Just a fyi, there is a very real reason for the hypoid description in gear oil. Has to do with shearing the oil. Hypoid gears put tremendous sliding loads across the faces of the teeth, tearing oils up. To handle this tremendous load, the oils are modified with things like Zinc, Sulphur and such. While these special hypoid additives greatly help the oil survive, they tend to be corrosive to soft metals like brass and copper. So you need to be careful which you use. There is a correlation between the GL specifications and hypoid suitability, but I don't remember the exacts of it.
As another fyi, the overdrive clutch is perfectly capable of handling all the power a Spitfire engine can give it. The problem is the hydraulic pump is driven by the output shaft, and needs to be spun up enough to build up suitable pressure to properly hold the clutch. The vehicle speed in 1st and 2nd gear is not high enough to have the output shaft spinning adequate rpms for building pressure. So the problem isn't with the power of the engine, it's with the rpms of the output shaft. There are some modifications that can be done to better build pressure, allowing 2nd gear usage, as well as external oil pumps to allow 1st gear usage. But for a Spitfire application, they are rather silly. >>> Richard Gosling <[EMAIL PROTECTED]> 04/05/02 10:14AM >>> Gear oil labelled 'Hypoid' (a fairly meaningless term, as this just refers to gears that are cut at an angle rather than parallel to the shaft, so I can't see it's relevance to oil specs) ... /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
