IndigoBlueCooperS wrote:
GT, thanks for the info.
You're welcome. Have fun with your project
| ausmini https://www.ausmini.com/forums/ |
|
| Crank shaft wear https://www.ausmini.com/forums/viewtopic.php?f=2&t=81304 |
Page 1 of 1 |
| Author: | IndigoBlueCooperS [ Tue Apr 30, 2013 9:41 pm ] |
| Post subject: | Crank shaft wear |
What is the allowable undersize on the crankshaft? I have a late A+ 1275 crank, and the bigends come in at just on 1.7500 - no less. May be ½ thou oval but that would be all if that. The book states between 1.7504 and 1.7509. Will standard bearings do the job? The mains are on spec. |
|
| Author: | GT mowog [ Wed May 01, 2013 6:38 am ] |
| Post subject: | |
Just to check, which Workshop Manual are you working from? A+ is NOT the same as A! This seems to be a reason why peoples say A+ Cranks, Block and Bearings (like the plain lower slipper in the Mains) are no good. They are very good, when used correctly! The Factory A+ Workshop Manual shows the Crankpin Diameter (Big Ends) at 1.7497" to 1.7504" Mains are also different - 2.0011" to 2.0017" With 0.0005" Ovality, if it were me, I'd have it re-ground. |
|
| Author: | IndigoBlueCooperS [ Wed May 01, 2013 8:32 pm ] |
| Post subject: | |
GT, thanks for the info. So my crank appears to be in spec, even though it is up to 1/2 out of round. |
|
| Author: | drmini in aust [ Wed May 01, 2013 8:38 pm ] |
| Post subject: | |
Take it to a crank grinder shop, they can probably linish that 1/2 a thou ovality out if there's no scoring. Pity to take a whole .010" off it with a regrind. [edit] typo |
|
| Author: | wobbles_55 [ Wed May 01, 2013 10:46 pm ] |
| Post subject: | crank |
Hi Dave, Take it to Jim @ Crankshaft Grinding Specialists behind Chris Miltons at Prospect.. Good bloke and does a top job and he is tainted by the A-series brush as well on the Sprite side of things. He has just done my new crank for the race car after my EN40 wizz bank crank was cracked.. and yesterday he crack tested and linished the crank in Beanies motor as well. Rob F |
|
| Author: | IndigoBlueCooperS [ Thu May 02, 2013 6:06 pm ] |
| Post subject: | |
Guys, thanks for the comments, will get it checked out. |
|
| Author: | GT mowog [ Thu May 09, 2013 7:19 pm ] |
| Post subject: | |
IndigoBlueCooperS wrote: GT, thanks for the info.
You're welcome. Have fun with your project
|
|
| Page 1 of 1 | All times are UTC + 10 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|