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Sept 2, 2006 12:49:35 GMT
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I've run Webers for years and never had any problems with them at all. As long as the carbs are in good condition they will serve you well. They will never be as efficient as injection or bike carbs but develop good power and are easy peasy to fiddle with. The loss of power at the bottom end and the spitting is a complete myth. The trouble is no-one knows how to fettle them or play with the timing. Spitting is purely from having either too lean idle mixture, air leaks or too far advanced timing. End of. Poor bottom end is from having the progression jets too rich or lean. When I swapped to twin 40s from a twin choke downdraft it ADDED bucketloads of power down at the low end and really opened up the revs at the top. Most importantly they belong on my engine, scare children and sound the b*ll*cks
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Last Edit: Sept 2, 2006 12:52:01 GMT by Deleted
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Stu
Posted a lot
Posts: 2,913
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Sept 2, 2006 16:18:19 GMT
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Keep the audi standard or use k-jet if you know about it. I've had k-jet on a variety of Golf GTI's, including my current Mk2 with an Audi 6A 16v engine in it and I can't fault it. Very straightforward and when maintained great for hot/cold starts, low/high revs, hot/cold running the lot. On the other hand, I have twin Dellorto 40's on my Mk1 Golf and they sound excellent but there is no way I'd use them on a daily driven car, drinks like a fish especially as it's an auto, probably little if any performance gain over standard carb either. Seems to suit the 'retroness' of the car so they are staying but if I had to use it for work or anything then I'd be looking at sticking the standard carb or a single webber on there to improve economy and driveability.
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Last Edit: Sept 2, 2006 16:19:33 GMT by Stu
'89 BMW E30 325i Sport, '04 MINI Cooper S, '09 Volvo V70 D5
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tigran
Club Retro Rides Member
In rust we trust. Amen.
Posts: 6,444
Club RR Member Number: 142
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Sept 2, 2006 16:24:44 GMT
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Oi you frenchie sympathiser. Nuff of that. They are worth it for the sound alone and get muchos 'win super cool retro' points from me.
This is nothing to do with me finding a set from the same bloke I just bought my revo's from. Honest guv.
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Last Edit: Sept 2, 2006 16:26:42 GMT by tigran
1964 Rover P5 i6 1987 BMW 525e - The Rusty Streak 1992 Micra K10 2001 BMW E46 316i 2002 BMW E46 330Ci 2013 BMW F31 320d 2018 BMW G31 530d
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Sept 2, 2006 18:04:02 GMT
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the "hole in the bottom end thing can be overcome but as someone mentioned u set the carbs up for the rev range that they are used for on that perticular engine car race combo and live with the compromise on the rest.. I'm talking a few hp loss over injection or cv/ bike carbs. its mostly about the chokes being the correct size for the aplication rather than any other one thing.. i remember a a-series engine that had one 45mm webber on it and the webber was jetted the best it could be according to the dyno, but we changed the chokes and got the same peak power but much improved and a flatter torque curve throughout the rev range, he reported that even with no more power. the increased and more stable torque gave him 3 seconds a lap on a perticular grass oval he'd been competing on..... they are one of the most advanced carbs ever produced even now. but are put to shame by most bikes carb by comparison.. bearing in mind that most cars went to injection years ago and only recently bikes have taken injection up more redily.. just my experiences my vew in short...."great carbs very tunable BUT now expensive compared to bike carbs and much inferior! i think the weber bubble has burst!?" si ps. but they are a very sexy and retro carb!! nuf sed!
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Last Edit: Sept 2, 2006 18:05:35 GMT by B-8-D
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Sept 2, 2006 18:12:22 GMT
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I fitted a seconhand Dellorto 40 to the bugrat a few weeks ago, and though the top end was greatly improved, lower revs were full of flat spots and "burps!! " no matter how I adjusted it or set the timing. I bought a rebuild kit for it,stripped,cleaned it out, fitted the new bits this afternoon and set it up...WOW...what a transformation!! It's still not a carb that likes low revs, but it's so dramatically better than it was! Sounds fantastic too, the carb and loud exhaust hide the timing chain rattle very nicely!! ;D Just gotta be careful not to blow up the 170,000 mile Skoda engine though!!
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Sept 2, 2006 18:25:31 GMT
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my friend georges escort has 45s on a pinto (210bhp). it is very smooth at idle, this is because it has very little flywheel left. it revs cleanly from the point that you can pull away up to 7500 revs at least. he has had the opportunity to tune it on a rolling road for a day himself. however, you need 2000 revs to pull away because of the cam and the car has short gearing and weighs in at 800kg or less. I think the webers would suck if it was a full weight car without the hairy cam my old college lecturer used to say "weber is gods caburettor, su is his number 2". I prefer su's if you have the time for needle tweaking, at least on a daily engine. IIRC edelbrock used to do a holley 4bbl manifold for the pinto, esslinger do a 2 barrel manifold. I like holleys not like they're gonna fit an audi tho . k-jet is a nice straightforward system, at least it will drive nicely and return reasonable economy unlike webers that suck like a dutch hooker. my favourite k-jet quote ;D
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Sept 2, 2006 20:35:55 GMT
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webers are for all out, high tuned engines, thats what they work on. They aint suited to road cars or to being stuck on a stock as a rock engine just for the noise!
If you want it to sound cool you need bike carbs!
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tenman
Part of things
m00000000000
Posts: 899
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heh, I've had a ride in a 240Z that was running on not 2 but 3 Webbers... that did sound awesome... you could smell the petrol though when it was opened up... only got 2 little webber 38's in the sud and they sound nice..
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RWD Fanatic...
2003 BMW 320d Wagon (getting old and boring) 1996 Mini Kensington (SWMBO's)
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Sept 3, 2006 10:41:06 GMT
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If building a 4-pot engine for a lightweight(ish) Retromobile, if you don't want the added complexity of EFi, it makes perfect sense to me to call up Bogg Brothers, pay less than £300 and get a set of Bike carbs, a manifold and have them set up for your engine.
Look at the cost of twin Webers....
*n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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Sept 3, 2006 16:19:32 GMT
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Ah yes I forgot to point out I got mine about 8 years ago and they cost me £40 for the pair
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