generating front down force
generating front down force
(OP)
currently building rear wheel drive classic mini 240bhp
has tendencey to lift at greater speeds. my qestion is this
as i want to keep the exterior of the shell original how can i create downforce through the front grill ie in what was the engine compartment, dont want external spoilers etc
any ideas ?
has tendencey to lift at greater speeds. my qestion is this
as i want to keep the exterior of the shell original how can i create downforce through the front grill ie in what was the engine compartment, dont want external spoilers etc
any ideas ?





RE: generating front down force
RE: generating front down force
Basically you need to arrange for the air under the front axle to expand. So, fit a front spoiler to reduce the amount of air coming in, side skirts to prevent leakage, and then a shaped floor to the old engine bay to expand the incoming air efficiently.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: generating front down force
it is 100mph + when on circuit i will be cornering at these speeds hence my concern
abit more infill, i know im being a bit fussy but it really is important to keep the original external lines of the car as i am dual building ie it will be road leagal but all road going bits will simply click off to reduce weight for racing.
the front end is carbon fibre etc with rad and fuel tank etc under the bonnett. ive thought that doing a flat floor pan with rear diffuser would be a subtle as i can get.
question does the diffuser only give more rear grip?
therfore increasing my problem ?
question are you suggesting that i resrict air through fron grill and perhaps vent out through bonnet in which case does exit hole have to be bigger that entry hole?
RE: generating front down force
Starting from the back of the car the diffuser is used to decelerate the air underneath the car back to the free stream velocity. As such it will create maximum downforce where the slot is narrowest, and none at the very back.
Moving forward along the car, if the velocity stays high then the downforce stays high. So you want to keep the narrow slot.
At the front of the car we have to encourage the air to accelerate to a high speed, and feed it into the slot. Having an enormous frontal area for the 'intake' won't help - that's the funnel analogy and it does not work (hold a funnel out the car window, wide bit to the front. What speed is the air coming out the spout?).
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: generating front down force