My plan

[Bigdog]

As you are all probably aware I am doing a 1970 series 2a 109 ex military with a 2 1/4 diesel, I have recently purchased a really nice 2 1/4 petrol engine, so what I am thinking is leaving the 109 as is and keep the petrol engine if I can get a series 2a 88 as my next project that doesn't have an engine and put the petrol engine in it, I also have got a fairly overdrive which I would probably keep and put it with the petrol engine, decisions decision's 🙈🙈

[cswagon]

Just my thoughts but I'd put the overdrive on the 2 1/4 diesel which would make it a lot more user friendly. I wouldn't want to drive my 109 diesel without one on it. The petrol will be reasonably quiet without one, if you can live with the fuel consumption.

[Bigdog]

Yeah that could work, appreciate your thoughts, what does everyone else think 👍

[VOD80]

I don't have experience of an overdrive but I can say that my diesel 109 really feels like it is a gear short of a full box - driving at 50mph feels like you are thrashing it!

If I had the chance and the money, I'd probably put an overdrive on.

Cheers, Tony

[Alan Drover]

I've had an overdrive on my Series 3 for about 30 years and wouldn't be without it. I use it as a fifth gear and very occasionally a splitter gear between 3rd and top.

[autorover1]

Ditto. I once had a S3 88" Diesel & found it would pull well in O/D even on 7.50 x 16 tyres . Happily sit at an indicated 70mph on the motorway without feeling stressed .

[stevesharpe]

I have a Fairey overdrive on my 1961 swb petrol(and yes it really does lower engine revs) but I find it very noisy as the speed builds up
Does anyone have a cure or are they all this noisy?
Steve

[Alan Drover]

Mine's relatively quiet and always has been. It was rebuilt before I bought it about 30 years ago.
It seems some are quiet and some are noisy.

[Davidss]

I have a Fairey overdrive .... but I find it very noisy as the speed builds up
Does anyone have a cure or are they all this noisy?

The cure I've seen mentioned, but never tried, is to replace the EP90 with thicker EP140, but I don't have a guaranteed method of making the EP140 runny enough to run through the filler. Presumably heat is involved.

Regards.