r33_racer

Very nice manual mill work there!

I was going to suggest that the timing covers are 'off' early this morning....but I didnt have anything to compare too. Just checked out the pictures again. Drivers side high point been ground down... lol just looked again and now im not so sure

Fresh off the mill! Mk 2 front face supercharge plate, now including built in belt tensioner slot and adjusting bolt flange

I had a quick look, I cant see if anyone suggested two different engine mounts???? Perhaps an rb20 mount or rb25 one on one side and standard on otherside??? Does that class as outside the box???

Good that you got it sorted. I was going to suggest a carbide drill.

What weve done in the past is weld a piece of pipe (3-4" long), same as your intake size to a flat plate and clamp it into your turbos intake and on the flat plate end you want to put an air valve, either nitto type fitting or tire valve and when its clamped on hook your air line up and set the desired pressure and run it at that until either hoses pop off or you find where the air is leaking from. Alot of time its just i/c piping not clamped in square or a slight cut in a hose thats torn through.

Very nice Noel! Welcome to the club brother!

lol yeh that is a very cool thought. It has crossed my mind and did infact when i was deciding which one to get for my road car. But they told me to go for the 2.1L first and that I would be very pleased with it. Time will tell!

TBH i think my problem will be a massive lack of traction. Having so much torque down low will really make it hard to go anywhere. I've been trowling through BMW forums and there are quite a number of them with these s/c's on them only running around 300-350hp (on about 9psi), not sure if thats at the wheels or engine and they claim to have alot of trouble with traction as the onset of power is just so brutally hard and fast. They are running a smaller unit then the 2.1L I've got also. They also mention that the power is so linear and easily controlled with the right foot once youve adjusted to it. Im quite excited about this! Back on the bracket, I buggered up the original one when I went to put it back together last night with the new mods. So the new front face plate will now be made out of a 30mm billet block of steel on the CNC mill and have the spacer bushes incorporated into it

Well im hoping for 300rwkw with alot of mean low down poke. I imagine having more low/midrange power with decent top end will make me faster then an equivalent turbo'd 300rwkw car.

Forgot some pictures of the bracket itself. Hopefully this afternoon ill modify and remachine the block plate and it will be as good as I can get it

Yeh will definitely have to fabricate a set of headers, though I dont know if they will be well designed as ive never made a set before, but ill be doing my research before I start. I should have taken some more shots showing just how little space there is left around the thing. But im thinking 2" primaries, with 2 x 3into1 collectors which go to 2.5" and then merge into a 3" which will then goto atleast a resonator and muffler and then probably another muffler where my cannon is now. Im expecting this thing to be quite loud and I want it to be sleeper quiet. Yeh Duncan the other shed is actually the family business. Which is where I keep going to either use machines or raid material I need or get stuff made on the CNC's. It is very handy to have these machines available. Yeh we will be racing the rb30 this season. We had a practice run at lakeside the other week, actually my old man ran it cause he likes lakeside. Seems to be a trend, old people and lakeside. Anyway in this motor we've put in total seal gapless rings. Whats happening, or so we are speculating is that the increased ring seal (which is netting us 170psi comp and 2% leakdown) at idle is increasing vacuum and its pulling oil down around the valve guides/seals or our other theory which to me seems more sound is that the ring end gaps on the second and third ring are way too loose(2nd =0.032" 3rd =0.038") and they arent doing their job properly. Basically at idle its burning alot of oil but as soon as its under load, she clears right up and is sweet until its back at idle. So we are pulling it out and down and changing over valve guides to new ones weve just made from phosphorous bronze and new stem seals and putting the std second and third rings that came with the pistons back on them. Then go racing with Noel

So after the weekends effort I got the bracket tacked together and it succesfully holds the supercharger nice and square to the block and looks pretty tough. However the intake to the supercharger will run into the engine mount. So now the blockside bracket needs to be re drilled to lift it all up about 10mm which should help clear the engine mount issue. That and the supercharger was only sitting above the chassis rail by a couple of mm. Yesterday i had to run to work and back about 3 times before I could actually assemble the bracket, but due to my old mans welding helmet being broke I ended up doing it today as I had to go back to work and get my helmet. There was so much mucking around I nearly went insane. First few times I had to mill down the main front plate as it was too thick and then make a shelf/brace which links the front plate and block bracket together and acts as a shelf for the charger to rest on so it takes alot of the weight off the front bolts. Also had to go back twice to mill down the length of the blockside bracket as it was going to run into the belt. Finally after it all goes together nicely I now have to pull it apart to change it It takes a long time to get anywhere with custom stuff, especially by yourself. I was expecting to have the bracket fully finished on saturday.

Bam! What he said Look below for details.

The last two major pieces done today along with a few other small things which I didnt take pictures of yet. The steel one is the front face plate, and the trick looking one is the inlet to the supercharger

You better believe it Noel! Dad said you were coming round this weekend? Sorry to hear about your loss too Will catch you on the weekend and you can see it in the flesh!

BAM! Got two done today! Hopefully knock over the rest tomorrow! Those two came out about ten times better then I had pictured.

lol yeh thats a valid point.

Looking very good! I love how your taking your time and getting everything just right and how you want. Well it appears that way from the outside anyway.

Finished drawing up the rest of the flanges and bits. Hopefully get them made this week inhouse on the CNC mill instead of getting them laser cut. Mill has become free, so im going to try and sneak in my stuff before actual paying jobs come through... Just some more 3D models of the parts to be machined. The inlet manifold flange will have, though not drawn atm, a taper across its depth that transitions from 72mm to 82mm to match up with the opening size in the greddy plenum where the throttle body usually bolts upto. The 72mm size to take a 3" pipe ontop which will be attached to i/c piping. The discharge port flange will have a similiar thing done also, except it will transition from its triangularish shape to a 3" round hole over its depth so I can tig on a 3" pipe. The supercharger inlet flange will basically have an oval section linking it to the new throttle body, hopefully maintaing the same size and shape from flange to throttle body flange so it doesnt restrict airfow to the charger. Fingers crossed, by the end of the week ill have a working bracket that *might* hold the supercharger next to the block!

Isnt the top of the piston (around ring land/top ring) usually about 40 thou smaller then the skirt? Or does that part expand so much that it uses up the extra clearance whilst running at operating temps? Maybe im wrong, I was always under the impression that piston size is based off skirt diameter...

Unless I worked that out incorrectly, thats only 2.8 thou of clearance. I assume the piston size is 87mm at the skirt? .07 is only .0028" Unless your measuring devices are not accurate enough??? What if the piston to bore was too tight, not too excessive? Would the rubbing show up much the same? or would it be in four corners instead of just two?

Very neat and tidy install there. Looks great!

It looks like the skirts were rubbing. What did the seal line around your rings looks like?

Saturday I was able to move my car into the shed next to the race car. Continued stripping stuff out and measuring some more. Its all changed again! Ok so I pulled all the aircon out and old manifold/turbo setup. I can now use half the power steering and half the aircon bracket holes to put my mounting plate on. Its even easier now and I can lay the supercharger down horizontally, which means I can just use the oil bath tank in the front and not worry about running a feed and drain to the motor as per my original ideas. New bracket revision. Assuming ive got it sorted properly, I can send these off to get laser cut this week and then start welding them up! I will have braces across the top and bottom areas which I will just hand make and add in when putting it all together. Hopefully next update will actually be the bracket being put together.