i got a chevy 350 and then it was bored out 30 over. the motor has been worked with performer rpm heads, big cam, intake and 650 holley carb. i drove the car for the first time today and noticed when i let off the gas pedal and downshifted to the stop sign it would smoke out the exhaust. it only does it when i let off the gas after the rpm comes down. do the rings and cyl. walls have yet to break in to stop this. will it go away? have you seen new motors or bored out ones do this for a little while? thanks.
2007-03-12 13:19:28 · 8 answers · asked by mike m 2 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
takes a good couple hundred miles for a break-in, more if you used chrome or moly rings. expect a bit of blue smoke for a while, & keep a watchful eye on your oil level.
2007-03-12 13:29:55 · answer #1 · answered by schizophreniabeatsdiningalone 5 · 3⤊ 0⤋
You need to find out if you got the engine already broken in before you installed it, which means some one started the engine after the rebuild and ran it at a steady 1600 RPM to 2000 RPM for 20 -30 minutes to break in the cam, lifters, bearings and rings. If you got the engine and you were supposed to do the break in for the 20 to 30 minutes and you didn't do this, it may have not actually seated the parts correctly. Chrome Moly Rings may take longer to break in. Make sure you are NOT using synthetic oils of any kind for break in. I would change the oil and filter immediately with fresh 10-30 Castrol and check it again. Nothing over 55 miles per hour for 500 miles is what I use for break in period. I don't hold the speed the same, I vary speeds up and down if on the freeway. Full throttle starts wash down the cylinder walls with gas and cause trouble with rings seating.
2007-03-13 02:18:10 · answer #2 · answered by Timer2 3 · 0⤊ 0⤋
How did it feel? Cast iron rings will take up to 10,000 mi to seatHere is what ya do! Red lite to red lite drive it! On the Interstate or 2 lane no faster than 55 mph after 500 mi change the oil and drive it faster on the 2 lane and Interstate.I hope you are using 5w30 to break it in? Small block Chevys do use oil so keep an eye on the oil level and the antifreeze also. Oh Yea the carb ya got is too small go with a 750 Holley or if ya got an Edelbrock ya may have t change jets
2007-03-12 23:26:41 · answer #3 · answered by Anonymous · 0⤊ 1⤋
Any new motor has to cut rings first. All motors smoke in the beginning, and don't run it hard until 3000 miles. You should also change the oil after 300 miles to clean out all the junk that you used in order to lube the cam and crank and everything else. Even though it was bored, rings aren't perfect so they have to cut themselves in. Remember don't push the motor until at least 3,000 miles because you don't want to slip a bearing or knock a valve guide loose or something in that area. All the seals and bearings and the cam have to cut their grooves as well. Especially with a 650 cfm it would be easy to torque out a crank bearing.
2007-03-12 23:13:18 · answer #4 · answered by Russ N 2 · 0⤊ 1⤋
sounds like you have excess fuel going in to the system. Adjust the carb or you may need to change the jets in the carb. what color is the smoke coming out? If it's black then it's fuel..if white it's coolant..if blue it's oil. My guess would be that you are overloading slightly on fuel though.
2007-03-12 21:09:32 · answer #5 · answered by Kenneth S 5 · 0⤊ 0⤋
If your burning oil sounds like you might have got a bad ring job.It should barely smoke the first time out after a rebuild if it does at all.
2007-03-12 22:48:08 · answer #6 · answered by Johnny 4 · 0⤊ 0⤋
you might have to drive it for awhile until the rings get seated before it quits smoking, if it doesn't stop in 1000 miles start worrying.
2007-03-12 20:25:01 · answer #7 · answered by mister ss 7 · 0⤊ 1⤋
what color is the smoke?
2007-03-12 20:28:28 · answer #8 · answered by canadians_are_imbeciles1 2 · 1⤊ 0⤋