SBD Customers Cars
SBD Cars
SBD Motorsport
SBD Cars
Frequently Asked Questions - Oil Systems
 
Please Note: Never to use forged 90-degree couplings.
They create cavitation due to the fact that they prevent free flow, basically the problem is the coupling effectively has 2 opposing drills.  This means that when the oil is fed at pressure instead of going through a smooth curve as it would with a swept coupling, the oil reaches the end of the drilling, some of the oil will pass around the corner and some will bounce back.   We have seen engines fail by simply the addition of one forged coupling anywhere in the oil system, so we never recommend the use of the this type of coupling because the only way to find out will be to see if your engine destroys itself.
 
Dry sump tank shape
Oil Problems & engine noise after Track Day
 
Dry sump tank shape

Question: I would prefer a rectangular dry sump tank, why should I use a circular tank?

Answer: As far as using a circular tank is concerned, it is far more efficient for the returning air and oil mix to be spun around the wall of the round tank so the air separates out and only oil can then reach the bottom of the tank. A rectangular tank cannot work in the same way and the oil would simply bounce off the walls, carrying the air which is trapped in it to the bottom of the tank.

Dry sump tanks

Return to List

Oil Problems & engine noise after Track Day
Question: After track day session of 15 minutes, I let the car cool for about 3 hours before driving home, on restarting it the oil light stayed on and it sounded like the engine was knocking, (either that or someone had replaced the engine with a diesel! I checked it had sufficient oil in, and whilst not full to the brim it did read about halfway up the dipstick. I drove the car for approximately 3 minutes with the oil light on and the noise continuing, the second the light went out and the noise stopped immediately. I was obviously not driving it hard, or putting the engine under too much load as I did not want to damage it. The problem I thought had cleared and I was fine to continue.
However every time I now get in the car and start it from cold or warm the noise reappears and the light again stays on until the noise stops, it is always at least 2 minutes before the knocking type noise disappears, sometimes up to 5 minutes, I have consulted another C20XE which has the hydraulic lifter problem and that is not the noise my engine is making, the lifters sound fine. This is leading me to think there is a problem with the oil pressure / pump / pickup. I have recently put the engine into the nova myself and replaced the oil and filter with new non-Vauxhall types, using a semi synthetic oil. As the problem has never been seen before the track session only after, I am assuming this has instigated it, but what exactly 'it' is, I don't know. A nylon pressure relief valve which is better than the Vauxhall item has been suggested, which I have seen on your website, but is this the right item to get and will it solve my problem?

Answer: When a car is used on the normal high way, even when driven at speeds shall we say that are close to being illegal, this puts nowhere near the same strain or stresses that are involved in track use. Considerable improvements have to be carried out to the breathing system and baffling to the sump pan to prevent the damage that you have described. You are likely to have two problems. I would imagine that the oil was surging during cornering during your track day. Then instead of sucking oil up into the engine, you were sucking up air. This would damage your bearings initially. The gaps would become larger, then when the car returns to the straight, due to the damage to the bearings, more of the oil supply would be needed to accommodate the increased clearances. As you repeat several laps under the same conditions, the bearings would become more and more damaged. The pressure would then begin to drop in the engine to a dangerous level. The pressure would drop first in the top end of the engine, this would make your tappets rattle. If you were to leave the engine idling for a period of time, the tappets may quieten down until driven hard. This is provided the tappets have not become damaged from running with a lack of oil. The damage to the bearings would now be so bad, that the engine is in danger of complete failure from running out of lubrication altogether. Your engine must be stripped down completely, measured to see if any damage or distortion has occurred to the rods or crankshaft. If you are lucky you will just be able to replace the bearings and then the modifications I have suggested should be done, before the engine is returned to the track.

Return to List
 
Please check our customer cars section which may help answer your questions
 
2.0L Vauxhall Components | 1.4L & 1.6L Vauxhall Components | Duratec Components | Hayabusa Components

Home | Price List | Sitemap | Contact Us
Events | Press Coverage | Meet the Staff | Frequently Asked Questions | Distributors, Dealers & Links | Sponsorship | Terms & Conditions | Privacy Policy
SBD Motorsport Ltd, Unit 15, Red Lion Business Park, Red Lion Road, Surbiton, Surrey. KT6 7QD. Tel: 0208 391 0121.
Email contact details | Like us on Facebook | Follow us on Twitter