Northstar rebuild: Will style (Page 64/119)
Bloozberry DEC 19, 01:11 PM
Hey! Your thread finally found a new home in the Construction Zone! Long overdue if you ask me. As for the oil filter, maybe I'll wait until my birthday... (cough, cough) they're nice but they're aweful pricey! I noticed when they say they'll pay for themselves, they specifically don't mention over what period of time! How did you find cleaning it? Easy?
ALLTRBO DEC 19, 01:46 PM

quote
Originally posted by Bloozberry:
Hey! Your thread finally found a new home in the Construction Zone! Long overdue if you ask me


Glad I could help.
For now, the threads need to be 'nominated' and worthy of the section for Cliff to move them here, as described at the top of the forum. So if you see a good build thread that isn't here yet, send a simple PM and it'll probably be moved.

Now that Will's car is (finally!) running (again!) and mine is almost complete (until the next mod gets installed anyway) and soon to be back home from the Haus of Guru, it's time to think about vids of mountain runs.
I just need to throw together a solid camera mount for MIDTRBO.

------------------

'88 Fiero GT - Project MIDTRBO
'10 Camaro LT/RS
There's no replacement for turbo placement

Will DEC 21, 10:18 AM
Mountain runs need to wait until the weather warms up.

I put the oil filter back on and took the car for a spin Sunday night. I went down to a shopping center in the next town and turned around. As I was getting back on the highway, I was behind some WWD Ford thing. I moved over to the right lane and punched it in 2nd and it broke loose. Caveats: very cold pavement, salt on the road, yadda yadda... but it *DID* break loose from a roll in 2nd

The prescribed method of cleaning the filter is to spray brake cleaner from the inside out.

When I changed the break-in oil, I found the moly disulfide grease shown above in the oil filter. I tried lacquer thinner, brake cleaner and a trip through the dishwasher, but those methods were not effective. I finally scrubbed it with dish soap, hot water and a tooth brush to remove enough that I was comfortable reinstalling the filter. Brake cleaner may be good for later oil changes, but maybe not so much for the first when the oil is full of assembly lube.

I also replaced the front main seal, which was leaking between the seal OD and the front cover. I permatex'd the OD of the new seal. It hasn't yet accumulated enough run time to check that again.
Obviously for the front main to be replaced, the balancer must be removed. I reinstalled the balancer and tightened to the torque spec from the '97 manual that I have: 37 ftlbs + 120 degrees. For '95 or '96 the balancer bolt was reduced from 18 mm to 14 mm. The torque spec only changed from 43 ftlbs + 120 to 37 ftlbs. This seemed a little weird to me, but 'tev. The balancer clamps a sleeve that drives the oil pump. The sleeve has flats that provide a positive drive for the oil pump, but the crank only drives the sleeve via the clamp load from the balancer.

I was concerned that something was screwed up when I tried to restart the engine. I unplugged power to the coil pack and cranked. I cranked for a series of intervals which eventually led to the audible slowing of cranking speed, but did not result in an oil pressure indication. I put the battery on the charger for a few hours, came back and tried again. I crank continuously and after what seemed like an eternity, it did build oil pressure. I started it up and the oil pressure was fine. It was actually a bit higher than it had been before the oil change, indicating to me that the filter had been a bit clogged with break in debris and assembly lube. That's why I paid so much for the dern filter! Keep the crap out, yet still flow enough to allow me to run the engine hard without lifting the bypass valve.

Cliff Notes: in the bitter cold after sitting with an empty sump for 3 or more weeks, it can be hard to prime a Northstar.

[This message has been edited by Will (edited 12-21-2010).]

Will FEB 02, 09:42 AM
Not much else going on. I've been working toward getting the car ready for VA inspection, which includes replacing fenders, fender liners and nose so that I can use the correct smooth trim marker light lenses to have all my marker lights work.

