Quote:
Originally Posted by proffighter
That's a classic tuning procedure (boattailing) to relieve gas exchange or breathing between the cylinders and the crankcase (volume below the piston). According Bruce Anderson 10 more hp for a 2 liter engine. This needs also machining the crankcase like this which correspond (red) to the slots in the cylinders:
I do not have seen any dyno to proof, but because I don't see any downside except the work it's worth a try
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Thank you Roland for the illustration!
I have picture from the Bruce Anderson Book (German Version from Roland)
This modification was made at all the factory 2 liter racing engines.
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87 930 3.4, BW EFR 7670, TK Long Neck IC, Fabspeed Headers, 964 NW`s, Ported Heads, Tial F46 (0.4Bar Spring), Turbosmart EBC, BL WUR with rpm switch /solenoid, SDS CPI Ignition, modified Muffler, and many other little mods
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