CIS or Webers

[pookie]

I was thinking about ditching my CIS and going with Webers. Car is a 76, motor is a 81 3.0 straight headers into a 2 in 1 out stock muffler soon to be a 2 in 2 out aftermarket (haven't decided what I am going to go with yet). From internet research it looks like webers might provide a pinch more power, but are they more of a hassle than the CIS? I mean aside from the weird fog idle in my other thread this morning I've (knock on wood) not had issues with the CIS. Once tuned can I expect the webers to stay that way or will they requre constant fiddling?

Thanks

[smdubovsky]

Coming from a guy (me) learning to rebuild/jet/etc webers: They are FAR more trouble than CIS. Coming from a good friend who has them on his daily driver: they are mostly set and forget. Both of us are correct. Setiing up the webers is a real pita unless you're already an expert but once they are "right", as long as you keep the fuel clean, then are mostly set and forget.

Dont forget you will need to recurve the dizzy and your fuel economy will tank. It all costs a lot more than it looks too - things add up. If you're just looking to tinker then it might not be a bad plan, but I would suggest going an EFI route if your just looking to burn a couple grand. It does it all. Or, for your same couple grand, sell the 3.0 and get a 3.6...

Im going to give my /6 one good honest attempt at getting the webers right (no one on the west coast apparently could). If (when?) I admit failure, its either getting EFI or Im selling the whole motor and putting in a 3.6;) Its a tossup on cost.

SMD
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[Dr K]

How much is a 3.6 (crate)? Where would you get one?

[smdubovsky]

There is a guy on pelican selling a rebuilt early 3.6 complete w/ brain and harness for $6500. I've seen them go from $6k-$9k. All depends on the year, mileage, and accessories included. Timmons also sells them and has a good worksheet calculator on costs.

Now ask Bill Miller, it takes more than just a motor (flywheel, plumbing, front cooler, etc). But, depending on how much you can do that on the cheap its close on cost. Its REALLY close if you already have things like headers and the front cooler.

good running 3.0 = $4k?
Webers used are $1500+ for pump, regulator, manifold, linkake, etc
PMOs are $3200 + pump.
EFI is somewhere between the two if you DIY (or WAY more if you go high end)

If a 3.6 can be installed for $8k(DIY), thats not far off the sunk cost you'd have converting the 3.0L + induction. Lots mo' torque & hp and turn the key and drive type reliability. Now, converting to a 3.6 isn't as easy but its not impossible. A few here have done it and I understand Bill is writing a book;) (Well, he better be taking good notes)

SMD
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[markwemple]

Or sell the beast and spend the extra $$ on an early 964 and forget the swap headache. Pull all unnecessary stuff and the car will almost be as light (ok, so not almost) but you'll have fewer headaches than the swap.

Man, there is no cheap way to get extra bhp in a normally aspirated 911!

[smdubovsky]

Mark, only one problem: ;)
1977 911S = historic (cheap plates, cheap insurance, no inspection, no smog).
1990s 964 = 10+ more years to go (and they may limit the cutoff date like they did in CA between now and then)

SMD
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[sccaracer]

I've had Webers on my 2.4 (E cams/ S pistons) for about (too long). Once they were set correctly, they pretty much stayed set. Cold mornings they pop a couple of times untill they warm up, but after they they purr. Now if I could only find the oil leak.

[racer]

What's wrong with the CIS? Why the need to change?

To get the most out of carbs, you would also want to make a cam change. hmm.. more $$ to add to the pot.

Having come from a Carbed 914 to a CIS 911, I can't believe all that I put up with. Trouble running in the extreme heat (especially in stop and go city driving in 90+ degree days), the cold, having to pump the gas before starting.. blah blah. Decreased fuel mileage. CIS- turn key. start motor. done! Hot? no problems. Cold? no problems.

I would have the CIS gone over, keep it, and put money towards other things on the car (assuming something needs upgrading as well ;) )

[Rick V]

I am a big fan of the CIS, I like the turn-key usage you can get from the system. (Lanna isn't my first CIS car) If your CIS is working or just needs some TLC I would keep it and be happy.
I do love the sound the carbs make while using a fair amount of foot! Just can't beat it. :)
Are we just kicking around some ideas or are we getting ready to spend? I like spending (your money), how may I help?

[pookie]

No just kicking around ideas...the majority of threads I have seen on other boards guys are always switching the CIS for Webers, never heard of anyone wanting to switch webers for CIS so I figured I would ask before hand. It's not so much that I don't like CIS I just want what is best for my car. Horrible gas mileage with webers is something I didn't know about.

[EvilBunny]

keep the CIS, webers are awesome, sound is cool, makes a bit more top end,etc. but it's jsut a PIA having to get them setup if weather goes in a different direction suddenly, or something gets out of place..and you have no idea hwo to mess with and then do,etc. not saying you would.

besides, CIS is very turbo friendly system ;) :knudge-knudge: