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Classic Mini Engine Cad Model


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#1 psoutzis

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Posted 25 November 2020 - 12:38 PM

Hi all, 

 

I am currently trying to create a CAD model of a 998 engine. The inlet and exhaust champers were easy to create but i also need to design the cooling champers in the engine head and block. Do you know if there are any available diagrams or pictures that show the cooling champers (paths) in the engine head or block ?

 

Any help would be appreciated

 

Thanks

 



#2 Gilles1000

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Posted 25 November 2020 - 01:51 PM

You can have a look in the Vizard book, I'm pretty sure there are pictures with cylinders head cut to show the cooling chambers.

For the block I do not know where you could find them.



#3 MiniMadRacer

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Posted 25 November 2020 - 03:23 PM

You could try asking MiniSpares, they have an engine in the shop cut away to show all the innardss, its a lovely piece of work but it may be a 1275. They might take a pic of it for you, though with COVID I suspect the shop is closed and mail order only



#4 r.tec

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Posted 26 November 2020 - 11:10 AM

https://grabcad.com/library/culasse-3

I am myself trying to model a inlet channel with chamber and cylinder for CFD, but I am not yet very firm in CFD so this will be something new to me:

 

Attached Files



#5 psoutzis

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Posted 27 November 2020 - 11:36 AM

wow thats interesting ! would love to give it a try on ANSYS, could you send the CAD files over ?! 

 

This is my modelling of the cylinder head designed and rendered in Solidworks.

Attached Files

  • Attached File  111.JPG   18.71K   1 downloads
  • Attached File  222.JPG   19.12K   3 downloads
  • Attached File  5.JPG   21.7K   4 downloads


#6 r.tec

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Posted 27 November 2020 - 06:39 PM

Looks great! Much more realistic than the head on grabcad. Valves, Terry-springs and rocker-assembly seem to be very similar to my models I put on grabcad. Would .stp files be sufficient for CFD?



#7 psoutzis

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Posted 27 November 2020 - 07:11 PM

Thanks mate !
It’s better to get all the files in case there’s any error to fix it.
If you can send them to my email: [email protected]
You can send the with www.we transfer.com !

#8 Gilles1000

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Posted 03 December 2020 - 05:48 PM

Is that a real inlet manifold that you redesigned?

 

I'm currently having a go at designing a home-made intake for my Mini.

Removing everything before the carb, putting there an airbox and stub stacks, plus a tube from the front of the car with a filter box.

 

My biggest issue now is the clearance between the carb and the bulkhead when having original or Minispares intake for single HS4.

I will somewhen need this to know how big (or small) the airbox has to be :)

 

I will only be able to take measurements during Christmas, I am currently far away from the car...



#9 r.tec

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Posted 03 December 2020 - 06:00 PM

It's not the manifold but the inlet channel after my grinding it. I took the measures as good as I could. I also made a silicon model by pouring liquid silicon in the channel but I am still trying to get my 3d-scanner (Horus) to work properly.



#10 nicklouse

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Posted 03 December 2020 - 06:17 PM



Is that a real inlet manifold that you redesigned?

 

I'm currently having a go at designing a home-made intake for my Mini.

Removing everything before the carb, putting there an airbox and stub stacks, plus a tube from the front of the car with a filter box.

 

My biggest issue now is the clearance between the carb and the bulkhead when having original or Minispares intake for single HS4.

I will somewhen need this to know how big (or small) the airbox has to be :)

 

I will only be able to take measurements during Christmas, I am currently far away from the car...

Saw these on Facebook earlier the carb inlet might be of some interest.  No idea what they are actually from though. May be some locally produced part.

 

slYMjs3.jpg



#11 luismx123

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Posted 03 December 2020 - 06:47 PM

 



Is that a real inlet manifold that you redesigned?

 

I'm currently having a go at designing a home-made intake for my Mini.

Removing everything before the carb, putting there an airbox and stub stacks, plus a tube from the front of the car with a filter box.

 

My biggest issue now is the clearance between the carb and the bulkhead when having original or Minispares intake for single HS4.

I will somewhen need this to know how big (or small) the airbox has to be :)

 

I will only be able to take measurements during Christmas, I am currently far away from the car...

Saw these on Facebook earlier the carb inlet might be of some interest.  No idea what they are actually from though. May be some locally produced part.

 

slYMjs3.jpg

 

these come from innocenti 90s i believe. Friend of mine has a few of these filter necks around. They were mounted to the carb face, then a pipe connected the neck to the filter box which was positioned on the RH side of the car, in the area where a mini has its tower bolts. not sure if they then had a ram air/tube to fresh air infront but yeah...



#12 Gilles1000

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Posted 03 December 2020 - 07:15 PM

@Nicklouse: they do look good!

 

@Luismx123: I think you're right: Link

But very hard to see... But it seems they also took the hot air from the engine bay

 

My idea at the moment is following:

 

I have done (very) roughly the carb in grey. Length and dash pot are about right.

The airbox plate will be screwed on the carb with the stub stack / ram pipe

I plan to build some pipe to get fresh air from the grille.

 

PCCUPYxl.jpg

 

I did two versions of the ram pipe for clearance reasons,but I think the bented one is less efficient in regards of flow due to the different length on top and bottom.

F0P9Vffl.jpg

 

My concern at the moment is if the the box fits in the engine bay, this will tell me how long the ram pipe can be, where I read longer is better for low torque.

 

Gilles



#13 nicklouse

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Posted 03 December 2020 - 07:51 PM

@Nicklouse: they do look good!

 

@Luismx123: I think you're right: Link

But very hard to see... But it seems they also took the hot air from the engine bay

 

My idea at the moment is following:

 

I have done (very) roughly the carb in grey. Length and dash pot are about right.

The airbox plate will be screwed on the carb with the stub stack / ram pipe

I plan to build some pipe to get fresh air from the grille.

 

PCCUPYxl.jpg

 

I did two versions of the ram pipe for clearance reasons,but I think the bented one is less efficient in regards of flow due to the different length on top and bottom.

F0P9Vffl.jpg

 

My concern at the moment is if the the box fits in the engine bay, this will tell me how long the ram pipe can be, where I read longer is better for low torque.

 

Gilles

Giles. Lose the box if you can.  If you can’t shift the hole rear wards or move that wall further away from the ram pipe.

 Do you have any flow simulation software? I would be looking at a nice long curved pipe. Maybe with a divider on the bend to help keep the area of flow “even”



#14 Gilles1000

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Posted 03 December 2020 - 09:25 PM

@psoutzis, if you feel I am hijacking your post, tell me, I will open a new one, but as it is still about concept and design I think it's ok to go on...

 

nicklouse, thank you for your comments!

My idea is to get the coolest air to the engine to improve its density. without the box it would suck quite hot air as sitting just above the exhaust.

Plus the box's job is to avoid having too much turbulences around the intake. 

 

I know the rear side of the box is quite close to the mouth of the ram pipe, but hey, I have to deal with the original concept of the Mini ;).

At the moment I have 100mm between the hole and the axis of the ram pipe. Isn't it enough?

Even now, I fear the box is already too big for the bulkhead clearance...

 

My assumption at the moment is, looking at the original elbow for the HS4, this one is about 50mm long, so I cannot go bigger as the elbow is already auite close to the speedo hole.

 

As my car is an LHD, I do not have the clutch and brake master cylinders in the way on the right side so I could go further with the intake of the box, although would it flow better?

 

I do not have a flow simulation software, to be honest I didn't look for it.

What I forgot to mention is I am playing with the idea to build a small homemade flow bench as a side project (not sure how effective it is) to try the different setups I showed.



#15 nicklouse

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Posted 03 December 2020 - 10:03 PM

@psoutzis, if you feel I am hijacking your post, tell me, I will open a new one, but as it is still about concept and design I think it's ok to go on...

 

nicklouse, thank you for your comments!

My idea is to get the coolest air to the engine to improve its density. without the box it would suck quite hot air as sitting just above the exhaust.

Plus the box's job is to avoid having too much turbulences around the intake. 

 

I know the rear side of the box is quite close to the mouth of the ram pipe, but hey, I have to deal with the original concept of the Mini ;).

At the moment I have 100mm between the hole and the axis of the ram pipe. Isn't it enough?

Even now, I fear the box is already too big for the bulkhead clearance...

 

My assumption at the moment is, looking at the original elbow for the HS4, this one is about 50mm long, so I cannot go bigger as the elbow is already auite close to the speedo hole.

 

As my car is an LHD, I do not have the clutch and brake master cylinders in the way on the right side so I could go further with the intake of the box, although would it flow better?

 

I do not have a flow simulation software, to be honest I didn't look for it.

What I forgot to mention is I am playing with the idea to build a small homemade flow bench as a side project (not sure how effective it is) to try the different setups I showed.

Giles. Have you seen the info on CalverST where he did the KN filter test.

 

having a plate  opposite the carb opening seems to do strange things. Not to mention the noise. Which is why I am suggesting a bend






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