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paledv
Samba Member
Joined: June 24, 2007
Posts: 14
Location: Norway
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 Posted: Thu Jun 28, 2007 1:45 pm Post subject: Weber jetting 1914 |
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Could someone tell me a good startingpoint for jetting.
dual Webers 40 Venturi 28
1914
044 ovalport 44/37
1.25 lifters
301 cam
009 distributor
Paal |
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clearsurf2001
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Joined: February 26, 2004
Posts: 1671
Location: Dave-AKA-fortyeye-Oceanside, Ca
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| Posted: Thu Jun 28, 2007 2:17 pm Post subject: Re: Weber jetting 1914 |
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| paledv wrote: |
Could someone tell me a good startingpoint for jetting.
dual Webers 40 Venturi 28
1914
044 ovalport 44/37
1.25 lifters
301 cam
009 distributor
Paal |
Mains-115 to 118
idles-50 to 52
air correction-200
F11 emulsion tubes
float level 11mm
fuel pressure-2.5 to 3.0 psi.
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Get ready for the injection 
| EverettB wrote: |
| Make sure it is coherent. Rodney |
| mharney wrote: |
I think Glenn has an EMPI crank in his engine. |
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paledv
Samba Member
Joined: June 24, 2007
Posts: 14
Location: Norway
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| Posted: Thu Jun 28, 2007 9:29 pm Post subject: |
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Thanks!
Paal |
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vwracerdave
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Joined: November 11, 2004
Posts: 15599
Location: Deep in the 405
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| Posted: Fri Jun 29, 2007 5:33 am Post subject: |
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You need larger 32mm venturies with your 40 IDF's on that engine. I don't know what a "301" cam is, but that engine might run better with 44 IDF's
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paledv
Samba Member
Joined: June 24, 2007
Posts: 14
Location: Norway
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| Posted: Sat Jun 30, 2007 5:33 am Post subject: |
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How do you think the engine will perform with this setup and carbs compared to a set of 44's or 48'?
The cam has a duration of 301 degrees and a lift of 11,68 millimetres. |
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vwracerdave
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Joined: November 11, 2004
Posts: 15599
Location: Deep in the 405
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| Posted: Sat Jun 30, 2007 7:30 am Post subject: |
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44 IDF's will make a noticeable improvement over 40 IDF's with 28mm venturies. The 40's will limit you to around 5000 RPM. The 44's will allow you to get the full RPM range out of your cam around 6500 RPM.
48's will work on that engine if it is for racing, but 48's are bigger then you need for the street.
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2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
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clearsurf2001
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Joined: February 26, 2004
Posts: 1671
Location: Dave-AKA-fortyeye-Oceanside, Ca
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| Posted: Sat Jun 30, 2007 7:31 am Post subject: |
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| paledv wrote: |
How do you think the engine will perform with this setup and carbs compared to a set of 44's or 48'?
The cam has a duration of 301 degrees and a lift of 11,68 millimetres. |
Will perform considerably better with 44 IDF's. If you haven't already purchased your dual 40's ... I'd say go with the 44's. 44's can be fitted with 38mm venturis, which would compliment your heads and cam nicely.
_________________
Get ready for the injection
| EverettB wrote: |
| Make sure it is coherent. Rodney |
| mharney wrote: |
I think Glenn has an EMPI crank in his engine. |
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paledv
Samba Member
Joined: June 24, 2007
Posts: 14
Location: Norway
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| Posted: Sat Jun 30, 2007 8:19 am Post subject: |
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| Thanks for the info guys! I've been told that dual 40 are the best choice for the 1914, but as I understand more about these things I see you are right. I alreade have the 40, but I think they will be easy to sell... |
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mharney
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Joined: June 01, 2002
Posts: 8353
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| Posted: Sat Jun 30, 2007 9:21 am Post subject: |
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| If you intend to keep power below about 5K RPM, 32 vents would be ok, and you'd be cheating that engine out of power, but you'd have great low end power! After that, you need about a 38 vent to get power at 7K if your engine has it in it (may, with that cam). A 36 vent would be pretty good to just over 6K RPM with that engine. If it were me and I were not drag racing all the time, I would pick the 36 vents first, and just see how it runs. |
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paledv
Samba Member
Joined: June 24, 2007
Posts: 14
Location: Norway
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| Posted: Sat Jun 30, 2007 10:54 am Post subject: |
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| Thanks, that was very useful information! Will there be much difference in jetting when changing vents between 32-36-38? |
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mharney
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Joined: June 01, 2002
Posts: 8353
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| Posted: Sat Jun 30, 2007 1:56 pm Post subject: |
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| Yes. |
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clearsurf2001
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Joined: February 26, 2004
Posts: 1671
Location: Dave-AKA-fortyeye-Oceanside, Ca
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| Posted: Sat Jun 30, 2007 3:00 pm Post subject: |
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Indeed.
