2.5 Petrol- How slow? - Defender Source
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  #1  
Old September 25th, 2012, 10:49 PM
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2.5 Petrol- How slow?

Guys:

I've been lurking for a while lately but am getting a serious itch to get another Defender (I sold the '94ST I restored with the help of this group a couple years ago.) and came across a really clean 87 D90 in England with the 2.5 petrol engine.

I've got a friend there to check it out for me but wanted to get some sense of just how slow these might be before I move forward.

So for those of you who have owned one, would you describe it's acceleration as:
  1. Glacial
  2. Sloth-like
  3. What acceleration?

All joking aside, are these acceptable if one is going to use it mainly for running around town, etc. No long highway trips, etc. Will they hold 65mph on level ground?

And if the acceleration really doesn't meet expectation, I'm assuming a V8 swap would be feasible without too much trouble. Or would it require a new gearbox and transfer case, etc.?

I appreciate any insight you guys can pass along.

Looking forward to re-joining the community.

Cheers,

CARL
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  #2  
Old September 25th, 2012, 10:52 PM
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My 2.5NA diesel does 60-65 when it's flat. I don't see why would not be same or better. It's not till yo start driving over hills does it get painful
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  #3  
Old September 25th, 2012, 11:11 PM
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It's, well, slow.
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  #4  
Old September 26th, 2012, 12:19 AM
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My series with a 8:1 unleaded 2.25 with a 2bbl Weber will hold and accelerate above 60mph uphill in 4th (top gear for me), i am told 70 is obtainable with OD (installing soon). I thought i was gonna dread the acceleration but it gets up to speed safe enough for modern traffic, and it runs fine around town.

That being said the 2.5 is a little bigger motor so should be higher power, and as long as its running good i can't see a reason why it won't do 65-70 with the 5 speed.
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Old September 26th, 2012, 11:00 PM
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Thanks guys, seems like it would be reasonable for my needs.

Though it might be nice to re-power it at some point, provided it's not too much of an ordeal.

Cheers,
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  #6  
Old September 27th, 2012, 02:10 AM
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The 2.5 petrols i've driven over here have been pretty quick. More or less the same as a Tdi (70~80mph easily) but much more thirsty.

What they lack in torque compared to a Tdi they make up in higher revs. they do actually sound quite nice too.

The carb is a complex thing though, with fuel shut off solenoids and other crap on them. Don't know what the tuning scope is for them, as over here we just shove in a 200Tdi (bolts straight in) and be done with it.
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Old September 29th, 2012, 01:24 PM
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Quote:
Originally Posted by diesel_jim View Post
The 2.5 petrols i've driven over here have been pretty quick. More or less the same as a Tdi (70~80mph easily) but much more thirsty.

What they lack in torque compared to a Tdi they make up in higher revs. they do actually sound quite nice too.

The carb is a complex thing though, with fuel shut off solenoids and other crap on them. Don't know what the tuning scope is for them, as over here we just shove in a 200Tdi (bolts straight in) and be done with it.
Yep that's what I did, they're thirsty. Doubled the mpg by bolting in a tdi and it's a straight bolt in job (provided you get a defender tdi) just need the rad & intercooler that goes with the engine, the engine wiring loom that plugs straight in to the existing and you're good to go, week end job
V8 would be more involved. Engine mounts, rad & transmission.
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Old September 29th, 2012, 02:38 PM
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They are all about the same acceleration and top speed. The 2.5 petrol rips through gasoline at 70mph though and is very uneconomical. It will be tough going up hills above 60mph. But it's about the same as a 2.5 diesel just less efficient.
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  #9  
Old September 29th, 2012, 05:24 PM
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Hit 66mph in the series last night according to the speedo app on my phone, i was in 4th and i could have pushed further i just had no interest in putting at its limits, i have no tach.
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  #10  
Old September 30th, 2012, 08:09 PM
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I think I could live with this sort of speed and the fuel economy is not too much of a concern. I mean, could it really drink as much as a V8?

