Anyone using the cheapo chinese weber IDF's? Any good? Cheers simon Sent from my H8166 using Tapatalk
I don't know what your after but I have a genuine set of ICTs for a 2ltr for sale. https://thelatebay.com/index.php?threads/weber-ict-34-complete-set-up.92399/
I’ve not tried them but I have read plenty of reports, unfortunately the quality appears to be erratic with no way of knowing whether they’re good or bad before you try them – but they are very cheap. 34 ICTs are a too small for your 2056cc engine and you might be better off with these if they’re still for sale https://thelatebay.com/index.php?threads/pair-weber-idf-40s.92450/ although they’d need type 4 manifolds, throttle linkage and new chokes and jets.
Really? I can't agree, I've driven 2.0l with them that went like a rocket despite it's massive devon pop-top. They have slightly bigger venturi than stock, I think the carb is the same size?
Look at the spec of his engine. You’ll have to search for it, he’s a bit economical with information.
The questions are.... Are the copy weber carbs any good...? Anyone using them? Cheers simon Sent from my H8166 using Tapatalk
It may take a while for someone who has them, to reply. I'd listen to what @77 Westy has read and said about them though. Someone who owns a set may tell you theirs are fine, then you buy a set and yours turn out rubbish. Inconsistent with no way of knowing if yours will be ok is a very worthwhile post.
I have a set of weber IDF's and just had a look at the cost of new genuine and noticed the copies at a fraction of the cost of genuine...as a contrast i have a dellorto flatslide carb on one of my scooters, cost £200 ish new i need to re jet change the slide and atomisers to use on another motor... Cost of genuine parts to do this is another £100 or so... A chinese copy is £20 and a set of jets ect say £15...i have bought the chinese copy and will try it out today...my selection of the chinese copy was based on the most rediculess name i could find and there are lots to choose from lol Sent from my H8166 using Tapatalk
For £20 its got to be worth a go. Just make sure nothing can break off and fall through the carbs into the engine
People have a fixation with fitting carburettors that have too large a venturi on a bus engine, where it is not doing 6k to 9k RPM as it would in a racing Beetle. They fit the big carbs, and lose the vacuum signal, which is actually a sign that the carburettors are running with too-slow airflow, like with a progressive when you floor it and it falls on its face because you just suddenly more than doubled the venturi area. You really want to fit the smallest venturis that let the engine make the designed RPM for a bus. And they will be smaller than for a drag racing Beetle. A pair of 34 mm single barrel carburettors is about right. For a pair of duals, even smaller should work best. Bigger may be harder to tune because you are meant to have vacuum to suck the fuel through the main jets. If the vaccum is tiny, they become more and more sensitive to fuel level and more of a pain.
AFAIK nobody on TLB is using copy IDF’s but even if you find someone and they report that they are good (or bad) it doesn’t mean that the ones you buy will be the same. As I said, the quality is erratic, rather like AA pistons and cylinders, often good but occasionally poor.
34 carbs work well on a standard 2.0l but Simon is building a 2056cc engine with big valves and a very big cam and 34 carbs are too small. He’s also used dished pistons and consequently the dynamic CR will be lower than ideal for the cam to work well, it will need to rev and low-down torque will be poor but it should make good BHP. It’s an odd spec for a bus engine and it will be interesting to know how it drives.
40 idf rebuild I have 28mm venturies, 35 auxillery venturies and 33 pump jets. Idle, main and emulsifier tubes are in the right ball park i think Whats your thoughts for my motor? Cheers simon Sent from my H8166 using Tapatalk
What idle, main and emulsion tubes are you using and what is the engine spec? For my 2.0l with 41 x 34 valves, Scat C25 cam and 8.2:1 CR I used: 30 vents 180 Air Correction F11 Emulsion 125 Mains 55 Idles And I use the same jets with 32 vents in my 2316cc (same cam and heads as the 2.0l but 9.0:1 CR)
I have 125 mains 180 airs 50 Idles F11 emulsions 28mm venturies 35 auxillery venturies And 33 pump jets Engine is 2050 cc Big valve heads slightly ported G grind cam Sent from my H8166 using Tapatalk
Any knowledge on venturies and pump jets... And what about velocity stacks? Cheers simon Sent from my H8166 using Tapatalk
yes to velocity stacks, as they could stop broken air filter studs falling into the carbs! The link will tell you more about selecting the best length for your air flow needs etc https://shoptalkforums.com/viewtopic.php?t=122047
