Porsche 924 engine upgrade

pbaerataus · 2018-03-07T13:01:15+00:00

Yes, the b230/b23/21 are all the same motor bellhousing pattern. I presume your custom building the motor anyway as there was no factory b234ft?

Disco_Inferno

Vee_Que;133020 wroteThe daewoo lanos is a beautiful car and one of the most impressive displays of engineering in modern history

Agreed

pbaerataus

Disco_Inferno;133054 wrote (rare and rapidly appreciating)

I think my vehicle is rare but unfortunately I think it stopped appreciation when I did this to it; it's no longer anywhere near stock; this is why is does not concern me to change the motor. If it was pristine OEM then I would totally agree with you.

When and/or if I proceed with the conversion, I will be keeping the OEM engine to go with the car if I ever sell it so someone who wants it original can retrofit it back.

I have researched this for over 12 months and I have looked at a lot of engines:
VW - VR6. VR5. 20v 4cyl. 20v 5cyl. W8.
Rover - V8
GM - 16v 4cyl. 24v V6. LS1.
Volvo - B234 16v 4cyl. B6254 24v 6cyl. B8444 V8.
You are correct - my engine bay is tight....... I'm still researching.

So far I have got to the decision to stay 4cyl and I'm trying to stay away from Jap motor (not that there is anything wrong with them). The B234 just seemed to tick the boxes but I am no expert on "Volvo".

fwiw - the Volvo 16v DOHC will fit although this guy did have to mod his hood:

pbaerataus

One of the other benefits I saw in using the B234 was that the exhaust and Inlets were in the correct orientation for my setup, eg exhaust on drivers side and inlet on passenger side.

A lot of other 16v engines have the opposite orientation setup which make it difficult if I need to slant the motor over.

Ex850R

B8444
B8444
B8444

Essbos

Get known good stock b234, remove balance shafts, replace timing belt and tensioner pulleys, install b234 in porsche, drive everywhere searching for power in the upper stratosphere of rev range with the minimum exhaust muffling.
Would be great fun without compromising drivability.
To increase challenge acquire more peaky camshafts

However, that is a sensible suggestion, and this is the internet.
You must fit a Yanmar diesel & stance it on 22s.

Vee_Que

Fitting a b234 means fitting the wider block, with external pump, so a built b230 with 16v head is the better bet for power upgrades

Dauntless

OM605.

Disco_Inferno

pbaerataus;133066 wrote
Disco_Inferno;133054 wrote (rare and rapidly appreciating)
I think my vehicle is rare but unfortunately I think it stopped appreciation when I did this to it; it's no longer anywhere near stock; this is why is does not concern me to change the motor. If it was pristine OEM then I would totally agree with you.

I'm almost totally into how that looks... I think the only thing that's slightly out of place is the little spoiler, a full 944-sized one would be perfect on there(if you're a fan of not being able to see whatever you're reversing towards).

Orange = win

Ex850R;133077 wroteB8444
B8444
B8444

At that extreme it would make more sense to just go with one of the 32v Porsche V8s to at least stand a chance of fending off the "why no LS1" crowd!

Ex850R

The ls1 crowd is passé, it's all LSX now...

jamesinc

Can we reign in the off-topic commentary on this thread

pbaerataus

Hi Guys.
I’ve made a little progress todate.
Decided to give the 8v to 16v conversion a go. I have purchased a 940 as a donor car to get the B230 shortblock out of and have sourced a B234 head so I can tick those of on the parts list. Next on the list is a Bellhousing and Flywheel/clutch setup.
From my research I should be able to fit a bellhousing from an M46/M47 transmission and a 9” dished flywheel (8 bolt) to the B230 block. Anyone want to confirm that for me.
I will use the Volvo bellhousing instead of adapting the Porsche bellhousing to the Volvo engine.

As the Porsche runs a torque tube/rear transaxle setup, I only need to make an adaptor plate for the bellhousing to mate to the torque tube – as per photos. The only issue with this setup is to find a comparable clutch plate that will fit the Volvo pressure plate/flywheel and fit the Porsche input shaft spline size – 26.3mm x 23T.

jamesinc

The M46/47 bellhousing and 9" stepped flywheel will all fit. If your B230 had an auto behind it originally don't forget to also replace the crank bushing with a pilot bearing.

Edit: one other thing to note is that some M47 bellhousings will have a notch for the crank position sensor used by Bosch LH Jetronic 2.4 ECU found in Volvos from about 1989(-ish) onwards, and others won't have that notch. Otherwise they're identical. The flywheels are the same story, if they came from an LH-2.4 motor they will have notches for the sensor to read, otherwise no notches. If you plan to use Jetronic 2.4, you'll need to make sure you have all that sorted, otherwise you can ignore it (and if you do have a notched bellhousing, either ignore the notch or glue/bolt/weld a cover over it)

Philia_Bear

Slightly surprised the b4204 has not been listed or considered
It revs much better than the b234 and puts out more power stock while weighing 30% less
It also turbos more easily

Dauntless

Philia_Bear;136468 wroteSlightly surprised the b4204 has not been listed or considered
It revs much better than the b234 and puts out more power stock while weighing 30% less
It also turbos more easily

That makes sense, and would be a good match for a light car. Maybe a B5254 would fit?

Vee_Que

I would use a flat flywheel as it's 6kg lighter and you just drill the flywheel to suit your porsche clutch, the dished flywheel is only 230mm so not 9" that would be the flat flywheel. The dished ones have a habit of not gripping well enough.

jamesinc

Vee_Que;136489 wroteI would use a flat flywheel as it's 6kg lighter and you just drill the flywheel to suit your porsche clutch, the dished flywheel is only 230mm so not 9" that would be the flat flywheel. The dished ones have a habit of not gripping well enough.

230mm is 9 inches

Dauntless

Well, 228mm anyway. Hilux clutches are that size, and run a flat flywheel. Not sure if that opens up any options.

Vee_Que

Needs to be porsche spline. Simplest to drill a tti billet unit to match a porsche clutch. The larger the better in this case for a clutch. 9.5"(240mm) is as big as you can go on a flat flywheel as I've done many times for a t5 clutch.

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