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Thu Jun 30, 2016 9:59 am

I just purchased a 40 idf weber with 28mm venturi, 1.6 air correction, 1.45 main, .50 pump & .65 idle. The carb is going on a 1914 with aa pistons, standard heads/valves/springs, crowed 61004 cam. Is anyone running a 40 idf on a similar setup? If so, what size jets/venturi are you running? I don't have the motor running yet, I hope to have it back together and back in the car this weekend so I can't say how it runs now. Thank you

Thu Jun 30, 2016 10:08 am

Sounds too rich! Is it going in a bug?

Thu Jun 30, 2016 10:13 am

Yes, 74 super. Thank you. What would you suggest. This is a center mount, these are what came with the carb.

Thu Jun 30, 2016 1:34 pm

Yeah, Center Mount it may be ok. I don't know I just have tried my first center mount on a pretty much stock bus engine with a Zenith 32 and it has 25mm venturi's I think small venturi's is right on the center mounts. I will be watching your thread myself for input!
http://www.aircooled.net/ has some info about what we are doing.

I just looked up your cam here: Crower 61004 Sounds like the car will be a little difficult to get going in but once you have the rpm up it's going to really take off. Try Search above, I found this thread searching for "IDF Center Mount" Many others too. Weber 44 IDF Center Mount on a 1600 Jetting Question.

Thu Jun 30, 2016 5:59 pm

I am very excited to get my bug back on the road. I picked up the heads and case from the machine shop last week. Dune buggy Supply in Hopkins MN. Sam does great work, quick, priced fair, can get or has anything you'd want and is willing to help you out. Two thumbs up! Anyway, I am hoping I will get my pistons this weekend, I should have some free time. I can't tell you how the cam runs, I've never had it in a motor. I was running dual kadrons but I am no carb expert, I never had them dialed in that we'll. I'm hoping this weber works out a little better, but again, I'm no expert. I have searched but didn't find anything with something similar to what I'm running. So any input would be appreciated.

Thanks

Fri Jul 01, 2016 4:27 am

I have done a good amount of searching and can't find any information for a single weber on a 1914 motor. I hope I didn't make a mistake in picking thè weber up.

Fri Jul 01, 2016 12:44 pm

You can always get another one and run dual 40 IDF Webers which is a very good combination (would have better torque down low and be easier to tune). But why not figure it out with this one first. Do you have the intake manifold and heat riser tubes? How set are you on that cam? It's Kind of odd with so much more exhaust lift! (Your stock valve springs, AA pistons etc won't be able to take advantage of it.)
The thing I realized when I got my centermount set-up is that there is a big difference in running a Plenum manifold (One that has a single opening) VS the separate intake runner manifold (Photo Below) which is probably what your using with the IDF. If you have 28mm venturi's and have one of them on 2 cylinders then that's really different than having two 28mm venturies together feeding all 4 cylinders as with the Plenum manifold. Cylinders take turns firing and with a plenum manifold there is a lot more flow potential probably twice. How this effects jetting etc... I don't know. You do see these IDF's centermounted it's common and it's nice looking. Centermount Weber IDF, About Pre-Heat, Why do I need to heat a center 2 bbl carb setup?, Weber Gurus, Need advice om single IDF 40, Most of the threads that come up when I do a search for "centermount" talk about how inportant it is to have good pre-heat. This too is sopken of in John's AirCooled.Net articles but under Weber Progressives Centermount. Searching for "Single IDF" yields these threads that have valuable info. Need help jetting single weber 44 idf 1760cc, Single Weber IDF for 1600 Dual Port, single 40 idf on a manx clone?, Single Weber 40 IDF on 1600 has Poor Throttle Response, 1 5/8 exhaust and Single 44 IDf Weber carb issue/question?, and so on.

IDF Centermount Seperate intakes:

And here is a Photo of my Zenith Carburetor on the RaceTrim Plenum Manifold.

