rings seating in

carboy · 03-16-2002, 01:50 PM

well my engine is finally running good, but i have a problem with number 8 cyl. it was smoking real bad but after i changed the oil for the 1st time after 2 hrs running it's not smoking as much.
after my fresh rebuild and a trial and error on plug wire placement i'm finally running on all 8 cyl. i think that lots of fuel was getting into my oil from the 4 cyl that weren't firing before. when i changed the oil it was real thin and smelled of fuel.
my concern is that i hope i don't have to pull my engine and redo the rings on #8 cyl. when checking the plugs only #8 is black. i have 150 lbs on each cyl for compression. and now it still smokes a little after about 10 min of running , then when you give it the gas a little more comes out...anyone have an idea how long i should give it for the rings to settle in. i haven't cruised down the highway yet, i'm still 2 weeks away from that. i just run it for 20 min at a time in the driveway.

PKRWUD · 03-16-2002, 02:00 PM

You need to go around the block a few times, and just stab it hard, then back off, then stab it hard, then back off, etc., several times. Otherwise, you may have a ring that doesn't seat. I'm very serious.

Take care,
-Chris

Rev · 03-16-2002, 08:16 PM

I think that's right. I would drive it around for 500-1000 miles, but not really hard. If the rings (moly) haven't seated by then , they probably aren't gonna.

Rev

Gearhead999 · 03-16-2002, 09:02 PM

Give it about 500 miles or so. Just drive it normal. Don't let it idle for long periods of time and make sure it is cooled off when you shut it down. I'd also stay away from long cruises at a constant rpm.

Are you sure you didn't line the rings up on that cyl ??
How about breaking a ring when you installed the piston??
Did you install the oil scraper correctly, no overlap???

carboy · 03-16-2002, 11:59 PM

i didn't build the engine. a friend of a friend that builds local circle track engines built it and he says also to run it down the freeway for a while and see what happens. he also stands behind his work and says if #8 cyl is getting blowby than it's probably from all that fuel getting in there and not letting the rings seat properly. he also says if it doesn't get better he will tear it back down and fix it for free. the only thing is i have to pull the engine myself and get it to his shop.
so i guess i'll take ya'lls advise and run it down the road in a couple of weeks and just see what happens.
thanks again guys, preciate all the good info.

PKRWUD · 03-17-2002, 08:12 AM

Not trying to repeat myself, but the best method for seating moly rings is to generate several short, hard revs under load, and to then let the engines compression braking slow the vehicle down. This loads the rings in both directions. Drive around the block, and while in 2nd gear, floor it for 4 seconds, then back off and let the engine slow the car down, then do it again. 6 or 7 of these should seat the rings.

Take care,
-Chris

carboy · 03-17-2002, 09:45 AM

that makes sense. thanks for the info. i'll give it a try and get back with you.

Rev · 03-20-2002, 10:17 PM

Forcing hot combustion gasses past unseated rings doesn't seem like a good idea to me. I would take a more gentle approach and hope for a more gradual "wear in". Moly rings should do that without any thing extreme if the cylinder walls were honed correctly.

Rev

carboy · 03-20-2002, 11:37 PM

thanks for the info Rev. i'm finishing welding on my rear quarter panels on tomorrow and then i'll have a fairly street legal car. then it's license, insurance, and paint time. but i'll take it down the street probably tomorrow night and check it out. i'm gonna have to get one of the digital cameras so i can post some pics.

03-16-2002, 01:50 PM	#1
carboy Registered Member Join Date: Jan 2000 Location: Corpus Christi, Texas Posts: 66	rings seating in well my engine is finally running good, but i have a problem with number 8 cyl. it was smoking real bad but after i changed the oil for the 1st time after 2 hrs running it's not smoking as much. after my fresh rebuild and a trial and error on plug wire placement i'm finally running on all 8 cyl. i think that lots of fuel was getting into my oil from the 4 cyl that weren't firing before. when i changed the oil it was real thin and smelled of fuel. my concern is that i hope i don't have to pull my engine and redo the rings on #8 cyl. when checking the plugs only #8 is black. i have 150 lbs on each cyl for compression. and now it still smokes a little after about 10 min of running , then when you give it the gas a little more comes out...anyone have an idea how long i should give it for the rings to settle in. i haven't cruised down the highway yet, i'm still 2 weeks away from that. i just run it for 20 min at a time in the driveway. __________________ 66 coupe, 306 balanced bluprinted, performer intake,725 Road Demon, Crane Cam, Tri-Y Headers, factory Shelby glass packs 2 1/4 with exit in front of rear wheels, 3:50 rear, 8 inch rear, mustang plus suspension, 41/2 mideye leafs, 620 springs on front, kyb gas shocks. tony branda shelby hood, r-model valance, rear side scoops(functional),stainless steel slotted front brake system,,13.39 1/4 mile with no slicks and no posi.

