Build thread (finally :D)- 85mm Garrett TV8101

[racket]

The gases need to flow smoothly into the turb scroll , so no steps or projecting bits , the gases are travelling pretty fast

[wannabebuilderuk]

Is the rectangular profile elbow a potential issue or should I aim for pipe and would 3" be too restricting?

[racket]

Your flametube is circular , you need to "smoothly" change that "large" cross sectional area to the scrolls "small" rectangular entry cross section , how and where you do it is up to you , I've already mentioned to you in PMs the potential problems and losses associated with using an elbow rather than a straight in "sore thumb" arrangement

[wannabebuilderuk]

Yea I've figured out how I'll taper the f/t to the elbow, thinking about it I'll just do the rcdon way of the rectangular elbow as it'll not be as good as a circular profile but easier to figure everything out

[wannabebuilderuk]

Update time.

Fuel pump motor has arrived, £36.


Went to my favourite bus scrappers again and scored this cooler that may be usable.


Short section of pipe before the sheared bit is 15mm and the large double ring bit is 22mm so I can use a 22mm compression fitting on both sides since pipe nub is glued into the 22mm bit so don't want to have it blow out if the glue has lost its grip.


Turns out some of the buses use hydraulically powered fans if they can't be directly connected to the engine so got one of the motors to have a look at since its a gear style setup so might be usable as a pump in the future.

[wannabebuilderuk]

Nice little gear motor, might be usable as a pump by blocking off the drain port but not a hydraulic motor/pump engineer so anyone able to confirm?

One bastard bolt was rusted solid so the head ground up (further adding to my hate of these style of bits, Allen keys are superior) so took some Jeremy Clarkson version of gentle persuasion.

[wannabebuilderuk]

Well after freezing my feet off the cooler is clean of coolant (tastes lovely....) and the 22mm compression fitting olive fits perfectly so I'll use a 22mm to 15mm fitting to join to the rest of the 15mm system.

*edit



7mm o ring (1.8mm section) stretched out fits onto the 20mm groove filling it out and would provide a nice seal if the 22mm olive doesn't compress completely due to the groove.

[wannabebuilderuk]

Aluminium is rather fun to drill, not looking forward to tapping though..

[wannabebuilderuk]

finished the pump plate, if I was to do it again I'd use a solid block and machine channels in it but beggars can't be choosers and since the aluminium cost me nothing I'll use it. As for the compression fittings being close I'll buy some elbow ones - www.ebay.co.uk/itm/124234192771

Which should solve that plus allow me to position the motor closer since 15mm has a bend radius of 100mm and I want this compact as possible - hopefully the elbows bottom out in the right direction or I'd have to use some thin washers to make them finish the direction I require (going left on the front view)

[wannabebuilderuk]

Anyone know of one of those little circuit boards that can read a 0-5v pressure transducer and output a 0-1000 display?

Want a remote fuel pressure gauge as full throttle will be 600psi and can get one of these www.ebay.co.uk/itm/383302628898 just need a way to display that 0-5v.

*edit

Two possible items?

www.ebay.co.uk/itm/264874199590

h5.aliexpress.com/item/32958182779.html

[wannabebuilderuk]

Fuel pump has arrived, over a month earlier than expected and well packaged

I do love how they got it through customs since its £40 hehe

[wannabebuilderuk]

Questions for all -

On the oil system I need 3 connections for sensors, one 1/8 bsp for the fuel pump pressure switch and two for oil pressure and temperature which are 1/8 npt.

First question - setup will be oil pump to cooler then cooler to turbo inlet, so would having the sensor connections just after the cooler be okay?

Second question - would using a cross like this work?

I was thinking of using that and then 3/8 to 1/8 bsp/npt reducing bushings for the sensors or would three 15mm compression tee fittings in a row with the offset compression taking a 15mm solid plug that's drilled and tapped 1/8 bsp/npt be better?

Or just a simple thick aluminium block that's got a hole straight through and 3 tapped holes perpendicular to the main hole, with 15mm compression to bsp male screwing into the ends of the main hole?

[wannabebuilderuk]

Scrap all that, I'll use the 15mmx22mm reducing compression fittings I bought for the oil cooler (the 22mm bit was actually just a ring 22mm od 17mm id glued on but glue failed so will just tig a 15mm pipe in the existing 17mm od 15mm id pipe stub the rind was on).

I'll make a 22mm bit of aluminium bar with an 8mm hole that'll give a wall thickness of 7mm which I'll drill and tap the for the three 1/8 bsp/npt ports I require. Or would a 22mm mild steel bar with a 12mm hole and 5mm wall be better to not restrict the flow and since its steel the wall wouldn't need to be extremely thick or would 5mm be too little for tapping 1/8 bsp/npt?

*edit 5mm look ok

[userscott]

Sept 23, 2020 4:36:27 GMT -5 wannabebuilderuk said:

So at 235mm dia between centres on the 260mm 5mm flange that's a circumference of 738.27mm so that's 29 bolts at 25.45mm between bolts.

On one hand that'll be a nice aviation look to it but fuck drilling and marking that lol.

What thickness do you suggest then, 8mm with 15 bolts spaced 49.2mm apart?

Would you definitely manually make this plate by drilling and marking? If you’ve got it in CAD send the drawings to your local laser cutting place. My end cap was about £8 fully machined from 6 mm stainless!

[wannabebuilderuk]

Hi Scott,

I found a place who quoted the 2 flanges and end cap for £66 so went with that - it includes the metal/cutting/machining holes/delivery and tax.

Surprisingly all the nearby places were £100+ and this engineering company on ebay was the cheapest www.ebay.co.uk/usr/gbsengineering

www.gbsengineering.co.uk/