Forum
Log In
Register
Home
Topic RSS
2:04 PM
May 25, 2010
Offline
Hi, i am currently working on a small 2-cycle deisel engine that was designed by L.H. Sparey back in the 40's. i cast the crankcase in aluminum in my "foundry". a small propane fired crucible furnace i got from a friend, this is where part of the trouble is. when i cast it i made the pattern to size, forgetting about shrinkage, so as a result the crankcase is about .01" smaller inside. i didnt think this would matter much, and i still think that. now other than honing the cylinder and piston to size, and making a cylinder cover, i only have to cut the ports in to the cylinder. Now here is the trouble, because of the smaller crankcase, i accordingly made the crankshaft throw smaller, thus the ports have to be shifted. i think the intake and transfer will only move a little bit, but on the drawings there is no indication as to where to cut the two exhaust ports! 
I wonder if any one would know how many degrees past TDC or BDC intake, transfer, and exhaust is on a 2-cycle deisel engine?
(sorry there are no scans of the drawings, but the scanner is in a mood!)
2:21 PM
January 9, 2009
Offline
Is it this engine? As soon as you mentioned Sparey I remembered seeing it in his book "The Amateur's Lathe". Unfortunately, the book doesn't describe the construction of this little engine, it only shows the picture I've provided below.
- REMEMBER: You need to subscribe to your posts so that you'll receive an e-mail update when a member replies.
- If you are having trouble posting pictures, be sure to visit the FAQ section of the forum for instructions.
- If you are having trouble viewing the forum posts, consider trying a different browser like Firefox or Chrome.
2:31 PM
January 9, 2009
Offline
A guy wrote about his build of this little engine back in 2003. His writeup can be found here. Do any of his pictures/descriptions help?
- REMEMBER: You need to subscribe to your posts so that you'll receive an e-mail update when a member replies.
- If you are having trouble posting pictures, be sure to visit the FAQ section of the forum for instructions.
- If you are having trouble viewing the forum posts, consider trying a different browser like Firefox or Chrome.
2:32 PM
May 25, 2010
Offline
Yup, thats the one! I am going to try and get some pictures of the guts and little bits i have made for so far!
2:40 PM
January 9, 2009
Offline
Pictures would be great. Be sure to read the FAQ so you'll know how to post pictures (it's not as intuitive as it should be). And remeber to choose "baseline" instead of "left" for the picture's alignment, otherwise the words wrap around the images and make everything look terrible (I'm working on a fix for this, but for now using "baseline" is the only way to fix it).
- REMEMBER: You need to subscribe to your posts so that you'll receive an e-mail update when a member replies.
- If you are having trouble posting pictures, be sure to visit the FAQ section of the forum for instructions.
- If you are having trouble viewing the forum posts, consider trying a different browser like Firefox or Chrome.
2:10 PM
May 25, 2010
Offline
here are some pictures of the insides of the engine.
2:34 PM
January 9, 2009
Offline
Hi Nick
I resized the pics for you and deleted the extra posts. In the future if you have issues with the size of a picture you can edit your post by clicking on "Edit Your Post", then click the image that you want to resize (to select it), and then on the image icon to bring up the image properties (where you can change the alignment from Left to Baseline, the size from huge to 500px wide, etc).
It's a bummer that this forum software has bugs when it comes to posting pictures, but the developers are working hard to get them worked out.
Now, about the pictures. The parts look great! This project would definitely fit in the "Advanced" category. Were you able to get any information off of the site I linked to?
- REMEMBER: You need to subscribe to your posts so that you'll receive an e-mail update when a member replies.
- If you are having trouble posting pictures, be sure to visit the FAQ section of the forum for instructions.
- If you are having trouble viewing the forum posts, consider trying a different browser like Firefox or Chrome.
3:01 PM
May 25, 2010
Offline
Thank you! I'll keep that i mind next time i post a picture! Thank you, also for saying that the parts would fit in the "advanced" category. I am 17 and have only been doing lathe work for about 2 years now, my brother just bought a mill at a garage sale, so I am learning how to run a mill as well! As to the website, i figured out how to hold the cooling cap to mill the fins in on the top ( i noticed he used brass for the carburettor tube as well!)
2:21 PM
May 25, 2010
Offline
if any one is interested, here is a picture of my foundry. it is fired with a propane atmospheric burner. i welded together a small crucible ( it holds about 4 pounds of aluminum), but i also have a clay-graphite crucible for brass and bronze although i have not melted anything in that one yet. :-)
Most Users Ever Online: 60
Currently Online:
12 Guest(s)
Currently Browsing this Page:
1 Guest(s)
Top Posters:
norman: 466
ironring1: 429
GarethBell: 384
Alexander m: 338
Titaniumboy: 322
blame: 290
Member Stats:
Guest Posters: 2
Members: 11902
Moderators: 3
Admins: 1
Forum Stats:
Groups: 5
Forums: 18
Topics: 1089
Posts: 9263
Newest Members: pfinlay@joeys.org, dipstick, digitalis49, Pete59, relte, Rangertrek
Moderators: snigit (1), madreptillian (93), Jerry (560)
Administrators: Tyler (1516)
Usage Policy
