Hello, so I recently came across an M20 from a 525i with about 100k miles on it. I'm getting a pretty good deal, so I think I'm going to buy it along with a transmission and diff. and swap it into my 318is. While I still have the engine out, I plan on changing the timing belt and maybe a headgasket kit. What else should I consider doing to refresh it for a long, healthy life while I still have it out? I've not got a huge budget, but I may be able to toss a couple performance parts on, but I'm mostly hoping for longevity.
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While my engine is out, what should I do to it?
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Does the m20b25 from 525i mount differently to the m20b25 from an e30? I know there are differences but they escape me at the moment.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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i recall something about dipstick and engine mount differences, but as long as the block mounting holes are the same and its just the brakcets that are modified then it should not be a problemLast edited by digger; 04-17-2017, 11:04 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Not sure about your situation, but those 318is are going up in value quicker than any other non M e30. If it were me, I would keep that M42 in there and get a cheap 325e to swap the m20b25 into... I think you will be devaluing you car by doing this swap - if the car is in ok condition.
I know you didnt ask for it, but that is just my .02.
Edit: But yes I would pull the caps on the rods to check bearings at least and do all the gaskets and any vacuum lines.. Once that rear main goes - its a pain in the arse
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Sent from my SM-G935V using TapatalkLast edited by peterman; 04-19-2017, 03:40 PM.
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Personally. Would do all gaskets and the bearings.
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Originally posted by peterman View PostNot sure about your situation, but those 318is are going up in value quicker than any other non M e30.
OP...
I'm assuming you are also swapping out the idler pulley and water pump with that timing belt? You are also going to want to do a simple valve-lash adjustment.
Beyond that, I see good arguments for both leaving it alone..or replacing bearings,etc. Your call.
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Keep the 318is a 318is, or put something much greater in it's place. All you're doing is driving down the value of the car.
You can probably sell it or trade it directly for a 325 car in as good or better shapeDrive it hard. Maintain it well.
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Originally posted by mr2peak View PostKeep the 318is a 318is, or put something much greater in it's place. All you're doing is driving down the value of the car.
You can probably sell it or trade it directly for a 325 car in as good or better shape
Agree, keep it a 318.1991 325i 4 dr Euro Spec, 5 Speed, 4.10 LSD, Slicktop
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