r33_racer

You need more pictures of everything so we can see whats going on! Pretty please?

That is true mate. But im always doing or trying to do something crazy and overly time consuming. Good news the race car is finally running. Needs to get tuned to suit E85 now and then its time to actually get back on the track. Stupid cars, you fix one problem, then another problem thats never been an issue pops up. Fingers crossed there are no more! The rings appear to be sealing perfectly now since I assembled this motor dry. No oil vapours out the exhaust and nothing out of the dry sump tank breather. Just as it should be! Dont burn it to the ground if thats the case...just swing it my way! :)

Very interesting. Im always keen for new things! Keep us apprised!

Ive been slowly working on the manifold during the week. Its quite time consuming to make all the joints line up nicely. Im half way through the second runner and the third runner is all tacked and good Im waiting on some more short radius 90 degree bends to come in. But with all this stupid flooding, transport mobs aren't working, so I dont know if I will get them before the weekend. Which sucks as I was hoping to put in a big weekend and get it finished! I also have a set of camshafts coming from Kelford. 280 deg 9.35mm lift which hopefully will arrive before the weekend assuming the flooding doesnt cause issues there too Natural disasters can blow me!

Use 1 1/4" buttweld fittings. Have a look in the fabrication section. THere is a thread where somebody was making a log manifold.

Yeh whats the latest! This combo is looking quite promising.

Yeh its been alot of fun doing all this so far. I love it.

Dude, best car carrier ive ever seen. That is truly awesome!

I like your torque plate. Using an old head! Perfect.

Why thank you Justin. Hopefully it all pans out nicely with little drama.

Got the motor in today and partially hooked up. Fiddled with the turbo fitment and got it pretty good. Its starting to get interesting!

Duncan. Two cars...My god man! Im jealous lol. So will the cheaper one be quicker???

Nice video! The old rb20 sounds great. That cage looks like a beauty too. When you going to convert it to a full race car?

From memory i think its a 1.4 PR. I was running it at its max rpm before. Only dropping it a couple thousand rpm. They only take about 1500rpm to make positive pressure, so I would think they can make some boost at about 10,000rpm. Which is about as slow as I can get it after seeing how small a pulley I can fit on the drive. I dont think I will hit the 8000-9000rpm I was aiming for. I guess I will find out when its running just what boost it develops. Just gotta disconnect the turbo from the intake and give it a rev.

I finished the sump this afternoon and got the motor sealed up finally. With the new extension which has some basic baffling in it, the sumps rough oil capacity is now about 6.5L

Yeh I am lucky to have access to all the machinery and tools at work. It certainly makes doing these kind of custom projects easier. I dont know if ill really be losing that much boost down low, as the belt was slipping before and made x amount of boost, im guessing by turning it slower and having less load on the belt without it slipping I may just make similar boost. But I wont need to make that much out of it anyway since it will multiply whatever the turbo adds into the mix. Having the superchargers intake vacuum helping spool the turbo plus the added exhaust gases from the down load boost will also help spool the turbo I dont think there will be much to worry about in terms of losing down low power. Rolls its a Mr Turbo T76 I think. He tells me its rated at about 850-900hp.

Spent half the day making the merge collector. It came out pretty good. I made it with a 25 degree merge angle to help keep it all low and spread out so it should make it easier to plumb up with the little room I have between the flange and bonnet. The rest of the day I spent nutting out the sump mods. Got a mud map drawn up and found a strip of mild steel sheet which should be big enough to do the job. Only got the pan cut off ready to be cleaned up to take the new extension after I fabricate it. Time to go home and get wasted! Happy New Years peoples!

Yeh im hoping the compressor housing and wheel will muffle the noise as the charger sucks through it. I also got to machine up another pulley to slow the charger down which im hoping will help reduce its noise as it wont be spinning as fast. trying to drop it down to about 8000-9000rpm from the current 14000rpm.

lol you are not wrong! Its quite depressing spending more time working on the cars then actually racing them! We will all get there though!

lol I would like to have my own race car that is purely of my own ideas and none of dads. As im sure you know he doesnt let me do many if any of the crazy ideas I come up with. How did you like the new setup with the race car Noel? Doesnt the mechanical fuel pump look trick? Lol can thank the gibson motorsport GTRs at lakeside that day for that one! I tidied up the boot and fuel system. Remade the tank in stainless which came out pretty good, lol dont like the surge tank though, its made of 0.9mm thick s.s and that is a bastard to weld. But the boot looks a whole lot nicer now with fewers pumps and a much nicer tank!

Update time. So over the last two weeks ive rebuilt the motor. I got some new rings as my old ones were shot from an overheat I had before I started the supercharger project, it was a failed waterpump that caused it. Got some sweet new conrods from Spool (Brad) and a collar and pump. Thanks Brad. He is a top bloke and has great affordable parts. Also got some second hand valve springs out of the race car head which were better then my factory springs. The last two weeks have pretty much consisted of pulling the motor out and stripping it to get the crank polished and collar fitted. Drilling and tapping the main oil gallery in the block to suit some bspt grubscrews front and back, drilling and tapping the crank and cleaning all the crud out of it, honing the bores in the block so the rings have a fresh cross hatch to bed in, gapping the new rings, checking main and big end clearances, balancing the conrods and pistons and then assembling it all. I stripped the head and cleaned it all out and then fitted the new valve springs and put it all back together except camshafts. I want to get a set of kelfords or camtech cams while its apart. But I gotta wait until they get off holidays. Then I just need to modify this sump and I can fully seal it all up and chuck it back in so I can continue working on the twincharging stage. However while its out ive been dummy fitting the turbo and I got the flange supported roughly where I want it with the turbo bolted up to see how its going to all fit and work. Its looking pretty promising at the moment. So far so good! Anyway here are some photos of everything so far. Note that I did write a much much longer post about everything in a lot of detail but I accidentally hit back on the mouse and it all got wiped. Its too late for me to go writing it all again so this is the shortened version. Hopefully the picures will explain it all better.

I was going to suggest valve guide clearance and condition of stem seals also... on lift off the high vacuum can pull oil down through the seal around the valve guides. Maybe after sitting around for so long the seals went dry and got damaged when you first started it up again???

Well i picked them up. They are what they said. acl race series mains and big ends.

Thats odd. The local shop down the road just orderd me some new rb25 bearings from the factory in tasmania.... unless he is telling fibs!

Short answer, main bearings YES, conrod bearings NO.