Jump to content

  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

  • Help Support FAQ and Upgrade Your Account!

Weber 32/36. Jetting. Again.

GreenSwede

By GreenSwede
in BMW 2002 and other '02

 Share

Recommended Posts

GreenSwede Experienced

GreenSwede

Posted
Posted

Again. Running a weber 32/36 on a stock 2002, only thing is TEP headers.

 

Jets as CD´s prescription, almost.

 

CD´s Primary - idle 60 main 140 air corr 145

My primary -    idle 55 main 140 air corr 145

 

CD´s secondary -  idle 55 main 170  air corr 175

My secondary -     idle 55 main 165  air core 165

 

Checked float - 40mm. Acc pump squirts, seem fine.

 

The car hesitates on throttle, catches breath, stumbles - before taking off. Seems like it spits and gurgles.

 

Runs better and smoother on light throttle, ok low end.

 

On heavy throttle in 1st gear from standing still it really bogs.

 

And, the exhaust is always black of soot. Cleaned it up the other day and totally black again after a run. Starting with choke, of course, but ran it hot an quite hard after that. 

A thought, maybe stupid, is that since I run a 2" exhaust from the headers, but installed a 2,5" pipe straight out from the rear muffler maybe the flow in the exhaust isn´t enough to keep it clean.. And I might be running rich.

 

I do have an AFR waiting to be installed, but I haven´t got the time to install it right now and I´ve got a track day next week. Too much of a hesitation shift the weight of the car a bit too much on the way out of the bends..=)

 

Any thoughts appreciated. And, I´m sorry to bring this jetting thing up again.. I might just go 38, it seems easier, somehow.

Ola Gustafson
Sweden
-------------------
1975 Taiga Euro 2002 3685483 - Weber 38/38 DGMS - Pertronix Ignitor - H&R Cup Kit - TEP headers and Simons 2" sport exhaust - 3.91 LSD.

Link to comment
Share on other sites
allbim Mentor

allbim

Posted
Posted (edited)

You may have a faulty power valve assembly. Make sure your manifold is heated or you will still have some stumble (hesitation) even when the carb is perfect. Although I don't think this is your problem right now. Keep us up to date.

Edited by allbim

No amount of skill or education will ever replace dumb luck
1971 2002 (much modified rocket),  1987 635CSI (beauty),  

2000 323i,  1996 Silverado Pickup (very useful)

Too many cars.

Link to comment
Share on other sites
GreenSwede Experienced

GreenSwede

Posted
  • Author
Posted

You may have a faulty power valve assembly. Make sure your manifold is heated or you will still have some stumble (hesitation) even when the carb is perfect. Although I don't think this is your problem right now. Keep us up to date.

 

 

ha.  you beat me to it.  Power valve.  The rubber diaphraghm can stick 'on' leaving the valve open all the time.

 

Try lowering your float level 2 or 3 mm.  Just for kicks. 

 

t

 

Well, I do have a brand new diaphragm in a box.. Will replace.

 

And that darn manifold. Bought the weber and manifold as a kit, and one thing was that I should remove the bottom "lid" for the heating from the stock one and put that on the new one, but it didn´t fit.

I seem to remember it was smaller on the new manifold (year model? E21?). So I´ll have to find the stock one and hog it out. It´s on the list, but again - time! Will see if I can find some more and sort that as well.

 

Thank you very much for the replies!

Ola Gustafson
Sweden
-------------------
1975 Taiga Euro 2002 3685483 - Weber 38/38 DGMS - Pertronix Ignitor - H&R Cup Kit - TEP headers and Simons 2" sport exhaust - 3.91 LSD.

Link to comment
Share on other sites
GreenSwede Experienced

GreenSwede

Posted
  • Author
Posted

Might want to try backing out the fast idle valve (between the choke and accelerator pump) ever so slightly. keep trying that until the hesitation goes away.

 

Hm.. You´re talking an electric or water choke carb now, right? Mine is manual, and I don´t recall seeing that valve(?).

 

 

dgvskiss1.jpg

Ola Gustafson
Sweden
-------------------
1975 Taiga Euro 2002 3685483 - Weber 38/38 DGMS - Pertronix Ignitor - H&R Cup Kit - TEP headers and Simons 2" sport exhaust - 3.91 LSD.

Link to comment
Share on other sites
GreenSwede Experienced

GreenSwede

Posted
  • Author
Posted (edited)

You may have a faulty power valve assembly. Make sure your manifold is heated or you will still have some stumble (hesitation) even when the carb is perfect. Although I don't think this is your problem right now. Keep us up to date.

 

How do I check the power valve?

 

Edit: Found it - push and suck - if stay put = ok.

Edited by GreenSwede

Ola Gustafson
Sweden
-------------------
1975 Taiga Euro 2002 3685483 - Weber 38/38 DGMS - Pertronix Ignitor - H&R Cup Kit - TEP headers and Simons 2" sport exhaust - 3.91 LSD.

Link to comment
Share on other sites
GreenSwede Experienced

GreenSwede

Posted
  • Author
Posted

And those days one feels quite stupid.

 

Misunderstood "power valve", lingual error and thoughts stuck on diaphragm - thinking "accelerator pump? It´s almost brand new and doesn´t drip or anything.. Naw.."

 

Anyway, I just checked the power valve, a diaphragm I did not know I had, actually. It didn´t seem to stay put when sucking on a hose pressed to the corresponding hole, so I took it apart. Thought it looked a bit saggy and bad, but put it back to tried again - and now I could suck it down and hold it there. Will reinstall and try. (And order a new one and put in the box of goodies for days to come)

 

Also, the real stupid part, I checked the plug of the secondary enrichment hole (as in CD´s prescription), and it wasn´t sealed properly. I could blow a stream of air through the enrichment tube backwards.. Did it again and (hopefully) got it right. 

 

Now VERY eager to put the lid back on and try it tomorrow. If it works I´ll be happy enough to forgive my own stupidity.

Thanks all for responses and thoughts. (And I will get a heated intake manifold as well)

Ola Gustafson
Sweden
-------------------
1975 Taiga Euro 2002 3685483 - Weber 38/38 DGMS - Pertronix Ignitor - H&R Cup Kit - TEP headers and Simons 2" sport exhaust - 3.91 LSD.

Link to comment
Share on other sites
GreenSwede Experienced

GreenSwede

Posted
  • Author
Posted (edited)

Great, now I'm having the same trouble mentioned in your original post. Did it also sometimes backfire when trying to go wide open throttle? That means it's lean... and it is doing it to me.

 

Almost backfired. Especially when damp and cold.

 

Although it seems most people here seem, if anything, the CD-prescription a tad rich. And my exhaust is, as said, black as the rear of a chimney sweeper.

Test run to night, will get back to you.

Edited by GreenSwede

Ola Gustafson
Sweden
-------------------
1975 Taiga Euro 2002 3685483 - Weber 38/38 DGMS - Pertronix Ignitor - H&R Cup Kit - TEP headers and Simons 2" sport exhaust - 3.91 LSD.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t

  • I don't like ads!

    I want to support the FAQ!

  • Upcoming Events

  • Supporting Vendors

  • I don't like ads!

    I want to support the FAQ!

×
×
  • Create New...