924Board.org

[Euro924S2]

Sure it's been discussed before but again the search function gives no answers.

Obviously I'll need to change the crossmember for a 24s or 44 one and then fabricate some brackets to go from the block etc but has anyone done this and if so, was the hydraulic damping worth all the effort? Also, with the 44 crossmember, can the engine be lowered, or does it have to stay the same height?

I'm fitting a 944 power steering rack anyway so no bother there.

Cheers, John.
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp

[ideola]

I think it was ic932 that has a writeup in the engine swap section on this mod. In addition to the front cross member, you might also need to cut out the rear early-style engine mount brackets, as they may interfere with the 2.5L motor.
_________________
erstwhile owner of just about every 924 variant ever made

[Rasta Monsta]

Raceboy used an early crossmember to mount a 2.5. Do a search.
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[Euro924S2]

Sorry, maybe not made my intention clear. I'm keeping my supercharged 931 engine but looking at engine mount solutions. One option is vibra tech ones, or just keep my perfectly ok stock ones, but I was reading in a Porsche history book that the hydraulic one fitted to the 944 were a huge improvement - but obviously a lot of the smoothness will be from the balance shafts so I'm just trying to find out anyone's experience, both in mount function and installation headaches!

So my question was really, Has anyone fitted the 944 engine mounts to a 931/ 924na engine? Like I say, done a search but just reams of other topics rather than anything on this.

Cheers. John
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp

[Rasta Monsta]

Aha. Doesn't seem like a good swap. . .the 931 hangs from its mounts while the 2.5 sits on them, and the only 2.5 mounts worth using (OEM 951 units) are insanely expensive.

I am running the Vibratechs, and they are harder than stock, so no joy getting less vibration out of them.
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[leadfoot]

I did a how to on retrofitting an engine shock/damper, I did this after fitting the sc and was getting noticable vibration through the accel pedal, it was also to control engine torque/vibration as the sc was not too far away from the frame rail and the intake manifold was also close to the brake booster...
The other thing you can do is to inject urethane into the stock hanger (non spring mount) if you want to stiffen it up a little
stu
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

[kcoyle]

[Rasta Monsta]

Yes, the "road" ones are pretty stiff.
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[Euro924S2]

Interesting to hear the road version are pretty hard. I'd heard they really improve the feel of the car in the corners since they tighten everything up, but if vibration on cruise is increased then that will detract from the GT nature of the car I like at present.

I realised the 931 hangs from its mounts, but I was thinking of making new brackets so it would 'sit' on the 944 ones as intended.

I was hoping the 944 ones would damp the vibration but keep everything tight in the turns.

Rasta - would you say for street use the road VT ones are better or worse than a good set of OEM ones?

Lead foot: I need to check out your how too. Tbh I don't have any problems with anything hitting etc I'm just keen to make the car feel 'well bolted together'.

Thanks for the input guys. John
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp

[Cedric]

[kcoyle]

[ideola]

Yes, if you have a means to lift the engine (cherry picker or hoist).

If you want a set of the VT mounts, I am setup as a US reseller for them.
_________________
erstwhile owner of just about every 924 variant ever made

[Rasta Monsta]

I tried hard to replace them in the car. Yes, I am a big pansy, but I could not budge the hex bolts that hold the mounting "arm" to the block on the passenger's side.
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[ideola]

I don't understand why you need to remove the mounting arms to swap the motor mounts? It should be as simple as getting the lift on the engine lifting points, hitting the two top nuts and the one bottom nut with an impact gun on each side. Lower motor to clear the two stud posts on top of the motor mounts. Remove old motor mounts. Install new motor mounts. Lift motor back up. Reinstall nuts.

I could be forgetting some important points, but there should be enough play in the torque tube tunnel to lift and lower the engine enough to do this. What I'm not sure about is whether the exhaust components or water hoses might need to be disconnected. The last time I used the above method was on the new engine install for the 941...
_________________
erstwhile owner of just about every 924 variant ever made

[Rasta Monsta]

So you have actually pulled this off? It was years ago, but at the time I concluded that the arm would have to come off. I could be wrong, but I was quite determined to install the damn things and I usually don't give up easily.

Perhaps it had something to do with the length of the studs coming off the VT mounts? Or the pan hitting the cross member?
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3