Anyone know anything about this 964 RS racecar?
#137
The car made 312hp, 273lb/ft at the wheels on a Mustang dyno which usually show about 10% less than a dynojet. This gives an estimated 375hp at the flywheel. I'm pretty ecstatic. I'll get some video and a plot posted this week.
Big props to Cody Forbes at Black Forest Racing in Denver, NC for helping me resurrect this patient. I plan on having it at the PCA Zone 2 DE at VIR in March. Hope to see some others there.
Big props to Cody Forbes at Black Forest Racing in Denver, NC for helping me resurrect this patient. I plan on having it at the PCA Zone 2 DE at VIR in March. Hope to see some others there.
#138
Weather cooperating, the car will have its first outing tomorrow at CMP driven by Cody Forbes of Black Forest Racing. I can't say enough good things about him, he has been AWESOME to work with and he's a nice guy on top of it! It's supposed to be fairly cold but I hope the shakedown goes off without any major events.
If everything checks out, I'll be taking the Car to the PCA Zone 2 DE @VIR March 13-15. Stop by and say hi if you're going!
If everything checks out, I'll be taking the Car to the PCA Zone 2 DE @VIR March 13-15. Stop by and say hi if you're going!
#140
I was talking to Cody last night, and had some bad news. While performing a final oil change before taking the car to CMP today, he found this:
Yes, more bits of metal that definitely shouldn't be there.
We had guessed earlier in this saga that the metal that was initially found looked like a timing gear tooth. I removed the chain covers and thoroughly inspected everything, and there was no damage. None.
Well, this looks like a timing gear pin that has been mangled. Hard to explain why the timing gear system looks good but there is what appears to be a mechanically rearranged pin in the sump. Soooo very disappointing but there is probably nothing smart left to do but tear things apart and make sure nothing is wrong on the inside. It's the only intelligent thing to do.
#141
SO SORRY, Preston. After all you've done with the old girl.
FWIW, I keep my ABS switched off. It gets in the way.
(Should you find you want, or need, ABS - I'm yanking my entire system soon)
FWIW, I keep my ABS switched off. It gets in the way.
(Should you find you want, or need, ABS - I'm yanking my entire system soon)
#142
It's OK, I knew this was a long journey.
We'll live with ABS off for awhile, then if we want it we will consider Teves or Bosch motorsport systems. I know the 964 ABS kind of sucked anyway. Not sure what the differences were for the RSR version, but it is definitely still 3 channel.
We'll live with ABS off for awhile, then if we want it we will consider Teves or Bosch motorsport systems. I know the 964 ABS kind of sucked anyway. Not sure what the differences were for the RSR version, but it is definitely still 3 channel.
#144
Valve train and cams disassembled, looking good besides some not awesome valve adjustments. What doesn't look so hot is the right side cam sprocket. It has machined itself down a LOT. Here's a picture of mine (left) and another one from another motor with 100k on it. It looks fresh by comparison.
Determined cause: cam sprocket and intermediate shaft sprocket not aligned properly in the same plane during previous engine assembly. Good this was found now, as losing a tooth would definitely be catastrophic.
Determined cause: cam sprocket and intermediate shaft sprocket not aligned properly in the same plane during previous engine assembly. Good this was found now, as losing a tooth would definitely be catastrophic.
#146
So the one thing we are wondering about for reassembly is what is the deal with the flame rings / head gaskets on the heads. Here are some pictures:
These aren't stock. From what I've been told stock ones sit in / fill two grooves: one on the head side, and one on the cylinder side. These are different; they fit into the head groove, but the cylinder side is flat. Any idea who makes them?
These aren't stock. From what I've been told stock ones sit in / fill two grooves: one on the head side, and one on the cylinder side. These are different; they fit into the head groove, but the cylinder side is flat. Any idea who makes them?
Last edited by preston_brown; 03-06-2015 at 09:55 PM.
#147
Of course the real $10,000 question is why there was an extra timing pin / dowel bouncing around inside the case? We will never know, but I wouldn't be surprised if it got dropped into the case by someone during the previous rebuild, and they either (a) didn't see it happen, or (b) made a mental note to fish it out later but never did and forgot about it. Whatever the case, damage was done.
Looks like we got away with a completely trashed intermediate shaft (well, the shaft is fine but the sprockets and gears aren't, and you can't buy the gear separate from the shaft); right side chain and sprocket; and bearings. Will have a final report today and then I need to try to source parts ASAP, I have plans for this car!
Looks like we got away with a completely trashed intermediate shaft (well, the shaft is fine but the sprockets and gears aren't, and you can't buy the gear separate from the shaft); right side chain and sprocket; and bearings. Will have a final report today and then I need to try to source parts ASAP, I have plans for this car!
#148
More damage. For some reason 3 valves have mushroomed a bit at the stem end, and the rocker feet are also slightly damaged. What might cause this? Loose valve adjustment that went unfixed for too long?
Mushroomed valve stem
Normal valve stem
Mushroomed valve stem
Normal valve stem
Last edited by preston_brown; 03-08-2015 at 10:43 AM.
#149
While the engine is apart, we are taking the time to clean, measure and check everything. If we can source new valves in time, it may still be possible to make it to VIR next weekend.
Case halves ultrasonically cleaned
More parts cleaned up
Making everything as clean as possible
My engine tin is in pretty sorry shape. If we can't make VIR we are going to get it powdercoated. Otherwise it will still get a slight makeover, even if the paint comes out of a rattle can.
Case halves ultrasonically cleaned
More parts cleaned up
Making everything as clean as possible
My engine tin is in pretty sorry shape. If we can't make VIR we are going to get it powdercoated. Otherwise it will still get a slight makeover, even if the paint comes out of a rattle can.
#150
Looks like you caught what could have been a major failure before it happened. I hope you can get it back together in time for Zone 2 at VIR. Looking forward to seeing the car back on the track.