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Original Message
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| RE: virgin 428...oil pressure is 50 during cranking... |
| By John - 05/01/2001 10:03:43 PM; IP 142.177.63.37 |
| First, 50psi sounds right for cranking, 70 to 80 psi with engine running is good. Cold oil is like molasses...thick and builds pressure...expect 20 to 25 psi at idle with engine hot. As for the Melling pump, the real experts say a HV pump is not necessary for a street engine, but I like a little insurance...just in case the pump can't build oil pressure to match the rate the engine is accelerating with respect to rpm...you get a head start with the 57MV. As far as using no muflers for start-up...not a problem...won't even be noisy unless you rev it, which you shouldn't do until it's broke in...either let it run at 1500 to 2000 to seat rings and lifters for 20 minutes, or get it out and drive it...not high rpms, but with a load on it for a bit...changing mph constantly. As far as the mufflers go, not using them won't hurt a thing. Again, the story about lack of back pressure hurting anything is hogwash. An engine is an air pump..more airflow...more horsepower..that's it, nothing else. I ran my 66 Mustang 289 with just the Y pipe for a check-out...quite quiet actually...but would have been noisy on the road under load. Take it easy and change the oil frequently until you hit about 1000 miles...then you can give it ...er...hmmm..."hell" as they say. From comments about problems I've had...use 10W30 mineral oil for break-in, then switch to 5W50 synthetic after that, unless you live in a perpetually warm climate, where 10W40 mineral oil seems to be OK. |
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