Weber rebuilding, tell me something Options

[Trekkor]

I'll be rebuilding the carbs on my SIX next week.

I wonder if I should do internal baffling while they're open.
What are the benefits to this mod? Perry, Gint, JP, Brad, Lawrence, Sean, Root?

Any other advice ( besides keeping the four ) would be appreciated.

KT

[McMark]

Yes, you should, it's easy and fairly quick. You also get to do some "custom metal work". (IMG:style_emoticons/default/biggrin.gif)

I have the cutting burr you need to get into the tight places.

[Trekkor]

Soooo....tell all.

KT

[J P Stein]

I've never had the need for the baffle mod (this is a rerun). I would do it if I ever get starvation problems, not likely at AX....maybe I ain't pullin' enuff G's. I'll work on that. (IMG:style_emoticons/default/biggrin.gif)

Good things to do:

Anti-precolation mod.
The thick insulators under the manifolds.
PMO can fix you up....may as well get the rebuild kits there while your at it.
Tall secondary venturi....Helps the mid range torque, I'm told. Mine have em'. Dunno if they do any good, but they look cool (IMG:style_emoticons/default/biggrin.gif)
You'll want a Syncrometer & float gauge.

Learn the Weber dance (IMG:style_emoticons/default/mueba.gif)

Pay somebody that has their shit together to show you how, if necessary.

[Joe Bob]

THROTTLE SHAFTS...HOW ARE THEY?

[Eric_Shea]

(IMG:style_emoticons/default/agree.gif) with JP

[McMark]

I'm worried about the throttle shafts as well. I'll show you the baffle when you've got it apart and you can decide. It's a picture. thing. I think there was a thread about it awhile ago. I'll search for it.

Here it is...

[ArtechnikA]

you've got a SIX now, you need to go buy more books...

JP's pretty much got the list; i never saw the need for the baffles either, and he's lots faster than i ever thought of being. maybe that's the key - finish the course before the float bowls run dry!

anyway - in '911 Performance Handbook' they show removing an 'anti-sediment' boss at the bottom of the float bowl that also helps with pickup issues. the percolation mod is important nowadays.

i definitely agree on the 906 preatomisers.

i ran a set of slightly larger venturiis, jets, and emulsions on my car - some day i'm gonna hafta open it up and see what 'the kit' consists of really ...

[Gint]

(IMG:style_emoticons/default/agree.gif) with all of the above. 'Specially JP. Mine WILL be going to Erometrix for a full rebuild and throttle shaft rebush. My shafts (housings anyway) are shot. I have the carb insulator blocks, will do the perc mod, but that's about all for mods.

Check the shafts!!!

I have at least one Weber dance procedure around here. Seems like I had one from Carl Cilker and one from someone else (I can't remember who off the top of my head). I'll see if I can dig 'em up later tonight. Gotta go to work for most of the day.


JP, How tall are the "tall" secondary venturis anyway?

[J P Stein]

Bout this tall (IMG:style_emoticons/default/biggrin.gif)

[J P Stein]

I've never been able to tell fer sure that the shafts are too far gone....but I've only run 2 sets of 3 barrel Webers.
From what I can gather, they're not too far gone till they leak so much air that you can no longer tune the hole (usually 1 and/or 4). All them springs in front cause the wear.

I'm not positive, but think that the later IDAs have a teflon(nylon?) bushing at the front ends of each carb (1&4).
This can be replaced fairly easily. IDTs ....no bushing..at least not on the set I had....you're screwed, Gint. Having this repaired is NOT CHEEP so I wouldn't do it "just because you're there". (IMG:style_emoticons/default/biggrin.gif)

[Eric_Shea]

ToB... thing of beauty (IMG:style_emoticons/default/smilie_pokal.gif)

Even the engine compartment is 1/2 primer (IMG:style_emoticons/default/w00t.gif)

[Gint]

From what I can gather, they're not too far gone till they leak so much air that you can no longer tune the hole (usually 1 and/or 4). All them springs in front cause the wear.

