944 2.5 cnonversion to 3.0 back to 2.5

[binsie2003]

Hi,

My neighbour has recently acquired a late (1988) 944. Which has had a 3.0 installed due to a previous engine disaster. The 3.0 litre has now also expired with a broken cam belt. I am told the original conversion included the trany and most probably the DME???

The plan is to donate a strong 2.5 engine, trany and 2.5 DME to return the car to its original 2.5 state.

Questions:

Would the DME at the time of the 3 litre conversion have to have been changed due to the different engine management requirements?

If so would this have entailed chopping any of the DME wiring or is it plug and play?

Would there have been any mods to the engine wiring in the engine bay?

Is the throttle cable going to have to be changed back for the 2.5?

I'm sure there are more questions I'll post as I go. Anyone who knows about how this has been done please chip in with any useful info and words of encouragement!

I look forward to hearing from you :0)

Regards

Steve

[LarJammer]

I have done the swap on a 924. The dme is completely different, as are some of the sensors. I would guess the engine wiring loom has also been changed (or modified). The flywheel is also different.
I may be able to rehome the 3.0 engine depending on how damaged it is.

[LarJammer]

Yes, the throttle cable is different, along with some of the coolant system.

[blade7]

binsie2003 said:

Hi,

My neighbour has recently acquired a late (1988) 944. Which has had a 3.0 installed

Are you sure...

[LarJammer]

blade7 said:

Are you sure...

Good point! We need pics (or an engine number)

[binsie2003]

I know a 3 litre twin cam when I see one

[blade7]

binsie2003 said:

I know a 3 litre twin cam when I see one

Do you know a 2.5 16v when you see one...

[mollytherocker]

blade7 said:

binsie2003 said:

I know a 3 litre twin cam when I see one

Do you know a 2.5 16v when you see one...

Porsche didnt make a 2.5 16v. There is the 2.7 and then the 3.0 in the S2 and the 3.0 in the 968.

[Richair]

mollytherocker said:

Porsche didnt make a 2.5 16v. There is the 2.7 and then the 3.0 in the S2 and the 3.0 in the 968.

They did, the first 944s was a 2.5 16v.

[speedyman]

Richair said:

mollytherocker said:

Porsche didnt make a 2.5 16v. There is the 2.7 and then the 3.0 in the S2 and the 3.0 in the 968.

They did, the first 944s was a 2.5 16v.

They did indeed, I know because I had one. The 944 S1 was built from 1986 to 1988, follow on model was the 3.0 16v 944 s2

[Richair]

speedyman said:

Richair said:

mollytherocker said:

Porsche didnt make a 2.5 16v. There is the 2.7 and then the 3.0 in the S2 and the 3.0 in the 968.

They did, the first 944s was a 2.5 16v.

They did indeed, I know because I had one. The 944 S1 was built from 1986 to 1988, follow on model was the 3.0 16v 944 s2

Oh and just to close the loop on this, the 2.7 was an 8v.

[mollytherocker]

Well, I stand corrected. I thought the 944S was a 2.7, but yes it was a 2.5.

[binsie2003]

Richair said:

speedyman said:

Richair said:

mollytherocker said:

Porsche didnt make a 2.5 16v. There is the 2.7 and then the 3.0 in the S2 and the 3.0 in the 968.

They did, the first 944s was a 2.5 16v.

They did indeed, I know because I had one. The 944 S1 was built from 1986 to 1988, follow on model was the 3.0 16v 944 s2

Oh and just to close the loop on this, the 2.7 was an 8v.

He's right you know, and an engine number will tell me all I need to know.

I only run a M44/50 engined Turbo myself, never been a fan of the 16v set up. Its my neighbours project I'm just lending an eye and hand!

[blade7]

binsie2003 said:

never been a fan of the 16v set up.

I am.

[Richair]

blade7 said:

I am.

Oh baby. Is this yours?

Would like to do this one day, but that's waaaaaaaaaaaaay off.

[blade7]

Unfortunately not, that belongs to Turbotim. There's a long thread about it on PCGB and Rennlist.

[Richair]

Right oh, I've clearly missed that. Some bedtime reading at some point then, thanks.

[GC8]

binsie2003 said:

He's right you know, and an engine number will tell me all I need to know.

I only run a M44/50 engined Turbo myself, never been a fan of the 16v set up. Its my neighbours project I'm just lending an eye and hand!

Id be interested to see this, along with the build sticker, VIN and date of production if you have it.

[GC8]

I will venture a guess that it is a 3.0l engine, because 2.5l 16v engines have always been in short supply (well, heads anyway) due to their lack of durability. S2s revved less and as a result more survived.

In the mid-nineties Ss were dropping like flies.

Yes the DME is different: the S and the S2 use a slightly more advanced version of Motronic.

[speedyman]

The early problems with the s1 were mainly due to the cam chain tensioner being a non maintenance item and failing. Soon as I got my car when it was 13 years old and 49k on the clock was change it, Plus all belts and tensioners. Belts and tensioners were replaced at three year intervals after that. By the time the s2 was on the scene this issue was more understood by owners who followed this as a maintenance schedule.