Hi, As the topic says I'm building an 1800 KR with CBR900 carbs and I'm wondering about what size of jet's you are running on your setups ? I'm going to drill out 1.4mm at first try and then move up if that doesn't work. All help with jet sizes needed !
I believe most 2.0 16v engines run 1.8 jets, so I would agree starting with 1.4mm and move up if needed.
My jet sizes were 1.8 which were on a 2.0 abf using R1 carbs. Seemed ok but never properly tested. As above, better to start low and work your way up.
Yeah, think I'll start with 1.4 and test that out, what is the main problem with finding the right jet size? adjusting the idle ? the mixture on high revs ?
make sure you can check co level/mixture, a lean mixture can cause the usual pinking and potential engine damage etc
Totally forgot about how much it matters for the health of the engine to have the mixture not too lean and not too rich, wouldn't it be enough to have an lambda sensor near the outlet of the engine to see if I have the correct mixture ? This is my first engine build up but I have an bachelor degree in Mechanical Engineering so that I have a little clue on how to do all this
An exhaust co meter should be fine to get you initially up and running, then try and get your motor on a rolling road for a proper check.
http://www.efi-parts.co.uk/index.php?categoryID=87 Buy a ZT-3, only 160 and invaluble for road tuning, I've owned a Zt-2 for 10 years and it's been faultless. Tuned my 16v60 and my GTO-tt with it. Datalogging software is free too and comes with it. Best tool you can buy, I leave mine in full time just to keep and eye on things..
You cannot properly tune without a wideband you'll just be ****ing into the wind. just because it 'feels' ok doesnt mean your not running 12:1 cruise and getting mad bore wash lol
