Zed Head

It would be easier and more effective probably to just buy a 3.9 R200 with good gears. I don't think I have ever seen anyone talk about worn gears on their R200. But here are the part numbers if you want to try to track new gears down. http://www.carpartsmanual.com/datsun/Z-1969-1978/power-train/differential-gear/r200/13

280Z https://bringatrailer.com/listing/1975-datsun-280z-34/

Too bad the 280Z's don't generate the same excitement. Seems like the 240Z's are becoming collector things, like Pokemon cards. The value is in the scarcity. The value could disappear overnight once a new thing comes along. No offense intended, just a thought. https://cardcollector.co.uk/collecting-pokemon-cards/

I'm not trying to cause trouble. Just talking about an interesting car. Your build thread is too long to search through to find the explanation. It really stands out in the pictures.

This is for AC hoses? Looks like a great job on the car. Good luck.

Isn't it really a resto mod? Resto perfecto maybe. Parts have been replaced with better parts, but they are not original, therefore not resto. Just pretending I'm a car show judge. Anybody know what this thing is...

Looks like the silver foil from the top of a gallon jug of oil. ? If it is a bearing failing you will hear it eventually. Measuring cylinder pressures, examining cam lobes, checking timing chain wear...those are the typical things you'd do to determine engine wear. 136,000 miles is not a huge number for these engines.

What engine? How many miles? What do you know about it? Can you post a picture of the copper flakes? Might just be from the washer on the drain plug.

Is this yours Cliff/site @siteunseen ? I see orange. Condolences if it is. It's been Californicated. https://bringatrailer.com/listing/1971-datsun-240z-210/ "This 1971 Datsun 240Z was acquired by the seller four years ago while in Alabama, and was subsequently repainted in metallic green."

Might this be part of it? Sorry.... https://www.theguardian.com/sport/2022/jan/11/georgia-alabama-national-championship-game

All of the 5 speeds through 1983 are called FS5W71B. The label doesn't tell everything about what's inside.

You can buy this length in coated professionally prefitted tube at your local auto parts store. Run a piece of string or wire over the orginal to get the length. Bend the new one to match the shape. I might have mentioned this already.

Your antifreeze should contain corrosion-inhibiting chemicals. The block itself will rust if you don't use proper antifreeze, it's cast iron.

You might be thinking of stamped steel versus cast iron. I've never seen an aluminum impeller. Compare the AISIN and Airtex pictures to the others. I think that most people like the cast impellers. They were hard to find for a few years but it looks like they're back. https://www.rockauto.com/en/catalog/nissan,1978,280z,2.8l+l6,1209260,cooling+system,water+pump,2208

Can you describe the material and the process used to make it? It looks interesting. I made a time stamp of the video that shows the broken bearing holder. for the impatient people. Good luck, think about doing the 280Z distributors. They have the same problem. Even the points distributors. 240Z repro parts might be a good market.

Definitely some odd stuff to think about.

Seems obvious that it got crunched in the front, just by the pictures. The seller is not the owner, it's a sales shop. The guy has to know but he can claim he does not. His "techs" did the work, not him. Plausible deniability. It got to $20,550 but RNM. Does Nissan paint do this, even on a 71? The roof should look the same. It's been crunched and repaired.

Tandy Radio Shack?

Branch from a separate thread...

Anybody know SuperDan? Looks like he did not renew his website certificate. Whatever that means.

Eudora.

So you're saying that without the fans it overheats, with the fans it reaches thermostat temperature. Doesn't that mean you should put a 180 thermostat back in and leave the fans on? Do you still have the radiator shroud installed? No offense, but the factory setup should work just fine with your engine. The situation seems overly complicated. Things aren't making sense.

Are you using a thermostat? Sounds like you either don't have a thermostat or it's stuck open.

Pressures can vary depending on the gauge and adapters that are used but those numbers are kind of low. They're about right for a turbo engine. I can't find much about the 260Z E88. I've read about "smog" E88's that have lower CR's. The 240Z E88's had pretty small combustion chambers. Anyway, here's an article with some math and comments about what you could expect. https://www.motortrend.com/how-to/compression-ratio-means-more-power/ Also, the 260Z had a CR of 8.8:1, which is actually on the high end for Z engines. But you have a larger displacement so even with flat-tops you'll end up lower than that. (edited) Big picture - it runs well and makes good power, why mess with it for small gains?

Have you measured cylinder pressures? That will tell you something about the CR. Ideally, combustion chamber volume would have been measured when the port-matching and valve unshrouding was done. Either way, if you did not install bigger valves, an N42 or N47 will be an immediate benefit, due to the higher flow. 2mm bigger intake valve and smaller combustion chambers. Here's the 1974 260Z specs compared to 1976 280Z. Even the text is cleaner and crisper.