of), and are probably more fuel efficient.

It all depends on what you want out of your car. If you are going for all out power then by all means look into a sidedraft webber or dellorto. For your wife/girlfriend/mum's sake, they would appreciate the subtleties of a HIF44 :lol:

...


I'll agree on the HIF44 at the last Dyno Day thier was nothing between Mini mad and I but since I have the new manifold..I'd have him now :wink: pfft to that comment if you want all out power :lol:
Author:  Mini Mad [ Tue Dec 20, 2005 12:19 pm ]
Post subject: 
haha..but you don't have that bling sound little gafmo :lol:

Look at the results, i believe all the A-series that won the dyno shoot out were webber/dellorto fed :P
Author:  Lillee [ Tue Dec 20, 2005 12:23 pm ]
Post subject: 
Err Graham's 1400 is a HIF44 fed car? And brad's car is well... just fed!
Author:  Mini Mad [ Tue Dec 20, 2005 12:26 pm ]
Post subject: 
Ron beat Graham and it's got a Webber ;)
Author:  gafmo [ Tue Dec 20, 2005 12:40 pm ]
Post subject: 
hehe and that wasn't by much eather 8)
Author:  czerial [ Tue Dec 20, 2005 12:58 pm ]
Post subject: 
and whats the age difference between the two motors.... (i think
GRs motor is over 8 years old now amd a little tired....)

go the SU carbies... i love em
Author:  Lillee [ Tue Dec 20, 2005 1:05 pm ]
Post subject: 
Go the sidedraft carbies... I love em 8)
Author:  Mini Mad [ Tue Dec 20, 2005 1:15 pm ]
Post subject: 
My motor is about 8 years old too and i beat gafmo's fresh SU jobby :P

Hey, the webber/dellorto's might not have won by much, but they won. end of story :lol:
Author:  feralsprint [ Tue Dec 20, 2005 1:16 pm ]
Post subject: 
Horses for courses, nothing wrong with any of the carbs mentioned if properly set up, a well tuned Weber/Dellorto is just as fuel efficent as a SU and a SU will give almost as much power as a Weber/Dellorto but not quite. A Weber/Dellorto will give better low mid range resonse mainly due to the fact it has a accelarator pump and has 2 jets per barrel to control fuel flow accross the rev range. All leading race mini's use Weber/Dellorto's and the reason is they make more power but having said that there is nothing wrong with SU's its just what people like and you really can't beat the sound of a mini with a Weber/Dellorto

Jon
Author:  Mini Mad [ Tue Dec 20, 2005 1:19 pm ]
Post subject: 
^^^ what he said also 8)
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