dry sump

[adiandvic]

I kinow my chim hasnt got it, but some TVR have, what is it,

[big.jezz]

this is something i always wondered about
there must be someone out there who knows

[poorpeet]

With a normal oil system the sump acts as the oil tank.
Oil is pumped from it to the rest of the engine & then returns to the sump under the force of gravity to begin the process again.
With a dry sump the bulk of the oil is kept in a seperate tank pumped to the engine & back to the tank.
A seperate tank allows for a more compact engine as you dont need a sump to store the oil. You can hold more oil & the crank does not have to spin in an oil bath so in theory less power is lost to internal drag.

[tvrbob]

HowItWorks for all your motoring questions

[ginner]

The wet sump engine can also suffer from starvation of oil in extreme cornering? Think this is why some manufactureres put baffles in the sumps? Dry sumps doesn't suffer from this.

[big.jezz]

how much would it cost for one of these babies is it stupid money

[Martin_S]

You are looking at upwards of about £1500 for the bits, once you have included the pump, sump pan (the normal sump is replaced by a shallow pan with two or more scavenge take-off connections), oil tank, hoses, etc.

Big problem on the Chimaera/Griffith is going to be finding somewhere to fit the oil tank. They take up a lot of space, particularly if you make them big enough to hold a sensible amount of oil for a big V8...kiss goodbye to you boot space!

In all honesty, I can't see that they'd give enough of an advantage over a decent baffled wet sump (possibly backed up by an accusump) to be even worth considering on a Chimaera/Griffith.

[big.jezz]

think i will give that a miss then

[shpub]

Best thing to fit is a John Eales baffled sump. Costs about £275. Got one on the 520 and had no oil surge running on slicks and cornering at 1.5G

Looked at dry sump and it is expensive. Very expensive.

[2 sheds]

Half way house is to fit an external belt driven oil pump, that feeds from bottom of sump, it was developed for racing when dry sumping was against the regs, used it myself in the past.

But also recommend a decent baffled sump as the best/ cheapest solution

Tim

[boosted ls1]

shpub said:

Best thing to fit is a John Eales baffled sump. Costs about £275. Got one on the 520 and had no oil surge running on slicks and cornering at 1.5G Looked at dry sump and it is expensive. Very expensive.

Or, even better still but somewhat rare would be the Group A trapdoor item with it's central chamber and spring loaded oil pick up pipe. It also has 'big wings'.

Boosted.

[shpub]

Johns design is very similar with a trapdoor etc. No big wings though. Can't have them as aerodymaic aids are banned...

[snorky]

speed sixes are dry sumped aren't they ? When I've seen them with bonnet off the oil top-up thing didn't look huge....do they have another bigger tank below that then ???

[spend]

I'd vote for an accumulator, the trade off of only having limited time of protection is balanced by the added advantage of having oil pressure at start up - got to be good for engine longevity (particularly with cars which stand for periods...)

Dave

[2 sheds]

If you fit an Accusump, you'll need a big one as the rover oil system takes a high volume, I think the 4L or 6L, have fitted a couple over the years and remember that the 2L Accusump was a waste of time.
Tim