|
By EDHYBLOCKER - 9 Years Ago
|
Curious as to which best to install? 312 bored .60 Mummert pop up forged pistons and Forged rods/ mild cam /113 heads/B intake...Plan is weekend cruiser some road trips cast or molly?
Thanks,
Gary
|
|
By aussiebill - 9 Years Ago
|
EDHYBLOCKER (2/2/2016)
Curious as to which best to install? 312 bored .60 Mummert pop up forged pistons and Forged rods/ mild cam /113 heads/B intake...Plan is weekend cruiser some road trips cast or molly? Thanks, Gary
Whats john suggest ?
|
|
By Cliff - 9 Years Ago
|
|
I would use anything but cast.
|
|
By speedpro56 - 9 Years Ago
|
Molly period. They cost a little more but last a lot longer.
|
|
By 2721955meteor - 9 Years Ago
|
|
Molley for sure,fast breakin,more hp,easey on cylwalls.
|
|
By '60 Fairlane - 9 Years Ago
|
Cast rings are typically used in a "re-ringing" type low budget overhaul. With new pistons and fresh straight cylinder wall I'd go with what John recommends for the forged pistons he sell.
-Dave
|
|
By PF Arcand - 9 Years Ago
|
As Dave notes, cast rings are usually only used these days, for low budget hone out & re ring jobs. Moly rings of some sort are better all around.
|
|
By NoShortcuts - 9 Years Ago
|
I agree with what's been said. At an earlier time, cast rings were said to be used in race car engine teardowns because they would seat quickly in re-ring jobs where you weren't doing an actual re-build.
I'm ancient enough that I remember using chrome rings for rebuilds! No, they weren't shiny! 
|
|
By 2721955meteor - 9 Years Ago
|
|
In my prev life as service manager for large cat dealer we went threw cronic piston sizure on v engines(3408 3412s), the cause came to light some bean counter at cat elected to delete mollry rings from v engines,not for inline 3406s as the 3406 was putting out considerable more hp pr cu in.they had no such isues and as 06,08 12 used same pistons. so afte rchanging back to molley all went well. but to get the best out of molley the cylinder walls must be honed to a finer finish, 3208 small truck engines had 2 ring pistons top molley,if cyle finish not correct early failure was a result. we used machine shop noted for race cars to get correct finish on 3208s. just a bit of historey on molley rings
|
|
By 57RancheroJim - 9 Years Ago
|
So what is the difference in cylinder wall wear Moly vs Cast? I built my 292 from a 272 block bored to std 292 bore. I saw a set of factory OEM rings on Ebay for cheap and used them. I figure with todays better oils and being my age I won't be able to drive enough miles to wear them out. The factory replacement rings come in boxed sets for two cylinders, thought that was strange..
|
|
By Small block - 9 Years Ago
|
|
The cast ring and moly are about the same for bore ware but the moly ring will seal for a longer period, Chrome Rings seal well but they eat up the bore!
|
|
By Cliff - 9 Years Ago
|
|
The factory rings are good parts, the top ring is chrome, I will be using a set in one of my backup race engines.
|
|
By 57RancheroJim - 9 Years Ago
|
I read somewhere that the factory rings were made by Hastings. But I only believe 50% of anything on the Internet..
|
|
By aussiebill - 9 Years Ago
|
57RancheroJim (2/3/2016)
I read somewhere that the factory rings were made by Hastings. But I only believe 50% of anything on the Internet..
