Jump to content

Home Built by Jeff

Home Built Z 'Full video build'

Recommended Posts

5 hours ago, Home Built by Jeff said:

It has just done it again. No idea why as there is only one link?

Ya, not sure why it's posting the videos three times.  Just copy-paste the single link and it should work only once.  Maybe it's a bug, who knows.  Just keep posting the videos and I can fix it...  no need to worry about it.

  • Like 2

Share this post


Link to post
Share on other sites

Jeff, I guess your boss will have to ride shotgun and do all the roadside work... or you can trade for one of these cars as serviced on the road by the JAF :)

http://www.jaf.or.jp/e/road_s_info.htm

 

rservice.png

 

Seriously though,  you can probably relocate the stay/prop to the other side ... you certainly have the skills!

Share this post


Link to post
Share on other sites

It has been brought to my attention, that it is more than likely to get the driver out of traffic, when opening it on the side of the road. Also the fact that I need to track down the torsion bars for the bonnet and then it should stay up with out the stat anyway ;) 

Share this post


Link to post
Share on other sites
This week I get stuck in to do the final alignment of all the panels and start the body filler. It is a slow process, but if I want it done right I need to take my time and keep plugging away at it.
 
 
 
Edited by Home Built by Jeff
  • Like 1

Share this post


Link to post
Share on other sites
This week I learned a lot more about engine rebuilding and I lapped the valves. I then needed to work out my engines compression which meant CC'ing the combustion chambers.
 
 
Edited by Home Built by Jeff

Share this post


Link to post
Share on other sites

You might want to tinker with one of the datsun engine calculators. Your ratio is pretty low but I don't know what your local fuel is like. I know alot of guys build closer to 10:1 with the right cam

Share this post


Link to post
Share on other sites

Good stuff!

 

Attached is a tool for engine planning. Below is your basic config entered. The 53.6cc chamber volume can be edited to 53.5 to match yours. 

As mentioned above, a good 0.080" shave (cc's at 46) will bring up the compression to ~ 9.7 which these engines seem to enjoy.

 

 

image.png

S30 Engine Modeller V3 Beta 3.zip

Share this post


Link to post
Share on other sites

I shaved 1mm off the head and I actually stuffed up the calculation, as I didn't add the combustion chamber volume to the swept volume, so it is more like 9.57:1.

459 + 53.5 = 512.5

512.5 / 53.5 = 9.57

 

Share this post


Link to post
Share on other sites
2 hours ago, Home Built by Jeff said:

I shaved 1mm off the head and I actually stuffed up the calculation, as I didn't add the combustion chamber volume to the swept volume, so it is more like 9.57:1.

459 + 53.5 = 512.5

512.5 / 53.5 = 9.57

 

Getting better but you also need to factor HG volume which brings it down to 8.6:1 ratio.

 

Another important factor is "squish". Which is how close the flat piston top comes to the flat chamber bottom.  For your set up it will be ~ 1.1mm space.  Ideally it should be less than 0.7mm but how close you bring them is balancing return with risk.

 

You can bring the two closer and up the compression by offset grinding the crank to fit 1mm larger rod bearings or you can shave the top of the block 0.5mm.

 

btw the 53.5cc volume you measured is very close to stock value.  You can shave more off the head to bring up the compression.

Edited by 240260280

Share this post


Link to post
Share on other sites

Absolutely, but I really don't want to go crazy with it. I am only looking at giving this engine a quick freshen up, not going to town, otherwise I would have replaced the valves, recut the seats, and done a lot more porting.

Share this post


Link to post
Share on other sites
This week I have got myself some extra valves to replace the dodgy ones I had previously, so I get them lapped to fit and then move on to more body work.   [/url]  



Hey Jeff,

Been watching your videos for awhile now. Not sure if it’s already been mentioned about your cylinder head seats. I found out the seats are bronze and soft which would get pitting and damaged since there’s no lead in fuel nowadays. Have you gotten your valve seats changed to account for unleaded fuel now?


Sent from my iPhone using Classic Zcar Club mobile

Share this post


Link to post
Share on other sites

No, I am just giving this a light freshen up. I am not going to town. That said, the seats all look to be in pretty good condition. There is definitely no pitting in them, and they actually seem quite hard compared to the valves when I was doing the lapping. The valves would wear much quicker than the seats with the lapping paste. I know I should get the seats re-cut and then lap the valves to match, but I have checked the seal on them with bearing blue and they all seat well so I am happy.

Share this post


Link to post
Share on other sites

Wow Jeff! Way ahead of mine build. Granted I took a couple years off from losing my daughter. But also I’m teaching myself how to weld and do other things since it’s the first time I’m doing this. I’m learning a lot from watching your videos.


Sent from my iPhone using Classic Zcar Club mobile

Share this post


Link to post
Share on other sites
48 minutes ago, Perfect240Z said:

Wow Jeff! Way ahead of mine build. Granted I took a couple years off from losing my daughter. But also I’m teaching myself how to weld and do other things since it’s the first time I’m doing this. I’m learning a lot from watching your videos.


Sent from my iPhone using Classic Zcar Club mobile

Sorry for your loss. I find it theraputic putting mine back together, besides  it takes my mind off what the future may hold for my 2. Hold them close!

20170809_073331.jpg

  • Like 3

Share this post


Link to post
Share on other sites
2 hours ago, Perfect240Z said:

Wow Jeff! Way ahead of mine build. Granted I took a couple years off from losing my daughter. But also I’m teaching myself how to weld and do other things since it’s the first time I’m doing this. I’m learning a lot from watching your videos.


Sent from my iPhone using Classic Zcar Club mobile

Thanks mate. Sorry for your loss, but as esmit says, building a project is a great distraction.  

I basically taught myself along the way, and I love learning new skills. That is the great thing about YouTube. Whenever i have the next thing to tackle and I have never done it before, I just watch a few videos and give it a go. I think most people have no idea of what they are capable of if the just put their mond to it. 

  • Like 1

Share this post


Link to post
Share on other sites
Sorry for your loss. I find it theraputic putting mine back together, besides  it takes my mind off what the future may hold for my 2. Hold them close!
20170809_073331.thumb.jpg.97c41c280349a8356b1defa319239467.jpg

Thanks, I have since had 2 boys. So I have solely focused on them since I feel like I shouldn’t give up anytime away from them. I have started slowly back in on the Z, plus I acquired another one that just needs some maintenance to be road worthy. I think they each can have one now at least.


Sent from my iPhone using Classic Zcar Club mobile

Share this post


Link to post
Share on other sites
Thanks mate. Sorry for your loss, but as esmit says, building a project is a great distraction.  
I basically taught myself along the way, and I love learning new skills. That is the great thing about YouTube. Whenever i have the next thing to tackle and I have never done it before, I just watch a few videos and give it a go. I think most people have no idea of what they are capable of if the just put their mond to it. 

Thanks Jeff, yep it is but it was hard also on my wife so I couldn’t leave her side. But since I now have two little boys and I have gotten a second Z that I could drive. The project is back on, just slow to getting back into it.24B37062-4EE2-49CD-ADDC-10EDB2A64781.jpg


Sent from my iPhone using Classic Zcar Club mobile
  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.