Porsche 928 flexplate clamp on stock now!
The great V8 engine of your 928 can be completely destroyed if you do not address this problem. This is called the flexplate problem.
The flexplate problem causes the crankshaft to be pushed forward, causing the axial crankshaft bearings to wear quickly and eventually the crankshaft and the lower block are written off. The crankshaft is essentially drilling through the engine block. It is a matter of only 3 to 5 mm, but that is what happens.
There have been many designs and very beautiful products made for this. We focused on pure functionality and came to the conclusion that all other designs make 1 mistake. A clamp is made of two halves on an axle that consists of three segments. The pressure on the three segments is then never the same on the three segments. A simple vector force calculation shows that. The original Porsche clamp was also designed with a single bolt and two segments.
The clamp we designed is also relatively small so that the weight remains small. This keeps the centripetal forces that pull the clamp apart smaller.
This new clamp is made of 3 circle parts that fit perfectly around the original flexplate coupling sleeve. We use 3x M8 high strength 12.9 allen bolts to tighten the clamp to 40Nm. With this new clamp the problem disappears completely. It holds the driveshaft as the Porsche engineers intended.
Below is a photo of the average 928 automatic, before and after loosening the original clamp. You can see (with difficulty) that the visible part of the splines is getting shorter. The clamp has therefore shifted slightly due to the loosening of the bolt.
In our opinion, we have managed to realize the best solution for the lowest price. Assembly is quite simple, you can wait for it with us. For models up to 86 it can be done in about 2 hours. For later models, the exhaust must first be disassembled.
Suitable for all 928 models
Porsche 928, 928S, 928S4, GT, GTS
Reference number:
92242125500, 92211604103
Tags:
Flexplate problem, porsche 928 engine problem, wear, torque tube