BMW 326rb build thread...

[Def]

Originally Posted by kouki_s14

The oil pumps dont go out, it is the cranks that have a small contact patch with the oil pump. The small contact eventually wears out from high horsepower or high RPM and stops driving the pump. Late model R32, R33 and R34 RB26s did not have this problem.

Which is a vibrations problem.

I saw a guy with an R33(I think) RB26DETT in his 240Z(sweet car), and he ate an N1 oil pump. I think he was turning 9k RPM, making about 700rwhp. Thing was as fast as Star Mazda around TWS - shame to see him leave.

[Dutchmalmiss]

IT'S BEEN A WEEK ALREADY!

Anything new?? I'm almost obsessing over this as much as the Transformers and GT5 threads. hahaha

[DJButton]

Originally Posted by ctnewman

i had a jun crank collar on my last RB

Nice I need to get a collar for mine still.

Not a vibrations problem really just a small contact patch so eventually it stops spinning the pump which shears the pump from the heat.

[ctnewman]

Originally Posted by Dutchmalmiss

IT'S BEEN A WEEK ALREADY!

Anything new?? I'm almost obsessing over this as much as the Transformers and GT5 threads. hahaha

just tinkering with bodywork still. sit tight!

in the meantime, istarted uploading content to:
http://onyxsyndicate.com/Newman/

i've got about 50% of the posts up.

[96Turbo]

Originally Posted by ctnewman

Cars, Snowboarding, Building cool shit, Playing Drums

Dude....you are a slightly older version of me!!!!!!!!!! I'm currently studying M.E. as well. Now lets see some more progress on this beast!

[ayuaddict]

soooo...

you mold them lines?

[ctnewman]

Updated! (i know it goes back to page 06 when you click next. that's because the link says 60, but since it corrects errors, it goes to 06 instead)

http://www.onyxsyndicate.com/Newman/...e30gtr_59.html

[Def]

Originally Posted by DJButton

Nice I need to get a collar for mine still.

Not a vibrations problem really just a small contact patch so eventually it stops spinning the pump which shears the pump from the heat.

I guarantee you the temperature the crank/oil gears run at doesn't reduce their strength any measurable amount. If you're shearing things off a rotating assembly after some period of time, it is 99.999999% of the time a vibrations problem. The load of spinning the oil pump isn't that much, the load of an assembly vibrating around against another piece can spike quite high and cause fretting and eventually fatigue failure.

[ctnewman]

Originally Posted by Def

I guarantee you the temperature the crank/oil gears run at doesn't reduce their strength any measurable amount. If you're shearing things off a rotating assembly after some period of time, it is 99.999999% of the time a vibrations problem. The load of spinning the oil pump isn't that much, the load of an assembly vibrating around against another piece can spike quite high and cause fretting and eventually fatigue failure.

I disagree. Loading the drive gear off-center AND partially is a huge stress riser.

Inline 6 cylinders are very well balanced.

[MeSs]

Is the cage finished?? looks abit low.. Sorry if im wrong, i havent read the whole thread.

[ctnewman]

Originally Posted by MeSs

Is the cage finished?? looks abit low.. Sorry if im wrong, i havent read the whole thread.

cage is low. I took it to a reputable chassis builder and came highly recommended, too. He builds full tube chassis cars all day. I think he rushed through my cage, which is a major bummer. Live and learn i guess.

http://www.onyxsyndicate.com/Newman/...e30gtr_46.html

[DJButton]

Ehh, like you say live and learn, cage is a little low, but long as you fit with some clearence for your head shouldn't be too bad, right?

Originally Posted by Def

I guarantee you the temperature the crank/oil gears run at doesn't reduce their strength any measurable amount. If you're shearing things off a rotating assembly after some period of time, it is 99.999999% of the time a vibrations problem. The load of spinning the oil pump isn't that much, the load of an assembly vibrating around against another piece can spike quite high and cause fretting and eventually fatigue failure.

Well I'm not gonna argue with you and clutter up this fantastic build thread, I disagree but no hard feelings. Back to the awesome BMW.

[ctnewman]

Originally Posted by DJButton

Ehh, like you say live and learn, cage is a little low, but long as you fit with some clearence for your head shouldn't be too bad, right?

Driver seat will have plenty of head clearance, passenger seat had to be kind of high due to tunnel interference. Anyone taller than I am (5'-9") will run the risk of having their head close to the cage.

[SoarerTurbo]

Very cool project. Sorry if i missed it but what are you hp goals?

[DJButton]

Originally Posted by ctnewman

Driver seat will have plenty of head clearance, passenger seat had to be kind of high due to tunnel interference. Anyone taller than I am (5'-9") will run the risk of having their head close to the cage.

Good stuff, hopefully I'll get to see it on the track at some point.

[Def]

Originally Posted by ctnewman

I disagree. Loading the drive gear off-center AND partially is a huge stress riser.

Inline 6 cylinders are very well balanced.

Balance has nothing to do with torsional vibrations. You are speaking of external vibrations anyway, which is not what I'm talking about.

The crank twists back and forth like a tuning fork vibrates, which is why the factory puts on a harmonic damper(i.e. the crank pulley).

Let me put it this way, you externally spin the engine to 8000 RPM and the oil pump gears won't feel much load at all. You start running the engine and the torsional vibrations in the crank will rise and fall according to the 2nd order mechanical response of the engine's rotating assembly. This vibration GREATLY loads things.

Yes, the structural design of the gear probably isn't ideal, but the reason why it is failing is because it can't put up with the stresses it experiences due to torsional vibrations. It's probably easier to calm TVs on the crank than to make things strong enough to deal with an unfavorable vibrations environment.

[thetopcow]

Ok, back to the build enough with the sidetracked torsional vibrations stuff. It sounds like an interesting topic but, start another tread about it. I bet other on here will have good info to contribute.

[ctnewman]

http://www.onyxsyndicate.com/Newman/...e30gtr_60.html

updates...

[300hp owen]

cool.
u gonna paint the interior in some wackydoodle way that nobody else has tried yet? I can just see you finding a way to make heat resistant plush velvet spray on floorpan coatings, or astroturf is always a good thing, lol.

[ctnewman]

haha, interior and cage are just going to be painted bodycolor.

[Dutchmalmiss]

Actually, a glow-in-the-dark cage would be phenomenal.

[ctnewman]

Originally Posted by Dutchmalmiss

Actually, a glow-in-the-dark cage would be phenomenal.

that's such a good idea.
http://www.mimousa.com/cii-lite.asp

[twofourzerosx]

weekend updates?

[ctnewman]

i was in houston for the past 7 days for work, and i'm relocating again... long story.

but expect paint on the car in the next 2 weeks.

[Rusker]

Can't wait for paint!

[ctnewman]

checking trans/seat fitment. LOL...

http://www.onyxsyndicate.com/Newman/...e30gtr_61.html

[SmittyDa3rd]

newman were you on the QEW headin towards toronto this morning in your lotus?

[GSXRJJordan]

^^^ I believe he sold the Lotus for the Range Rover.

[SmittyDa3rd]

my bad...seen a red lotus with a new york licence plate..sorrrryy

[ctnewman]

progress slowed, had to strip down my sti transmission:

http://forums.nasioc.com/forums/show....php?t=1497692