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Converting B5204T to B5234T

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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jeffsws
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Converting B5204T to B5234T

Post by jeffsws »

First of all, please excuse my ignorance.

Italian T5 engines are 2.0 with a shorter stroke of 77 mm compared to 90 mm on the 2.3 engine. I'm not sure what actually determines that. Is the cylinders longer on the 2.3 or is it determined completely by the piston stroke? Which would mean the only difference between the two engines is the crankshaft? My suspicion is that it's not that simple but any insight would be great.

Cheers for the help!
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Re: Converting B5204T to B5234T

Post by precopster »

Stroke is totally determined by the crank throw. The longest cylinder in the world still has the same capacity if the same crank is used.

It would be silly for Volvo to have more than 2 different block styles. They have the T5 block and the NA/2.4T block. Heads are shared.
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Re: Converting B5204T to B5234T

Post by jeffsws »

I found that the crankshaft and pistons are different. The connecting rod is the same. As is everything else with the possible exception of the flywheel. I need to look more into that.
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Re: Converting B5204T to B5234T

Post by precopster »

Best is to find a copy of Vadis or a later Vida version and compare all the parts. Afew years ago I did some digging and found that the 10 valve and 20 valve engines have the same block, conrods and crank.

If you use the formula V=π*R2*h where R is the bore/2 and h is the stroke you can work out the volume of each cylinder and multiply X 5 to get total capacity of the engine.

Once you have determined that bore is the same between Volvo engines they tend to share the block and have different crankshaft if lower capacity
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Re: Converting B5204T to B5234T

Post by jeffsws »

Thank you! I did just that and got Vida set up; it appears the flywheel is the same. I've yet to find any other internal engine differences as of yet. However the turbo is smaller - it's a 13g.

Just for reference here are the part numbers:

Crankshaft
2.0 = 9189283
2.3 = 9189284

Neither are available anymore, so I'll need to find one at the junkyard.

Piston kit
2.0 = 272311 (O.S 0.40mm)
2.3 = 272307 (O.S 0.40mm)

Volvo no longer offer any 2.0 piston gear but they do still offer 2.3, so I'm really forced to upgrade if I ever do a full rebuild of the engine. Alternatively, if I decided to keep it 2.0, I'd need to find an aftermarket (or OEM) pistons. I've no idea where I would find them.
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Re: Converting B5204T to B5234T

Post by RickHaleParker »

precopster wrote: Wed Jan 16, 2019 1:06 am If you use the formula V=π*R2*h where R is the bore/2 and h is the stroke you can work out the volume of each cylinder and multiply X 5 to get total capacity of the engine.
Displacement = π/4*Bore²*Stroke*Number of cylinders = 0.7854 * Bore²*Stroke*Number of cylinders

The B5204T has a Bore of 81mm, stroke of 77mm and five cylinders.

0.7854 * 81mm²*77mm*5= 1983908.619 mm³ = 1.984 L. Rounds to 2.0 L.
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Re: Converting B5204T to B5234T

Post by polskamafia mjl »

RickHaleParker wrote: Fri Jan 18, 2019 7:34 pm
precopster wrote: Wed Jan 16, 2019 1:06 am If you use the formula V=π*R2*h where R is the bore/2 and h is the stroke you can work out the volume of each cylinder and multiply X 5 to get total capacity of the engine.
Displacement = π/4*Bore²*Stroke*Number of cylinders = 0.7854 * Bore²*Stroke*Number of cylinders

The B5204T has a Bore of 81mm, stroke of 77mm and five cylinders.

0.7854 * 81mm²*77mm*5= 1983908.619 mm³ = 1.984 L. Rounds to 2.0 L.
Those are the same formulas. :roll:
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Re: Converting B5204T to B5234T

Post by precopster »

Exactly.
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Re: Converting B5204T to B5234T

Post by RickHaleParker »

"V=π*R2*h where R is the bore/2 and h is the stroke"

Where R=81mm/2 = 40.5mm, H=71mm & number of cylinders = 5.
V=π*40.5mm*2*71mm*5 = 90336.497mm³ = 0.903L. rounds to 0.9L not 2.0L

If by R2 you meant R^2 or R²

V=π*40.5mm²*71mm*5 = 1829314.059mm³ = 1.829L. Rounds to 1.8L not 2.0L
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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Re: Converting B5204T to B5234T

Post by precopster »

The keyboard I have doesn't express to the power of, so R squared was what was intended.

I used Google for the formula for volume of a cylinder without testing it.

No harm in correcting though....
Current cars:2002 XC70, 2006 Ssangyong Rodius (Stavic), 2006 XC90 2.5T, VW Transporter 2.5TDI

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