Machining question
12-11-2004, 01:29 AM
#1
Wax On, Wax Off
Rennlist Member
Rennlist Member
Thread Starter
Join Date: May 2003
Location: 5280 ft above the sea
Posts: 17,727
Likes: 0
Received 3 Likes
on
3 Posts
Machining question
I'm thinking about rebuilding my spare engine just for kicks, so that way the car can have the original engine in it. However, there is a pretty good scratch in Cylinder 1. I'm wondering, to have the scratch machined out, is there a way they can fill it or do I need to have the bore redone and ground past it?
If it needs to be bored, that requires new pistons, am I correct in this thinking?
Thanks guys!
If it needs to be bored, that requires new pistons, am I correct in this thinking?
Thanks guys!
12-11-2004, 01:46 AM
#4
Three Wheelin'
Join Date: Apr 2003
Location: State College, PA
Posts: 1,362
Likes: 0
Received 0 Likes
on
0 Posts
I would go buy a feeler gauge and measure the score. Then compare it to factory specs and see how much they allow before a rebuild.
On the other hand, you can have that cylinder bored and have a dry sleeve inserted, and then I do not think you should need new pistons. On an aluminium block there is no way to fill the score that is for sure.
On the other hand, you can have that cylinder bored and have a dry sleeve inserted, and then I do not think you should need new pistons. On an aluminium block there is no way to fill the score that is for sure.
12-11-2004, 01:49 AM
#5
Advanced
Join Date: Dec 2004
Location: in a cave
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
your best bet would be to take it to a machine shop and ask their opinion. If its relatively small it can be sanded with a really fine grade sandpaper, dont attempt this yourself as the whole cylinder must receive equal sanding and its hard to do without proper machining tools. If its too deep they would have to bore it out. You would then need bigger pistons. This is all dependent on the depth of the scratch. Take it to a machine shop first.
12-11-2004, 10:18 AM
#7
Addict
Rennlist Member
Rennlist Member
If you can feel it with your fingernail, it's def above .005 surface defect. It might be possible to polish it out a bit, but the only way to eradicate it is boring. Not very many machine shops can handle an alusil block. Be careful who you choose.
Trending Topics
12-11-2004, 02:20 PM
#8
Three Wheelin'
Join Date: Apr 2003
Location: State College, PA
Posts: 1,362
Likes: 0
Received 0 Likes
on
0 Posts
What exactly would be the point of sanding the block? Then the clearance would be that much bigger all around the score, allowing for even more blowby and less compression. I already said it once, I guess I will say it again. If you bore it out you can get dry sleeves installed without needing new pistons.
Also, if you bore it out it does not matter if they can handle the alusil coating around the cylinders, as they will need to install sleeves no matter what.
Also, if you bore it out it does not matter if they can handle the alusil coating around the cylinders, as they will need to install sleeves no matter what.