11 replies to this topic

[samt88]

I'm looking at a set of twin carbs on eBay for a 90s rebuild cooper. How much should I pay and Is it worth it? What advantage am I likely to see? It's a 1 1/4 inch twin carb.

[Captain Mainwaring]

Bit more low down puff compared to a sing HIF, but that's it.

 

I don't know, maybe £120-150 depending on many things

[Tamworthbay]

Price range is very wide. A pair needing a rebuild can be had for £40ish, up to £80-£100 for a set that have been tarted up. A properly rebuilt pair that are ready to fit could easily be £200 if not a bit more on a good day. They key is to ensure they are decent. Any wear (particularly in the spindles) and they will never stay balanced.

[samt88]

Ok cheers :) is a rebuild something I could do myself?

[samt88]

I've taken a carb apart before but what does refreshing it involve?

[KernowCooper]

Complete strip, new spindle and bushings in the carb body, new jet assembly and needle and a new needle valve and reassembly getting the float lever set. Your biggest problem is reaming the new bushes to size when fitted, if you dont have a reamer, Don't be tembted to file them its not accurate enough. Give Burlean a ring 01722 412500

[HarrysMini]

I think it is worth getting them if you can get them for a decent price, I certainly wouldn't pay the £150-200 that they go for on eBay. I recently bought a pair of HS2s with manifold etc. for £50 delivered. I'm currently rebuilding them and they did need it as the spindles had a heck of a lot of play. 

 

Give Covert on here a PM to ultrasonically clean them, that way you can be sure that the dirt isn't going to cause issues, he did mine for a really good price and they look so much better. 

 

A comprehensive rebuild kit is around £70 and that includes pretty much everything you need. 

 

Twins are definitely worth it though, it really depends on the rest of the engine setup, but I usually find improved throttle response and more low down torque, perhaps with the reduction of a bhp or two at the very top end. That might be a problem if you like talking horsepower at the pub, but in reality the aforementioned improvements are definitely more noticeable and useful. I won't bore you with the reasoning behind these improvements, but basically more air/fuel can get through two partially opened smaller throttles than one larger opened to the same amount. 

 

You can improve them further by doing 'Vizard Mods' on them, which involves making them flow better. 

[AFMike85]

There's a 90's Cooper airbox with elbows on ebay right now for £60, but all my research says it's better to get the original cooper box

[mk1leg]

get yourself a new set....by the time you have got a set off fleece bay and then overhauled them with all new parts new ones are cheaper.......

 

http://www.minispare...win.aspx?130204

[HarrysMini]

get yourself a new set....by the time you have got a set off fleece bay and then overhauled them with all new parts new ones are cheaper.......

 

http://www.minispare...retors/Twin.aspx?130204

You can buy and refurbish a set of HS2s for well under £600! 

 

Pair of carbs with manifold, heat shield and linkage - £50 

Full rebuild kit - £70 

Ultrasonic Cleaning - £20

 

= £140!

[timmy850]

There's a 90's Cooper airbox with elbows on ebay right now for £60, but all my research says it's better to get the original cooper box

Yep, they fit the big oval filter and they aren't as efficient as the twin ones on the original Coopers

 

http://www.rsp-coope.../The_S_Pack.htm

[Captain Mainwaring]

I think it is worth getting them if you can get them for a decent price, I certainly wouldn't pay the £150-200 that they go for on eBay. I recently bought a pair of HS2s with manifold etc. for £50 delivered. I'm currently rebuilding them and they did need it as the spindles had a heck of a lot of play. 

 

Give Covert on here a PM to ultrasonically clean them, that way you can be sure that the dirt isn't going to cause issues, he did mine for a really good price and they look so much better. 

 

A comprehensive rebuild kit is around £70 and that includes pretty much everything you need. 

 

Twins are definitely worth it though, it really depends on the rest of the engine setup, but I usually find improved throttle response and more low down torque, perhaps with the reduction of a bhp or two at the very top end. That might be a problem if you like talking horsepower at the pub, but in reality the aforementioned improvements are definitely more noticeable and useful. I won't bore you with the reasoning behind these improvements, but basically more air/fuel can get through two partially opened smaller throttles than one larger opened to the same amount. 

 

You can improve them further by doing 'Vizard Mods' on them, which involves making them flow better. 

 

 

Not for the same CSA they can't. Simple area VS circumference calculations.   You've got that completely around the wrong way.