Bf Valve Springs

[BFHOON]

I have read a few posts about valve springs.

in some cases people have opened there rocker covers to find the better springs have been fitted from the factory.

is this the case with others that have modded there bf xr6turbo,s

also was interested in how the ford tyre pressure monitor guages work

[Fat-Tony]

this is a PM I got on another forum from Simon (Nizpro)

You will be fine,as except for a couple of Ford BF crate engines we had late last year all the current BF's have heavy duty springs, they are good for around 370 rwkws

Hope this helps

[Iconic Bionic]

As long as they work forever imhappy. But what do they again??

[Paradoxx]

Any word on costs compared to other types available to upgrade to?

[Paradoxx]

As long as they work forever imhappy. But what do they again??

←

They return the valves to their closed position while the cam is not pushing them open... if the springs are weak like in the BA Mk 1 they can remain open which means loss of compression.

[Fat-Tony]

Any word on costs compared to other types available to upgrade to?

←

They are ment to be valve springs from a Typhoon, as nething that has the name Typhoon they will prob have an infalted price on it its prob just cheaper to use a set of nizpro cobra springs or performance springs

[Fat-Tony]

As long as they work forever imhappy. But what do they again??

←

When incresing boost you increase pressure on the back of the exuast valve as you are running higher exhaust manifold pressures, this really isnt helped by the use of the stock intercooler. testing has shown to get 11psi at the manifold your turbo needs to make in excess of 16psi, backpressure on the exhast valves is about twice that of the actuall boost pressure at the compressor wheel. So your effectivly putting 10psi extra pressure on the exhaust valve than there need be just to acheive 11psi with a stock intercooler.

Food for thought when you think about modifying your car

PS its the exuast valves in the BA that tend to give you the headaches when you want to make more power

Cheers Adam

Edited 03/06/06 11:34 PM by Fattony