Could anyone post a x-flow rolling road graph?

[christophe]

Evening All

 

Would anyone be able to post any rolling road graphs off 1600 crossflows that they've got? Im doing some modelling of one for my final year uni project but my engine isn't going to be ready for quite a while yet so it would be good to see some to validate my results.

 

Heres my current engine spec but any graphs for 1600 crossflows would be much appreciated, cheers peeps

 

1660 crossflow, 681 Block lightened and balanced,

Ported and polished head with combustion chamber in it,

38mm Inlet and 31.5 mm Exhaust Valves

GT spec camshaft (BLF 22 I think?)

Weber twin 40 carbs

4-2-1 Exhaust manifold

[petrolhead]

here's mine, spec is at top of dynograph

 

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[fergus mk2]

nice engine petrol head

[andypipe]

Here is the one from my all steel 1600 race engine

 

 

And my 1800

 

[Anglia68]

This was my home built 1700 that I had in my old Anglia van.

 

Standard internals,Lotus flat top pistons,Mexico head,Holbay R120 cam,twin 40 Webers and Aldon Ignitor ignition.

 

[TwoLitrePinto]

fair play andypipe, 171.6bhp out of a 1600 xflow...

[5hane]

fair play andypipe, 171.6bhp out of a 1600 xflow...

 

crazy isnt it, espacialy when the 1800 only got 2-3 bhp more !

 

 

but i presurme the 1800 has alot more torque

[Fiesta Steve]

fair play andypipe, 171.6bhp out of a 1600 xflow...

 

crazy isnt it, espacialy when the 1800 only got 2-3 bhp more !

 

 

but i presurme the 1800 has alot more torque

 

It says on the sheet above m8, 13lb/ft more torque at 700rpm less

[Toby]

The theory is, if you can cam a small engine in such a way as to make it rev, it will make the same power (ish because frictional losses are increasing with revs**) as a large engine at lower revs.

 

Limited valve sizes due to bore size restrictions is what limits the "revability" as well as the cam - hence over square - big bore / short stroke engines are favoured where capacity is limited, it makes room for more valve area.

 

The large engine will always (theoretically) make more torque and the same horse power at lower revs**...

 

So what you need is a big revy engine - F1 engines are quite good!!

 

Don't know if this info is of any use to you so sorry if I have gone on or over stuff you knew.

[andypipe]

I think there may have been a slight problem the day the 1600 was done as it usually showed about 150-155 bhp. Got to say that the 1800 is a nicer beast to drive

[christophe]

Excellent cheers chaps

 

I'm after as many as I can get, especially a few near standard ones so any more are much appreciated