Howdy fellow r3vers,
I had a few questions about building a 2.8L M20 stroker. I've done my research, but all the info out there is so different from each other, that I decided to start a new thread in hopes of finding a more simple answer, specifically for application.
First of all, a little run though of my car. So in June of this year, I decided my slushbox and stock m20 did not cut it anymore, so I decided on going 5 speed and a turbo. While searching for parts for the build, I came across a local guy selling a 2.7i turbo M20 with the G260, MS2 and most of the other parts that I would have to buy either way. I bit the bullet and bought the whole shebang. I gave the whole thing to my mechanic to install and a few weeks later, I got the car back and 4 days after driving it, the head blew on the way to the E30 picnic (about a 2-hour drive for me). The head blew because I had to drive the car 2 days on the base tune and it detonated like motherf****r, so the damage was already done, yet I didn't realize this until I brought my car back home. So basically, I dropped the car off again for a head rebuild and I did some other bits and bobs too (Podi gauge, wideband, electric fan, 75* thermostat, Mishimoto rad, IE HD rockers, Walboro 255lph, etc).
4 months passed and I finally got the car back, and now it was time for another dyno session. I dropped it off as soon as I got the car back from my mechanic (towed it instead of driving it, to be safe). My tuner phones me later that day saying my wastegate was screwed up, but other than the boost leak, the car was running good and drivable. So I ordered a new wastegate (Tial 38mm) and booked the car in for dyno a week later. So, I drop off the car off along with a new wastegate, ready for the final tune (and btw I was only at 11psi on an oringed block, ARPs, and low compression OEM gasket when the head blew and same for the new tune) but on the day I was supposed to get the car back, my tuner phones me saying that as he was finishing up the tune, some loud knock starting happening. I towed the car back to my mechanic, where we discovered a wrist pin let go.
I now need a block rebuild and I really just want to be done with this thing once and for all. While researching on the rebuild, I decided I might as well go 2.8L. Here are the parts I think I want to use:
-M52B28 Forged Crank (84mm stroke)
-Eagle 135mm Rods
-JE Forged Pistons (84.5mm or 85mm bore?)
-Some nice coated main and rod bearings
-Crank spacer thing (necessary?)
Now for my questions:
-With this combo, what compression pistons do I need to buy for an overall CR of 8.5:1?
-Will 135mm rods even work? People say they do, but I always hear of people running 130mm.
-I am going for a reliable yet powerful build. Will these parts cut it and is going stroker even a good idea? I plan to run about 12 psi as a daily driver map, but up to 22psi once in the blue moon when I want some extra fun.
-I talked to Mourad at VAC, he says a cutting ring gasket is the way to go, but my block is oringed. Will it work or do I need a new block?
-Should I go with 84.5mm or 85mm bore? Will 85mm be pushing it a little bit if I want to go for longevity?
-What's the deal with the crank spacer thing?
-What would be a safe rev limit for this stroker?
I hope you guys can help and give me some good advice. My head is spinning right now trying to plan this whole thing, and in the back of my head something keeps telling me this won't be reliable despite the quality parts. Any input is valued, and for sure, go ahead and add any extra comments or observations!
Thanks,
Marcus
I had a few questions about building a 2.8L M20 stroker. I've done my research, but all the info out there is so different from each other, that I decided to start a new thread in hopes of finding a more simple answer, specifically for application.
First of all, a little run though of my car. So in June of this year, I decided my slushbox and stock m20 did not cut it anymore, so I decided on going 5 speed and a turbo. While searching for parts for the build, I came across a local guy selling a 2.7i turbo M20 with the G260, MS2 and most of the other parts that I would have to buy either way. I bit the bullet and bought the whole shebang. I gave the whole thing to my mechanic to install and a few weeks later, I got the car back and 4 days after driving it, the head blew on the way to the E30 picnic (about a 2-hour drive for me). The head blew because I had to drive the car 2 days on the base tune and it detonated like motherf****r, so the damage was already done, yet I didn't realize this until I brought my car back home. So basically, I dropped the car off again for a head rebuild and I did some other bits and bobs too (Podi gauge, wideband, electric fan, 75* thermostat, Mishimoto rad, IE HD rockers, Walboro 255lph, etc).
4 months passed and I finally got the car back, and now it was time for another dyno session. I dropped it off as soon as I got the car back from my mechanic (towed it instead of driving it, to be safe). My tuner phones me later that day saying my wastegate was screwed up, but other than the boost leak, the car was running good and drivable. So I ordered a new wastegate (Tial 38mm) and booked the car in for dyno a week later. So, I drop off the car off along with a new wastegate, ready for the final tune (and btw I was only at 11psi on an oringed block, ARPs, and low compression OEM gasket when the head blew and same for the new tune) but on the day I was supposed to get the car back, my tuner phones me saying that as he was finishing up the tune, some loud knock starting happening. I towed the car back to my mechanic, where we discovered a wrist pin let go.
I now need a block rebuild and I really just want to be done with this thing once and for all. While researching on the rebuild, I decided I might as well go 2.8L. Here are the parts I think I want to use:
-M52B28 Forged Crank (84mm stroke)
-Eagle 135mm Rods
-JE Forged Pistons (84.5mm or 85mm bore?)
-Some nice coated main and rod bearings
-Crank spacer thing (necessary?)
Now for my questions:
-With this combo, what compression pistons do I need to buy for an overall CR of 8.5:1?
-Will 135mm rods even work? People say they do, but I always hear of people running 130mm.
-I am going for a reliable yet powerful build. Will these parts cut it and is going stroker even a good idea? I plan to run about 12 psi as a daily driver map, but up to 22psi once in the blue moon when I want some extra fun.
-I talked to Mourad at VAC, he says a cutting ring gasket is the way to go, but my block is oringed. Will it work or do I need a new block?
-Should I go with 84.5mm or 85mm bore? Will 85mm be pushing it a little bit if I want to go for longevity?
-What's the deal with the crank spacer thing?
-What would be a safe rev limit for this stroker?
I hope you guys can help and give me some good advice. My head is spinning right now trying to plan this whole thing, and in the back of my head something keeps telling me this won't be reliable despite the quality parts. Any input is valued, and for sure, go ahead and add any extra comments or observations!
Thanks,
Marcus
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