El Gringo
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Posts posted by El Gringo
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Quick update, should have the bodywork back this weekend, so in the meantime i figured a proper exhaust might help with the possibility of getting it MOT'd
Also been through the carbs again and given them a good clean - looking much tidier now
One thing that i did notice that might have quite a large effect on the transition - where the tees feed the float bowl vents from the pitot tube, the rubber is very soft and doesn't seal very well over the stubs. I've now lockwired these to try and seal them a bit better but it's not ideal.
I did have a read back through the spondon bandit thread and found the mod using the outer feed points but i don't think there's enough sticking out to get a good fit on the 400 carbs (plus i can't get the bank of carbs apart to fit the cross pieces between the stubs) - might be something to look at in the future
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26 minutes ago, Blubber said:
Nice
- can post a picture of the choke bar plate?
And...curious if you can still use the choke (or use the software for cold start enrichment )
I'll take you a pic later @Blubber- It's nothing fancy, a bent bit of 10mm wide steel flat stock, there was a "spare" casting on the end of the carbs so i tapped it to M6 for a bolt.
Choke works the same but you have to manually put the plate over the end of the choke rod and do the bolt up - just need to remember to take a 5mm allen key everywhere with me
It's only a temporary measure to see if that's part of the problem, if it helps i'll make something more permanent
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All going according to plan so far
Engine is back in, body work should be back at the weekend.
Carbs need another clean and i think i'm going to go back to the 100 main jets - then it's a case of connecting everything back up
I'm still a tad concerned about it not transitioning on to boost properly but i think it's just going to need a bit more testing - there are only a finite number of things it can be now
I've added a take off to the plenum to feed the fuel pressure regulator, and i'm looking at making s series of restrictors for the pitot tube so we can try smaller bores to see if that helps
I've also made a little plate to hold the choke bar closed to rule that out
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9 hours ago, no class said:
…..that would require a visit …..no conversation followed by a punch in the face
indeed, I agree wholeheartedly!
Unfortunately i've no idea which of the 16 previous owners it was. I think it's had a troubled/hard existence
Still, onwards and upwards, i've got a spare motor now which is always a bonus and i've been doing some reading up on using FZR600 pistons which will give it a bit of a capacity bump so at some point it'll probably be getting a mk2 engine
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11 minutes ago, Gixer1460 said:
Wonder if the 'engineer' doing the drilling said ' oh bollocks' when the drill chuck hit the exhaust port.............and did he fetch out all the drill shavings - Hmmm what do you think!
It does explain where all the bits of swarf that were in the sump the first time i took it off came from!
Fortunately, this second time round it's nice and swarf free
As you say "engineer"
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Aye up, still going on this, just awaiting some more bits back from powder coating
Cast your minds back about 12-18 months to when i finally got it to run relatively correctly - i'm not sure if I ever mentioned it on here but during the process i tried running it without the turbo on and had the headers only loosely bolted up using the outside 2 bolts.
It fired up a treat but was suddenly pissing oil out of the front of the engine, seemingly from the upper exhaust stud hole on cylinder 3.
With a bolt in it it didn;t so much gush as weep a fair bit - i put this down to a ham fisted previous owner having cracked the head putting an over long bolt in
Now i've got the engine on the bench i had a proper look - what i found was less than amusing
At some point someone has snapped that particular exhaust bolt, then tried to drill it out....................................
Whats that......
It can't be can it?
Bugger me it is!
Drilled off centre, on the piss and all the fucking way through!
This should demonstrate just how far off straight it's been drilled!
So, rectified with a spot of Belzona for now
Now just awaiting a decent clean and a coat of paint
I've also spent a small fortune on some more Ti bling for various bits, cam cover bolts, sprocket nuts and a couple of other bits.
Also bought a manual cam chain tensioner to be on the safe side as i've got no idea of the heritage of the existing one
So, hopefully in the next couple of weeks if it warms up enough to paint, it'll be done and back in for the final build
Then we've just got to hope it plays ball during testing
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Ideally one big enough to do the full bank of carbs in one go but they're daft money
You may be better off finding someone who can do it by post
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1 hour ago, Scareraven said:
Emulsion tube ovaling is a new term for me. I pulled them and polished them.
Next time you have the carbs apart have a look down the emulsion tube where the needle runs, if it's massively ovated it'll let extra fuel through
I believe it was a big issue on 38mm BSTs with dynojet needles wearing the front edge
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53 minutes ago, Scareraven said:
The rubber plugs are on the pilot jet. I got them and put them on. Much to the anger of a couple of other threads. Huge arguments broke out over the purpose of those. But I want it running stick before I mess with anything. Thanks for the link! Will read.
Mine wouldn't run/rev without them in
I went round and round in circles for ages, emulsion tubes made the biggest difference
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13 hours ago, Scareraven said:
Floats were adjusted, and she fires right back up every time. Choke or no choke. Thanks for asking. Still trying to out think the problem.
Have you got the 4 little rubber bungs in the bottom of the main jet tube?
