3 Carbs installation
- Thread starter tturbo
- Start date
blumax
(deceased)
Three carbs--my .02 cents
A few owners have had the triple side draft set-up--and many have complained--also--I too had gathered the parts many years ago and my German MM suggested that for street use I wouldn't be happy with the setup--good for race--needs rich stup so gets VERY thirsty and following traffic at a signal in your area would be unhappy with your exhaust emissions--keeping three Weber side drafts in syn can also be a PITA--so if you are going to track the car a lot and have very limited street use in the Los Angeles traffic go for it--but if you will be driving regularly in the type of trafic around LA I would'nt do it today--either.
JMT others may see it diffrently
A few owners have had the triple side draft set-up--and many have complained--also--I too had gathered the parts many years ago and my German MM suggested that for street use I wouldn't be happy with the setup--good for race--needs rich stup so gets VERY thirsty and following traffic at a signal in your area would be unhappy with your exhaust emissions--keeping three Weber side drafts in syn can also be a PITA--so if you are going to track the car a lot and have very limited street use in the Los Angeles traffic go for it--but if you will be driving regularly in the type of trafic around LA I would'nt do it today--either.
JMT others may see it diffrently
x_atlas0
Well-Known Member
That's pretty much what I found, as well. If you want a bit better breathing, without killing the mileage and (relatively) easy synching, try the dual Weber 38 setup. The stock Zeniths are pretty darn good, though.
Bill Riblett
(deceased)
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Contrary response
I have triple Weber sidedrafts and find them very liveable. My engine was built by Korman in 1980 to his stage 2 level, which includes lots of modifications. I believe you will not see the real benefits of the sidedrafts without at least a "hotter" camshaft. Personally, on an engine that was internally stock, I would go with the Weber 38 downdrafts.
My engine has somewhere around 100,000 miles on it and has seen autocross and driver school activity. I bought it used 19 years ago, so actual miles on it is unknown.
Drawbacks: runs rough and backfires occasionally at start-up. THis could probably be improved if I hooked up the choke linkage, but that is a little tricky. Once warm, it idles at 1100 rpm.
I have three sets of main jets and with the leanest installed, get 15-22 mpg with overdrive 5 speed. The carbs stay synchronized for years. Once set up properly, I contend that these carbs are very reliable, at least as much so as the factory Zeniths.
In exhaust emissions testing, I could meet CO standards, but the camshaft overlap kept me above HC levels.
I have triple Weber sidedrafts and find them very liveable. My engine was built by Korman in 1980 to his stage 2 level, which includes lots of modifications. I believe you will not see the real benefits of the sidedrafts without at least a "hotter" camshaft. Personally, on an engine that was internally stock, I would go with the Weber 38 downdrafts.
My engine has somewhere around 100,000 miles on it and has seen autocross and driver school activity. I bought it used 19 years ago, so actual miles on it is unknown.
Drawbacks: runs rough and backfires occasionally at start-up. THis could probably be improved if I hooked up the choke linkage, but that is a little tricky. Once warm, it idles at 1100 rpm.
I have three sets of main jets and with the leanest installed, get 15-22 mpg with overdrive 5 speed. The carbs stay synchronized for years. Once set up properly, I contend that these carbs are very reliable, at least as much so as the factory Zeniths.
In exhaust emissions testing, I could meet CO standards, but the camshaft overlap kept me above HC levels.
bengal taiga
Well-Known Member
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How about 2 Three barrel webers?
With apologies to the original poster, I know this is off-the-wall and does not address the original post.
An acquaintance who used to own a 2800CS told me that he once saw someone who had adapted the three barrel carburetors used by lancia and porsche - to an e9. I never saw them, and I don't know if the acquaintance saw them installed and running or viewed them after a long long weekend of celebrating. :roll:
I visualize the carbs sitting low to the side of the head with manifolds that resemble the traps typically found under the kitchen sink.
The carbs depicted on the following sites sure look interesting, but hardly practical!:wink:
http://craigtcg.com/features.htm
http://www.racetep.com/pmocarb.html
With apologies to the original poster, I know this is off-the-wall and does not address the original post.
