Hi
At this moment I am building an M20 stroker with following setup:
bottom:
- original m20b25 housing
- crank M52B28
- forged 135mm H beam rods
- forged mahle pistons bore 85mm with CR 10 to 1
- RHD flywheel 3,3kg
this is fully balanced
top:
- lightweight Schrick race valves, standard size
- catcams stronger and shotpeened rocker arms
- catcams double valve springs
- catcams lightweight spring seats
- new ported 885 head
- camshaft: catcams 285 or schrick 288 (not decided yet)
inlet: RHD ITB setup 40mm
exhaust: Hartge headers / Hartge middle muffler without catalyst / Eisenmann race end muffler
software: full KMS setup incl all sensors, wires, 2 lambda controllers, 300cc injectors, 4 bar fuel pressure regulator etc etc (you can compare it with Link ecu)
gear box: rebuilt but original getrag 260
differential: 60% LSD ratio 4.10 (which is to short, I will pas to 3.91 or 3.73, ratio will be decided when engine is running and engine character is known)
I am having 3 questions:
- Initally, my car was an M20B20. Will this fuel pump will be efficient enough, knowing I will have a 4 bar fuel pressure regulator?
I thought M20B25 cars and M3's have 2 fuel pumps, one in the fuel tank and one external. As mine was a B20, I only have a fuel pump in my fuel tank.
- I have a Catcams 285 camshaft in my possession which drove +- 20k miles. Or I will use this or I will use a new Schrick 288. Any guys who have experience with this? Car will be used for weekend, fun drives and occasional track. I d rather stay save and set my limiter at 7000rpm.
- Running and LSD with ratio 4.10. I will use this to break in my engine and got familiar with the motor character, as I have no idea which power figure and band I will have. However when I drove the 4.10 with the initial B25 engine, I already decided it was to short. What do you guys think, 3.91, maybe a 3.73.. I do not often use the highway. I use the car for mountain driving and occasionally Nordschleife rounds. (I live in Belgium)
Want to upload some pictures but it doesn't work.
Regards,
At this moment I am building an M20 stroker with following setup:
bottom:
- original m20b25 housing
- crank M52B28
- forged 135mm H beam rods
- forged mahle pistons bore 85mm with CR 10 to 1
- RHD flywheel 3,3kg
this is fully balanced
top:
- lightweight Schrick race valves, standard size
- catcams stronger and shotpeened rocker arms
- catcams double valve springs
- catcams lightweight spring seats
- new ported 885 head
- camshaft: catcams 285 or schrick 288 (not decided yet)
inlet: RHD ITB setup 40mm
exhaust: Hartge headers / Hartge middle muffler without catalyst / Eisenmann race end muffler
software: full KMS setup incl all sensors, wires, 2 lambda controllers, 300cc injectors, 4 bar fuel pressure regulator etc etc (you can compare it with Link ecu)
gear box: rebuilt but original getrag 260
differential: 60% LSD ratio 4.10 (which is to short, I will pas to 3.91 or 3.73, ratio will be decided when engine is running and engine character is known)
I am having 3 questions:
- Initally, my car was an M20B20. Will this fuel pump will be efficient enough, knowing I will have a 4 bar fuel pressure regulator?
I thought M20B25 cars and M3's have 2 fuel pumps, one in the fuel tank and one external. As mine was a B20, I only have a fuel pump in my fuel tank.
- I have a Catcams 285 camshaft in my possession which drove +- 20k miles. Or I will use this or I will use a new Schrick 288. Any guys who have experience with this? Car will be used for weekend, fun drives and occasional track. I d rather stay save and set my limiter at 7000rpm.
- Running and LSD with ratio 4.10. I will use this to break in my engine and got familiar with the motor character, as I have no idea which power figure and band I will have. However when I drove the 4.10 with the initial B25 engine, I already decided it was to short. What do you guys think, 3.91, maybe a 3.73.. I do not often use the highway. I use the car for mountain driving and occasionally Nordschleife rounds. (I live in Belgium)
Want to upload some pictures but it doesn't work.
Regards,
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