Paging the Turboisti

Apart from the obvious smoky turbo and engine death rattles, what should
I be looking out for if I was viewing a GPZ750 turbo?

Also, any major differences in the US<>UK models?

 

Ask the owner if it needs any special treatment. If he doesn't mention
letting it tick over for a while before turning it off, then proceed with
caution.

 

Why's that then?


Dave

 

Look at how much of a downpayment it'll get you on a decent modern bike.

 

at a guess, it lets the blower cool down while there's still forced
lubrication flowing.

 

Presumably to let the turbo spin down, you're supposed to do the same
with all turbos (inc cars), but in practice by the time you've parked a
car the turbo has spun down anyway. People mention figures of over
100,000rpm, so it makes sense to keep oil pressure up

 

Cos the residual heat in the turbo cooks the oil.


--
Krusty.

http://www.muddystuff.co.uk
http://www.muddystuff.us
Off-road classifieds

'02 MV Senna '96 Tiger '79 Fantic 250

 

STFU

I can't decide on a modern bike, the nearest I got was a Monster, but I
only want one of the latest ones - which are out of budget.

Anyway - how's your downpayment/SZR running?

 

It runs fine, I just can't be arsed to change the cylinder head bolts
for new ones that torque up properly.

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, mike. buckley

A slightly balding grey-haired chap with a big nose.

If there's one in the vicinity of the bike, run away, it's had its tits
thrashed off.

--
Wicked Uncle Nigel - There are few things in life more sinister than a
public toilet with the lid closed.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

I was actually waiting for an update on the turbo with a hole. Was it in
the hands of Sweller when it left a trail of engine parts on the road?

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, mike. buckley

Aren't they all?

--
Wicked Uncle Nigel - There are few things in life more sinister than a
public toilet with the lid closed.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

mike. buckley scribbled on the back of a napkin:

Not to mention that the turbo on just about anything can get red-hot
during prolonged use. If you cut off the lubrication at that point the
oil doesn't get cooked, it carbonises and your turbo is suddenly
spinning on sandpaper. Not recommended.

 

Ta for that. I had googled and found Lurcans site, but to be honest not
much else cropped up, I'll have another dig around.


What's part availability like? I saw Swellers when it was at Ginges
after Will got the rear puncture, and tbh I'd be happy to start with
something like that and build it into a nice bike, but there's not much
point if there's no prospect of parts. I think I've been spoilt with RDs
you can get virtually everything.

 

Wrong

 

I'm certain I'm not, but I'm always open to new ideas, so go on then...

--
Krusty.

http://www.muddystuff.co.uk
http://www.muddystuff.us
Off-road classifieds

'02 MV Senna '96 Tiger '79 Fantic 250

 

If you simply turn off the engine while the turbo is still spinning,
then the oil pump shuts down, obviously. But the turbo takes some time
to spin down to a halt.

With no lube being pumped to it. I don't have to draw a picture.

To be fair, I suppose this could be described as 'cooking the oil' but
it's more accurate to say that no oil is being supplied in the first
place.

 

That can happen if you kill the engine from highish revs, but a few
seconds at idle is enough for the rotor to spin down. Residual heat
cooking the oil is the real problem, & the reason you let it idle for a
few /minutes/ when stopping after a thrash. It's also the reason
Porsche fit a separate electric coolant pump to feed the turbo after
the engine's switched off.

--
Krusty.

http://www.muddystuff.co.uk
http://www.muddystuff.us
Off-road classifieds

'02 MV Senna '96 Tiger '79 Fantic 250

 

Does this also apply to turbo diesels?

 

Turbos are not blowers and no amount of "He's in a coma" will make them
so.