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Look into exhaust port. All ports are ported and modified.
Originally the port is round, but as you can see, the port is now oval, matched with the exhaust gasket.
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Look into intake port. All intake ports are ported and modified. The "splitter" in the middle is sharp now.
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Here you see the intake gasket on the intake.
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Close up of the gasket. This gasket had to be modified, at the bottom, for optimal air flow between T-Vis and intake.
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The "quench areas" are removed, so the combustion chamber is enlarged. Together with the lower compression ST205 piston, and the TTE 1.4 mm headgasket, compression should be dramatically be reduced. Surprisingly cc-ing the combustion chamber showed me that the new combustion space is exact 66.2 cc. This is exactly the same for every cilinder, of course.
Now a little math:
0.25*Pi*bore²*stroke = displacement.
0.25*Pi*86.5² mm piston* 86 mm = 505.383 cc.
Displacement+combustion chamber/combustion chamber=compression ratio.
505.383 + 66.2 / 66.2 = 8.63418 compression ratio.
The water passages are drilled bigger, for better coolant flow.
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All valves are balanced and modified for optimal air flow.
Intake valve = 45.8 gram
Exhaust valve = 38.7 gram
For example, the three new intake valves I needed were: 47.3 gram, 47.8 gram and 48.1 gram.
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A pic of a new rod on the weigh machine.
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Pic of the rod cap.
| New conrods, with piston pin bushing, without bearings and bolts, before and after balancing: |
| | before | before | Total | after | after | Total | |
| 1 | 543.6 | 190.4 | 734.0 | 541.0 | 183.3 | 724.3 | gram |
| 2 | 543.5 | 185.9 | 729.4 | 541.0 | 183.3 | 724.3 | gram |
| 3 | 542.4 | 186.0 | 728.4 | 541.0 | 183.3 | 724.3 | gram |
| 4 | 543.3 | 183.3 | 726.6 | 541.0 | 183.3 | 724.3 | gram |
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As you can see those new rods are +/- 39 gram less heavy than the old ones (below). That is because they are of a much better material as the old ones. Better, lighter and stronger. Unfortunately, out of the box they are not well balanced....
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| Old connecting rods, with bearings, before balancing: |
| 1 | 806.6 | gram |
| 2 | 806.2 | gram |
| 3 | 805.7 | gram |
| 4 | 807.8 | gram |
| Old conrods, with piston pin bushing, without bearings and bolts, balanced: |
| 1 | 763.4 | gram |
| 2 | 763.4 | gram |
| 3 | 763.3 | gram |
| 4 | 763.2 | gram |
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Some other pics can be found on my mirror site (if still up???):
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