Quote:
Originally Posted by Nukar sales
A 2.5 vw built properly is very relatable engine these days not like 20 years ago the market is full of after market vendors cases,cranks ,rods, heads, and just about anything else I bet your engine makes more h.p. than a 2.7 and it's half the weight. I,m not a big fan of vw,s don,t get me wrong it's just the truth. Nice car though,lee.
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High powered VW may be OK in a drag race but they fundamentally don’t have the cooling capacity to be used for any length of time. It’s basic physics — internal combustion is a heat pump. At theoretical peak efficiency, 30% of the fuel energy is converted to useful mechanical energy to the crank, 30% to heating the exhaust, and 30% must be dissipated through the cooling system.
A Porsche flat-6 has nikasil cylinders — about five times the heat transfer of cast iron. Plus their cylinder surf area is about double that of a VW. Porsche heads have about 3 times the cooling area as VW heads. Even with all this, Porsche still determined that it needed oil cooling via a front radiator.
Internally, Porsche engines are rock solid with a 7 main bearings crank, whereas VW has a floppy as a noodle 3 main bearing crank (the front doesn’t count).
Porsche engines are designed for performance and reliability, whereas VW engines were designed to be cheap to make, and easy to maintain with minimal tools. Completely different engineering goals.
The point is modified, high powered VW simply can’t last very long, unlike a Porsche engine.
If you keep that in mind, just drive it until it the engine detonates, then get another. That’s the advantage of a VW, they’re cheap and easy to build.
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