And thats TOO much.!
|
|
By 57RancheroJim - 9 Years Ago
|
aussiebill (2/3/2016)
57RancheroJim (2/3/2016)
I read somewhere that the factory rings were made by Hastings. But I only believe 50% of anything on the Internet.. And thats TOO much.! You are probably right.
|
|
By 2721955meteor - 9 Years Ago
|
|
RANCHERO JIM ,I DOUGHT YOU HAVE ANEY ISUES. MOLLEY RING DECISIONS SHOULD BE MADE AT REBUILD POINT,AS CYLENDER WALL FINISH IS THE KEY. IN A CASE OF RERING YOU WOULD NEED CYL S WITH NO WEAR ANDROOM TO REFINISH BORES WITH CORECT STONES. MY EXP. IS HAVE MACHINIST RESURFACEWITH CORECT STONES AND PREFURABLY AUTOMATED HONE.SOME ONE LIK TED WOULD HAVE THE SPECSAND EQUE TO DO THIS. THE PAY BACK WOULD ONLY BE OBVEOUS ON THE DYNO AND HEAVEY LOADING,OR RACE TRAK USE. BUT FOR MOST OF US LESS PISTON RING DRAG AND VEREY LITLE CYL WEAR WHEN USED WITH PROPER AIR CLEANER AND SURVACE INTERVALS. JUST MYTAKE,AND INFO GLEANED FOME LOCAL EXPERTS
|
|
By 57RancheroJim - 9 Years Ago
|
2721955meteor (2/4/2016)
RANCHERO JIM ,I DOUGHT YOU HAVE ANEY ISUES. MOLLEY RING DECISIONS SHOULD BE MADE AT REBUILD POINT,AS CYLENDER WALL FINISH IS THE KEY. IN A CASE OF RERING YOU WOULD NEED CYL S WITH NO WEAR ANDROOM TO REFINISH BORES WITH CORECT STONES. MY EXP. IS HAVE MACHINIST RESURFACEWITH CORECT STONES AND PREFURABLY AUTOMATED HONE.SOME ONE LIK TED WOULD HAVE THE SPECSAND EQUE TO DO THIS. THE PAY BACK WOULD ONLY BE OBVEOUS ON THE DYNO AND HEAVEY LOADING,OR RACE TRAK USE. BUT FOR MOST OF US LESS PISTON RING DRAG AND VEREY LITLE CYL WEAR WHEN USED WITH PROPER AIR CLEANER AND SURVACE INTERVALS. JUST MYTAKE,AND INFO GLEANED FOME LOCAL EXPERTS I don't expect any issues, it already has 6000 miles on it and I've used cast rings on a lot of engines in the past. I've only used Moly rings once on my 302..
|
|
By 2721955meteor - 9 Years Ago
|
57RancheroJim (2/3/2016)
I read somewhere that the factory rings were made by Hastings. But I only believe 50% of anything on the Internet..
hastings made cast rings, chrome rings as well as molley,as you probley know the molley is sprayed on the top ring,and cylender finish should be finner than chrome and chrome finer finish than cast usualley the ring packs onley differ on the top ring. it apears2nd rings are changed from 1 set to the next. would be interesting to go to a seminar hosted by ring co,s. does any 1 know what the ys at the engine comp used for rings,very impresive results frome the 2 ys in the competition. just read the recent hotrod storey on the Ys
|
|
By 57RancheroJim - 9 Years Ago
|
Yes, I remember the cylinders looked like a mirror finish on the 302 I built using moly rings as opposed to the cross hatch finish for cast.
|
|
By Ted - 9 Years Ago
|
|
For most builds, I’ll use a moly top ring and a cast 2nd ring. Moly rings will stand up to higher temperatures without a loss of radial tension and the second ring in most cases is simply an oil control ring. The moly itself does allow for some oil retention which in itself keeps the wear factor on both the rings and cylinder walls less than what you’ll find on a similar sized cast ring. Radial tension is a key factor here also. Once the ring size drops to 1.2mm or less, there is not enough surface area for a groove for the moly to be imbedded within it. In these cases, I simply use a tool steel top ring. While I personally don’t use rings any thinner than 1.0mm, I have seen rings with the widths as small at 0.027” which is just a tad thicker than a oil ring support rail. While most modern rings prefer a cylinder wall finish or 400 or finer, I have experimented with 800-1000 rms cylinder wall finishes but these can be tricky to break in. With the finer finishes, the initial oil application on the ring prior to installing within the cylinders is important as most ring break in occurs within the first five-ten minutes of engine run in.
|