2.5 litre engine

[Tbedman]

Has anyone rebuilt a 2.5 litre engine. What is the difference between the 2.5 and the 2.25 engine? timco

[SafeAirOne]

Yes and Petrol or Diesel?

[Tbedman]

2.5 Petro is it a good engine? Timco3

[SafeAirOne]

2.5 Petro is it a good engine? Timco3

Hmm...Not sure. I have the more popular 2.5 diesel. That's what I rebuilt, so I probably won't be of much help to you. Somebody here has a 2.5 petrol. Nick Dawson maybe?

[yorker]

Tim in CT had one in his lightweight- maybe he'll chime in.

[Tim Smith]

Still got it. It ran like a raped ape and I thought the engine was great but the previous owner may have been a street light racer with my particular unit. It would pull the lightweight well past 85 miles an hour on a non-adjusted speedometer with new 33" tires on it. If I had a GPS back then, I'm sure I would have figured the truck much closer to 100 than I care to admit. That was with a roverdrive but even still, the gearbox would sound like Armageddon.

That particular engine was set up with a 2 inch exhaust and an SU carb with a ported intake. I believe it was the ACR power plus set up so it probably had a twisty cam as well. Unfortunately it developed what sounded like a rod knock (only some of the time) shortly after I bought the truck, so I pulled it out to find out why. Couldn't find a single thing wrong with the bearings but I did find the rings carboned up beyond belief.

I would have put it together a year ago but I am still waiting for the parts to arrive from another supplier. Till then I'm still running the 2.25 into the ground.

As stock, the 2.5 and the 2.25 have a lot in common. The 2.5 will be 5 bearings and should have some webbing on the block to increase strength. If you like the 2.25, you will like the 2.5 even more.

[NickDawson]

As stock, the 2.5 and the 2.25 have a lot in common. The 2.5 will be 5 bearings and should have some webbing on the block to increase strength. If you like the 2.25, you will like the 2.5 even more.

I'm not seasoned enough to know the minute differences, my anecdotal observations is that most ancillary systems are interchangeable. I had a rough time finding a starter for the 2.5, and the weber carb on there is a beast to work with (or rather find parts and tuning info for). Otherwise, I've felt spoiled to have the power increase and the interchangeability with the 2.25

[Tim Smith]

The starter for the 2.25 will interchange with a 2.5. As for the weber, are you dealing with the single barrel (34 ICH) or the double barrel. I found the single barrel to work fine with a 2.25. If the weber has not already been rejetted, that could be the source of your trouble. There isn't too much you can adjust on them otherwise.

[NickDawson]

The starter for the 2.25 will interchange with a 2.5.

Not according to our hosts and others on this board and the local UK starter rebuilder.
Had to order mine from the UK
Doesn't mean I wasn't led astray

My carb is a 32/34 DMTL I think - out of production, so knocking on wood that it stays in tact

[Tim Smith]

Really? Seeing how the starter bolts to the transmission and the flywheels are practically the same, I wonder what could be different. If your transmission is the newer LT77, 85 or 95 or even the R380, then I can see a possible problem but if it's the good old series box than I bet you could have gotten away with it. Either way, I'd be curious if you had any photos.

Sorry, I don't have much experience with the twin barrel carb.

[yorker]

Tim- what carb are you going to use on your 2.5?

[Tim Smith]

I'm not going to run a carb any more.

The SU is great for power but terrible for economy. The weber single barrel is anaemic for power but can give relative economy. The weber double barrel gives everyone a heartache unless something else is wrong. The Zenith is a fantastic all rounder if it's not warped. If you ask me, all of them are in trouble with the new fuels.

Once I get the details figured out, I think I will have a fuel injection set up that should withstand the new fuels. Don't worry, I won't keep it to myself.

[yorker]

Cool, I was just wondering because I think I know of a guy with a spare 2.5l Weber carb and intake. EFI would be a huge leap forward though.

I remember looking at an Escort throttle body EFI years ago and thinking that that could be modified for a series intake:

http://cgi.ebay.com/ebaymotors/NEW-OEM-THROTTLE-BODY-EXP-ESCORT-LYNX-LN7-83-_W0QQcmdZViewItemQQhashZitem5d2970ea3fQQitemZ400127224383QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

I think that is similar to the one I had in hand when I was dreaming about that.

[Tim Smith]

That Ford throttle body looks like an easy fit doesn't it.

My foray into EFI and electronic ignition may not lead me anywhere good but it's an itch that just has to be scratched.

[LaneRover]

One of the Rovers Mags had an article about a guy who put a throttle body EFI AND a Mini supercharger into a SI Rover.