Author Topic: anybody priced out a rebuild? (Read 5068 times)

nickmpower · « **on:** July 28, 2006, 03:39:37 PM »

has anyone priced out the price of a rebuild?

sheepdog · « **Reply #1 on:** July 28, 2006, 04:01:33 PM »

Quote from: nickmpower

has anyone priced out the price of a rebuild?

There is a place online that does them, It is around $3000-$3500.

BMW has remanufactured ones at around $6k (OUCH!, hate to see the price for a new one).

Most places do not want to mess with them.

nickmpower · « **Reply #2 on:** July 28, 2006, 04:09:46 PM »

well for parts, i just looked on bma and for rings, rod and main bearings, top end gasket, and some bottom gaskets and seals, and it seems to come to around $350!!! They only have the standard size rings though, and i think it would be a good idea to go out .25mm for a nice new bore?

also sheepdog, would you happen to have some pistons i could buy? how many miles?

D. Clay · « **Reply #3 on:** July 28, 2006, 05:33:29 PM »

For turning the crank, valve job, bore, etc. there's a machine shop bill. If it's all the way down, you may as well replace the chain, tensioners, guides, oil and water pumps, pistons & pins, a few gears and that low mile M44 @ $1000 starts to look good.

nickmpower · « **Reply #4 on:** July 28, 2006, 05:52:00 PM »

as far as i can tell, the timing system has very little miles on it, the water pump is new, i have a head that just had a valve job, though whether it is useable is a question. everything else has 135k on it, so i dotn know if the crank will need work.

oh and an m44 never sounds good. I was going to buy an m42 with 30k, but carfax reveiled 130k, ive been calling about one with 58k for $850, but they cant find it

2002maniac · « **Reply #5 on:** July 28, 2006, 07:32:24 PM »

Quote from: nickmpower

They only have the standard size rings though, and i think it would be a good idea to go out .25mm for a nice new bore?

You would need new pistons for an overbore. Otherwise you'll be hearing SLAPSLAPSLAPSLAPSLAPSLAPSLAPSLAPSLAPSLAP

nickmpower · « **Reply #6 on:** July 28, 2006, 07:39:04 PM »

i was just about to ask that actaully. Maybe i shoudl jsut take my stuff to the machine shop and have them check everything then decide what all i should order as far as oversized stuff, or i guess could do some if it myself, but i lack the specialty tools

sheepdog · « **Reply #7 on:** July 29, 2006, 01:49:36 AM »

Most manufacturers only count on 1-3 rebuilds/re-machining, so you are limited on bore sizes. A machine shop will be able to measure and see if you can use the smaller or larger of the sizes or if you will need the larger. It depends on wear.

At any rate, count on:
Bottom end gasket set and seals
head gasket
valve cover gasket
intake and exhaust gaskets
pistons
rings
bearings
waterpump
oil pump (yes this should be replaced on a fresh motor)
new timing chain, guides, tensioner, and sprockets ($500 easily right there), pretty much no shop will warranty it with a used timing or cooling system.
Expect some head work as well.

May want to consider some new lifters (possibly cam) and a radiator flush/cleaning. Also may want to freshen the clutch since you will have it out, maybe light flywheel, short shift kit, and of course the associated bearings plus master and slave cylinders. I would also spring for an electric fan (makes the engine bay much more roomy) and paint/clean the engine bay.

Plus a few hundred bucks for cleaning, machining and such.

nickmpower · « **Reply #8 on:** July 29, 2006, 11:05:55 AM »

an oil pump is listed for 55 bucks on real oem. The car as far as i can tell has a brand new timing setup, it has the newer style e36 gears. It also has a tensioner with a couple hundred miles, and the water pump is pretty damn new.

I got some lifters with 50k on them, and i just had the cams reground.

it seems like pistons are going to be the biggest cost of it all. I could do s50 pistons, but then it just costs more to have them machined to fit. though on real oem the pistons are listed as 212 each. The m44 pistons are a little bigger, but i think they would lower compression since the m44 crank has a longer stroke?

Ive alread installed the m20 pinion in my starter, and have the m20 clutch in my room, i ordered an electric fan off ebay a week ago

M42boy · « **Reply #9 on:** July 30, 2006, 11:49:06 AM »

I keep hearing that the secret to more power on the M42 is bumping the displacement of the motor out via overbore and using S52 pistons. If I were looking at a full rebuild, I'd definately be looking into that more.

sheepdog · « **Reply #10 on:** July 30, 2006, 01:31:51 PM »

Quote from: M42boy

I keep hearing that the secret to more power on the M42 is bumping the displacement of the motor out via overbore and using S52 pistons. If I were looking at a full rebuild, I'd definately be looking into that more.

After seeing Febi's motor, and what was done to it, stroking is certainly a good way to get the power, however, I suspect that the cam and head is where the real power lies.

Reason being is that stock the motor makes far less than 100 hp per liter. However, Sam's does. That does not change with the stroke or bore. So with proper porting and a proper cam and chip, we should be able to come pretty close to 180hp. Due to some special things I would say 170 or so is doable since we do not have the coatings or the 8000 redline (I would not go above 7200 on stock parts i.e. lifters). I suspect the cam/redline is where most of the power lies, being as how the engine can flow enough for the 2.1 @8k with porting.