Q. What oil should I use for my Hewland Transmission?
Hewland Engineering Ltd is frequently asked to recommend oil type or oil brand for it's transmissions. It may be that in the future Hewland will have specific product advice, but this is not the case at present.
We recommend that only well known brand name gear oils be used. A leading oil company advises us that conventional oils contain 'too many' additives for the utmost transmission efficiency, but will almost always lubricate well. Therefore, conventional gearbox oil from one of the leading brand names is almost certain to lubricate very well indeed. It may be at the cost of inefficiencies however. Therefore we do not recommend the use of specific racing oils initially, although a test program may prove these to be advantageous.
However, we offer the following advise:
Fit a temperature sensor from your data acquisition system into either the gearbox sump area, or into the oil pipeline on a pumped oil system. Monitor the oil temperature and note the pattern of temperature increase and the top temperature achieved. NB it usually takes at least 15 minutes of running to reach a level maximum temperature. The ambient temperature and the loads through the gearbox will affect temperature, i.e. a cold wet day will produce cooler gearbox temperatures.
There are two reasons for logging oil temperature:
1. An above normal temperature indicates a gearbox fault (Bearing or tooth failure etc.). This can detect a big failure before it is catastrophic.
2. When you have established a pattern of gearbox temperature for your vehicle, you can then try different oil quantities and then different oil types. As a broad guide, the oil quantity and type that runs the coolest is the most efficient at lubricating and minimising power loss
Q. Can I buy directly from Hewland?
Yes! Simply contact our sales department:
Tel: +44 (0)1628 827602
Fax: +44 (0)1628 829706
We take all major credit cards.
We also offer discount accounts for those spending over £5000 per year on spares.
Q. Which gearbox is suitable for my race car project?
Please see the Gearbox range pages and do not hesitate to contact us for advice. Colin.firstname.lastname@example.org
Q. I am considering a Hewland gearbox for my street car. Have you got one to suit and is this a good idea?
We do not wish to seem unhelpful, but we have no products intended for street use- neither upgrade kits or whole gearboxes. Hewland is a specialist racing transmission company. Our goal is to have only happy customers (and therefore not to sell something inappropriate).
Whilst nothing actually stops you fitting a Hewland gearbox for street use, there will likely be installation / manufacturing issues for the clutch and engine interface for you to overcome. In subsequent use, the gear noise and non-synchromesh shifting are elements usually deemed unsuitable for street use and `non-race` drivers. If these factors do not put you off, by all means let us look at the project.
Yes, you can view the policy here: http://www.hewland.com/svga/HELprivacy.pdf