Thread: 2a 2 1/4 Diesel top speed

Hey, I'm no angel when it comes to landies. I tend to break things, alot.

I just advise others not to follow my lead.

CC

Thanks for the replies , based on the feed back I might have a look at the injectors and pump, these are the only engine components I haven't rebuilt yet. I should probably check the max engine RPM first.

Mine used to sit comfortably on 80kmh and could push it to 100kmh. BUT BLOODY NOISEY AT THAT SPEED.
You've shown us that photo before Isuzurover - my ears bleed when I think of how loud that would be.

Originally Posted by VK3UTE

[COLOR=black]...based on the feed back I might have a look at the injectors and pump, these are the only engine components I haven't rebuilt yet. ...

Apart from the low top speed, what does it drive/accelerate like, and how much does it smoke (and what colour).

I would suspect timing as a first port of call. If you have dribbly injectors it would likely be smoky. New nozzles are very cheap. The pump could be at fault, but I have never reuilt mine, just replaced a couple of seals. So my pump is probaly far below optimal, but I can still reach the speed shown above (or could when the engine was healthy!).

A good 2.25D should accelerate almost as quickly as a 2.25P.

If you have the vacuum assembly on the intake, removing it will gain you power.

If the throttle stop (top speed) is set incorrectly, it should still accelerate well.

Originally Posted by Sleepy

...You've shown us that photo before Isuzurover - my ears bleed when I think of how loud that would be

We bought 6 packets of disposable ear plugs before the trip from Brisbane-Perth

I normally sat on 50-55 mph though - both for the sake of the engine, and my (earplugged) ears!!!

Originally Posted by isuzurover

Apart from the low top speed, what does it drive/accelerate like, and how much does it smoke (and what colour).

I would suspect timing as a first port of call. If you have dribbly injectors it would likely be smoky. New nozzles are very cheap. The pump could be at fault, but I have never reuilt mine, just replaced a couple of seals. So my pump is probaly far below optimal, but I can still reach the speed shown above (or could when the engine was healthy!).

A good 2.25D should accelerate almost as quickly as a 2.25P.

If you have the vacuum assembly on the intake, removing it will gain you power.

If the throttle stop (top speed) is set incorrectly, it should still accelerate well.





We bought 6 packets of disposable ear plugs before the trip from Brisbane-Perth

I normally sat on 50-55 mph though - both for the sake of the engine, and my (earplugged) ears!!!

She accelerates very well, better than I expected to be honest. I will double check the timing as that would make sense as being the cause. She blows a little blue smoke which I'm fairly certain is from me fitting the incorrect type of valve stem seals(you know when you know something is not correct but you keep going anyways, idiot). I put back the same type as came out, so whoever was in there before got it wrong.

I managed to go for a run in a series 3 diesel yesterday and it felt very similar, peaked out in top gear at about 85kph. He also had an overdrive fitted which it pulled beautifully up to 105kph on flat ground. he had 33" tyres fitted too.

Based on the run in the series 3, in hindsight maybe I was expecting a bit much.

So, I will check the timing and see how she goes.

Thanks for the advise!

I normally sit on about 50mph (80kph) but I do easily wind it up to 60mph (96kph) when I am entering a freeway. At this speed, it has not yet reached the rev-limiter, but is starting to run out of power. I have broken the 100kph mark on a long straight section of road. Have you accurately checked the injection timing?

Aaron.

Originally Posted by Aaron IIA

I normally sit on about 50mph (80kph) but I do easily wind it up to 60mph (96kph) when I am entering a freeway. At this speed, it has not yet reached the rev-limiter, but is starting to run out of power. I have broken the 100kph mark on a long straight section of road. Have you accurately checked the injection timing?

Aaron.

Thanks Aaron. I will check and see how it looks.

Cheers Simon

I could happily sit on 90kph in mine

I would check that the accelerator linkage allows the throttle on the pump to move its full extent - ie able to hit the stop screw. If you have the old bell crank system, there is a fair bit of slack in the system that could result in max pedal = 3/4 throttle or something like that.