re-ringing a short block, cast or moly rings?
#368053
07/06/09 12:50 PM
07/06/09 12:50 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
short block in question is a 1986 vintage 318, 76k miles on it.
there is no ridge detectable with a fingernail, and you can still see the cross hatching
I wasn't really planning on even touching the rings, but last year I sold the '302 heads off the motor, and apparently I didn't do a super job cleaning things up after I took them off and there was a little bit of coolant sitting in the #4 and #6 cyls. I can't feel anything with my finger/fingernail, but there is some slight discoloration in the cylinders, that's why I'm thinking of tossing new rings in.
should I leave it as is, or toss some new rings in it while I have it apart?
I have one of those 3 finger, spring loaded hone/deglazers that I can run through the bores to clean it up, or I know someone with a ball hone that I can borrow. which would be better? also, if I toss new rings in, should I get plain cast, or plasma moly coated?
thanks in advance.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: re-ringing a short block, cast or moly rings?
[Re: patrick]
#368055
07/06/09 01:17 PM
07/06/09 01:17 PM
|
Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
|
Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
|
If you are not re boring the holes with new pistons get the plain iron. It will seat easier.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
|
|
|
Re: re-ringing a short block, cast or moly rings?
[Re: MoparforLife]
#368056
07/06/09 02:12 PM
07/06/09 02:12 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
Quote:
For the amount of miles these engiens will get I would run a deglazing hone through the bores and put a fresh cross hatch in and new rod bearings and a set of less expensive cast rings and be don with it. 
I'm going to pull the pan and check the rod/main bearings. last time we tore apart one of these was back in high school, my dad's '85 5th ave had 150k miles on it, we pulled it out to fix some oil leaks, popped the main and rod caps and checked them, all were still within spec.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: re-ringing a short block, cast or moly rings?
[Re: patrick]
#368057
07/07/09 09:21 PM
07/07/09 09:21 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
question #2 get stock bore 3.91" rings, or 3.915" rings (.040 over 283 chev rings)and file fit them? they're about the same price
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: re-ringing a short block, cast or moly rings?
[Re: RapidRobert]
#368059
07/07/09 09:45 PM
07/07/09 09:45 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
well, I spent some time in the garage tonight looking at it closer, and there are some pits in the 2 cyls, so I'm definitely going to clean them up and put new rings in...hopefully they'll clean up, as I really don't want to afford new pistons and a bore job....  the wife won't like it if I have to bore w/pistons
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: re-ringing a short block, cast or moly rings?
[Re: RapidRobert]
#368060
07/08/09 12:26 AM
07/08/09 12:26 AM
|
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
|
Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
|
Quote:
good idea & I am in the minority on this but I would not hone it & get plasma moly
I've heard you and a few people on other websites say to do this as well, but I have yet to actually hear from someone who's put moly rings in a glazed, shiney cylinder. Until we can hear some real-world results, I'll have to say to stick with the cast rings and a drill hone job. They say cast rings do a better job of sealing to a worn cylinder, although if the factory crosshatching is still visible that's not your problem(also why I would not bother with file fit rings in your application). Anyway the cast rings with a drill hone are a proven time and again way of doing it.
|
|
|
Re: re-ringing a short block, cast or moly rings?
[Re: DaytonaTurbo]
#368061
07/08/09 11:39 AM
07/08/09 11:39 AM
|
Joined: Nov 2008
Posts: 671
Wisconsin USA
Bill MeLater
mopar
|
mopar
Joined: Nov 2008
Posts: 671
Wisconsin USA
|
Quote:
Quote:
good idea & I am in the minority on this but I would not hone it & get plasma moly
I've heard you and a few people on other websites say to do this as well, but I have yet to actually hear from someone who's put moly rings in a glazed, shiney cylinder. Until we can hear some real-world results, I'll have to say to stick with the cast rings and a drill hone job. They say cast rings do a better job of sealing to a worn cylinder, although if the factory crosshatching is still visible that's not your problem(also why I would not bother with file fit rings in your application). Anyway the cast rings with a drill hone are a proven time and again way of doing it.
Here's a pic of mine round 500 miles on it. Ball honed stock bore w/speed pro moly file fits. Seated real quick. I was gonna go w/iron but couldn't find file fits. Bores were nice and round but had .002-.0025 taper so standard ring set end gaps would have been stupid. Ran great untill I holed the radiator, overheated it and hung a couple of valves. Minimal damage though, should be up again by this weekend.
|
|
|
|
|
