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Engine Specific Info and Questions => IDI Engine => Topic started by: RabbitJockey on November 16, 2006, 02:40:45 pm
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so i got my rabbit back together and running and inspected. i drove it around giving varying loads and all that to hopefully help the rings wear in real nice like. now today on my way to school i was cruising around 55-60, and after a couple miles of this i felt it start pulling a little bit on its own and smoking, luckily this time i knew better and had it in drive, so i hit the brakes and it stopped, then i pulled over and pulled the ccv off of the intake and left it sit on top of the intake and drove the rest of the way to school. but this is very frustrating.
for anyone that didn't know, this car ran away so bad previously that it blew up, and now it has new rings in it (just a patch job not rebored or anything) anyways, oh yeah and it has a brand spanking new head on it.
Is there anything else than can cause blow by and make these things run away? or is it the piston rings. i was theorizing that it could be because the rings are not quite seated yet, and because it is an automatic, and on the highway this car is absolutely screaming, if i had to guess i would say the final gear in this 3 speed automatic is in between 3rd and 4th gear on my ff, closer to third than 4th surely. so in combination with it being screaming down the highway and its fresh rings, perhaps it has yet to seal nicely, allowing this to happen
so anyone with ideas please please please let me know.
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maybe the cyl walls are tappered severly or the crosshatching on cylinder walls is worn so oil stil slips past the rings.
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new rings will not seat on an unhoned cylinder wall.
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which is funny cause i was like dad you wanna take the 10 minutes to take us to hone these. and he's like now... i think eventually the rings will seat? or i am just having wishful think, its hard to say though too since there is only 65 miles on it since the rings
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my first jetta i bought from my mechanic had new rings put in. he didn't bother honing. the car burnt oil for quite a while... maybe 6-8 months (i didn't do much driving.. just here and there)... month before my collision, it had stopped burning oil... don't know if thats seated or not, but i was really happy... then the burning sensation from losing that car that i worked so hard to 'break in' really sucked...
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new rings will not seat on an unhoned cylinder wall.
Yes. I found this out the hard way. My Mazda with brand new pistons and total seal rings burns a quart of 20w-50 every 250 miles, because I didnt hone the cyls. I have to pull the motor out and do it all over again.
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i definetly wouldn't have used total seals with out honing
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my old car burnt 1 qt around every 600km if i drove it hard (50% of the time)
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i saw a friend of the boss do a 1/2 arse hone job once
he didnt wanna hone the cyls but decided he should after he installed the pistons
so he did
lol it was funny
and it ran ok too,i couldnt believe it
but thats hillfolk :lol:
he just wiped out the grit the best he could,and said"that extra grit will help the rings seat"
lol i was rofl
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haha that's grand. i'll just have to beat on it a bit and see what happens, till then the ccv is not on the intake
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To seat the rings on propane engines they used to blow a powdered abasive cleaner like Ajax in the intake. I still have a Impco manual that describes that. It was also done on HD diesel engines.
Rev the engine up by hand and sprinkle some into the intake.
Just don't put too much in, you can really hear the engine slow down and than loosen up. Too much on a new engine and it may seize up!
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i took my old car out and drove about 160km/h for about 30 mins or so on the highway... that must've done something... (other than burning oil... :lol: )
it nearly cut my trip time in half!!! and i was surprised at how little fuel it used (new to diesels)
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been driving it all this week, seems like it keeps getting tighter, i put a catch on it, it's a soda bottle with some slashes and holes in the bottom, that didn't seem to catch anything, and sometimes you could see steamy kinda stuff coming out of it, so i stuffed some paper towels and tissues (just to get 2 different materials into it lightly, not crammed, but like 4-5 in there i have driven it almost 100 miles since then, and there is a bit of oil just where there hose enters the bottle. nothing is soaked or anything, i think the problem the first was that i took it on the highway when it barely had any miles on it, and that 3 speed automatic is geared horrible so with the motor all revved up it caused my little incident. for now i'm gonna keep the breather/catch on it and see how things go
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in my prev post, i was surprised at how little fuel it used, but was also surprised at how much oil it consumed... :lol:
the oil consumption gradually decreased :) i was happy!
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i haven't been impressed with the fuel consumption on this car yet, seems to be in the 30 range, lower 30's too, but i guess that is the cost of an automatic... it will probably do a little better the more i drive it though... i'm hoping for atleast high 30s, thinking that isn't too optimistic. the car sure would be nice with a 5 speed.
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haha maybe the oil made up for the fuel, i know a guy that shoots propane in his 1.6td vanagon (bad idea haha) and he said he gets better mileage that way. around 36mpg in a damn westfalia, i think that's pretty impressive
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yeah i did a cheap rebuild of the top end of my jeep and ended up consuming like a quart of oil an hour. i talked to the engine builder who helpeed me and he said that the oil rings were shot and that thats pretty common when just the top end is done. so sure enough i tore down the engine and the oil rings were siezed to the grooves. apperantly the people who owned it before me changed the oil like every 100,000 miles or so, whether it needed it or not :shock: so now its getting bored and trued up.
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i think around town if you accelerated gradually you could get 40 mpg... highway driving you'd definitely suffer though from the high rpm's... just like my gasoline powered golf :(
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yeah my brothers s10 pick up is like that, on the highway even at moderate speeds like 60-75 it will suck the 20 gallon tank dry, and then when its done with that it will suck the oil pan dry, ***ing junk
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the oil i was burning was dissplacing oxygen in the exhaust so the o2 sensor was reading way rich which cut back on the fuel so i had no power. i might have had better gas milage (not counting the oil lol)if i had drove it more than a mile.
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I lose about 200 kms a tank if I drive over 110 kph, I need taller gearing
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I lose about 200 kms a tank if I drive over 110 kph, I need taller gearing
what tranny code you using?
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4S, I think my winters are smaller then they are suppose to be though
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so now it has 400 miles on it, with the oil cap off it has less blow by than both my turbo diesel which has less than 100,000 on it and my dads turbo diesel which was rebuilt like 2 years ago, it runs good and stuff, and with the breather thing that i made for it, in a weeks worth of driving and over 200 miles, it didn't collect very much oil, you could see some spots on the paper towels where it had dampened from it, but nothing excessive, then my dad felt it was his duty to run the thing up and down the highway, he probably did a total of 15-20 miles on the highway going 55-65, and a spurt up to 70. when he came back i checked the bottle, and all the paper towels in it where soaked, and the bottle was very noticably heavier than when he had left, which it only weighed as much as an empty small soda bottle with paper towels stuffed in it... i don't know if it is just that the rings haven't sat on it quite yet (which i doubt because it runs so well and doesn't have blow by in normal driving below 50) i think it is the gearing+the recent rebuild that seems to cause this issue... i beliece with a 5 speed this car would be awesome... but i really lioke the automatic for the daily commuting, and i already have a buyer for it once i am done driving it in the spring, he wants an automatic diesel for his wife. oh eah, and now the tranny is making some funky noises, so we'll see how that works out haha