Quote:
Originally Posted by Iyzmi
Quote:
Originally Posted by Nugget
One good point about the Harrop kit is that the belt is in line with the stock belts.
This is what I was told about other kits
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That info is not necessarily wrong, but Harrop is the only kit that doesn't put the supercharger pulley in front of the crank pulley so naturally they would say this to sell more of their own kits. Centrifugal supercharger kits for this platform have been around for almost a decade and installed on thousands of cars. While there have been examples of main bearing failures, the reality is that they are few and far between and certainly much more rare than rod bearings failures. To say every type of supercharger other than Harrop is destined for main bearing failure is quite an exaggeration (or a sales pitch) IMO.
In terms of reliability, one can make the argument that the low end torque produced by the Harrop kit is more detrimental to the engine's health than the added load on the main bearings from a centri kit. I would expect accelerated rod bearing wear from the Harrop kit relative to a centri kit from the stress at low RPM, though that's speculative at this point.
With that said, I don't think any kit is more reliable than the other and anyone who supercharges an S65 should accept the calculated risk they are taking. It's worth it. |
You guys are going to think I'm nuts but I actually think a supercharger belt would help balance out the forces on the main bearings. Back of a napkin force diagram would show a bunch of rods pushing down and some belts pulling up...totally discounting whatever pulling the rods are doing at higher speeds throwing a piston around...its certainly way more complicated....
Boxer engines are known to be easier on their mains because of the balance right?....