tristanh
Part of things
Routinely bewildered
Posts: 990 
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Just curious as to your opinions.
I built up a 2.0 bottom end, with a ported, polished and cammed head for my gti, to replace the tired 1.8 in it.
All new bearings, seals, rings etc.
I usually fill the coolant system with hot water from kettles or the steam cleaner, put in a cheap low grade oil, and get it started, check for leaks,get timing and idling sorted, but trying not to leave it idle for too long.
Then fresh oil , and drive it, continuously accelerating and decelerating, to bed in the rings.
After 20 miles or so of that, I'd try to get some longer spins on it, but never idling or cruising too long.
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Whether you believe you can, or you cannot, you're probably right.
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Did you need/get the bores honed?
If they're fresh with new rings you'd be better using specific running in oil- Millers make really good stuff. Definitely worth doing if you've spent time/money on the build rather than skimp on oil and get "cheap" stuff mate.
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Darkspeed
Club Retro Rides Member
Posts: 4,697
Club RR Member Number: 39
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You want a high Zinc break in oil.
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tristanh
Part of things
Routinely bewildered
Posts: 990
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Feb 24, 2018 10:57:20 GMT
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I did get them properly honed in the machine shop, and new rings.
Good points folks.
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Whether you believe you can, or you cannot, you're probably right.
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Your not far off. If it's a new cam that will need knocking in first. 2000rpm for 20 mins or so. Never let it idle. Start it and straight to 2000. If there's any problems (leaks maybe) stop, fix and start again.
Once that's done then get it out and drive it fairly hard. Just make sure the revs are kept low. Do not labour it in a high gear, get it moving and do some decent acceleration blasts, don't let it idle or treat it too gently. The first few miles make all the difference! After that than gradually build the revs and after it's had a few hours it should be more or less ready to go.
As for oil. I can't knock your usual cheapo oil and would only change it after a good few hours of running. Changing it every 5 mins probably doesn't do any harm but I feel it's a waste personally.
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stealthstylz
Club Retro Rides Member
Posts: 14,840
Club RR Member Number: 174
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If the cam is new use high zinc oil. As above though, don't let it idle for the first 20 minutes or so then definitely don't labour the engine when you start driving round. The Gear+0 system seems to work well, so 20mph in 2nd, 30mph in 3rd etc
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tristanh
Part of things
Routinely bewildered
Posts: 990
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Feb 25, 2018 12:53:39 GMT
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The cam previously ran,but not in this engine, it's on new lifters.
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Whether you believe you can, or you cannot, you're probably right.
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stealthstylz
Club Retro Rides Member
Posts: 14,840
Club RR Member Number: 174
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Use high zinc oil then.
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Feb 26, 2018 16:50:04 GMT
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Get it warm then drive it like you stole it for a few days. The quicker you force the rings to work in the better the engine in the long run.
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