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Not-a-number

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Posts posted by Not-a-number

    Bugatti T57/59 engine

    in Project Discussion

    Posted

    2 hours ago, Testament said:

    some real serious machining gear there - where is that/what type of gear is it?

     
    Its at Fisher and Paykel PML. Not sure of the exact machines but they have some pretty amazing gear. The last photos are on a 4 axis to do the angled cam and exhaust faces + valve guides etc.
     
    They can do some seriously good work!
    • Like 1

    Bugatti T57/59 engine

    in Project Discussion

    Posted

    13 hours ago, yetchh said:

    Shit there's some meat in those bores..

    That photo is with the bores undersize. They then go in with another tool to size it and do the combustion chamber bowl. Then there is about 4-5mm on the walls. Really prone to cracking so I have thickened things a bit.

    • Like 3

    Bugatti T57/59 engine

    in Project Discussion

    Posted

    33 minutes ago, flyingbrick said:

    55kg! Jesus! 

     

    Does it still need a flywheel? :shock:

    You can see this one doesnt even have any counter weighting. Its just round! The later ones were counter weighted and weigh about 35kg. Still a monster!

    Has a multiplate clutch which I guess acts like a flywheel.

    yS9v1oX.jpg

     

    • Like 8

    Bugatti T57/59 engine

    in Project Discussion

    Posted

    Thanks, I guess you are using ABS? PLA doesn't smooth very well with any solvents I have found unfortunately. Your patterns look so pretty compared to my junk haha. 

     

    What grade aluminium ingot are you using? Any plans for heat treating before machining or is it hard enough fresh that it will machine okay? 

     

    Yeah ABS.

     

    Ali is LM25 which machines pretty well as it is or can be heat treated. I havnt had any heat treated so dont know the difference in machining.

     

    Investment casting is a little different since you have to get all the gas out properly. Im guessing youre casting into the PLA or do you burn/melt it out first?

    Bugatti T57/59 engine

    in Project Discussion

    Posted

    Nice work! What post finishing process are you using on the 3d prints? They look great, keep up the good work. 

     

    I've been playing around with some aluminium casting using 3d printed patterns. Are you using nomograms to work out your filler & feeder systems? Made quite a big difference to my castings actually going to the trouble of specifying the gate, runner, sprue top & bottom areas. Although I'm investment casting down to 3mm wall thickness so likely a bit more picky than sand. 

     

    On the patterns that need a good finish I print at 0.14-0.19, inner patterns that you cant see I do 0.25-0.4. Rip into it with 120grit then I spray it with acetone. Usually you use acetone to make it stronger but in this case it seals the plastic really well so when you spray it with a primer it works mint.  Then give it a 600grit.

     

    The sand doesnt pick up that much detail so you can be pretty rough with the finish. Then give it a wax mould release and good to go.

     

    I havnt used any programs for working out the runner system. Ive got some good casting books that give a couple of formulas and rules. Iv pretty much just done what theyve said and its been working.

     

    Ive now got a good ratio for runner size vs volume for iron and ali. This will be the first bronze one.

    My wideband o2 is broken! Anyone got one to sell?

    in General Car Chat

    Posted

    Ive got an innovate MTX-L which has a bosch LSU4.2 I think. Anyway its been running mint for 2 years and just yesterday took it out and unplugged it to get the headers out of the car to weld a new muffler on.

     

    Put it back in and now doesnt work. Reads 7.4 or 22.4.

     

    I think I did a couple of tack welds before taking it out. Could this blow it up? Earth was right next to the weld.

     

    Any way of testing these to see whats wrong?

     

     

    Anyone got one for sale that I could get before this Friday?

     

    Need one with this plug

    https://images-na.ssl-images-amazon.com/images/I/618Yqo8z%2B8L._SL1500_.jpg

     

     

     

     

     

     

    Bugatti T57/59 engine

    in Project Discussion

    Posted

    A friend of mine has spent over 20 grand on patterns for Norton dominator barrels, then it costs 1000 to cast each one and 1500 for mechaning,

     

    I can imagine! There was 1000hrs in this block. So easy $50k if I paid someone. Who did he get to design/make his patterns?

     

    All the patterns for the block cost about $500, casting was $400. All mates rates though. To machine I have had quotes between $6-9000 for the first one, $4000 after that but I should be able to do it on my machine.

     

    There are 2 places in Europe who can make blocks and they charge about $17k with a 1 year lead time. :shock:

    • Like 3

    Bugatti T57/59 engine

    in Project Discussion

    Posted

    This is amazing, you have such good pattern making skills, do you think you could do a 99a flathead v8 block? I can supply you with old blocks and possabley 3d drawings of everything.

     

    Anything is possible but the amount of time it would take would be huge. So youd need really deep pockets! :D

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