Moly or Cast?????
Thread Starter
|
Cruiser
Joined: Feb 2007
Posts: 138
Likes: 5
From: Dublin, Ireland.
Thanks for replies.
@IDIDNTDOIT
Before fitting new rings surely you get a re-hone, after a re-bore I presume a honing is done also, if this is the case what is reason for cast if re-ring and moly if re-bored?
Cheers,
TC
@IDIDNTDOIT
Before fitting new rings surely you get a re-hone, after a re-bore I presume a honing is done also, if this is the case what is reason for cast if re-ring and moly if re-bored?
Cheers,
TC
Cruiser
Joined: Nov 2008
Posts: 204
Likes: 0
From: Glenwood, MN
You hone in both cases, leaving you a cross-hatch pattern, but a hone will follow the contour of the bore and is not as true if the cylinders aren't bored. The moly rings are harder and won't adapt as well to any out of roundness. The cylinder can be a little egg shaped and still re-ring OK with cast rings breaking into the shape and not being an oil burner. Hope this helps.
Road Warrior
Joined: Sep 2005
Posts: 1,569
Likes: 12
From: Arizona
every engine rebuild ive ever done ive used moly. seated right off the bat. never used any oil. as i remember, moly for bores that arent perfect, chrome for engines that are going to get a lot of dirt, and cast if you dont give a damn and are going to sell it. like i said ive done more than a few engines and always use moly.
Thread Starter
|
Cruiser
Joined: Feb 2007
Posts: 138
Likes: 5
From: Dublin, Ireland.
Thanks for reply, IDIDNTDOIT, see your point.
But as usual, there is always conflicting views..........................
To be honest, I have ordered Moly, so I suppose I am trying to "feel good" about it, but seeing hotrod351's reply, I feel a bit better.
I will make sure that my cylinders are properly torqued before any work and will get machine shop to check trueness. If he says tolerances are off I will do a re-bore and fit oversize piston kit.
As the say HD, Hundreds of Dollars!!!!!!!!!!!!!!!!!!
TC
But as usual, there is always conflicting views..........................
To be honest, I have ordered Moly, so I suppose I am trying to "feel good" about it, but seeing hotrod351's reply, I feel a bit better.
I will make sure that my cylinders are properly torqued before any work and will get machine shop to check trueness. If he says tolerances are off I will do a re-bore and fit oversize piston kit.
As the say HD, Hundreds of Dollars!!!!!!!!!!!!!!!!!!
TC
Trending Topics
Banned
Joined: Jan 2012
Posts: 3,098
Likes: 474
From: Location location.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Road Warrior
Joined: Sep 2005
Posts: 1,569
Likes: 12
From: Arizona
i had read about the differences in a old engine performance rebuild manual i have, somewhere around here. i also have a friend that is a certified mech. he also uses moly. i can find a article or two that talk about chrome being for extreme dusty or dirt conditions, like off road racing. there harder therefore the cylinder wears faster. i know a lot of people that stick with cast, guess that is what works for them. but as i stated, moly are good for a un-perfect bore and therefore they would also be good for a perfect bore. i do believe that its only the second compression ring that has moly in it and the top is cast. pprobelm is you can get so many different answers that you end up not knowing which ones to use. i think youll be happy with the moly. post back when you get it rebuilt.
Thread
Thread Starter
Forum
Replies
Last Post
Roadflyer
Engine Mechanical Topics
3
Sep 17, 2018 02:50 PM