An acquaintance who used to own a 2800CS told me that he once saw someone who had adapted the three barrel carburetors used by lancia and porsche - to an e9. I never saw them, and I don't know if the acquaintance saw them installed and running or viewed them after a long long weekend of celebrating. :roll:
I visualize the carbs sitting low to the side of the head with manifolds that resemble the traps typically found under the kitchen sink.
The carbs depicted on the following sites sure look interesting, but hardly practical!:wink:
http://craigtcg.com/features.htm
http://www.racetep.com/pmocarb.html
Malc
Well-Known Member
Could be that the carbs your friend saw were adapted from Lancia/Fiat These would of been Delorotos. Basicaly Italian Weber style carbs.
Agree with previous posts, once setup they will be fine for years, it's the setting up that's a pain! You may have to play with Jet and oriffice sizes for ages before hitting the correct setup.
Throttle linkage has to be spot on and may have to be bespoke.
You also need to think about the mounting, inlet manifolds, vacuum supply for servo and distributor. Air filters and cool air intake like the B2 Alpina setup that was posted recently and finally.....
Setup should be done on a rolling road/Dyno
Malc
Agree with previous posts, once setup they will be fine for years, it's the setting up that's a pain! You may have to play with Jet and oriffice sizes for ages before hitting the correct setup.
Throttle linkage has to be spot on and may have to be bespoke.
You also need to think about the mounting, inlet manifolds, vacuum supply for servo and distributor. Air filters and cool air intake like the B2 Alpina setup that was posted recently and finally.....
Setup should be done on a rolling road/Dyno
Malc
Ephriam K. Williams
Active Member
Triple Webers Are No Problem At All...
Triple Webers are no problem at all. I learned all of the particulars myself and don't have any problems what so ever. I use them daily as well. Don't believe the hype. I encountered no help from anyone once I told them that I wanted the three deuces... My Father, Korman, My mechanic, and my BMW bretheren. Go with injection...go with injection... I don't know... But with very little research and reading... "YOU" can get your deuces running just fine - EVEN FOR DAILY DRIVING. They are not hard or a PITA as some might make out. LOL and respectfully. The only way to find out is to try it and see. I was going to go with injection UNTIL I put the deuces on and realized that I liked them (Initially running very badly). I tried the webers initially because I had everything needed to install them... so I did... and I hav'nt looked back since. They offer more power and better throttle response in my opinion that injection. And when you hit the gas... OMG ( You really have to be there and hear it for yourself). BUT I will say this... Gas goes rather quickly when you have a heavy right foot. They only way to tell is to try them for yourself. Look in the classifieds and I have a set of matched dcoe that are period correct for a 3.0. All they need is a few pieces that can be easily bought from weber. Alot of the help that I recieved was from this forum. Thank You! Just search the archives. Also on first fives.org. Can I say that here. LOL. Anyway... Respect, LOL and HTH. Sorry so long.
Regards,
Triple Webers are no problem at all. I learned all of the particulars myself and don't have any problems what so ever. I use them daily as well. Don't believe the hype. I encountered no help from anyone once I told them that I wanted the three deuces... My Father, Korman, My mechanic, and my BMW bretheren. Go with injection...go with injection... I don't know... But with very little research and reading... "YOU" can get your deuces running just fine - EVEN FOR DAILY DRIVING. They are not hard or a PITA as some might make out. LOL and respectfully. The only way to find out is to try it and see. I was going to go with injection UNTIL I put the deuces on and realized that I liked them (Initially running very badly). I tried the webers initially because I had everything needed to install them... so I did... and I hav'nt looked back since. They offer more power and better throttle response in my opinion that injection. And when you hit the gas... OMG
( You really have to be there and hear it for yourself). BUT I will say this... Gas goes rather quickly when you have a heavy right foot. They only way to tell is to try them for yourself. Look in the classifieds and I have a set of matched dcoe that are period correct for a 3.0. All they need is a few pieces that can be easily bought from weber. Alot of the help that I recieved was from this forum. Thank You! Just search the archives. Also on first fives.org. Can I say that here. LOL. Anyway... Respect, LOL and HTH. Sorry so long.Regards,