I'll also need to build a catalyzed exhaust for it. The current exhaust is dual 2" straight pipes. I'm going to upgrade to 2.5" and install catalysts. I'm in the process of getting the later model dual wall manifolds modified for the task.

After that there are a bunch of little things it needs... quarter windows, dew wipes, steering wheel re-skin, telescoping column conversion and some interesting suspension work.

USFiero FEB 03, 11:08 PM
I just wanted to stop in and say how much I have enjoyed this thread.
Will APR 16, 10:28 PM

quote
Originally posted by USFiero:

I just wanted to stop in and say how much I have enjoyed this thread.



Thanks!
Will APR 16, 10:53 PM
Now have a speedometer... sort of.

Ever since I got it running in November of last year, it hasn't had a speedometer. That is because the transmission has the magnetic reluctor on the diff and the corresponding VSS installed. My harness still had the gear driven VSS electrical connector on it and I didn't have the harness connector for the mag/rel VSS.

I noticed today that the Getrag 284 I have on the shelf had the mag/rel VSS with the correct electrical connector just stuck in it, no wires or pins. Not sure how that happened when I pulled that trans, but there it was.

I installed it into The Mule and drove across the street to get gas. I hit 80 mph in less than a block in 1st gear. This new engine never ceases to impress The gas station across the street is also half a mile away, by the odometer.

Obviously the reluctor wheel has WAY more teeth than the pulses per rev that the gear driven VSS makes. Back in the days of mechanical speedometers, GM geared their speedometer cable drives for 1000 RPM at 60 mph. Since it takes 1 minute to go a mile at 60 mph, this is 1000 revolutions per mile. The gear driver VSS's generated 2 pulses per revolution, so when GM switched from cable driven speedometers to electronic speedometers with gear driven VSS's, the electrical standard became 2000 pulses per mile. At some point this was doubled to 4000 pulses per mile. I'm not sure why.

The FIero electrical system routes the analog VSS signal to the speedometer buffer in the speedometer. This buffer drives the speedometer, as well as cutting the frequency in half and outputting a 5V square wave to the ECM for its road speed knowledge.

The Cadillac (and other modern PCM's until the 58x reluctor came out) route the analog VSS straight to the ECM, which then creates multiple 5V 4000 ppm signals for the speedometer, traction control, overspeed warning module, road sensing suspension, etc.

I reworked my harness to do exactly that and went for a test drive with my amputated Caddy instrument panel plugged in to monitor the PCM data stream. I ran it up to an indicated 2500 RPM in 5th, which should be 55 mph, taking into account the 25% error that's crept into the tach. The Caddy IPC indicated 55, so it's getting the correct vehicle speed. The speedometer did not register. I assume that the 5V output of the ECM isn't enough to trigger the input that's designed for the gear driven VSS.

Any idea how to overcome the voltage mis-match?

I wonder if DFCO and PCM cruise control will work now... maybe the BLM's will even be unlocked? This is the first time this ECM has *EVER* had valid VSS data.

I probably could wire the VSS to *BOTH* the ECM and the speedometer buffer, and build the "standard" Quad 4 speedometer circuit on the Speedo buffer leg of that circuit.
Will MAY 16, 11:26 AM
The car's been having an idle issue for quite a while. It had an idle surge when I was driving it in P'cola so many years ago. It still develops that surge when warm, BUT it also has "ignition drops" in which the tach flickers and the engine nearly stalls. Once warm, it actually does stall about 50% of the time it experiences a drop.

I was getting ready to change out the coil pack as a trial, when last weekend I noticed that the volt meter flickers when the tach does. Low damping analog gauges are good like that. In looking through the manual, the ignition supply circuit and volt meter have limited interaction... I might be losing a fusible link, but I'm OK with that, since it's an opportunity to replace that stupid link with a real fuse.
Will MAY 21, 10:10 PM
Hehehehehehehe....
ALLTRBO MAY 22, 07:26 AM
You're an ass.

See you on Friday.