Hello, Looking for help please, I have a mk2 rocco ( originally 1.8 8v ), now 2.0 3a bottom end with lightweight flywheel and big valve tsr head and 203 cam. I have put a single 45 carb and mani on. I have exhaust all wrapped and heatshield,d up for carb. The carb was running on a modified 1.9 8v engine of similar spec so figured jetting should be close. I have got it started and idling nice n smooth. But when i drive it i can only give it light throttle, basically just staying on the idle circuit. Engine just bogs down or pops n spits if i try and give it more. Fuel pressure is set at 3 psi I got some of the jet sizes for your opinions, Chokes 34 Aux vent 3.5 Air corrector jets 180 Main jets 165 Emulsion tubes f16 Idle jets 55 f8 Pump jets 55 Hopefully someone can shed some light on my problem The carbs were all stripped n cleaned prior to fitting. Thanks in advance guys...
Popping spitting is usually weak idle setting, Not having any real experience of single carb setups cant help further. Dash mounted AFR gauge essential though.. Jon
Hi Jon, I have been to doing some reading on weber carbs so also figured i must be running lean. I have an assortment of weber parts so i put in some 60 f9 idle jets which made it only slightly better. Can you reccomend any afr gauge setups? I'm coming from bike carbs which were very simple to setup just a pita to adjust with the bowls underneath. Thanks Pete
What I use (and love) is probably the cheapest non Chinese one on the market. AFR4 or AFR3 (Lumenition) Work fine Have one on each of my race / rally cars. Narrowband, but seems to work fine The Weber tuning book (from Weber themselves) is ACE Jon One of my racers (twin 45's) runs 55F9 idles but they are on full race cams, so inefficient at idle
Hmm this has got me thinking. I like the idea of afr gauge, so know im not getti g close to melting pistons haha. Suppose i would need to weld a boss on my downpipe somewhere... I was kind of hoping that the single weber would run ok on what jetting it had, but as its not i went and dug out my twin 40 webers out. They were going on my mk1 golf but screw it... Surely i will get better gains with the twin 40s? And if I'm going to have to adjust the jetting i may as well do these and ppl have more experience with twins over the single i suppose. Here is the jetting they have. 50 f9 idles 140 mains F16 emulsions 185 air corrector jets 45 pumps 4.5 aux 34mm chokes Hopefully get them on by the end of week and see how they go and report back.
Just a quick update, Fitted the twin 40s. Gave them a good going over and adjusted float levels. I had a problem initially where the fuel was pissing out of the overflow/ hole above trumpets... this was due to me accidentally bending the float and making it squint in the chamber so it got stuck. Sorted it now and its running very good and smooth transition from idle through to mains at WOT. Very pleaed at this stage. Had a quick look at the plugs and they are a nice colour so now off on the dyno next month hopefully. Cheers.
Hello, Afraid I'm not selling. The lynx mani is a bit of a rare thing these days and its a bit different so its just staying on my rocco as its only the summer toy kinda thing... they do pop up on the bay now n again. Pete
Ok m8 dont blame you for keeping it been looking for one for a while as I thought it would be an easy upgrade but you cant find them anyway