Wused to have a rule of thumb about type I engines lasting say 80K miles between rebuilds. I remember someone got 300K out of his type-1 by changing the oil every 1K miles. Is there any rule of thumbs to go by for the type 4? Another rule of thumb was that a modified engine with higher compression would last even less.
The main thing that limits life spans of the engines is misconfiguration..AND IMPROPER TUNING! Most engines are neer optimized!
I don't believe in running things into the ground, so at 40K, you spend 500 bucks on a valve job, and at 80K you do the same thing.. Then at 120K you rebuild it....
I have many 145BHP engines with over 120K on them, hell I have 60K on the one in my 912 and I built it out of used parts!
Done right, the engine will last as long as the car will- done wrong it won't last two weeks.
I have seen lots of 2.0l and 1.7 motors last well into the 145k range with proper maintanance.
Of course, I have seen oem motors blow up at 60k too without oil changes.
Geoff
I have a 74 1.8 that has never been opened up with 125k on it. It's getting pretty weak, but runs fine.
ahh - this gives me hope. I have a 1.7 that has 89k on it but had been sitting for a few years. I'm in the process of updating the essentials and hope to try and fire it up by the end of Aug. I would be nice to get some use out of it before having to tear it all down.....we'll see.
a 1700 gets started at 100K, I have seen them go 250!
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