Moorron
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 posted on 29/9/08 at 11:12 AM |
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smoking car after rebuild
I am getting as fed up as you with my posts on smoking cars. But here is another!
Engine cbr1000f.
Put new pistons and rings in the car with hones bores (was suggested it would be ok to use standard sized pistons as the bores weren’t worn). Car runs
fine but now after 100 miles i am starting to use more revs and when I do I get blue smoke from the exhaust, not a smoke screen but clearly cloudy in
the mirror. Would a new engine do this until the rings have bed in after a few more hundred miles? I have even compression over all cylinders but it
reads lower than the book suggest.
Will it get better or have I got a problem again? grrrrrr
cheers
Sorry about my spelling, im an engineer and only work in numbers.
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Mr Whippy
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| posted on 29/9/08 at 11:38 AM |
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do at least 500 miles then panic, takes ages for things to bed in. Don't thrash it and change the oil quite regularly. Best to just spend a
whole day out in the countryside doing lazy driving, best way to run in an engine
Fame is when your old car is plastered all over the internet
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Moorron
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| posted on 29/9/08 at 11:52 AM |
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lol 500 miles will take me 2 years.
ok i will put off my panic attacks ofr now. Lets see if the weather will hold out beofre winter sets in so i can see if my winter work is drinking or
rebuilding.
Sorry about my spelling, im an engineer and only work in numbers.
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Mr Whippy
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| posted on 29/9/08 at 12:13 PM |
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quote:
Originally posted by Moorron
lol 500 miles will take me 2 years.
ok i will put off my panic attacks ofr now. Lets see if the weather will hold out beofre winter sets in so i can see if my winter work is drinking or
rebuilding.
eh? I could clock up over a 1000miles in one day in the Falcon just going for a wander. Even when I got my new cbr125 I did the 500mile run in during
one day then took it to honda for its first service the next day 
Fame is when your old car is plastered all over the internet
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modee
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| posted on 29/9/08 at 12:22 PM |
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If you ran it in on synthetic oil the rings may never bed in. always use running in oil.
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oldtimer
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| posted on 29/9/08 at 12:37 PM |
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I agree with the above, too many detergents etc in modern oils. Running in oil is the biz. Some rebuilders also say that whilst high revs should be
avoided, loading an engine is necessary to properly bed things in?!!?......
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Moorron
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| posted on 29/9/08 at 01:39 PM |
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quote:
Originally posted by modee
If you ran it in on synthetic oil the rings may never bed in. always use running in oil.
where do i get this from and will it damage the clutch plates on the bike engine?
am i too late?
Sorry about my spelling, im an engineer and only work in numbers.
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oldtimer
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| posted on 29/9/08 at 01:56 PM |
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Mine is Penrite Running-In Oil, not sure where you get it. I got mine from the rebuilder. It is a 20/50 non modified oil. The rebuilder said the best
thing you could do was get a passenger and drive under load up hills, sounds odd but he said that was what worked. Are you too late? I doubt it, not
many use running-in oil anyways.
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C10CoryM
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| posted on 29/9/08 at 02:01 PM |
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If you are using hard rings you need to break them in. You need to roll into the throttle under load in a higher gear a few times. The reason is to
get the highest pressures possible in the chamber to force the rings against the walls to wear them in. Synthetic oil is not good for this either.
What are your rings made of or coated with?
"Our watchword evermore shall be: The Maple Leaf Forever!"
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MikeR
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| posted on 29/9/08 at 02:57 PM |
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bear in mind he has a turbo and has already thrashed it (i know a bloke he works with )
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Moorron
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| posted on 29/9/08 at 03:02 PM |
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dont know what the rings are, just standard honda new ones.
Ive left the turbo off it this time thinking it was the cause of the old pistons breaking so its like a factory engine at the moment.
It doesnt smoke at lower revs at all, but is clearly visable above 5k.
Mike, i doubt you were working with leon, from what i know of him he does nothing at work but pester me. lol
Sorry about my spelling, im an engineer and only work in numbers.
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l0rd
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| posted on 29/9/08 at 03:21 PM |
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Or, you can give it to me and will do the 500 miles in less than a week.
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C10CoryM
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| posted on 30/9/08 at 02:52 AM |
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Ok, reason I asked is because some older bikes used very hard rings to deal with the high RPMs. I would guess by now they are moly coated.
Basically the idea is you hone the cylinders to rough them up a bit so that the piston rings and cylinder walls will wear into each other. Like
using valve grinding paste to seat valves.
The roughness of the honing doesn't last long, and you should make the best of it by forcing the rings against the walls as hard as possible.
The pressure made from the power stroke is what pushes the rings out.
So, the general way to break in rings is to:
Get engine to operating temp.
Get onto a quiet road at about 30mph and roll into the throttle and let it run up to near redline.
Repeat rolling into the throttle a few times (fun huh?  )
Now the rings should be 99% seated, and the only way to get the last 1% is to drive the car.
I had a truck that I bought that had been sitting for a long time not running. I wasn't sure if I was going to win on it or not. Got it
running, everything worked fine except it burned a lot of oil. Tried to break it in a bit like that and it helped a little. Eventually I got pissed
off at it and started to thrash it HARD. After running the snot out of it for a while the rings finally re-seated and it stopped smoking . Not
saying it's time for this in your case, but eventually it may come to that.
Cheers.
Cory
"Our watchword evermore shall be: The Maple Leaf Forever!"
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02GF74
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| posted on 1/10/08 at 09:14 AM |
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corym seems to be an example that this works.
I have post itbefore but here it is again
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Moorron
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| posted on 1/10/08 at 10:15 AM |
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cheers for the info i have seen that site before but doesnt help me as it doesnt suggest what is a new engine or old one (mines a 1988 model). When
the weather gives me a break i will go and nail it and see what happenes.
Sorry about my spelling, im an engineer and only work in numbers.
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MikeRJ
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| posted on 1/10/08 at 06:39 PM |
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Did you check the ring gaps when you rebuilt the engine?
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Moorron
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| posted on 1/10/08 at 09:38 PM |
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They were at top tolerance but some way off the service limit (i have no idea why theres a difference of top tol and service limit as i thought it
would be the same?)
Sorry about my spelling, im an engineer and only work in numbers.
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