When the SGV exhaust brake is applied the reverse
torque generated at the drive wheels is considerable reaching
almost the same horse power as the motor will develop normally . This means that
a vehicle can descent steep gradients fully loaded without recourse
to the main brakes which are kept cool for emergency use .
The breaking effect is increased as engine revolutions increase , and of course , is more
pronounced in lower gears . A vehicle can descent hills 1 - 2 gears
higher with maximum load than would be the case without an exhaust brake.
This is a good emergency factor in the event of main brake failure. Normal
brake lining life is increased by some 300-400 % because heat and fade
characteristics are not encountered .
- EFFECT ON ENGINE & TRANSMISSION -
Very detailed experiments has been carried out all over the
world and resulant findings are comparable . Without going into too
much detail of stresses and strains , the findings are as follows :
When an exhaust brake is fully applied , the pressure build - up
is generally 40/50 lbs. per sq. inch and does not exceed 70 lbs.
per sq. inch even with a petrol engine . This is considerably
less than the pressure reached in normal firing sequence .The
effect of this pressure is felt as a "cushion" on the pistons ,
connecting rod , crank shaft and bearings , which normally undergo
severe stresses .
The exhaust brake controls the revolutions , keeps
the engine at operating temperatures , and prevents any possibility
of oil dumping because of the pressure maintained on the piston .
Engine valves and valve springs are uneffected . The normal sequence
of operation occurs and the brake neither benefits nor harm the valves .
Normal engine temperatures are maintained whilst the brake is in operation .
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