_________________
Get ready for the injection
| EverettB wrote: |
| Make sure it is coherent. Rodney |
| mharney wrote: |
I think Glenn has an EMPI crank in his engine. |
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paledv
Samba Member
Joined: June 24, 2007
Posts: 14
Location: Norway
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| Posted: Sat Jun 30, 2007 3:04 pm Post subject: |
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Sorry, stupid question...  |
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The Man of All Men
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Joined: March 05, 2006
Posts: 202
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| Posted: Mon Jul 02, 2007 5:18 pm Post subject: |
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| paledv wrote: |
| Thanks, that was very useful information! Will there be much difference in jetting when changing vents between 32-36-38? |
I am using this advice to dial in my motor also so I just called my local shop for prices on these venturies and they told me about $28 a piece so I myself will be chillin with my 28 for now. |
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vwracerdave
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Joined: November 11, 2004
Posts: 15599
Location: Deep in the 405
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| Posted: Mon Jul 02, 2007 6:14 pm Post subject: |
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$28 each fir IDF venturies? They are raping you big time.
http://www.cbperformance.com/catalog.asp?ProductID=1156
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2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK |
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The Man of All Men
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Joined: March 05, 2006
Posts: 202
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| Posted: Mon Jul 02, 2007 6:25 pm Post subject: |
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AH dude that is sooooo sweet thanks for the website  Hell if that shop I called is selling them for that much I should buy them from cb and sell them at twice what I buy them for and still undercut the local competion. |
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paledv
Samba Member
Joined: June 24, 2007
Posts: 14
Location: Norway
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| Posted: Thu Jul 12, 2007 3:15 pm Post subject: |
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As it seems, it will be a while until I recieve a pair of 44's. So, I will try the 40 first. I am planning to use 34 vents and based on what I have learned, the right place to start is this:
Mains 130-135
Idles 50-55
Air corr 200
Emulsion tubes 200
Float level 11 mm
3 psi pressure
Do you agree? |
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mharney
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Joined: June 01, 2002
Posts: 8353
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| Posted: Thu Jul 12, 2007 4:03 pm Post subject: |
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| ffhofer wrote: |
AH dude that is sooooo sweet thanks for the website Hell if that shop I called is selling them for that much I should buy them from cb and sell them at twice what I buy them for and still undercut the local competion. |
Who wants to buy from a guy that is going to use nearly a 100% markup on an already retail price? You would really do that? |
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67Beetle2017
Samba Member
Joined: August 01, 2006
Posts: 399
Location: Pasadena CA
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| Posted: Fri Jul 13, 2007 1:55 pm Post subject: |
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| paledv wrote: |
As it seems, it will be a while until I recieve a pair of 44's. So, I will try the 40 first. I am planning to use 34 vents and based on what I have learned, the right place to start is this:
Mains 130-135
Idles 50-55
Air corr 200
Emulsion tubes 200
Float level 11 mm
3 psi pressure
Do you agree? |
Yeah for a starting point use: 40mm carbs 34mm venturis.
.55mm idle (.50mm w/28mm)
2.00 Air correctors
F11 Emulsion tubes
1.40mm mains (1.20mm w/28mm)
3 psi Fuel Pressure
You will probably end up with 1.80mm Air correctors and stepping down one size in mainjet.
28mm venturis will strangle you particular engine especially with those heads you list.
Mharney is correct, I had an 140Hp 1835 with 40mm carbs and 32mm venturis and the power was done about 6200rpm.
With a change to 44IDF carbs with 36mm venturis, the same engine would easily pull past to 6500rpm with much better (stronger) top end power. |
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Joel
Samba Member
Joined: September 04, 2006
Posts: 11099
Location: NSW Australia
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| Posted: Fri Jul 13, 2007 9:50 pm Post subject: |
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sorry to hijack but im having a similar dilemma
ive got a 1776 thats just had a topend rebuild
heads are stock, mahle 90.5 jugs no idea what compression is (no spacers or anything) and the bottom end wasnt split so i have no idea what cam is in it but its fairly tame, but it has 416C stamped on the gear
anywayz im running a single quiet pack and twin 40mm weber DCNs
they have 28mm vents and 130 mains, 185 airs and i've got 45 idles in atm and i think theyre the prob
it runs fine but doesnt pull to well under 2K if u give it some but over that goes well
the mixture screws are out 1.5 turns which seems abit much but i tried in some 55idles and 1/2 turn out but it seemed worse
i was thinking drilling my 45s to 50 but not sure as theyre OLD OLD carbs jets are getting hard to get
thanks
Joel
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1974 Germanlook 1303 2.5 Suba-Beetle |
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