- Joined
- Aug 19, 2009
- Location
- WA
There is a 1/4 inch pipe hole in the block between cylinders 1-2. Almost a short circuit on the pump when the system is open. I aslo pull water from the back of the head on the intake side.
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Welcome Kay, your english isn't that bad.
If you've got any information on the harmonics issue, that would be very interesting to see! Most of the crew here won't have access to the test equipment you mention, so I'm sure seeing what you may have available would be awesome!
Hello, nono, this is not my equipment, for bad luck.
I was a student and did practise at Porsche in the beginning of the 80's as a "work-student"
This problem of vibrations is only on 4cyl high running turbo charged engines.
We(they) destroyed nearby everything on the dyno.
At this time the computers were slow, no digicams etc.
The core plugs were welded for shure. We lost on the racetrack the part of engine case where the year and month of cast is noticed.
On dyno with hologram and strobo you could see this thing moving!!!! and shaking. Grind it away and problem solved, strange thing.I did have a workshop for historic race cars and restoration, a lot of tools are still with me. Hard to find things too, like ignition distributor test stands (4x) Bosch and 3 Souriau. A huge improvement on race cars you can do by modifying the ignition.
Back to the article:
You have mass-forces in 1. and 2. grade in engines. 1. is all the moving parts without combustion etc. 2. is with combustion and firing up, the running and power producing engine.
The 2. grade forces on turbo powered 4cyl are amazing and really difficult to handle.
I try to find informations in my documents. The way we fixed it is not in my head anymore, too long time ago.
cheers, Kay
I'm going to chime in a bit here.
1. In any motor we build we only use stock VOLVO freeze plugs. Early on I used dorman and other aftermarket stuff and they would seemingly push out. Started using volvo stuff and have yet to have one come out. All that to say we stock volvo factory freeze plugs now and its all we use.
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