Originally Posted by xbgs351
It is not uncommon to get a noticeable increase in horsepower after fitting one of Johns pumps.
Another idea of his involves relocating the thermostat to the bottom hose. This controls the temperature of the water going into the motor and stops the front cylinders running colder and at more erratic temperatures than the other cylinders.
This does work especially well for a Clevo. Have you ever noticed when you've pulled your motor for a rebuild that the back cylinder bores are nearly always 1 or even 2 thou more worn than the front bores. This is the result of poor water circulation / cooling in these ALL iron Block/head combos. The heat just can't be dissipated effectively enough and the back bores expand and contract on a much more disproportionate level to the front.
Of course this becomes more prevalent over time and I've seen it first hand on my Clevo that had done approx 60,000Klm since the last rebuild.
If your temp gauge shows hot, imagine what the actual water temp in the back cylinders is !!!!!!!!!!!!!!!!
Most temp probes are right up the front of the block where the water enters from the rad.
John's system and logic is much more ideal, but much more expensive and hence a less attarctive proposition considering that a well serviced cooling system will do an adequate job 90% of the time.
The key is stability................temp fluctuation is the biggest problem. Going from cool to hot and then cool again is NOT good.