944 Turbo S Engine Rebuild Thread

[PSH]

hmm.. you do realise that even taking the lightest production 951 and the heaviest, we are only talking 100kg difference, which is why I say in this scenario the difference is a moot point.

 

[924Srr27l]

hmm.. you do realise that even taking the lightest production 951 and the heaviest, we are only talking 100kg difference, which is why I say in this scenario the difference is a moot point.

Eldavo : I don’t really see any 944T hitting much more than 180mph without big power and a different gearbox.

I agree on this.......

All this pub talk Pete:
- "I have driven well past 170mph (btw, that was with only 282 bhp) "
- "He has two 951's, one is modified for the track, more power than mine but on banked circuits, he has seen it log 200mph."
- "he said the '86' 951 is the best car that Porsche has ever built"

R

 

[PSH]

If you owned one, you would understand just how good they really are and I'll leave it at that...

 

[924Srr27l]

Pull the other one,Roger-momentum doesn't propel a vehicle-but helps a vehicle sustain its speed all things being equal.
If your theory were to be true ,how come Colin Chapman didn't make his designs as heavy as possible.
Why are Single seater racing cars so light -why not race trucks ???????

Lotus Elise S1 1.8L 116bhp 750kg top speed 126mph (155bhp / per ton)
Vauxhall Vx220 2.2L 145bhp 945kg top speed 135mph (165bhp / per ton)
Porsche 944 T 2.5L 217bhp 1350kg top speed 152mph (160bhp / per ton)

The super light car's handle and accelerate very well, all 3 examples above have very similar power to weight ratios,
but the 2 lightweight Lotus chassis cars are down on the top speed figures, the heavier German 944 is 80% heavier
than the S1 Elise and hence this MASS allows it to have a higher top speed..


R

 

[924Srr27l]

If you owned one, you would understand just how good they really are and I'll leave it at that...

I did try really hard, and tested one (220 model) to buy from www.autographspecialistcarsltd.com/cars-for-sale
It didn't drive that nice and just didn't feel that quick but I've driven up from Milton keynes to Wakefield in my Daily
a Volvo T5 225bhp 2.3 estate and that did go well for a barge....

I drove another years later this time my daily was a 968 3.0 and again it just wasn't happening...

R

 

[PSH]

Pull the other one,Roger-momentum doesn't propel a vehicle-but helps a vehicle sustain its speed all things being equal.
If your theory were to be true ,how come Colin Chapman didn't make his designs as heavy as possible.
Why are Single seater racing cars so light -why not race trucks ???????

Lotus Elise S1 1.8L 116bhp 750kg top speed 126mph (155bhp / per ton)
Vauxhall Vx220 2.2L 145bhp 945kg top speed 135mph (165bhp / per ton)
Porsche 944 T 2.5L 217bhp 1350kg top speed 152mph (160bhp / per ton)

The super light car's handle and accelerate very well, all 3 examples above have very similar power to weight ratios,
but the 2 lightweight Lotus chassis cars are down on the top speed figures, the heavier German 944 is 80% heavier
than the S1 Elise and hence this MASS allows it to have a higher top speed..


R

You can't just go by weight here.. there are many other factors to consider, gearing by just one of them, btw... looks like you are using the US figures here for the 944T... UK figures for 86 are 220bhp and 1280 kg

 

[PSH]

hmm.. you do realise that even taking the lightest production 951 and the heaviest, we are only talking 100kg difference, which is why I say in this scenario the difference is a moot point.

Eldavo : I don’t really see any 944T hitting much more than 180mph without big power and a different gearbox.

I agree on this.......

All this pub talk Pete:
- "I have driven well past 170mph (btw, that was with only 282 bhp) "
- "He has two 951's, one is modified for the track, more power than mine but on banked circuits, he has seen it log 200mph."
- "he said the '86' 951 is the best car that Porsche has ever built"

R

oh.. I guess that I should answer this one, I was just going to ignore it. I try to verify anything that I say, so:
the 174mph was logged by GPS and the car was still pulling/accelerating hard at the time, no possible speedo error.
The details about the guy with the two 951's and the 930 describing what he thinks is the best Porsche after owning 40+ Porsches was published in the 'Excellence' magazine 2019.

Was he partaking in 'pub talk' too? I think not.

 

[Eldavo]

Anyway, bit more progress made. Firstly got the exhaust manifolds on and then the rest of the exhaust crossover, etc. all tightened up and sealed etc. Upgraded the Wastegate vacuum lines to the solenoid and then a few other things.

More clarting about with wiring and then got all the coolant branches and connections on - I’ll be amazed if there isn’t at least one that needs a bit of a nip up when up to pressure I always forget just how many there are. Connected up the inlet tubing too and replaced the metal vacuum tree under the manifold with some silicon piping as I was only using the AOS to inlet pipe anyway.


One last coolant connection to go in and then the heater pipe too, inlet manifold, etc. next.

 

[Eldavo]

Also, these new manifold studs with an Allen head in the ends were a joy to use compared to the rigmarole of double nutting the original ones.

 

[PSH]

Looking good David... yes those studs make life a lot easier, I don't think that I have them on the manifold although do recall seeing them somewhere, perhaps on one of the engines that my son has built/building?

keep up the good work

Pete

 

[Eldavo]

So there I was installing my phenolic inlet manifold gaskets . . .

 

[Eldavo]

When a delivery turned up:

 

[Eldavo]

First impressions are really good, lobes are visibly bigger and machining work is excellent. now to get the cam box built back up!

 

[Eldavo]

Getting close now - engine start should be next week. Just ordered the bit’s and bobs I need to go wasted spark too.

 

[blade7]

From Peep?

 

[Eldavo]

Nope. I didn’t configure my VEMS unit for Wasted Spark when I bought it so unfortunately will have to wire it in myself. The coilpack is about £30 and I’ll need to run another 2 core cable run from the ECU to the coilpack and then take the 12v connection from the old coil wiring.


Will be a job for a few weeks time though as don’t want to introduce too many variables until it’s running and been for it‘s MOT.

 

[blade7]

Don't think it comes configured, even when Peep supplies the WS. He supplies new HT leads with the kit too.

 

[Eldavo]

I‘m planning on mounting it where the dizzy goes so can probably reuse my leads. If not there’s a guy in Shrewsbury who makes custom leads up and sells them on eBay under "Mr Retro Leads”.


I managed to finally snap the wire to the auxiliary pump thermostat today too, it’s been hanging on for dear life. Just about enough of a nub to solder onto them 4 layers of heatshrink to support it and hide my soldering sins!

Will patch the flying lead into the harness on Monday.

 

[blade7]

I'd wonder about vibration and heat soak, mounting the coil pack on the engine.

 

[Eldavo]

It’s a Bosch MotorSport item which states it can be attached to the engine.


https://www.finjector.com/documents/550bedaf32fb6/Double_Fire_Coil_2x2_Datasheet_0221503407.pdf

I know racers using it in place of the Dizzy and they’re doing 45 minute races without failures. Let’s be honest, the Dizzy doesn’t really get that hot anyway. I’ll mount it on a plate that will act as a heat sink of sorts too.