Wednesday, December 3, 2008

Pre Crossflow power for the GT.

Wow, it's been awhile since the last post. Time has certainly flown by. Over the summer, I decided to build up a fresh engine for the MK1 GT. It currently has a crossflow but I wanted to return the car back to pre-crossflow power. I have a always like the pre-crossflow engines. They seem to rev quicker than the crossflow. Ultimately, the crossflow will produce more power but that was not the goal. Additionally, the pre-crossflow engine is correct for the car.
I started with a good used a pre crossflow block from my inventory and had it bored to 83.5mm. The block also required decking to restore the surface. Once the bore and hone was completed, the
block was check ultra sonicly to make sure there were no thin spots. Everything check out fine.

The plan was to install forged 83.5 mm pistons along with Lotus rods, a standard lipseal crankshaft and a camshaft that would be compatible with both the original 2 barrel downdraft Weber or twin 40mm Weber DCOE's. Cylinder head modifications planned included upgraded springs and a miled port job. The combustion chamber was re-shaped as per classic tuning practice. I also polished the crankshaft to restore the surface. -More to follow-