Sun Jul 03, 2016 3:20 pm

I do have a budget and would like to save all the money I can. However, if I don't get a second carb, I will always think about the difference it could make. Yes, the manifold does have the heat risers. The manifold is a empi, it's brand new, unlike the carb. I have read that it is better to have a manifold that does not have the risers. Can those be welded? I'm really not stuck on anything, like everything else with the motor, the cam was a deal. I didn't pay much for it so I wouldn't think twice about picking up another one.

Yes, I have the separate intake runners. I've actually never seen anything other that would fit a weber. It would have still been one barrel for 2 pistons, I am more of a weber fan.

Thanks for your response. I do appreciate the information, it have been very helpful.

Sun Jul 03, 2016 3:40 pm

If you don't have a reason NOT to use duals, then for the love of god get duals.

Mon Jul 04, 2016 10:48 am

So "tmandile" back to your original statement: "standard heads/valves/springs, crowed 61004 cam" Probably need to think about this a moment and make a decision of whether to build your motor to work with this cam or to change the cam to something that would have better low end torque and less high. Cause standard heads/valve/springs won't be able to rev up nearly as high as that cam is designed to operate. I would think that Crowed 61004 cam with it's high lift exhaust valve:
Crowed 61004, Volkswagen - Type 1 & 3 Air Cooled
Performance level - Original - Fair idle. High torque profile with emphasis on the top end for 1800cc engines and under.
INT/EXH - Dur @ .050” Lift: 244°/252° RR: 1.1/1.1 Gross Lift: .424”/.446” LSA: 107° RPM: 2000 to 7000 Redline: 7500
would need dual valve spring heads or at least Single HD springs and stronger than stock pushrods. There are some aluminum ones out that are pretty nice. Also I would not want to depend on AA pistons to rev much above 5000 rpm.
The way you have things you would be leaving a lot of performance un-tapped! Probably need to ad a Rev-Limiter so you don't float the stock valves! (Stock valve springs are amazingly weak!) But with it being a larger 1914cc it probably won't rev much past 5000 with that cam anyhow. What kind of crank and rods does it have? I would want a counterweighted crank and H-beam rods, however people do successfully use stock cranks at higher rpms. (It's a little rough on the case.)

Mon Jul 04, 2016 4:33 pm

Would it be better to run a stock cam than the Crowed? I know the AA pistons are not designed to rev high, I'm aware they are on the budget end of the spectrum. I did find the manifolds for a dual weber setup, now I need to find another weber carb. I still do have a little time, I am still waiting on my pistons, the order should come in the 6th. Everything else is stock; crank, rods. I appreciate the advise and I am glad I asked.

Thanks

Mon Jul 04, 2016 4:40 pm

Would a Engle 110 be a better fit for my setup?

Mon Jul 04, 2016 5:24 pm

tmandile wrote: I was running dual kadrons but I am no carb expert, I never had them dialed in that we'll.
Sorry to say, but I am guessing that if you could not get the Kadrons to run correctly, you will have yer hands full getting a single Weber to run right.

Do you still have the Kadrons?
They frequently have factory defects that can be easily detected and remedied during a rebuild.
Mine had a gasket for the needle/seat that was oval shaped and not sealing . . . that carb looked like a fireplace chimney down the throat . . .
The other carb had a loose accelerator pump nozzle, so it was not much better . . .
I believe what the seller told me about the Kadrons having less that a hundred miles on them . . . I'm surprised it ran at all!

If it were me . . . rebuild and run the Kadrons until you are able to locate a matching 40 IDF and run them as duals.

The last time I found IDF Webers on C-list, they were like the one you are selling . . . single carb on a single manifold . . . and cheap!

Mon Jul 04, 2016 6:00 pm

Great! I don't have the kads, I could get the kads back but I already have a 40 idf, 44 idf & the manifolds for a dual setup. I'm obviously not going to run them together but I should be able to find one soon. Anyone interested in the crowed cam? I will list it on classifieds l, I only need 40$ for the cam and gear.

