VW 1776 tp trike weber 32/36 dfev stumbling badly

[Lev levvin]

Author Message
Lev levvin
Samba Member


Joined: Yesterday
Posts: 1
Location: Cornwall UK
Lev levvin is online now
PostPosted: Yesterday 11:24 pm Post subject: VW 1776 trike weber dfev stumbling badly Reply with quote Edit/Delete this post Delete this post
Hi
First post on here but have read info for past few years
I live in Cornwall Uk and have built a vw 1776 twinport engined trike over past 2 years

I've used 90% brand new parts in engine
It's running new barrels and Pistons, huco 2.5psi electric pump, accuspark vacuum dizzy, Bosch lifetime leads and plugs, 75a alternator, filter King regulator filter and skat external spin on oil filter/pump.

I also have a brand spanking new weber 23/36 dfev single carb and fully heated manifold fitted
This is where I'm hitting problems

The engine runs smooth as silk on tickover, 950 rpm and runs like a modern car engine, no surging or vibrating at all

I've checked the combustion with a gunsons colourtune, perfect blue flame.

I'm running a 45 idle jet and mixture screw out 1 3/4 turns at best lean idle

But... As soon as the throttle is opened the engine gasps and stalls 😞
If you blip the throttle then open it normally it'll pull through and drive ok
But every gear change and pulling away from stop and it'll hesitate and stumble

The choke is fully off

This is at 950rpm onto butterfly valve starting to open

Please can someone advise on how to fix this?
I've tried weber uk but they were no real help other than sending out two different idle jets to try

the carb was supplied as a kit for vw 1600-1800 with a 60 idle jet
It won't run ok with this jet, chugging black smoke and stinking over rich
The 50 is almost there but 45 is definitely best for tickover and driving

The hesitation doesn't change on any size jets

I've built this trike so I can give my wife with MS a good summer as it's unlikely she'll be able to ride pillion next year 😞

With this problem the trike is very dangerous as it stalls pulling out of junctions

Help very much appreciated thank you
Back to top

[FeelthySanchez]

Have you verified adequate accelerator pump shot from the discharge tubes?
_________________

[Lev levvin]

Awesome!!!
I looked at the accelerator pump
Yes it's working but not passing enough fuel

I used a screwdriver to drop the pump arm further than normal in sync with opening throttle and it revs up perfectly

I'll order a bigger accelerator pump jet Monday

Many thanks for putting me in right direction

[FeelthySanchez]

Well that certainly didn't take very long ........
_________________