posted May 09, 2003 19:31               

I like to ask the following question

How can i identify a super Dexta new performance in compare with a regular super Dexta
I have a German super Dexta is that automatically a new performance Dexta
What are the maximum revs for this type Dexta

posted May 11, 2003 14:00               

No not all super dextas were "New Performance" supers. Super Dextas were introduced during April 1962, while the New performance supers were not launched until June 1963. Basically, there were only 3 differences. Firstly, the New performance range had a blue/grey colour scheme, compared to the traditional blue/orange scheme of ordinary supers.

Secondly New performance Supers were fitted with a simms 4696 minimec pump compared with a simms 4588 minimec fitted to the ordinary supers. The 4696 pump gave the tractor slightly more horsepower, boosting power from 39.5hp to 44.5hp.

Lastly the New performance supers had a slightly increased hydraulic capacity compared to ordinary Supers.

The first New performance Super Dexta chassis number was No. 09C 913383, so if your chassis nomber comes after this one then you have a New Performance Super, butif it comes before this number then it is just an ordinary Super.

Hope this helps.

posted May 11, 2003 19:01               

Regards Trijnco

posted May 12, 2003 17:33               

If this is truely the case, then why is the clock on my blue/grey super only clocked to 2,400rpm?

The tractor was registered on the 11 october 1963, has an 09C chassis number and a 1637833 engine number?

I have come across rev counters clocked to 2,600 rpm but never 3,000. I always thought hp was adjusted on the internals of the injector pump and not by increasing rpm??

Does anyone else have any thoughts on this matter? If Oscar is right, then it looks as if i'm gonna have to search for a new rev counter!!!

posted May 12, 2003 18:10               

The adjustments to the pump were to allow the engine to rev higher. From memory,(so this might be inaccurate)the HP on the Dexta was quote at 1900 rpm originally then on the New Performance quoted at 2100 rpm.

I do not remember rev counters to 3000 rpm in this country but anything is possible on export models such as Oscar has. I will check later today and let you know.

regards

posted May 12, 2003 23:21               

Thanks for the info. It's good to know that there's always something more we can learn about these little gems every day

posted May 13, 2003 07:16            

I've been driving a car with a 90 HP, turbo loaded, common-rail diesel engine for the past few years. The strength of that thing was unbelievable. Now I've got a 110 HP petrol engine in a much smaller car. I expected it to be faster. And it is, in terms of top speed. But for overtaking a truck on a 2-lane road, forget it. With the diesel, I just depressed the pedal a bit more and she went flying. Between 2,000 and 2,500 rpm, she just pulled and pulled and pulled. With the petrol one, it's back to fourth and flooring the thing. Things hardly happen before 4,000 rpm and then she takes off like a jet. It's fun, but I prefer a diesel any time.

But I digress .

posted May 13, 2003 17:37               

The first two ran from November 1957 to June 1960. One in MPH the other in KPH.

From June 1960 to end of build there were another two. Again in either MPH or KPH.

There were two for the petrol Dexta from November 1960 to end of build. MPH and KPH.

Then two specials, one for Sweden and one for Germany which had special gear ratios.

The rated speeds for the Super Dexta diesel engines were as follows 39.5 hp at 2200 rpm and the New Performance was 44.5 hp at 2450 rpm. If you are getting 3000 rpm out of yours Oscar I would be a little worried as from what I remember, 2600 rpm was pretty fast.

The Minimec injection pumps for the Dexta and Super and New Performance Super Dexta had most parts in common. The delivery valves and tappet spacers were change for the New Performance tractors to give a little more fuel. There is also a different air cleaner on the NP tractor. The fan and fan shrouds also differ.

The injector nozzles and holders also changed in June 1963 but this change included all tractor back to 1957 with the exception of the US.

This information comes from a Fordson Parts book from my old dealership, donated recently by an old storeman friend.

regards

Brian

posted May 14, 2003 07:28            

I'd bettter change the Q&A page then, I guess . BTW, I have a regular '59, not a Super, and I rarely go full-throttle.

Before I change the Q&A page, are we all agreed that no Super ever made it to 3,000 rpm and that the following is correct instead?

posted May 14, 2003 09:47               

No DEXTA Diesel of any type should rev at 3000 rpm. The speeds given are across the board. 2200 to 2500 max. I will look into the exact revs of the Dexta but I am pretty certain it is around 2200 rpm.

regards

posted May 17, 2003 06:30               

No DEXTA Diesel of any type should rev at 3000 rpm. The speeds given are across the board. 2200 to 2500 max. I will look into the exact revs of the Dexta but I am pretty certain it is around 2200 rpm.

Hi Brian and others

For my knowledge the max revs from a N.P. super dexta is 2250 R.P.M.
The rev counter goes to 2400, and i can not imagine that it goesoriginaly further than the counter
On the manual page on this site, the road speeds at indicated engine speeds are given at 2250 R.P.M.For the new super Dexta
Power is not only a question from R.P.M, but also from torque
A formula 1 engine cannot pull a heavy trailer although it has enough horsepower but it has not the torque to get it from place.
torque hasto do with the stroke from the piston and the way the crankshaft is build
Hi torgque in a car (diesel) means less shifting but also less acceleration by high revs
Regards from your fellow dexta fan Trijnco

posted May 17, 2003 12:10               

The rated speed of the Super Dexta I quoted came from the Fordson issued workshop manual here in England. Here the road speeds are all quoted at 2000 rpm max.

The difference between the tractor rev counters is because your unit was a special for a German Dexta and there were speed restrictions imposed on tractors for the German market. You might find that all Super Majors and the later X and Y series tractors all had to have top gear blanked off to keep within the speed restrictions.

Your Dexta is special!! That is why we do not want you to change the mudguards etc.

regards