Rebuild m44 for boost I'm trying to decide what I want to do with my 318ti. In stuck between swapping in a m52 or rebuilding the m44 for boost. I would prefer to rebuild the m44. Say if I go this route, assuming everything is in ok shape, am I missing anything for a complete rebuild? Rod bearings Main bearings Rods Pistons Head work Head bolts Head gasket Gasket kit Cooling system Chains Chain tensioner Chain guides Machine shop work Engine mounts Misc, hoses such as radiator Am I missing anything crutial here? |
List looks good but maybe an oil pump, water pump, all freeze plugs, some of the items dont need replacement like rods, etc. How many miles on motor and what is your HP or Boost goal? Answer this and I can help you better with your project. |
What are stock Rods rated for? 200,000 miles, low compression on cylinder 2&3. Wild like around 250-300 to the wheels and no more than 15-20psi on 8:5:1 Pistons if possible. I've read your build thread multiple times but still unsure about the turbo you chose and it what kind of power you were making at 15-20 psi. This is my first turbo project if I choose to go this route and will most likely custom make a manifold for a top mount. Also about tuning, midnight tuning can flash stock DME? |
Ive put 250hp to them on 15psi boost for 70K miles. I think 300hp is pushing it but mit might do it if you keep the RPM's down. I think to make 300hp the pistons will need to be changed to a lower compression ratio and forged or hyperkinect(sp?) There were 2 of us that ran 250hp all day long for many miles, never a issue Barrie @ Mid-night can tune the car. John S |
I more than likely have a bore/prison/ring issue that causing my low compression so CP 8:5:1 are on the shopping list, along with a set of forged rods if needed |
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Here is an idea of 17psi pump 93 octane no meth spray https://www.youtube.com/watch?v=1FIM8sBtjss |
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Also, what's the deal with the m3/328 MAF sensor? |
Oil will also "fix" the low compression in the gasket as well if its not blown all the way. Leakdown is your friend compression tests are pretty low info. Pump each cylinder up and see if you have bubbles.. |
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I wasn't sure if it would seal a head gasket leak like that, but i do know it ran good for about 5 second until the oil burned up ha. Regardless it will need to be rebuild from the bottom up if I'm going to boost it. Just gotta wait for it to warm up a little bit up here in Vermont. Should I be going forged rods just for the peace of mind? |
Johns got the most time on boost.. :D I've never built a engine and regretted the forged rods, I have built one without and regretted it.. It depends on the quality you start with. To control the cost where you want it, you have to pick a HP number and stick to it.. Otherwise mission creep will blow it. Mag/xray any parts you install even if they are new. Assembly is half of making strength and power, and in the big scheme the labor cost is not the gorilla in the cost. Building engine take practice at high power levels, make sure you have a good mentor on the re-assembly. It cost me about 800 bucks for machine work and assembly on my jeep and 1K in parts.. It spins nicely to 7000 and for a rocker arm motor that had a 5000 rpm factory red line I'm happy with it. I got a b&b of all the moving parts and we did a mild job on the head, 5 cut valve job and a little basic port work. stock rods, magged and shot peened, Clay smith cam, stock valves, Hyperutecktic Pistons, Heavy valve springs and upgraded lifters, high pressure std volume pump. Cheers. |
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328 or M3 1995 only will plug into your current MAF wiring and it allows 3" of air flow instead of the stock MAF at 2.5" You will peg a stock 2.5" around 8-10 psi of boost and then the tune goes to $hit unless you Barrie to work some magic to ignore a Pegged MAF. BTW something is wrong in the motor so head has to come off. Also I think all M4x rods are forged it's just the M42 has a forged crank and the M44 is cast. John S |
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I think for now I'm going to swap in another m44 find out what else may be wrong with the car and take my time building the motor and turbo setup. Didn't you say you replaced the seals in the turbo as well? A guy I work with has about 12k on his eBay turbo and has had good luck. What did you do with your washer fluid resivour? I would like to make a custom manifold and shove the turbo in that area or where the battery is and relocate it to the trunk. |
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Never replaced a turbo seal 37K on the turbo all is good. I did a bottom mount so I never had to move anything, my battery was factory installed in the back. Maybe you could try the OBX manifold unsidedown for a top mount? |
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