Ultimate dilavar upgrade

[jcge]

File this with your list of upgrades for your engine...

I learned today that Porsche (Ferdinand Piech) patented a timing chain made from Dilivar

(ref US Patent 3707092, circa 1972)
"With reference to FIG. 2, the drive chain 1 consists of individual, movably assembled chain members 13 consisting of rollers 14 supported on bearing bolts 15. The bearing bolts are held on both sides thereof by connecting straps 16 consisting of a material having a high manganese and nickel content and thus an especially good temperature-expansion coefficient. Such a content is similar to the material known as "Dilavar Ni 13."

During operation of the internal combustion engine 4, the chain housing 3 expands due to hearing and the distance a between the axes of the camshaft 2 and crankshaft 6 is increased. The drive chain 1 is thereby tensioned by the mount of expansion of the chain housing 3 so as to change the timing of the camshaft 2. In order to prevent breaking of the drive chain 1 as well as the avoidance of high bearing loads on the crankshaft 6 or the camshaft 2, it becomes the task of the chain tensioning device 8 to equalize the expansion of the chain housing 3. By this means, however, the chain pretension of the drive chain 1 is increased, thereby resulting in a higher loading of the drive chain 1. Through the selection of the material for the connecting side straps 16, a nearly equal expansion of the drive chain 1 can be attained. The chain housing 3 which consists of a magnesium alloy has a temperature-expansion coefficient of approximately 26x10^-6 m/m/°C and the material for the connecting side straps 16 has a temperature-expansion coefficient of about 21x10^-6 m/m/°C. Due to this, the drive chain 1 will expand by nearly the same amount as the chain housing 3, so that the predetermined chain tension and the control timing of the internal combustion engine are maintained relatively constant. In the arrangement of the present invention, the chain tensioning device 8 serves only as an oscillation damper and for the retention of the original chain tension."


It's my uinderstanding that a patent requires an element of "novelty"...and I think this might just qualify.

And you thought this was going to be just another Dilavar head stud thread...

[jcge]

[356RS]

Great information on the 901 engine history. Where do you find this stuff John?

[jcge]

There's loads of great stuff at the Patent Office.

Haven't you always wondered how to weld together your composite 917 crankshaft with an electron beam welder....???