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Remember that the ROLLING diameter may be very important: this stuff can be found on maunfacturers web sites, or a large on line site such as The Tire Rack... Remember also that the width is only on the specified rim for that tire as specified by that manufacturer..and often the same width tire...

Less important than fuel fires, but.. why disable the vaccum advance? Surely vacum advance working correctly makes a more responive motor at part throttle, saves fuel and cuts air pollution? I know in years gone by locking out the advance made the spark timing more accurate, but surely we have...

Hi all, has anybody anywhere built a quality replica Mirage, or know of where body components might lurk? I understand that many people may not see them as the definative GT40, or that there may not be much demand for such a car, but personally I think a replica Mirage would be a truly...

Lynn, I have a strong feeling you are heading for disaster by putting the brake bias "where the weight is". A GT40 is not even close to a full reversal of a normal car, when it is slowing down, so fitting a reversed bias will not be the way to go.... The the moment you slow the car when...

cHRIS, I assume that given Robert's work with the 4.6 installation, and Ford's work with emissions, that motor could be a gun thing for an emmsiions legal Astralian 400 hp RF/gt40...however the crank height and gearbox adapters would need to be ballpark.. and our local Motec cold control one...

Hi the exhuast extractor effect is less critical than inlet tuning: it works over a wider rev range. Small differences in length will cause small differences in the range tuned revs for each cylinder, and unless you run a fully mapped EFI, the engine tune will also be slightly compromised to...

Pick me!! I am interested, please let me know the details by email if you wish! Rob

Burning oil is very bad for the fuel octane number: if you get 5% oil for example, in the mixture, the octane drops by5%. A high compression motor might ping immediately. So regulating the oil into the inlet system can be v important. Another point is that many breathers into the carb work at...

A Cosworth? WOW Which year/spec?? ZOOOOM

A mercury Cougar! Stylish! Well, almost

At low speeds and light throttle, backpressure is minimal..and any that exists has to do with exhaust restriction rather than the collector branches. It souknds like wrong plugs, or the engine is running way off tune: too much fuel, or very poor timing

I would assume an identical coefficient of thermal expansion is very important, unless the whole thing is prestressed in some complex way? This would suggest that alloy would therefore not be the most suitable material? Rob

Is CNC porting a reliable and cost effective thing in the US? Any suggestions of who to talk to? I was thinking 5 litres to 75/8000 rpm with programmed fuel injection, for hillclimbs/racing

Hi all, can anybody shed some light on the design and purpose of the GT40 alloy heads, the GT40X heads, and the Victor Juniors? Rob

Hi make sure you are running windows 98SE. This upgrade irons out many of the bugs, and makes it a favorite version of Windows for many who run old programs! Email me if you need any details Rob

Gordon, do you publish power curves of your "spec" motors at various levels? thanks Rob

Hi, can anybody decribe the different notes of a 8->2 and an 8->2 crossover exhausts? I assume the 8->2 crossover sounds like a flat plane crank, in that it howls like a very large 4 cyl motorbike? (or indeed a formula 5000...) Has anyone seen or heard of an 8->2->1 pipe? Surely that would be...

Hi all So it seems that Ford made a mess of it's dohc v8! So sometimes it is not assembled correctly, and some of the engineering is dodgy. (What a shame Honda didn't build it for them...but they have an agreement to "exchange technology" with GM) But even Mazda build some great DOHC motors- for...

A few questions from the other side of the pond: Is the 4.6 taller due to it's sump height, deck height or just the heads? And if the heads flow well, what are the power limitations- some mechanical bits that have not been designed with modification in mind? I have seen rods etc advertised, for...

A well designd DOHC can and should provide a wider flatter, and taller torque (and therefore power) curve than a 2V motor. They can be more tolerant of high compression, and therefore the 8% smaller capacity should not be an issue. In theory! (Just look at the Hondas in particular) Does anybody...