racer86
Posted a lot
'72 BMW 2002 / '72 Alpine A110 Gordini
Posts: 2,184
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Dec 30, 2004 22:22:23 GMT
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Just a bit of advice really. i rebuilt the engine with new big ends and mains, the piston rings had already ran in the bores so are already run in. so how long should i run it in for (or more to the point how many miles before i can thrash the conkers off it!) when i first started it i filled it with cheap oil and ran it at 2000 rpm for 20 mins then changed the oil (Duckhams good oil 20/50w) and filter. ive so far done 70 miles with a rev limit of between 2000 to 3500 without loading it up of keeping the revs constant for too long. am i doing it right or is there a better way ? cheers fellas!
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Dec 30, 2004 22:27:51 GMT
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yeah every 100-150 miles add 500 revs to yer limit
shouldnt take long
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2001 HONDA CT110 (NOT RCV)
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Dec 30, 2004 22:54:20 GMT
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I was taught not to top 3500 rpm for the first 1000 miles. But later other folk said this will mean that your engine will never want to rev & you should use it noramlly straigt outta the box. Don't know how much truth there is in that....
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racer86
Posted a lot
'72 BMW 2002 / '72 Alpine A110 Gordini
Posts: 2,184
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Dec 30, 2004 23:01:31 GMT
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the other thing is the oil pressure is 60psi at 3000 rpm but at idle (1200 due to cam) its 20 psi is this ok? its better than it was but i had no bearings left before!
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Dec 30, 2004 23:13:03 GMT
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I wouldn't think high oil pressure is anything to worry about - my Merc runs at about 25psi at idle and up to 45psi when the revs pick up. As for running in the engine - I'm not entirely sure, but taking it easy for the first 1000 miles sounds like a fairly good rule of thumb.
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Dec 30, 2004 23:19:06 GMT
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It probably depends engine to engine as well, I mean 3500 revs in a Volvo for example is somewhere near the middle of its capabilities, so still not too high, but for an Imp 3500 revs is curse word all, and if you stuck to that it couldn't pull your grannie out of bed!
I remember I knew two guys who worked at a local haulage yard, who were both put on identical brand new Scanias, doing the very same kinds of work for the very same clients. One guy went very easy on his engine for the first weeks he had it, and the lorry ended up dour and low on torque until the day they got shot of the thing. The other guy kicked f*ck out of his Scannie, and didn't go any easier on it than he would have in any other. That motor lasted years longer than the other, and had far better performance and fuel economy, which you really noticed once it started doing jobs in the far north of scotland, round the distilleries in the whiskey trail area etc.
So I suppose the moral is that you shouldn't go too easy on the engine, or it'll be dour and gutless. I think. Maybe different rules apply to car sized petrol engines, I'm not sure.
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"He's not the messiah, he's a very naughty boy!"
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racer86
Posted a lot
'72 BMW 2002 / '72 Alpine A110 Gordini
Posts: 2,184
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i heard along those lines it was the same story with the old pinto powered trannys and sierras. the sierras had to have new cams after 15000 miles but the vans whent forever as they were thrashed!
i was worried that oil pressure was not enough.
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Dec 31, 2004 12:41:08 GMT
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When I re-built my engine [it was actually in my old Mk1 at the time] I ran it on a high tickover on cheapo oil, then re-filled / filtered on the ''usual'' oil. I did change the oil every 2 months to start with & did try to take it easy running it in but didn't stick to it at all really ;D Good intentions, out the window ;D
That was about mid '90's, then the car was written off, the engine sat behind my Nan's shed for a few years, then I needed it urgently for my current car so replaced the sump gasket & fitted it!!!! That was 3-4 years ago now & the engine is sound [/li][li] It loses no oil, the oil doesn't even go dark when it's change time, & it revs off the clock!!!
Think you will hear lots of different advice on this subject ;D
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racer86
Posted a lot
'72 BMW 2002 / '72 Alpine A110 Gordini
Posts: 2,184
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i think I'm gonna keep it gentle for the first 200 miles then build it up over a 100 miles. its only the big ends and mains that need running in and think how many times the crank has span in them already after 100 miles if something was wrong it would have died by now! i think ive just talked myself out of it, I'm off for a rag!! cheers ratters!
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