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 Estrella Technik
Maybug Offline

Neuling


Beiträge: 10

15.12.2021 10:16
New Member Antworten
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|I have recently purchased a 1995 Estrella, an import from Japan it is in good condition and I am enjoying it.
I also bought a spare engine that was on ebay. I have started rebuilding this engine. I have noticed the following problems:
1 Camchain wear
2 severe wear on camshaft itself
3 severe wear on both rockers
I noticed that the valve springs seem very strong?? (I also own a 1934 6cyl Wolseley with a 1600cc OHC Each bore works out at 266cc. so about the same as Estrella but the springs are about half the strength).
Could this be a reason why the Estrella suffers from excessive problems with wear in the valve train?

Scharlachdorn Offline

Racetrellist


Beiträge: 726

15.12.2021 12:28
#2 RE: New Member Antworten

The reason for the cam / rocker arm wear is the following:

• non-ideal material pairing for given load/ lift acceleration (arm should get hard block)
• too low or zero oil pressure at speeds below 3000/4000 rpm with hot / thin oil
• if clearance is too high wear increases rapidly (if too small exhaust valve prone to failure)
• spring needs to be so strong due to accel loads induced by profile type

Regards

SD Engineering

Maybug Offline

Neuling


Beiträge: 10

15.12.2021 13:26
#3 RE: New Member Antworten

Many thanks, would you therefore advise the use of fully synthetic oil? cheers, Geoff

Scharlachdorn Offline

Racetrellist


Beiträge: 726

15.12.2021 14:28
#4 RE: New Member Antworten

Use modern oil with highest viscosity you can get. I.e. 20W-50 oder 10W-60.

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