Changing from a Rochester B to a Weber 34 ICH

[64Blue]

My Rochester is running poorly and I think the upper and lower shells are warped. I have another Rochester, Solex and a Weber. But all need to be rebuilt and I have a kit for the Weber.

But out my question is, what do I need to do to the linkage to change from the Rochester to the weber? I have the adapter that rotates it 90 degrees, but the throttles work in opposite directions! I.e. The arm on the linkage pushes up on the Rochester to accelerate whereas the weber gets pulled down. Is it just a matter of flipping the fulcrum so around? I was hoping to find a thread on this but haven't yet..... Thanks!

Frankly, just curious what happens if I throw the weber on vs the current Rochester, and I might throw the Solex on too.....

All help very appreciated!

'64 2A with 2.25


J

[Les Parker]

http://www.roversnorth.com/Land-Rover-Parts/34

You'll need #'s 16 and 25.
Plus necessary gaskets.

ATB

[64Blue]

Interesting. Thanks! So looks like someone already changed 16 upside down already and just needs to be changed back.... Thanks

[bugeye88]

64 Blue,
The parts Les talks about will facilitate the change. I have run Rochesters and Weber 34's and I prefer the Weber. The one thing to remember with the Weber 34 is that there is a main jet at the bottom of the float bowel that is prone to clog if you aren't filtering the fuel well. Make sure you are running a clean filter in you fuel pump and probably an inline filter after that as well.

Cheers,

Rob
Bugeye88

[offshoretitan]

I purchased a 1965 Series IIa 88" in Batavia, IL in January. It had been fully and authentically restored in ~2000 and then driven very little. When the seller went to get it 'ready for sale' the Solex needed a rebuild. He chose to quickly purchase a Weber from RN and install it to help get the vehicle running. I had the truck shipped to a highly regarded vintage, English vehicle specialist shop in Tennessee in late Jan. They went through the entire vehicle to return it to reliable running condition (new fuel tank, swivel balls, various seals, all fluids replaced, etc., etc. (I didn't receive the vehicle until mid-March, so it was very thorough...) Their only complaint was the Weber. The 2.25 petrol doesn't want to accelerate well, doesn't want to start easily when warm, and the vehicle wants to diesel went shutting down. As I recall from our discussion, the mechanic who has worked on the vehicle thinks part of the issue is a vacuum differential between this and the Solex in operation with the distributor. He is anxious to return the Solex to operation. (This is a shop that works on nothing but antique and unique vehicles and I think this mechanic's experience is worthy of consideration.) I've sent the Solex to Charles Kellog at Dare Brittania for him to do a detailed rebuild and will have it installed later this spring/summer. I'll report back with the differences, if any, between it and the Weber.

[bugeye88]

Sounds like the Weber 34 isn't jetted or tuned correctly. Also the vacumm line has to be set up and functioning for any carb/dizzy set up. Timing and valve adjustment etc is also a possible problem. I can tell you that a properly set up Weber 34 ICH is great carb. Good idle, linear acceleration with no lag. I would suggest searching this site for threads regarding the set up and tuning of the Weber 34 ICH. Good luck on the tuning and set up of your Landy. This and other sites can be of great use in this and other issues related to the specific needs of vintage Land Rovers.
Cheers,
Rob
BugEye88

[offshoretitan]

Thanks, Rob. The timing and valve clearances have been newly set, with the timing checked several times. It could be jetting. I'm interested in the other threads on jetting and tuning. That's a great suggestion. Thanks, Scott

Rob, I should have also mentioned that as I recall the discussion with the mechanic the vacuum-related dissatisfaction was that the Weber was pulling a greater vacuum than the Solex and advancing the timing too much at certain acceleration amounts.

[bugeye88]

"Rob, I should have also mentioned that as I recall the discussion with the mechanic the vacuum-related dissatisfaction was that the Weber was pulling a greater vacuum than the Solex and advancing the timing too much at certain acceleration amounts."[/QUOTE]

Vacuum should not cause the dizzy to advance too far if the cab jetting/mixture and timing are set correctly.The thing I like about this carb is that when properly set it provides steady and linear accretion without flat spots experienced with some carb set ups. As of jetting, check with this and other sites for jetting the is correct for your altitude. Weber specific sites such as Redline and others may help and I have found them very good in providing set up and tuning information.

[griswald]

You should not send anything to Charles Kellogg. Sorry, it is a known fact that he is crooked and will over charge you. I have owned Series Land Rovers for over 20 years, please do not take this post personally.

Google Charles Kellogg, British Northwest Land Rover Company.

I live near Seattle and have seen the issues first hand.

Griswald
1965 IIa 88
1966 IIa 88
1971 IIa 8

[offshoretitan]

Thanks for the heads up! It's too late in this case as my carburetor is already out there. Good news is - it's just a carburetor. I'm interested in trying the Solex; I'll still have the Weber also in case it's still the best option. I'll post an update when the Solex has been tested (which will probably be later this summer).

[offshoretitan]

A couple of posts over on Landrovernet.com have me thinking the Weber is likely the root of my dissatisfaction. This one from Adama on 1-23-16:
"I have fuel pressure issues with my webber too, i still have a manual pump, but it over pressures and fills the webber. The old manual pumps make most pressure at low engine speed counter intuitive i know, but its the rule for all diaphragm pumps. Have messed with it a few times, but shes inclined to flood on start up. Not so bad in the cold when you need some choke effect, but can be a pig in the summer with a warm engine." http://forum.landrovernet.com/showthread.php/287702-finally-fitted-leccy-pump-on-my-series

And this from the same poster on that topic 2-8-16 after he installed an electric fuel pump and pressure regulator (which I don't want to do):
"Yes I have to second the starting improvement too, starting her today after she sat for a few days was damn near instant, had a 2 hour job at a customers, coming out she started right up again. Have never had her start so well since i had a good zenith carb, the webber had always been some what of a let down, both economy and performance wise. Starting use to be a big smelly fuel rich cloud, that's totally gone!"

In fairness to the Weber, there's lots of information on various forums about how great the change from a stock carb to the Weber has been too... so who knows. Just something I'm interested in trying.

[bugeye88]

off shore,

Last post on this for me. Just saying, A Weber 34 is the best running carb I have ever used on a 2.5 petrol Landy. ,INCLUDING SOLEX, Rochester, Zenith and others. Fuel pressure to these is no different than any of the others, proper jetting and adjustment is the issue and will occur with all carbs. I run a standard fuel pump with an in line low pressure pump that can be turned on and off from the dash and it works great in all conditions. Don't blame the Carb for improper set up. Many of the symptoms mentioned in this thread can be traced to issues other than the carb, but can also be related to improper jetting, clogged jets, bad timing, valve adjustments on and and on, but it is certainly not due to e Weber 34.

Rob
bugeye88

[offshoretitan]

Thanks, Rob. I'm a long-term 2 stroke dirt bike rider and completely understand the impact and potential of proper jetting. I may very well return to the Weber and go through a proper jetting process to get it to perform better. The valve adjustment and timing on my Land Rover can't really be improved upon much at this point so jetting or possibly the distributor itself are more likely opportunities for improvement. My bias is simply toward originality and so I'm going to try the rebuilt Solex to see if it improves the situation. If not, I'll keep experimenting. This is a lot of the fun of this hobby for me. I appreciate your well-reasoned support of the more modern Weber.

[bugeye88]

Offshore
The Webber is really not very "modern" rather it offers good intake velocity for torque and good fuel supply for some top end. Something the Solex lacked. The Rochester provides goo top end but sacrifices low end torque. The Solex lacks at each, in my opinion.

Rob
Bugeye88