My porsche 944 S2 16 valve turbo project
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Rob pulled the plug late last year. He got married and was expecting his first child. We were actually getting close to putting it all together, but he just didn't want to spend anymore and with the current 944 market he wouldn't be able to sell it for anywhere near the cost.
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4V turbo pistons will be custom. Wossner now makes the 2V turbo pistons as a standard item, which drops the price several hundred bucks.
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Harry, Chris, Duke... And others.
I'm curious of your thoughts on having a custom intake cam that would delay the opening of one valve? Idea is to keep port velocity up at low lift. Speaking 4v of course. This is using an s head and on a 3.0 with a 105.5 bore.
TIA
I'm curious of your thoughts on having a custom intake cam that would delay the opening of one valve? Idea is to keep port velocity up at low lift. Speaking 4v of course. This is using an s head and on a 3.0 with a 105.5 bore.
TIA
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Rob pulled the plug late last year. He got married and was expecting his first child. We were actually getting close to putting it all together, but he just didn't want to spend anymore and with the current 944 market he wouldn't be able to sell it for anywhere near the cost.
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I never did get a reply from Wossner when I asked about Alusil compatible 104.5mm pistons, it seemed Wossner had an arrangement with one or two US retailers for exclusive supply. Buying from the US adds almost $400 duty/tax/postage and Lindsey said even if I bought from them Wossner refused to ship direct to me
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Try www.wossneronline.com. It is owned by Racer's Edge. He ships woldwide, usually through USPS, and it isn't anywhere near $400.
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Email sent Harry.
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WOssner doesn't ship directly. They have distributors, which is a pretty common practice. If they were out there competing with their dealers getting twice or more of the margin, they wouldn't have any dealers.
Try www.wossneronline.com. It is owned by Racer's Edge. He ships woldwide, usually through USPS, and it isn't anywhere near $400.
Try www.wossneronline.com. It is owned by Racer's Edge. He ships woldwide, usually through USPS, and it isn't anywhere near $400.
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You'd think there would be a UK agent for Wossner? Even so, if you had to order it from Racers Edge and they request that the package gets sent direct to the UK?
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What you want in port velocity is to get a higher velocity for the same flow rate. A well designed smaller port will flow the same volume as a large poorly designed port (this is where you have to watch out for people that just post CFM numbers from a flow bench). The smaller port design will typically have higher flow velocities and it will be a better performer.
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At the end of the day, Wossner doesn't deal with individual piston orders, so what makes sense to an end user may not make sense to Wossner. If 90% of one piston is sold in one country, it may make more sense to just stock all of them in that country, rather than try to balance things.
Conflict of interest is that it is in a manufacturer's best interest to have a dealer network. But if said manufacturer plays the role of dealer, it is in a position to drive the competing dealers out of business, because they are able to do things the dealers can't. Doesn't have anything to do with shipping.
Actually, I believe you can go and order the pistons online, and get a quote for shipping wihtout committing to buying them.
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Keep in mind that for cam events, peak flow is most critical for intake, and low lift flow is most critical for exhaust. You'll be mach limited in the low flow region (at higher RPM) unless you have way too much cam, any way you slice it. You make up for that at high lift.
On the exhaust side, your highest delta P is at EVO, and you want to get as much of that spent gas out of the chamber as quickly as you can, so EVO is critical. That's one of the reasons you see some 30, 35, 37, and 40 degree exhaust seats - it increases the area available for flow at low lift. But you don't see that on intake ports very often.
What you are really after is an IMRC or a CMCV - Intake Manifold Runner Control, which closes off one port at low RPM. Or a CMCV, which is a Charge Motion Control Valve, which blocks part of a port at part throttle. The IMRC is better at what you are trying to do.