Page 2 of 3
Re: Flat spot at 2500rpm
Posted: 03 Jul 2019, 17:22
by diabolov
HA AH You should make that into a wiki.....er hold on!
I would of thought that a WWW search would of brought up a bit more then it did on the jet, but then I am on the works computer
so who knows what is being filtered...
Well done for keeping tabs tho Mr Feet
. That's my evenings entertainment sorted..
M
Re: Flat spot at 2500rpm
Posted: 03 Jul 2019, 20:10
by 937carrera
Too much fuel injection experience for me with these venturi thingys........ I have only had a carb fuelled daily driver for 4 weeks, before going back to FI again. Picking it up a bit of experience on these T25's though
Mind you as a mk2 1600 Scirocco I believe that had a Pierburg too
Re: Flat spot at 2500rpm
Posted: 03 Jul 2019, 21:37
by kevtherev
itchyfeet wrote:937carrera wrote: just trying to figure out why VW went for that setup rather than the simpler mechanical linkage / cam type approach
They didn't becuse VW never made carbs Pierburg did
Carbs like any technology just got more and more complicated probably for minor performance, economy, reliability and emissions reasons that are long forgotten.
Yes the pierburg was at the zenith of carburettor technology in the 80's for low emissions.
If emissions were not the issue VW would have fitted twin Delorto DRLA imo. (and unleashed the horses)
*Shakes fist at the EU
Re: Flat spot at 2500rpm
Posted: 03 Jul 2019, 21:54
by 937carrera
Are you sure Zenith weren't the zenith of carburettors
http://zenithcarb.co.uk/
VW were mad on Solex's until the early '80's, including the CU engined T25's
Re: Flat spot at 2500rpm
Posted: 03 Jul 2019, 22:03
by 937carrera
James has some excellent new downloads here.......... the self study programme includes lots of useful 2e3 carb diagrams
https://vwt25.blog/files/
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 06:27
by itchyfeet
I remember James making those videos long after many of us were tinkering with 2e3s, I'm not taking away from them because they are good but have not come from many years of experience!
This is useful,
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 06:32
by itchyfeet
Just a though Kev, are you on LPG?
When I had a flat spot it wasn't really there with LPG more with petrol but I have a closed lop which gives it plenty of LPG
LPG setup could cause this as it goes lean.
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 07:07
by 937carrera
itchyfeet wrote:I remember James making those videos long after many of us were tinkering with 2e3s, I'm not taking away from them because they are good but have not come from many years of experience!
This is useful,
Your image isn't showing...... and did you follow the link to get those manuals (not videos)
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 07:19
by diabolov
I can see the image here!
I think James has had those carb links up a while as I have them saved on my comp.. but good to have a link
for those that need them.
M
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 09:32
by itchyfeet
937carrera wrote:
, so next port of call would be James Akers Sir Adventure website and videos
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 12:35
by 937carrera
Keep up at the back please
937carrera wrote:James has some excellent new downloads here.......... the self study programme includes lots of useful 2e3 carb diagrams
https://vwt25.blog/files/
I hadn't seen quite a few of those before anyway..... gearbox manuals......
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 13:25
by kevtherev
itchyfeet wrote:Just a though Kev, are you on LPG?
When I had a flat spot it wasn't really there with LPG more with petrol but I have a closed lop which gives it plenty of LPG
LPG setup could cause this as it goes lean.
Yes on LPG and it isn't there when on that.
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 16:28
by itchyfeet
kevtherev wrote:itchyfeet wrote:Just a though Kev, are you on LPG?
When I had a flat spot it wasn't really there with LPG more with petrol but I have a closed lop which gives it plenty of LPG
LPG setup could cause this as it goes lean.
Yes on LPG and it isn't there when on that.
So this is a flat spot on petrol only?
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 16:30
by itchyfeet
937carrera wrote:Keep up at the back please
I thought you were at the back having just learned the basics of 2e3
Re: Flat spot at 2500rpm
Posted: 04 Jul 2019, 17:39
by kevtherev
itchyfeet wrote:kevtherev wrote:itchyfeet wrote:Just a though Kev, are you on LPG?
When I had a flat spot it wasn't really there with LPG more with petrol but I have a closed lop which gives it plenty of LPG
LPG setup could cause this as it goes lean.
Yes on LPG and it isn't there when on that.
So this is a flat spot on petrol only?
I'm going to take it out for a drive tomorrow.
I've fitted a better vacuum unit that operates like your video.
Ive also fitted a refurb kit and gave it a deep clean.
I'll have a definitive answer later.