911SC Track Car Build - Episode 2: Engine Rebuild Preparation
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- เผยแพร่เมื่อ 13 ก.ย. 2024
- This is the second video in a series that documents how I built up a 1983 Porsche 911SC track car to compete in the One Lap of America race. This episode covers preparing the engine for assembly. I describe acquiring and calibrating some important tools you need, assessing parts after they return from the machine shop, and cleaning and prepping the parts before assembly.
Here are links to the resources I mention in the video:
Circle Performance engine machining shop: www.circleperf...
CP pistons: www.cp-carrill...
William Knight Racing: forums.pelicanp...
Wayne Dempsey's book How to Rebuild and Modify Porsche 911 Engines: amzn.to/3Aup5Ov (paid link)
Web Cam grind 464/465: www.webcamshaft...
Thread chaser set: www.nationalto...
Parts washer: www.harborfrei...
Mineral spirits:
www.homedepot....
I am sadly surprised at the error rate you discovered on the torque wrenches. Several months ago I used a torque wrench to mount new brake calipers and was bewildered when I cross threading the screws. It all makes a bit more sense now.
I really enjoy the style of your videos and look forward to more.
I'm sorry about the cross-threaded bolt. Hopefully there are still enough good threads to hold the torque. Good torque wrenches can be re-tuned. Some of mine were lower-cost versions that are unfortunately out of whack and cannot be retuned. Someday I will invest in some better ones, but for now knowing the error enables me to apply close to the right torque.
Absolutely love the science thanks so much. Things make so much more sense
Thanks! There is a lot more to come.
learning alot about these cars, thanks for educating us more man
Glad you like them!
Love the physics explanation. You should keep making videos like this!
There are many more to come!!! I have all the footage already. I am just in the process of editing.
Changing an engine compression is not an easy thing you have to change a lot of things in the engine..
Good stuff. I like your tone, vocabulary, and how you reference where and what you purchased.
I'm a teacher, so I drive a 996, but I'll have my master's soon enough, so a 911SC is in my future.
You have great taste! If you do get a 911SC, I suggest hopping it up. They aren't that fast stock. Thanks for watching!
Whoa! Is that a Unimog in the background? It would be fun to see you give a tour of that engineering marvel and tell us how you found one in the USA. Thank you.
Yes, I have a 1975 Unimog 406. It is a fun truck, like a life size Tonka toy. I use it to plow my driveway. Thanks for the suggestion. I am thinking about doing a series of videos where I talk about our other cars and show some maintenance on them.
Brilliant video, whens the next episode?? 👏
It's up!
Great episode. Torque wrench calibration exercise (approximation) was very interesting. Would be interesting to see how the calibration shops do it.
In principle, I suspect they would do it the same way. Apply a known load and see how that corresponds to the load that the torque wrench reads. However, they would use more accurate loads and measurements than I did. They would also change the wrench calibration to match indicated load to applied load. My Snap-On wrench can be calibrated, but my Craftsman ones cannot. That's why I calculated load error. So if I needed 10 Nm, and I knew the wrench applied 10% over indicated, I would set the wrench to 9 Nm to get the correct applied load.
Thanks for the follow up - appreciate your insights and self calibration DIY tips. I have an SC as well (‘83) that I work on - mainly to maintain and replace old worn parts. Great German engineering those machines.
I’ve done kinda similar rebuild last year. I can feel many thoughts you had 😂 keep going, it will be awesome when finished !
Thanks for the note! I actually have finished and raced the car in One Lap of America last year. What I am doing now is catching up on video editing. Please stay tuned to see the entire journey!
Interesting! How do you know your bathroom scale is calibrated? Should weigh a known volume of water.
Hi Amos, I just stumbled upon your channel last night, in part thanks to the YT algo. Thank you for all the in-depth insights you provide with your rebuild videos, I am learning a lot. Unsure that I will ever rebuild my 993 engine myself, but there’s still plenty to learn and understand about the internals of the air-cooled Porsche engines. Are you planning on shooting any 964 tutorials?
It's really funny you are asking this right now. I have my 964 up on a lift at the moment to inspect a few oil leaks. What was a few drips has gotten worse and is now getting too much oil on the exhaust heat exchangers. I think I have tracked the issue to leaks from the power steering seal, the rear crankshaft seal, and low-quality rocker cover seals. I will fix all those this winter. I will likely film the project. Your comment is good motivation to do so!
Love the way you tested the torque wrenches, I thought of doing something very similar several years ago but figured I was missing something important because it seemed too simple. To make that cam come alive, looking forward to your explanation on tuning the exhaust header length. Big hint, most off the shelf headers compromise too much for ease of fitment.
Thanks! What made me confident in my torque wrench measurements is that the slope stayed constant even when I changed load sources. I used SSI headers and am really happy with them! I did go with a Dansk RSR muffler because it minimized power loss. Sounds great too! Thanks for watching!
Good stuff, patiently awaiting more videos. This is really close to the same set up I'll be running in my '79 SC (9.5 JEs, Mod S from Webcam, 40mm PMOs, EDIS Wasted Spark). What size carbs did you go with?
I am running 46mm carbs with a 40mm venturi. William Knight recommended this setup. A big part of the power I am making is using using the Dansk RSR muffler - there is very little restriction. I am making 260 hp at the crank. Good luck!
When is the next vid?
Coming soon! I have been pushing hard to prepare the car for the One Lap of America race. I will try to get the next video out in the next week or so. Stay tuned!
you should be a teacher!
and i'm a dummy. just watched the previous video and turns out you are a teacher! huge thank you for putting this series together. would love to do this some day!
Yup, I am a teaching in my day job :)