AustenW

I've set mine to 7800rpm as it was just hitting the limiter in forth over the quarter at 7200

Just wondered what others are running?

Garage19

I have set the one on the white 3dr sierra at 7000rpm to start with. As far as i can remember the redline on a stock mondy is 6500rpm???

Do you have a steel crank in yours??

Rolls

iTrader: (2)

Surely this is shuold be governed by the engine components rather than rasing it just to have few gear changes up the quater...?

AustenW

All Steel

Fudgey

iTrader: (4)

std zetec is 6200, mine will be 7000 with the turbo

Garage19

Flash bugger! How much did your crank set you back? Was it from the states?

Are you going to go to Ford Fair this year? Would love have a nose round your car in the flesh.

Garage19

Whats the mean piston speed in m/sec @ 7800rpm??? We can compare it to some other engines with similar designs.

AustenW

The engine stands me at a fair bit. Crank was sourced in the UK.

I will be at Ford fair on the Sun, Racing at USC at pod on the Fri and Sat so will drive up on the Sun if I dont break something.

Not done the calculations for this engine yet

Garage19

Cool, see you then.

Stock 88m stroke?

AustenW

Yes 88mm stroke

Garage19

22.88 m/sec.

From memory, when i had the long stroke motor in my super mono race bike i used to run 25/26 m/sec.

F1 engines run about 27 m/s.

reality

There is only one true way to see what the limit is.. and it's an expensive way..

GARETH T

i think F1 engine run even higher than that now,,,, cant remember a number for it now though

reality

Well, F1 is about 40mm stroke @ 20,000rpm.. so go figure

Garage19

I just have, based on your figures, 26.6 m/sec.... as said above.

GARETH T

im sure ive heard figures closer too 28m/s i could be wrong though

Garage19

I think there is a kinda limit buffer that they run into that is all to do with pecentage of the bore that can be filled with valve area and the physical limits of how fast you can move a volume of air through it.

Its not governed by material properties any more, as it was in the old days.

I have dragged that right out from the back of the grey cells so dont take it as gospel. If i have a spare min i'll look it up again.