The New Project: Part Deux!

[njsteve]

Here are those photos I referred to earlier. These were taken in 1993 by a Pontiac fan up in British Columbia who saw the car in a parking lot, ran the VIN through PHS and met the owner.

[njsteve]

And here are the photos he took of the car as it sat in storage from 1995 to 2004, when the motor finally got put back together, shortly before the owner passed away.

He knows the owner of the shop who did the work and will be contacting him in the near future to get some more details on the engine rebuild.

[njsteve]

Bigger version of middle photo:

[njsteve]

Got the engine out today.

Here it is at 9:30 AM



And around 2:00 PM





Got the M22 off and you can see it is engine oil leaking as the front seal is nice and clean.



You can see the oil sling pattern from the rear main seal leakage:

[njsteve]

Gee, one of these things is not like the other: [img]<<GRAEMLIN_URL>>/rolleyes.gif[/img]



I was very careful not to disturb the oily mess back here so I could get a good forensic view of where it's leaking from. Doesn't look like the oil galley plugs were the problem as they were tight and the ripples in the oily mess above and below the plug area are the same.



And here we are at 4:30 PM







That's all for today. Tomorrow I will open her up to see what's inside.

[njsteve]

Tore down the engine this morning. Found some very interesting stuff.

We'll start from the top: Original 7F6 heads with the factory oil deflectors and the cast scallops between the intake runners.

[njsteve]

And the real surprise: domed TRW L2394N pistons. That explains the 230 psi compression test results and the detonation on anything less than racing fuel. So what do we have 10.5 to 1 ratio with the 111cc 7F6 heads?










In googling the part number I found this:

&quot;L2394NF .030 TRW pistons for Pontiac 455, )
.476 dome aluminum forged for high compression.

Unmachined Compression Ratios:
89cc = 12.54:1
96cc = 11.83:1
111cc = 10.25:1
114cc = 9.98:1

These pistons are generally used for racing applications, and may require
machining for proper fit and clearance of smaller chamber heads.&quot;

[njsteve]

And the camshaft looks to be a Crane #283941



And here is the info on that camshaft:

Crane Cams 283941 H-272-2 Hydraulic Flat Tappet Camshaft Pontiac 265-455 V8 55-81 Good low and mid range torque, Good idle, daily usage, towing, performance and fuel efficiency, 2600 - 3000 cruise RPM, 8.75 to 10.5 compression ratio advised.
Part Number: 283941
Grind Number: H-272-2
RPM Power Range: 1800-5400
Duration Intake @.050&quot;: 216
Duration Exhaust @.050&quot;: 228
Advertised Duration Intake : 272
Advertised Duration Exhaust: 284
Lobe Separation: 112
Valve Lash Intake: 0
Valve Lash Exhaust: 0
Gross Valve Lift Intake: 0.454
Gross Valve Lift Exhaust: 0.48

[njsteve]

Looks like some aftermarket forged, pressed pin, connecting rods. Do these look familiar to anyone?

[njsteve]

The crank is std on both the rods and the mains.





The wear on the rod bearings looks like detonation was taking its toll.