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260DET

How Much Ground Clearance?

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Project car presently has ~50mm clearance under the engine sump plug which I think is a little bit too low in case the car straddles a ripple strip or something. I 'm thinking that 80mm might be a good compromise, perhaps with some protection in front. What's the experience here?

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Yep, what ever the lowest point of the sump is you need need a crossmember or rails for protection. 50mm is to low. Consider how much bump your suspension  will go into when racing.  And as you say, if you straddle a curb you will need at least 70mm clearance.

so long as you have skid plates for protection you’ll be ok. 

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In my case ride height is set by the rules of the category, for 2B Marque sports:

RIDE HEIGHT All fully sprung parts of the car must clear the ground when both tyres on the same side of the vehicle are deflated.

And also what the suspension dictates in terms of ride height when set up

I would get the suspension sorted first to see where you are and then work out the rest from that to then put in bash plates or go dry sump to minimise the oil pan under the block :)

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