2a 2 1/4 Diesel top speed

[VK3UTE]

Hi All.

Recently fitted a rebuilt 2.25 diesel into "Mary" my SWB 88. Flat out down hill in top gear the GPS tells me she is doing 76km/h:eek:
She has 235 85 tyres on the back

I expected her to be slow but is this normal? I was hoping with a rebuilt motor would crack 80km/h:angel:

Cheers

[Blknight.aus]

fozzy hits 105ish on the flats and a bit more with a run up or tailwind

[Scouse]

Hi All.

Recently fitted a rebuilt 2.25 diesel into "Mary" my SWB 88. Flat out down hill in top gear the GPS tells me she is doing 76km/h:eek:
She has 235 85 tyres on the back

I expected her to be slow but is this normal? I was hoping with a rebuilt motor would crack 80km/h:angel:

CheersTo accelerate past 76kph on the downhills, use angel gear not top gear.


I wonder if I could drag off a diesel Series with my bicycle - I hit 60.2kph on the M5 last week :).

[newhue]

Hi All.

Recently fitted a rebuilt 2.25 diesel into "Mary" my SWB 88. Flat out down hill in top gear the GPS tells me she is doing 76km/h:eek:
She has 235 85 tyres on the back

I expected her to be slow but is this normal? I was hoping with a rebuilt motor would crack 80km/h:angel:

Cheers

Sorry, that is so funny....hoping for 80

[Johnno1969]

Hmmm. I don't know. Mine will do 100km/h with the OD engaged, but I don't try to push it anywhere near that with "normal" top gearing. Mind you, I very rarely exceed 80km/h even with the OD, trying to be kind to the old thing. She's very happy at 44mph... I've noticed that much.

A lot of the reason I am scared to go over 80km/h probably has a lot more to do with the overdrive than anything else. That shrieking makes me think everything else is about to explode. When I am finished assembling the Fairey with new bearings and the extended sump (for anybody who's interested, Hodgo posted some pics of my sump modification in technical chatter a few weeks ago and I will post a thread once it's all running) I will see how it all goes....

John

[justinc]

Surely Dave would've seen one at 160k+, (Out the back of a herc...without a chute:twisted:)


When I had my 109" 2a 2.25 petrol, I was amused to see that I had to speed up to reach the 70km'h sign outside most rural towns while on my 8 hour drives from Perth to Albany back in the day...:eek:

I was on my P plates, my folks were well chuffed I couldn't actually speed in it...:( Next vehicle was a V8 ZF Fairlane:twisted:


JC

[isuzurover]

Here is a pic of my speedo if it works:
https://www.aulro.com/afvb/images/imported/2011/11/278.jpg
(speedo in MPH, still some accelerator travel left, 33" wheels, speedo accurate, on the flat).

[Col.Coleman]

There is a big difference between what is achievable, and what is comfortable and mechanically sympathetic.

CC

[Mick-Kelly]

Used to hit 105 but cruze on about 90 in mine with 7.5 x 16 Xtra grips. Was kinda noisy

[isuzurover]

There is a big difference between what is achievable, and what is comfortable and mechanically sympathetic.

CC

Agreed, but a healthy 2.25D should be able to manage a LOT better than 76 km/h.

FWIW, my 2.25D has survived 12 years, many extended 4x4 trips, and a 15000 km trip across the country. It has developed excessive blowby (and suspected low compression), however I am not unhappy with the longevity.

[Johnno1969]

Agreed, but a healthy 2.25D should be able to manage a LOT better than 76 km/h.

FWIW, my 2.25D has survived 12 years, many extended 4x4 trips, and a 15000 km trip across the country. It has developed excessive blowby (and suspected low compression), however I am not unhappy with the longevity.

Yeah, mine's always built up lots of pressure and spat oil out the breather whenever cruising on anything approaching "fast" (which I very rarely do). But it's always been a very healthy engine. Ten years since rebuild (admittedly a lot of that time I've been away) and runs sweetly, never touched since finished putting it together. The compression seems very good still. Starts easily without heating, even in winter. But it does spit out oil....

[Col.Coleman]

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

[VK3UTE]

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.
http://www.aulro.com/afvb/members/vk3ute-albums-mary-picture2840-sam-0162.jpg

[Sleepy]

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

[isuzurover]

[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.




...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 :D

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

[VK3UTE]

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 :D

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:oops2:(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:angel:.

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

Thanks for the advise!

[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.

[VK3UTE]

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

[Veryan]

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.

[korg20000bc]

I reckon if you wanted to get some more speed you might consider putting an electric fan on the radiator and deleting the heavy,old metal one from the front of the engine. I read somewhere that it takes about 5% of the horsepower to turn the fan. But if that's wrong i'm sure I'll soon be put right :)

[Johnno1969]

Yeah, I'm thinking of removing the fan... a few more horsepower in such a staggeringly grunty unit might actually make a noticeable difference.

Mind you, I would always be worried that my electric fan might go on the fritz on a hot slow day lugging in low range. I might carry the old fan around behind the seat, just in case...

We've all been here before, but any more ideas for a few more horses??

[VK3UTE]

I think any improvement to the original exhaust system would make a considerable difference, its a bit of a pea shooter. :rocket:

[Blknight.aus]

Yeah, I'm thinking of removing the fan... a few more horsepower in such a staggeringly grunty unit might actually make a noticeable difference.

Mind you, I would always be worried that my electric fan might go on the fritz on a hot slow day lugging in low range. I might carry the old fan around behind the seat, just in case...

We've all been here before, but any more ideas for a few more horses??

extractors, injector crack pressure set, nozzles replaced, timing advanced a degree or so. Pump Tweakery

[VK3UTE]

Ladies and Gentleman, not only did Mary do 80kph today she even made it to 60MPH!:burnrubber:
Boy does that feel fast in a series 2!

Thanks to everyone for your feed back, it turns out the high speed adjustment was set to only 2600rpm as well as some of the linkages being loose. Reset the max engine RPM to 3600 and she goes like a rocket. The workshop manual states 4200rpm as the max so once the engine is completely run in I will go for the extra revs. :BigThumb:


Cheers Simon.

[Johnno1969]

Steady on, Simon. Human beings were never meant to do such mad velocities....

Cheers,

John

P.S. I heard that somebody entered a IIA diesel at Le Mans in 1968. It's due over the finish line next Thursday. Should be worth a look.

P.P.S. Good to hear you've got your motor car sorted.