That's exactly what I've got. Couldn't get that pig to hold a consistent idle to save my can. It made it a real PITA to get it smogged. It would keep dropping from 1100 (high specifically for the test) to 600. Then it would load up and fail. I won't screw with 'em anymore. They're going to Eurometrix.

[Trekkor]

The carbs are off the motor and in my shed now.
I'll break 'em down in the next day or two.

Rebuild kit will be here on Mon or Tues. (IMG:style_emoticons/default/clap56.gif)

JP, you say no to the baffling.
Has anyone ran into problems that baffling fixed?
I'll do it if I need to- only if I need to.

Remember, I a/x one time per month.

KT

[J P Stein]

I don't say "no".
I said I haven't needed it.
I got nuthin' against it.....other than the chance of boogering up your carbs. I think someone had a problem with that.

I'd do it if I found it necessary.

[Trekkor]

JP, I guess what I'm asking is, "Do I need it? ".

KT

[ArtechnikA]

The carbs are off the motor and in my shed now.
I'll break 'em down in the next day or two.

Has anyone ran into problems that baffling fixed?
I'll do it if I need to- only if I need to.

rebuilding: do one side at a time. there are places where it can be really handy to have one done right to compare to ...

baffles: there are two approaches on race prep. one says do everything you know about when it's convenient because it will never be easier and then you'll -know- you're ready, and you won't lose an event due to something left undone - especially, if it's something you knew about and decided not to do.

the other approach says there is never enough time nor money to do everything that needs doing, so first concentrate on the places where little investments have big payoffs -- the "low-hanging fruit." then address the things that need addressing when they rise up the priority chart.

'best' is probably somewhere between. i never needed a baffle fix for fuel starvation - but i never AX'd my /6 on slicks, and the street tires available to us then were nothing like today's. JP's said he's never seen a starvation issue, and he's running both slicks -and- a big engine. but maybe the courses available to him don't have the kind of long, high-g sweepers some of the CA courses have.

you won't know if you -need- it until you start dropping a bank on a long, tight sweeper. if that costs you a class win, you'll be pissed. are you running within a tenth of the class leaders now ?

my guess is you won't -need- it until you've got the rest of the car sorted and have learned to drive to maximise its potential - by which time, you'll probably be ready to take the tops off again - maybe to adjust the float levels (do you have the sight gauge ?)

[J P Stein]

(IMG:style_emoticons/default/agree.gif)
Rich has said it better than I could....which ain't all that hard (IMG:style_emoticons/default/laugh.gif)

One of the keys is setting the floats at the proper levels.
I've never had the guts to set em' with the engine running, but have come up with a way (prior to installation of the carbs) that works for me....one of them typical backyard mechanics deals.

I also agree with one of Rich's prior posts on getting Anderson's book (maybe even Wayne's) and would add a book on Webers to that.
Weber Carburetors by Pat Braden seems to be a pretty good one. One can study the basics there.

Also, look at the bird board's engine rebuild FORUM. There are some real live 9eleben engine gurus that post there. Lotso good stuff can be found by doing a search, but (IMO) it's not a replacement for good books. Type in Webers and you'll be inundated. (IMG:style_emoticons/default/biggrin.gif)

[Trekkor]

Rich, JP, I can see that these Weber dance lesson are gonna pay off! (IMG:style_emoticons/default/mueba.gif)

I still need to learn the tunes and keep the beat first. (IMG:style_emoticons/default/rock_band.gif)

I'll be in the studio.

KT

[Trekkor]

O.K.- tonight's the night.

I'm going out in the shed to break 'em down.

Number one reason to stay home from work on Monday?: you'll miss the Weber rebuild kit deliverd by " Priority mail" (IMG:style_emoticons/default/headbang.gif) .

Oh well, my wife'll get for me tommorow.

KT