Mpg

[Healewis]

what shoul the MPG be on a 2.4 td compared to a 3.0td and will a 3.0ltr, fit on to the 2.4 manual box?

[JimL]

As far as I know MPG is the same and about the gearbox, Elvz will tell you for sure but I reckon she'll say the gearbox fits both engines.

[Pete]

From what I have read both on this forum and the old one, I would say the 3.0 does slightly more mpg than the 2.4. Do a search, you should come up with a few threads to read.

[Elvz]

Yup you're right Jim.... The manual gearbox fitted to all diesel Surfs from the mid-'80's to 1999 is a R150X but pre-'91 cars with the 2LT engine have a different clutch, flywheel, and bellhousing to the later 2LT-E and 1KZ-TE engines.

The thing that makes the 3000cc engined cars more economical than the 2.4's isnt the engine. Almost all the 2.4's are fitted with 4.87:1 final drive ratio, the 3 litre is usually 4.30:1

[Healewis]

The lower ratio is due to the power produced through the 3000 unit I'm assuming, so, if that's the case, if I fit a 3000 in to my 2.4, The acceleration should be pretty ruddy good yah???? So I want a 3.0td unit for a J reg 92 then when the Cylinder head blows I'll just swap the lot? What do you think?? Cash is waiting

[rich]

The lower ratio is due to the power produced through the 3000 unit I'm assuming, so, if that's the case, if I fit a 3000 in to my 2.4, The acceleration should be pretty ruddy good yah???? So I want a 3.0td unit for a J reg 92 then when the Cylinder head blows I'll just swap the lot? What do you think?? Cash is waiting

If you are going to do that then you will need everything in the engine bay as it is all different.

Rich.

[NiftyNev]

Yup you're right Jim.... The manual gearbox fitted to all diesel Surfs from the mid-'80's to 1999 is a R150X but pre-'91 cars with the 2LT engine have a different clutch, flywheel, and bellhousing to the later 2LT-E and 1KZ-TE engines.

The thing that makes the 3000cc engined cars more economical than the 2.4's isnt the engine. Almost all the 2.4's are fitted with 4.87:1 final drive ratio, the 3 litre is usually 4.30:1

Elvz

I have a 2LT-E with the 4.875 ratio diffs.Will there be any problems if I change to 4.3 ratio.Planning a few long trips and would like better economy and lower engine revs.

My gear box is R151F with the following -
1 - 4.31
2 - 2.32
3 - 1.52
4 - 1.1
5 - 0.83

Neville

[Healewis]

I'm not worried about changing everything to accomodate, I understand that through past experience, I was informed by a Jaguar specialist that I couldn't put a V12 in to a model T ford, so I did. But, what concerns me, is MPG on my everyday runner. I do like the Idea of better fuel economy, which I won't have if I chuck a 3.0td under the bonnet without changing the ratio. Why is life so complicated??? Now I'm gonna have to think of an alternative solution,or am I?