Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

are there any hit and run tactics for orks.... or not

Generally not, because Orks kill things in CC, and by the time they're that close, there's really no running away.

Depending on Ork shooting is like depending on Americans to vote: here and there, it works, but overall, it's just not there.

I'm not even American and I appreciate the comparison. Good ol' compulsary voting here.
Back on topic though. If you really wanted to do a hit and run, though I don't quite understand why, you could try KoS.
Max out on 12 TL Rokkit buggies, 6 TL Big Shoot buggies, 10 Flash Gitz with 5 Big Shootas mounted in a BW with 3 TL Big Shootas and 5 Bolt on Big Shootas as well as a looted vehicle and some cheap HQ (maybe a Warboss with BS in BW) and you have yourself a lot of Dakka and a fair bit of mobility.

12 S8 Ap3 shots. 27 S5 Ap5 TL shots, 33 S5 Ap5 shots, plus a Pie plate should be able to do a fair bit of damage to a flank.

i made something up i gues... what about a wartrukk with 9 nobz+warboss all mega armour and 9 buggies around it... or some warbikes. go to the famous devastator hill kill the guyz in turn one(or 2 depends on the table) go on to the next squad and than lets bug a tank and for the 2 troop choses just 2* 10 grots and slaver
and hope the enemy didn't count on that much tanks for no KoS army