Bigfoot928

I have a pair of 1990 928 heads modified to use the variocam from the 968 for sale. Ported for and includes 968 intake valves. Intake ports ported to match the larger 968 intake gaskets. Includes Intake port matched to the heads.

These did run in a 928 for almost 30K miles and do work. Also includes the billet cams specially made for the variocam and the 928.

Includes 968 cam covers as well. The cam tensioners need new pads and the whole setup should be disassembled and cleaned.

This set up cost me well over 10K to develop years ago, and it is the only setup like it in the world.

$2000 plus shipping.

Speedtoys

Im only a curious onlooker, dyno data?

The Fixer

+1

fraggle

I remember this setup from a SITM, long ago. Wish I had a spare $2000, these would make a neat fit on my high-comp motor.

Bigfoot928

the only dyno data was the complete stroker build, and I'd have to dig up the dyno data. It was 515 hp and 495 torque. It was a very low revving engine, with peak HP at 5800rpm due to the variocam, the torque was very flat. 400 ft lbs from 1600 all the way to 5800. peak torque was from 3800 to 4900 rpm, so it was a very fun ride... driving along at 3200 rpm in 3 gear, and stuff the gas pedal to the firewall, and this was at around 60 mph it would break the tires loose....

SwayBar

What are the specs for the cams?

Can they be run without the vario-mechanism? For example, on a racecar timed for top-end horsepower, or would they sacrifice too much low-end as a result?

Bigfoot928

the cams and timing are part of the variocam secret sauce... running them without variocam would be a waste of time. its a package deal... keep in mind that variocam was designed to make a small motor act big on torque....

There is a very narrow market for these bits.... at one time I planed to buy another S4, fly cut the pistons for the intake valves and see what it would do.... I think it would be a cheap stroker..... and of all the people on RL and other forums.... there would only be 3-4 people that could buy this collection of parts and do something with it. I can give some basic instructions but for this price endless tech support to make it work isn't worth it for me....so I may end up taking all this stuff to the smelter for scrap prices...

ptuomov

I don't want to speak for Sterling, and he can confirm this, but I think he's going with much longer duration cams in his new build to take advantage of the titanium short block parts and the ITBs. From what I've heard, these variocam cams are not for high-rpm use, instead they are something that pairs up with the ported stock manifold in terms of the rpm range.

As Ake says, many of us think that the 968 port size is too large for most uses. It's hard to think of a combo that uses a ported stock intake manifold and for which that size would be ideal. But not being ideal by someone's opinion doesn't mean that they aren't making a lot of torque and power.

To optimize the intake manifold and the heads, one could fill the bottom of the port and the corresponding area in the intake manifold. That might be just the ticket for us that like high air speeds. Potentially a lot of value there for $2000, if you can make the modification.

Another use for this combo (with or without filling the port floor) could be in a turbo motor. There are some exhaust effects in a cross-plane V8 that make the variocam potentially very useful. Basically, retarding the intake at 5000 rpm or so to reduce overlap and make the IVO later may be just the ticket to mitigate the 90-degree interference problem between cylinders 5&6 and 1&3. With that problem cured, the turbos can run this cams-heads-intake combo into very high rpms if so desired.

The one question that I have is how well do the variocam pads and the system work on the driver side? I think (but do not know) the drive mechanism rotates in the opposite direction from what it does on the 968. Does it work equally well on the tension as well as on the slack side of the cam chain?

SwayBar

Thanks for the input.

Bigfoot928

this was a very expensive experiment.... to say the least..... yes I am moving in a very different direction.... however this is a deal of the century when it comes to what the buyer is getting....maybe now someone with more money and newer technology can get more out of them.... there are quality parts in this set..... billet cams 968 ported heads, 968 variocam tensioners are over 1K each... I have some ideas how to make more power with this setup but they are only ideas and wanted to go in another direction with a more linear power curve. this setup was actually somewhat violent or brutal when used full throttle....

Bigfoot928

Just to give an idea, this was the 1st set of billet cams made anywhere as far as I know, and just the cams were 8K....

The Fixer

Sterling, i looked at you website but the status page was quite old

How's the car coming along?, I haven't seen the hood or anything..

Bigfoot928

I will update the site soon.

jeff spahn

Wonder how this would work on a s/c car......?

BC

That's a long road Sterling.