Hi Guys.
I’m new to the site, but have been doing some homework with regards to M20 stroker builds, I think this Forum looks very good and is full of knowledge.
I have an E30 Track car, pretty well sorted as far as handling is concerned, I built an M20 last year with a basic ish spec. (more of a fast road engine than a track engine) engine is good and strong Dyno’d to good numbers.
However the quest for more power continues. I am now going to build a 2.8 stroker. And plan on the following spec.
In an Ideal world we would be making somewhere between 230 and 240bhp, but appreciate that numbers aren’t everything and I’m encouraged by the torque of the 2.8.
Current Planned spec is the following:
• M25b25 block
• M50/M52 crank
• M20B20 Standard rods (balanced and with ARP bolts)
• M20 325i Stock pistons.
• 288 Kent Cam kit (will include valve springs, followers etc)
• Cam Vernier
• Aftermarket management (Currently running Canems ECU)
• Upgraded injectors (Currently running either 190 or 210cc, but was planning to go bigger if required)
• Individual throttle Bodies.
• Obviously engine will be thoroughly cleaned, De-Coked, new shells fitted, oil pump etc.
Yet to start stripping the new donor engine but already have a couple of questions:
Does the above setup sound sensible?
I believe the block will need decking with this setup.(probably look around 10.5:1 comp) And possible machining to piston skirt for clearance, the spacer is also needed for the front of the crank. Is there any other machining required?
What sort of power can we go to with standard m20b20 rods?
Is the head going to be a major restricting factor if maintaining standard size valves?
Look forward to hearing your responses.
Thanks Guys.
I’m new to the site, but have been doing some homework with regards to M20 stroker builds, I think this Forum looks very good and is full of knowledge.
I have an E30 Track car, pretty well sorted as far as handling is concerned, I built an M20 last year with a basic ish spec. (more of a fast road engine than a track engine) engine is good and strong Dyno’d to good numbers.
However the quest for more power continues. I am now going to build a 2.8 stroker. And plan on the following spec.
In an Ideal world we would be making somewhere between 230 and 240bhp, but appreciate that numbers aren’t everything and I’m encouraged by the torque of the 2.8.
Current Planned spec is the following:
• M25b25 block
• M50/M52 crank
• M20B20 Standard rods (balanced and with ARP bolts)
• M20 325i Stock pistons.
• 288 Kent Cam kit (will include valve springs, followers etc)
• Cam Vernier
• Aftermarket management (Currently running Canems ECU)
• Upgraded injectors (Currently running either 190 or 210cc, but was planning to go bigger if required)
• Individual throttle Bodies.
• Obviously engine will be thoroughly cleaned, De-Coked, new shells fitted, oil pump etc.
Yet to start stripping the new donor engine but already have a couple of questions:
Does the above setup sound sensible?
I believe the block will need decking with this setup.(probably look around 10.5:1 comp) And possible machining to piston skirt for clearance, the spacer is also needed for the front of the crank. Is there any other machining required?
What sort of power can we go to with standard m20b20 rods?
Is the head going to be a major restricting factor if maintaining standard size valves?
Look forward to hearing your responses.
Thanks Guys.
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