| ausmini https://www.ausmini.com/forums/ |
|
| Valve Seats and Valve - Large Pics for detail https://www.ausmini.com/forums/viewtopic.php?f=2&t=74789 |
Page 1 of 1 |
| Author: | GR [ Fri Dec 30, 2011 11:38 am ] |
| Post subject: | Valve Seats and Valve - Large Pics for detail |
Here are photos of my valve and valve seats. Showing that even thought the valve seat is below the surface of the chamber, it is by no means shrouded. 
Here is a genuine Mk1 Cooper S Inlet Valve showing the seat they designed back in the early 60's, what I believe is the best flowing valve in a mini today. 
Graham Russell PS Thanks Mr Typer photo man 
|
|
| Author: | sitnlo62 [ Sat Dec 31, 2011 12:14 am ] |
| Post subject: | |
GR, Great PicsThanks for posting. A lot of good info in those shots 
Dave |
|
| Author: | dodge [ Sat Dec 31, 2011 7:06 am ] |
| Post subject: | |
pin holes in the seats? |
|
| Author: | TheMiniMan [ Sat Dec 31, 2011 9:16 am ] |
| Post subject: | |
he uses pretty tough pins 
just typical of the castings of the time & the quality of the camera used to take the pics we`re using a CNC seat cutter these days,,, plug in the program with the profile that you want & hit the "Go" button i know it`s cheating but i`m over cutting seats for a living these days:-)
|
|
| Author: | drmini in aust [ Sat Dec 31, 2011 9:45 am ] |
| Post subject: | |
Graham has a `Sunnen' machine for machining the head for valve seat inserts, he also uses it to machine these seat profiles dead true to the valve guides. |
|
| Author: | 1098 [ Sat Dec 31, 2011 6:55 pm ] |
| Post subject: | |
I thought it was always good practice to have the seat level with the chamber face? Surely by 'sinking' it creates an interrupted flow and therefore diminished flow figures? |
|
| Author: | MG Rocket [ Sat Dec 31, 2011 10:08 pm ] |
| Post subject: | |
1098 wrote: I thought it was always good practice to have the seat level with the chamber face?
Surely by 'sinking' it creates an interrupted flow and therefore diminished flow figures? Mention was made of this and GR explains why he does it this way. http://www.ausmini.com/forums/viewtopic ... c&start=45 |
|
| Author: | GR [ Sun Jan 01, 2012 2:23 pm ] |
| Post subject: | |
Hi 1098 To answer your question yes it does alter the flow by making it better, by altering the top cut to different angles you can improve the flow but you may have to alter the angel before and after the 45 seat then you may have to alter the back of the valve to match the new seat then go to the dyno to see if it all works. THATS WHY WE USE A FLOWBENCH. Now the area before and after the valve about .500 each side is the most important part of the intake track, this is about 30 to 35% of your total flow, a good petrol burning engine will use about 1.67 cubic feet of air to make 1HP so you can see every little bit you can pick up here will make a difference to the out come. Now the NASCAR head boys use 55deg seats as these flow more the a 45 seat the down side to this is very rapid wear rate, but it only has to last 500 miles and they change the whole top end. Graham Russell |
|
| Page 1 of 1 | All times are UTC + 10 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|