MadMike
1600dp
Posts: 3,277
Joined: Oct 30, 2008 10:21:12 GMT -5
|
Post by MadMike on Feb 11, 2015 8:52:39 GMT -5
from my supercross days,drill piston for oil/lube=no scuffing kind of an easy way to balance too   |
|
clintonddk
1600dp
Posts: 755
Joined: Oct 7, 2008 18:16:45 GMT -5
|
old trick
Feb 11, 2015 13:51:51 GMT -5
via mobile
Post by clintonddk on Feb 11, 2015 13:51:51 GMT -5
I've heard of dimpling but never drilling. Neat!
|
|
MadMike
1600dp
Posts: 3,277
Joined: Oct 30, 2008 10:21:12 GMT -5
|
Post by MadMike on Feb 12, 2015 7:57:53 GMT -5
Thanks |
|
vanapplebomb
1600dp
Posts: 869 
Joined: Jan 22, 2013 23:36:55 GMT -5
|
Post by vanapplebomb on Feb 15, 2015 22:42:02 GMT -5
Just allows more oil to flow between the skirt and cylinder walls??
|
|
MadMike
1600dp
Posts: 3,277
Joined: Oct 30, 2008 10:21:12 GMT -5
|
Post by MadMike on Feb 16, 2015 7:47:17 GMT -5
Yepper,simple way to balance too
|
|
vw1s
1600dp
I am Jack's Medulla Oblongata...
Posts: 1,841
Joined: Jun 25, 2008 5:16:14 GMT -5
|
old trick
Feb 16, 2015 9:36:30 GMT -5
via mobile
Post by vw1s on Feb 16, 2015 9:36:30 GMT -5
But, doesn't gravity work against you here? Wouldn't the oil on the top tend to drain back through the holes? Or, is the splash oiling of the piston enough to push it out through the holes?
I usually spin my pistons in a lathe to balance them
|
|
MadMike
1600dp
Posts: 3,277
Joined: Oct 30, 2008 10:21:12 GMT -5
|
Post by MadMike on Feb 17, 2015 7:37:42 GMT -5
This was done on 125cc MXpistons for better lube/cooling on the exhast bridge, made the piston last longer between builds.
At 8000 rpm I think the oil will be splashing around may help with cooling the piston? can't hurt,LOL
I usually just remove a tiny bit under the crown for balancing with a fat drill bit or my porting tool
|
|
vw1s
1600dp
I am Jack's Medulla Oblongata...
Posts: 1,841
Joined: Jun 25, 2008 5:16:14 GMT -5
|
old trick
Feb 17, 2015 18:46:48 GMT -5
via mobile
Post by vw1s on Feb 17, 2015 18:46:48 GMT -5
I understand how it could be benificial on a more vertical engine, like that of a bike, as the splash oiling WILL make its way through the holes. When you lay the piston on it's side, things change, I can see how the bottom side of the piston would receive what oil is splashed up and drains through the holes, but, on top of the piston, wouldn't the oil that is splashed up to the outside of the piston be more likely to drain back through to the inside?
Just a question... I'm not gonna crawl inside your engine to see what the oil is doing! ;D
|
|
MadMike
1600dp
Posts: 3,277
Joined: Oct 30, 2008 10:21:12 GMT -5
|
Post by MadMike on Feb 18, 2015 8:28:41 GMT -5
I know what you talkin about,but I don't have Porsche Piston squirters or a crank submerged splashing oil(Dry sump or Berg 4qt haven't made up my mind yet?) so it's not an issue, heck the coating is barely worn off (see pic) yea their used for a few passes,LOL
|
|
vw1s
1600dp
I am Jack's Medulla Oblongata...
Posts: 1,841
Joined: Jun 25, 2008 5:16:14 GMT -5
|
old trick
Feb 18, 2015 19:13:27 GMT -5
via mobile
Post by vw1s on Feb 18, 2015 19:13:27 GMT -5
Ahhh, yes. But, ummm, one last thing....I thought you said you were done going fast!?!?! |
|
MadMike
1600dp
Posts: 3,277
Joined: Oct 30, 2008 10:21:12 GMT -5
|
Post by MadMike on Feb 19, 2015 8:01:19 GMT -5
Well your close. I said 'maybe'time to slow down. since I became a Grandpa  |
|