The TDI conversion is tempting but I'm a bit concerned about running into issues importing it without the original engine. For what I've read on the NHTSA (or was it DOT or EPA) website this could be a problem.

Cheers.
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  #11  
Old October 1st, 2012, 12:42 PM
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Quote:
Originally Posted by JohnsD90 View Post
Hit 66mph in the series last night according to the speedo app on my phone, i was in 4th and i could have pushed further i just had no interest in putting at its limits, i have no tach.
I don't think you'd over rev, more likely to run out of oomph to push the truck to the red line in top gear.
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  #12  
Old October 1st, 2012, 03:07 PM
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A D90 without a lot of junk on it with a 2.5 petrol is reasonably quick (unlike the 2.25/2.5 NA diesels which are glacial).

I had my series with the 2.25 p with the speedo pegged with 7.50 r16 tires.
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Old October 1st, 2012, 03:37 PM
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What is the expected gas mileage for this 2.5 conversion?
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  #14  
Old October 1st, 2012, 03:46 PM
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Quote:
Originally Posted by Daddymow View Post
It's, well, slow.
Andy thirsty - I think I get abt 12-14mpg
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  #15  
Old October 1st, 2012, 04:10 PM
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Like you said, just get the truck with the 2.5 and bring it in that way. You can source and install the tdi yourself if you decide it is warranted.
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Old October 1st, 2012, 05:59 PM
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Quote:
Originally Posted by Green Blood View Post
I think I could live with this sort of speed and the fuel economy is not too much of a concern. I mean, could it really drink as much as a V8?

The TDI conversion is tempting but I'm a bit concerned about running into issues importing it without the original engine. For what I've read on the NHTSA (or was it DOT or EPA) website this could be a problem.

Cheers.
Yes, and it's not nearly as quick.
Lived with my 90 like that for about a year then a 200tdi engine came along, once it was sorted it was much better. I think the petrol engine was "very tired" though. (As was the injection pump on the tdi but that's another story.)

------ Follow up post added October 1st, 2012 11:06 PM ------

Quote:
Originally Posted by Overland90 View Post
What is the expected gas mileage for this 2.5 conversion?
It's not a conversion, it came that way.
Think I got about 15mpg imperial from my 110 with the 1.6 transfer box they came with.
90's had the 1.4 transfer box as standard same ratio as a tdi.
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  #17  
Old October 1st, 2012, 08:12 PM
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I often wonder about this - can you actually over rev a 2.25 in a series? I routinely run mine WOT but am unsure what revs it's doing. I should verify the speed with a gps but I can do 65 on the flat no problem (again revs unknown).

Quote:
Originally Posted by mikeslandrover View Post
I don't think you'd over rev, more likely to run out of oomph to push the truck to the red line in top gear.
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  #18  
Old October 2nd, 2012, 07:04 AM
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I did the ole put a rock on the skinny pedal to a 2.25 that had a bad bearing and a broken crank snout. It screamed for about 15 min and overheated as the water pump wasn't connected......a few minutes later it seized. Not sire how you'd over rev one or if it would matter.
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  #19  
Old October 2nd, 2012, 10:32 PM
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Quote:
Originally Posted by junkyddog11 View Post
I did the ole put a rock on the skinny pedal to a 2.25 that had a bad bearing and a broken crank snout. It screamed for about 15 min and overheated as the water pump wasn't connected......a few minutes later it seized. Not sire how you'd over rev one or if it would matter.
The horror!

I don't think I could bare to do that to an engine. Even one that was destined for a rebuild.
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  #20  
Old October 4th, 2012, 06:05 AM
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Yes you can over rev the petrol 2.25. Mine would always (if I revved it too hard) cause the rocker to come away from the push rod. Must have been getting some valve bounce. ie. needed stronger springs, or they were simply worn out.
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