03-16-2002, 02:00 PM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	You need to go around the block a few times, and just stab it hard, then back off, then stab it hard, then back off, etc., several times. Otherwise, you may have a ring that doesn't seat. I'm very serious. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

03-16-2002, 08:16 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	I think that's right. I would drive it around for 500-1000 miles, but not really hard. If the rings (moly) haven't seated by then , they probably aren't gonna. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

03-16-2002, 09:02 PM	#4
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Give it about 500 miles or so. Just drive it normal. Don't let it idle for long periods of time and make sure it is cooled off when you shut it down. I'd also stay away from long cruises at a constant rpm. Are you sure you didn't line the rings up on that cyl ?? How about breaking a ring when you installed the piston?? Did you install the oil scraper correctly, no overlap??? __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

03-16-2002, 11:59 PM	#5
carboy Registered Member Join Date: Jan 2000 Location: Corpus Christi, Texas Posts: 66	i didn't build the engine. a friend of a friend that builds local circle track engines built it and he says also to run it down the freeway for a while and see what happens. he also stands behind his work and says if #8 cyl is getting blowby than it's probably from all that fuel getting in there and not letting the rings seat properly. he also says if it doesn't get better he will tear it back down and fix it for free. the only thing is i have to pull the engine myself and get it to his shop. so i guess i'll take ya'lls advise and run it down the road in a couple of weeks and just see what happens. thanks again guys, preciate all the good info. __________________ 66 coupe, 306 balanced bluprinted, performer intake,725 Road Demon, Crane Cam, Tri-Y Headers, factory Shelby glass packs 2 1/4 with exit in front of rear wheels, 3:50 rear, 8 inch rear, mustang plus suspension, 41/2 mideye leafs, 620 springs on front, kyb gas shocks. tony branda shelby hood, r-model valance, rear side scoops(functional),stainless steel slotted front brake system,,13.39 1/4 mile with no slicks and no posi.

03-17-2002, 08:12 AM	#6
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Not trying to repeat myself, but the best method for seating moly rings is to generate several short, hard revs under load, and to then let the engines compression braking slow the vehicle down. This loads the rings in both directions. Drive around the block, and while in 2nd gear, floor it for 4 seconds, then back off and let the engine slow the car down, then do it again. 6 or 7 of these should seat the rings. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

03-17-2002, 09:45 AM	#7
carboy Registered Member Join Date: Jan 2000 Location: Corpus Christi, Texas Posts: 66	that makes sense. thanks for the info. i'll give it a try and get back with you. __________________ 66 coupe, 306 balanced bluprinted, performer intake,725 Road Demon, Crane Cam, Tri-Y Headers, factory Shelby glass packs 2 1/4 with exit in front of rear wheels, 3:50 rear, 8 inch rear, mustang plus suspension, 41/2 mideye leafs, 620 springs on front, kyb gas shocks. tony branda shelby hood, r-model valance, rear side scoops(functional),stainless steel slotted front brake system,,13.39 1/4 mile with no slicks and no posi.

03-20-2002, 10:17 PM	#8
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Forcing hot combustion gasses past unseated rings doesn't seem like a good idea to me. I would take a more gentle approach and hope for a more gradual "wear in". Moly rings should do that without any thing extreme if the cylinder walls were honed correctly. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

03-20-2002, 11:37 PM	#9
carboy Registered Member Join Date: Jan 2000 Location: Corpus Christi, Texas Posts: 66	thanks for the info Rev. i'm finishing welding on my rear quarter panels on tomorrow and then i'll have a fairly street legal car. then it's license, insurance, and paint time. but i'll take it down the street probably tomorrow night and check it out. i'm gonna have to get one of the digital cameras so i can post some pics. __________________ 66 coupe, 306 balanced bluprinted, performer intake,725 Road Demon, Crane Cam, Tri-Y Headers, factory Shelby glass packs 2 1/4 with exit in front of rear wheels, 3:50 rear, 8 inch rear, mustang plus suspension, 41/2 mideye leafs, 620 springs on front, kyb gas shocks. tony branda shelby hood, r-model valance, rear side scoops(functional),stainless steel slotted front brake system,,13.39 1/4 mile with no slicks and no posi.

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