 Connecting rod to camshaft clearance |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| keske968 |
 Oct 3 2012, 06:37 AM
Post
#1
|
|
Member  Group: Members Posts: 132 Joined: 5-September 06 From: Papillion, Ne Member No.: 6,778 Region Association: None  |
I am building my own engine and have a question that I can not find the answer to on the searches that I have done. When putting in a stroker crankshaft one of the connecting rods comes very close to hitting a camshaft lobe. What is the recommended clearance between these two parts? I know that they will expand slightly when the engine warms up and currently we only have .006" between them. I am concerned that this is not enough clearance.
Thanks for all the help you guys provide. |
   |
 
|
| two-strokejohn |
Oct 3 2012, 07:49 AM
Post
#2
|
|
Member Group: Members Posts: 81 Joined: 30-March 06 From: Orient, Ohio Member No.: 5,793 Region Association: North East States |
http://www.ephotomotion.com/914engine/index.htm
check out this web site . I think it is covered there.......... good reading on a rebuild. |
|
|
|
| ChrisFoley |
Oct 3 2012, 09:19 AM
Post
#3
|
|
I am Tangerine Racing Group: Members Posts: 7,923 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None 
|
I don't allow less than .030".
|
 |
|
| keske968 |
Oct 3 2012, 09:40 AM
Post
#4
|
|
Member Group: Members Posts: 132 Joined: 5-September 06 From: Papillion, Ne Member No.: 6,778 Region Association: None |
QUOTE(two-strokejohn @ Oct 3 2012, 08:49 AM)  http://www.ephotomotion.com/914engine/index.htm check out this web site . I think it is covered there.......... good reading on a rebuild. I have used his site extensively (great resource) and it looks like he only allows for .008" clearance. I was not sure that was enough to cover the thermal expansion. |
|
|
|
| ChrisFoley |
Oct 3 2012, 10:16 AM
Post
#5
|
|
I am Tangerine Racing Group: Members Posts: 7,923 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
|
I'm more concerned with crank flex than thermal expansion.
The case is certain to grow more than the camshaft or crankshaft/rods, which would move them further apart. |
|
|
|
| Mark Henry |
Oct 3 2012, 11:57 AM
Post
#6
|
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(Racer Chris @ Oct 3 2012, 11:19 AM) I don't allow less than .030". (IMG:style_emoticons/default/agree.gif) Web cams for "larger displacement engines" have a reduced base circle thus helping with rod clearance, after that you have to start removing material from the rod itself. |
|
|
|
| JoeSharp |
Oct 3 2012, 08:41 PM
Post
#7
|
|
In Irvine, Ca. May 15-18 Group: Members Posts: 3,947 Joined: 9-July 03 From: DeLand, Florida Member No.: 898 Region Association: South East States |
Had a motor that had a shinny spot on a cam lobe and never heard a thing from it. It was being touched by a rod nut.
|
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th May 2024 - 08:41 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.