My porsche 944 S2 16 valve turbo project
#91
Race Car
Initially, I was thinking of directing swirl. Then I thought it may actually help velocity at low lifts. I guess I hadn't thought it through that far. Hence the question. I am certainly willing to learn.
Now that you guys have giving explanations, I can visualize that it actually would be comparable to having a massive amount of port work while keeping a small valve ei; way too much material removed.
I've been taking a lot of time to convert over to the 4v. One of my concerns was not losing too much bottom end.
It sounds like I need to either go with the longer stroke (already added displacement via bore) or try to go after a quicker turbo.
I guess we shall see how it goes initially with the same turbo.
Thanks again.
Now that you guys have giving explanations, I can visualize that it actually would be comparable to having a massive amount of port work while keeping a small valve ei; way too much material removed.
I've been taking a lot of time to convert over to the 4v. One of my concerns was not losing too much bottom end.
It sounds like I need to either go with the longer stroke (already added displacement via bore) or try to go after a quicker turbo.
I guess we shall see how it goes initially with the same turbo.
Thanks again.
#92
Drifting
There is export documentation that specifies "country of origin," which would list Germany. I don't believe that it would matter where they were shipped from for that purpose.
Actually, I believe you can go and order the pistons online, and get a quote for shipping wihtout committing to buying them.
Actually, I believe you can go and order the pistons online, and get a quote for shipping wihtout committing to buying them.
#93
Drifting
There are but they lost interest when I asked about custom pistons, plus I dont fancy specifying all the dimensions myself.
#94
Race Car
No I shouldn't have to pay UK import duty when the parts originated from within the EU and as long as all the documentation is in order when the parts are in UK customs and with the shipping agent....... I'd be interested in Wossners part no. if the pistons aren't custom ?
It is all right there, too. 2 clicks to get there (from www.wossneronline.com -> Automotive Pistons -> Porsche). If you are SERIOUS, go look on wossneronline. Send an e-mail. Whatever. It really isn't that tough if you are actually looking to get pistons.
#95
Rennlist Member
I got my custom Wossner pistons & rods sent to the UK by Karl at Racer's Edge. It was quite a quick process. Karl asked me for the bore, combustion chamber volume, CR & maximum valve lift. A few weeks later I received Wossner's PDF of the blue prints/technical drawings for my approval. I ok'ed the blue prints & the pistons & rods arrived in the UK about 8 weeks later.
Yes, it is weird & inefficient that we're in the UK, Wossner's in Germany & we need to purchase through an agent in the U.S. - but if that's Wossner's dealership structure I can't change it!
Yes, it is weird & inefficient that we're in the UK, Wossner's in Germany & we need to purchase through an agent in the U.S. - but if that's Wossner's dealership structure I can't change it!
The following users liked this post:
Jay Wellwood (12-24-2023)
#96
Drifting
K9477D_, where the _ is A for standard bore, 050, 100, 150, and 200 are for 0.50mm, 1.0mm, .5mm, and 2.0mm overbore. http://wossneronline.com/forged_pist...roducts_id=968
It is all right there, too. 2 clicks to get there (from www.wossneronline.com -> Automotive Pistons -> Porsche). If you are SERIOUS, go look on wossneronline. Send an e-mail. Whatever. It really isn't that tough if you are actually looking to get pistons.
It is all right there, too. 2 clicks to get there (from www.wossneronline.com -> Automotive Pistons -> Porsche). If you are SERIOUS, go look on wossneronline. Send an e-mail. Whatever. It really isn't that tough if you are actually looking to get pistons.
#97
Drifting
I got my custom Wossner pistons & rods sent to the UK by Karl at Racer's Edge. It was quite a quick process. Karl asked me for the bore, combustion chamber volume, CR & maximum valve lift. A few weeks later I received Wossner's PDF of the blue prints/technical drawings for my approval. I ok'ed the blue prints & the pistons & rods arrived in the UK about 8 weeks later.
Yes, it is weird & inefficient that we're in the UK, Wossner's in Germany & we need to purchase through an agent in the U.S. - but if that's Wossner's dealership structure I can't change it!
Yes, it is weird & inefficient that we're in the UK, Wossner's in Germany & we need to purchase through an agent in the U.S. - but if that's Wossner's dealership structure I can't change it!
#98
Race Car
Didn't know you meant a 3.0L bore piston. Those are not a production part. And note that having made something once does not make it a production part. It still has to go through all of the one-off set up and tooling processes. Designing them is pretty straightforward, but the forging and machining processes is very different for a high volume, batch-run part than it is for a single piece.
On edit - Curious to know why you are so hung up on where they are shipped from? Per Karl, they run about $65 to ship to the UK.
On edit - Curious to know why you are so hung up on where they are shipped from? Per Karl, they run about $65 to ship to the UK.
#100
Drifting
#101
Instructor
Thread Starter
I will keep you informed when things start to happen.
Cheers Tim
#102
Instructor
Thread Starter
I will keep you informed when things start to happen.
Cheers Tim
#103
Nordschleife Master
It's an interesting build so we're happy that you're sharing. I imagine your ignition is pretty retarded to be able to run that high boost on pump fuel without knock and hence the high EGT's.
What rpm and boost levels on the last dyno session?
What rpm and boost levels on the last dyno session?
#104
Instructor
Thread Starter
Running 99 super unleaded pump fuel. Last session at 7500/8000rpm 18/19 psi boost (around 18/20 degrees from memory) 560 bhp. Can not wait to get it back together.