blakep82
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| posted on 22/5/09 at 06:04 PM |
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twin 40, 45, and 48 carbs
whats the real difference?
seen a pair of twin 40s pretty cheap  engines a x20xev 2 litre job
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flak monkey
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| posted on 22/5/09 at 06:11 PM |
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Butterfly size.
40s are ideal for a 2 litre in moderate tune.
45s then for 2litre+ in seriously tuned form
48s and 50s for race engines etc.
Sera
http://www.motosera.com
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blakep82
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| posted on 22/5/09 at 06:13 PM |
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hmm so maybe a good starting point for my engine then? mine will be standard vauxhall form except the carbs and exhaust.
the ad just says they're on a ford cvh manifold, but doesn't say what size engine
cheers david
oh, and it says Twin 40 Dellorto side draft Carbs. how likely is it they might not be dcoe?
[Edited on 22/5/09 by blakep82]
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big_wasa
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| posted on 22/5/09 at 06:23 PM |
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I would do a bit of reading before parting with cash.
16v engines need more progresion holes than 8v ers. It can be hard to get a smooth idle.
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big_wasa
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| posted on 22/5/09 at 06:28 PM |
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But as you say at £125 they are very cheap  and you get the linkage, but no trumpets.
I would say they are a bit on the small size for your motor.
£25 postage is plent tho' 
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MikeR
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| posted on 22/5/09 at 06:31 PM |
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price up the bits you'll need to change to get them running.
they might be 40's but what size choke do they have - eg 40's might have a bit inside that takes them down to 32's.
getting them is only part of the cost
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prawnabie
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| posted on 22/5/09 at 06:32 PM |
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£120 actually lol
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blakep82
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| posted on 22/5/09 at 06:32 PM |
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the ones i've seen are £70!
linkage yes, no trumpets, and £25 post is a lot. as ever i'm having a nightmare with bike carbs and manifold etc, so i want something where
someone else has already done the work in designing the manifold etc, bolt together, job done even if it costs a bit more.
i can always look to go to 45's later if i want to though...
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blakep82
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| posted on 22/5/09 at 06:34 PM |
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anyway, you've all found them now, and will probably outbid me 
they do look like dcoe's don't they?
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big_wasa
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| posted on 22/5/09 at 06:40 PM |
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Yep they look like dcoe fit.
No I wont be bidding against you as I need a clear out not more.
Just wondered why not use the efi that your engine comes with ?
Must be loads of room in the truck for manifolds ? Fit and forget with good emisions and it must be 130bhp plus ?
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Volvorsport
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| posted on 22/5/09 at 06:52 PM |
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i would say 45's are a starting point for you motor
www.dbsmotorsport.co.uk
getting dirty under a bus
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blakep82
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| posted on 22/5/09 at 06:53 PM |
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you'd be surprised 
the original manifold is huge and goes right where the steering collumn goes, and i think it would hit against the chassis tubes where the engine
mounts are. plus all the efi wiring and injectors and stuff. all beyond me
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tul214
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| posted on 22/5/09 at 06:55 PM |
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How do you tell how many progression holes your carbs have?..........(Specifically Dellorto's)
Cheers,
Mark
1.6 Raw Super6 sold
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blakep82
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| posted on 22/5/09 at 07:03 PM |
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quote:
Originally posted by Volvorsport
i would say 45's are a starting point for you motor
you may well be right. looking at what david said though, my engine's completely standard, and at the minute, i just want something that will
work, and be easy enough to fit. i can always change them later.
what would be the effects of them being on the smaller side? lower power? i can live with that as long as it gets me running
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blakep82
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| posted on 22/5/09 at 07:05 PM |
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quote:
Originally posted by MikeR
price up the bits you'll need to change to get them running.
they might be 40's but what size choke do they have - eg 40's might have a bit inside that takes them down to 32's.
getting them is only part of the cost
the part that might take them down to 32's is removable though right?
i know i'll need other stuff too, like a manifold, qed sell ecotec ones for £95, i'm sure i can find cheaper elsewhere. trumpets i
don't mind buying, though they work (maybe not as well...) without them though right?
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cliftyhanger
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| posted on 22/5/09 at 07:37 PM |
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the chokes can be changed ie 32 to 34 which is probably the max for a 40dhla.
But be aware those changes can be ££££££ ie more to set the carbs up than they cost you. Best bet is to get them about right to start.
The des hamill book has a recommended jetting for a vauxhall 16V lump. He reckons 34mm chokes. The rets is really rolling road stuff but you can get
close. And DHLA carbs come in many varieties, you need to find out more info.....
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SPYDER
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| posted on 22/5/09 at 08:26 PM |
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I have SOLEX 40's on my 2 litre 16v Toyota 3sge engined kit car. They used to have 32mm chokes but I have machined these out to 36mm.
For road use I would say that 40's will be fine on your stock XE. I would imagine that Dellorto or Weber chokes could be machined to 36mm ( the
largest recommended size in a 40 carb)
My car has incredibly torquey midrange punch but admittedly does get slightly asthmatic at high revs.
Changing to 45's with even bigger chokes ( say 38mm) would restore the top end but could adversely affect the midrange.
If you are going to stick with a stock motor then 40's should be fine.
If you plan to raise the state of tune at a later date then maybe look for some 45's straight away.
The bolt pattern is the same for Weber 40's or 45's and is indeed the same for Dellortos and my Solexes.
See the following link for useful info.
Geoff.
http://www.fordcaprilaser.co.uk/weber_dcoe_carbs.htm
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blakep82
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| posted on 22/5/09 at 08:42 PM |
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thanks for the info guys, and the link geoff
why do these things have to be so difficult and confusing though 
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thunderace
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| posted on 22/5/09 at 09:56 PM |
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i have twin 40s on my golf with 32mm chokes that give around 35bhp
i have with my kr1.8 16v engine in my mk1 twin 45s as i need noor power i hope to get 200+bhp from it in my mk1 golf,biger carbs biger chokes = more
power up to a point .
Location Greenock: Home of the Lockerbie Bomber... great!
and swine flu
[Edited on 22/5/09 by thunderace]
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