Thanks for your input.

Mon Jul 04, 2016 7:00 pm

So you have not put the bottom end together yet? Yeah, the W-110 probably it's kind of the standard, What is it: 247'@50 and .430 lift
Compare that to the Crower, its: 244@50 and a .424/446 lifts
Web-cam grind #118 ***** *** 246@50 and a .456 lift
First two cams are both going to need a performance valve train, the Crower is actually tamer than the W-110. I am running a Webcam grind #118 in my spare bus dual carb engine with stock pushrods single HD valve springs and I jack it up to over .456 " of lift with 1.25 ratio rockers.
Ok here they all are : I think you could still have some RPM with the webcam #118 with a stock engine keeping with stock ratio rockers. (Get Solid Rocker Shafts and ball adjusters, good ones "Scat" or something) It would handle a few high rpm's It's not going to have as much torque as yours though.

Mon Jul 04, 2016 7:37 pm

No, I have not done anything except gather incorrect parts. I have the case and heads machined but I'm waiting for the pistons. I should have asked done more research before jumping on the cheapest parts.

Thank you for your advice.

Mon Jul 04, 2016 8:17 pm

modok wrote: If you don't have a reason NOT to use duals, then for the love of god get duals.
"modok" I really wanted to hear one of your good dissertation's on just how to use "tmandile's" Crower 61004 with the Single IDF.

Crower 61004
284º 244º 0,429" 10,90 107º Dual lobe; up to 2180cc; 2000-7000+rpm
290º 252º 0,452" 11,48 107º

Mon Jul 04, 2016 9:25 pm

It sounds like a 110 shouldn't be run on a stock valve train either. What is a good cam? I know my topic has jumped all over, I apologise.

Mon Jul 04, 2016 9:44 pm

I actually like the crower split cam for some things.
The split will work well with superchargers, heads with low exhaust flow in comparison to intake, max CC with heater boxes and stock size valves, and might even make very good power with the single IDF using big vents, but not good for a daily driver application.

The single idf needs a milder cam to have good idle and low speed manners.
cb cheater or engle 100, or something in between.

Dual IDFs the crower cam would be ok, close enough I would not change it but do check the timing. I think it needs to be advanced a few degrees, or at least checked to see where it is.

What are we going for here? Tractor, offroad? street? highway? whatever is most fun?

the only time I use stock springs is charity builds, stock cams. I did weld a bunch of stock valve springs to the bottom of a lawn chair and make it into a rocking chair, and they do very well for that. My brother did break one spring but he is kinda heavy and clearly rocking too hard. I welded on another and they still working great.

Good cams and HD springs on everything! Springs are CHEAP! cams, well, money well spent.
So, my advice, if you use that cam, is get some HD valve springs, HD pushrods, Better lifters, and a supercharger, or dual IDFS.

If you want to use any single carburetor, switch to milder cam. cb cheater to engle 100.
Will need HD springs but stock pushrods will work. I'd say return the empi manifold if you still have the receipt, but it may work ok. What size tubes? What works for me, is the CB low profile manifold and change it to 1 3/8 tubes and 28-30mm vents. If the manifold is 1.5" OD tubes, then you need a 32mm vent to match. Can the carb function with 32mm vents? maybe, maybe not. It's iffy. the 44idf probably can work but will be just as hard to jet possibly worse.

Or something, I don't know what you want to do. Neither do you! Think about it and then we'll narrow it down.

Tue Jul 05, 2016 5:58 am

Thank you. I appreciate the advice. I will look into some HD springs, it sounds like it would be a mistake not to get some. What do I plan on doing with the car? Have some fun. It won't be a daily driver, maybe when I get home from work. It was something I picked up to wrench on and learn a little while I was at it. I did order a set of manifolds yesterday, so all I need is a additional carb. What about a scat 20005 cam? I'm learning here but it looks like it may be in between a 100 and a 110?