Boring and Stroking...

[Mr Cerbera]

Sorry Team,

I was just looking at my "Owner's Maual" in orer to try and get some dimensions for an article that I'm doing and the figures quoted in it are complete .

Do any of you know the Bore and Stoke dimensions for the 4.2 and the 4.5

Ta !

Mr. Dummy

[Steve_T]

4.5: 91mm bore, 86mm stroke iirc

[Mr Cerbera]

Steve_T said:

4.5: 91mm bore, 86mm stroke iirc

Cheers Steve, that's what it says in the handbook too.
Strangely enough it quotes larger dimensions for the smaller engine:-
4.2: 94 bore, 91 stroke.

There is some puzzlement

[Y194 ODX]

Hi Mr. Cerbera,

according to my handbook from 2001:

4.5: 91x86 - 4.475 cc in total (seems correct)
4.2: 94x90 - 4.997 cc in total (definitely nonsense)

[Mr Cerbera]

Oh well, Glad to see that there's some (in)consistency

My maths is crap but I thought that the volume of a cylinder was
(Pie x R squared) x Bore

So for 94 x 90 = 4,998 ltrs
and for 91 x 86 = 4,476 ltrs (Presumably the 4.5 Ltr)

What have I missed ??

Edited by Mr Cerbera on Tuesday 11th September 20:36

[Y194 ODX]

http://carsspecifications.com/auto/tvr/cerbera/cer...

gives 4.181 cc

[Mr Cerbera]

Y194 ODX said:

http://carsspecifications.com/auto/tvr/cerbera/cer...

gives 4.181 cc

Cheers Ulf - You're a Star !

[longbow]

Its 88mm bore and 86mm stroke for the 4.2 AJP8....

[ [8.8 x 8.8 x Pi]/4 x 8.6] x 8 (cylinders!) = 4184.5cc

The stroke is the same as the 4.5, the only difference is the wider bore of the liners. 4.7 bores are wider still.......

[Y194 ODX]

longbow said:

Its 88mm bore and 86mm stroke for the 4.2 AJP8....

[ [8.8 x 8.8 x Pi]/4 x 8.6] x 8 (cylinders!) = 4184.5cc

The stroke is the same as the 4.5, the only difference is the wider bore of the liners. 4.7 bores are wider still.......

mea culpa! my knowledge about the 4.2 engine seems crap

[Mr Cerbera]

longbow said:

Its 88mm bore and 86mm stroke for the 4.2 AJP8....

[ [8.8 x 8.8 x Pi]/4 x 8.6] x 8 (cylinders!) = 4184.5cc

The stroke is the same as the 4.5, the only difference is the wider bore of the liners. 4.7 bores are wider still.......

Forgive my stupidity but why are you dividing by Four ??

[clive f]

definately 88mm bore on the 4.2

[Tanguero]

88mm is the bore diameter rather than the radius.

volume of a cylinder from radius = pi * r^2 * h
or
volume of a cylinder from diameter = (pi * d^2)/4 * h

Radius = 4.4cm
pi * 4.4^2 * 8.6 = 523.06cc
8 cylinders
523.06 * 8 = 4184.5cc

[Mr Cerbera]

Thanks all for all your advices

Edited by Mr Cerbera on Friday 14th September 17:31

[TVR Beaver]

Just FYI.. 94 x 90 is the V8 Rover dims on the 5 Ltr cars good old cut and past what!!