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BanditPervert

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Posts posted by BanditPervert

    First run and a few issues

    in Forced Induction

    Posted

    The choke doesn’t seem to affect the idle  at all, I have the mixture screws out at 2.

    Do you think the 102.5 oil feed restrictor is a bit big? I also have an -6 fittings on the drain side of the turbo so maybe that could do with being a little bigger 

    First run and a few issues

    in Forced Induction

    Posted

    (B12 blow through set up)

    Ran the bike up the road today and F*** me does she pull, revs went up smoothly and power feels brilliant. 

    It idles high at about 3-4k, tried adjusting the tick over screw but no difference so assuming its an air leak of some sort, it's also burning oil from the turbo outlet and dosent go away even running the oil pump for a few minutes. 

    Apart from that it just seemed to be stupidly hot!!!

    As always, any help is much appriciated. After that feeling from the first run i'm desperate to get it MOT'd and start abusing it. 

     

    Carb overflow

    in Forced Induction

    Posted

    I’m positive it’s connected correctly, i cut a single coil off the spring and got down to 2 so could snip a bit more off and get to 1. I guess every little helps but didn’t think it would be an issue at 2 

    Carb overflow

    in Forced Induction

    Posted

    23 hours ago, Gixer1460 said:

    Is the float ht. std or 'adjusted'? Obviously carbs are designed to seal only with gravity fuel pressure and any added pressure over that could be too much - i'd be tempted to back it off to 1psi or less? The boost added to the bowls and the FPR should keep it balanced.

    Where does the 1 to 2 psi come from originally, is there a sweet spot to aim for or just low enough for the float tabs to handle?

    Carb overflow

    in Forced Induction

    Posted

    Finally started the bike yesterday and ran lovely for around 30 seconds, sounded great raving up and down to 3/4 throttle. 
     

    Turned it off and fuel pissed out the turbo outlet, pulled carbs and cylinder 1 full of fuel and 2,3 and 4 were a little wet on the inlet rubbers. 
     

    when I started it, I let the oil pump run for 30 seconds, switched on fuel pump, just below 2psi from gauge, and then started the bike. I have the floats at 16mm, the vents pressurised from the pilot tube on the charge pipe, and the fpr fed from one of the carb tops.

    im guessing that the float on number 1 was not seating correctly but not sure why the others were wet.

    any advice would be greatly appreciated. 
     

    thanks 

    B12 off boost running problem

    in Forced Induction

    Posted

    On 5/2/2021 at 7:09 PM, colinworth79 said:

    Bov need to see vacuum to work so off carb tops .

    Fuel pressure reg either plenum or carb tops .

    Gauge depends on what you have if it has vac then  carb tops.

    I make a small manifold that links all 4 carb tops then took items off this to give a smoother reading.

    Ok thanks for the response.

     

    B12 off boost running problem

    in Forced Induction

    Posted

    So finally fixed my earlier f***up and have the engine and turbo back on the bike.

    have started plumbing up the fpr, pump and plenum but getting my wires crossed with the vacuum/ pressure references. 

    had a look at previous threads and seems some people are using carb tops to feed fpr, am I reading this right?

    I have BOV, gauge and float vents fed from plenum, in wastegate fed from compressor outlet housing and FPR from linked carb tops.

     

    B12 off boost running problem

    in Forced Induction

    Posted

    Quick update 

    the machine shop tested the valves for me and all were fine. Pulled the barrels to see if there was anything in there...

    I’ve obviously bent a ring on cyl 2 when installing them. Guess that explains the lower compression reading on that cylinder, so engine is coming out again as I find it a sod to get the barrels back on when in the bike. 
     

    Thanks for the help and I’ll be back when I’ve sorted this cluster***k

    04C16A97-0B59-4BA4-B621-E1216D59435C.jpeg

    • Like 1

    B12 off boost running problem

    in Forced Induction

    Posted

    1 hour ago, clivegto said:

    Get one of those tiny cameras down no 2 is what I would do for a look see it there are any marks on the piston from the valves or just wipe the head off. 

    I don’t have a tiny camera and this build has stretched the funds further Than I thought they would go!!

    I’ll get the head off tomorrow and see what damage has been done. 
     

    thanks 

    B12 off boost running problem

    in Forced Induction

    Posted

    Ok so pulled the valve cover off and timing has jumped a few teeth, manual adjuster wound it’s way back out, probably due to me not tightening the locking nut. 
     

    not sure if I’ve bent a valve or there has been any contact. Compression test on cold engine shows around 110 on cylinders 1,3 and 4. Cylinder 2 shows 102. 
     

    any ideas what it should be showing cold. And is 8psi indicating a bent valve?

    B12 off boost running problem

    in Forced Induction

    Posted

    Need help with getting it running, first start Monday and ran on 3 cylinders, carb 3 overflowing

    fitted new float valves and seats, set float heights to 15mm, mixture screws 1 3/4 turns out and stock jets.

    carbs back on and primed, no leaks. Turned over without plugs and all seems fine, choke on and I get the stumble and popping. Choke off and nothing.

    the turbo is only plumbed on the exhaust side.

    any suggestions would be greatly appreciated.

    thanks 

     

    I do have a video but not sure if I can upload on here.

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