Have you checked the emulsion tubes for ovaling?
Sorry for linking to another forum but in my thread on Blandit Alley i went through a similar thng with my 400
http://forums.banditalley.net/suzuki-bandit-250-400/gsxr-k4-swingarm-swap/
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Bits all dropped off to the powder coaters - should have it back by middle/end of next week.
Might even be a roller again before Christmas!
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Aye up everyone
Bit of an update, decided that it was close enough to running properly to start pulling it apart for powdercoating/paint etc so i've got something to do over the winter
So it's in bits and i'm just finishing up a bit of tidying up on the frame (and removing a snapped off drill bit from the side of the frame?! that came with the bike)
I've also been finishing up my 1216
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1 hour ago, Reinhoud said:
Still not running propperly?
Ignition timing ok? What brand spark plugs do you have? The manual for my GS1000 says Denso or NGK, but it runs like crap on Denso..
I think it's an ignition problem.
I haven't tried it since i put a new spring in the fuel pressure regulator and made a choke stop so it may be ok now
Ignition timing is stock for now. Plugs are brand new NGKs
The choke springs are really weak so i'm thinking it's blowing them open, maybe partially, as it starts to boost
On the last test run with a big handful of clutch slip i did get it to rev past the stuttering point and pull pretty much up to the top end of the revs which is what makes me think it's a transition problem rather than ignition
Just haven't got a lot of time to test it
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On 9/13/2018 at 1:32 AM, Reinhoud said:
I just discovered this topic.. Nice bike to turbo.
I didn't read everything, but I read the bike choked at 6500rpm, is/was your plenum big enough? My bike had a bit of the same problem, turned out the plenum was too small, while someone who had a much smaller plenum had no problems at all..
Thanks boss, i think it should be okay, it's huge relative to the engine displacement, something like just under 4 litres if i remember correctly
I really need to get my finger out and sort this once and for all, it was pretty close on the last test run so i think another trip to the dyno before Christmas migt be in order
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On the 2nd picture, could be a link across to feed the +12 to each coil, rather than having 2 separate wires?
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That's interesting, stripped the fpr, no crap in it and the diaphragm is fine, then replaced the clipped spring with a new full spring.
Reassembled and put back on the bike, fired the pump up, that's odd, it's not showing any pressure?
I was under the impression that the Malpassi's were 5-6psi standard, so i wound the adjuster in and it took a good 3-4 turns to get it to just under 3psi on the gauge - not running at present.
Possibly more importantly, when I turned the pump off, the pressure remained on the gauge, which it didn't seem to do before.
I wonder if where i drilled out the return barb to increase the return flow/ reduce the return restriction is what has caused the base pressure to drop below the 5-6 stock psi?
In any case, i'll get it fired up asap and reset the pressure when it's running
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12 hours ago, Madb said:
Good thinking. you need to do that at least 5 times tho.
I'll have a look and see when I can get out on it next.
Going to strip the FPR later and got another idea to try too
If the next run is relatively successful it might be worth considering another trip to the dyno
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I might try and move the fuel pressure gauge to somewhere up the front then mount the go pro on the tank so i can watch the pressure and boost afterwards
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14 minutes ago, Madb said:
Yippee! i thought ya got stuck racing. haha Glad ya making some progress. seems ya find yer way bit by bit. shame ya didnt put a video clip up. would have love to here her scream! almost there, matey!
Getting there slowly, completely forgot to take the Go Pro to film it!
Mind you it would have been fairly anti-climactic if i'm honest
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Good Lord! An Update!
Progress, small but progress non the less.
Finally managed to find a suitable testing spot, so armed with a 12mm spanner and small screwdriver we gave it a go
I think it's still transition/fuel pressure related - the fuel pressure before definitely wasn't high enough so we wound it up to just under 3 psi with it running.
It's made it very rich at the bottom end but i guessed this would be the case
Gave it a run, second gear, and whilst it still stumbled at mid throttle crucially it eventually pulled through it and virtually revved out, and consequently scared the shit out of me.
So surprised was it that it had kind of worked i almost forgot to brake before hitting the main road! (which was also not very good having not bedded the new pads in) I also forgot to look at the boost gauge to see what it was doing
Few more runs, same result but getting worse for stumbling each time, interestingly it could be cleared by slipping the clutch through it
However, the fuel gauge was now showing no pressure despite not being touched, so i wound it up a bit further and the pressure came back, then went again.
I'm wondering if where i clipped the spring it's shifting inside the regulator causing it to fluctuate? Next step is to have the regulator back off and put the new spring in and see how low the pressure will go
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Turbo plumbing for a simpleton
in Forced Induction
Posted · Edited by El Gringo
Cheers Rob,
Just got it back from the bike show in London, Practical Spurtsbikes borrowed if for their stand over the weekend
(Excuse the shite in the background)
I'm hoping that with some fresh fuel (and not the half and half fresh and premix i put in it the other day ) it should start and do what it's supposed to do now i've sealed the float bowl tee's and put the choke bar stopper on