[pjalexandre]

My sponsor SportsCarShop (Scott Z) is putting together a prototype belt driven dry sump for me. He will be sorting things out on either a Spec Boxster and/or Cayman S race car.

What is the interest level here on something like this?

To be sold as a kit for your shop to install or installed by SportsCarShop in Virginia. Basically it is not for your "average" DIYer.

For discussion sake let's say this costs a little more than double what you would pay for an Accusump and would likely include enhanced oil cooling.

This application uses the pulley location for the AC so for a street application you lose AC. More intended for dedicated track cars / race cars.

For PCA Club Racing the rules would need to be adjusted to allow for additional methods of protecting the engine instead of simply naming the Accusump. This in no way increases HP in any way on the M96/M97 engines. This is purely for providing additional oil scavenging and delivery a steady pressured stream of cooled / defoamed oil.

[Ryan]

Interested if approved for PCA CR. Might want to shoot email to rules commitee before June 1 for proposed change. That's when period ends for rules submissions for next year

[smdubovsky]

Originally Posted by pjalexandre

This in no way increases HP in any way on the M96/M97 engines. This is purely for providing additional oil scavenging and delivery a steady pressured stream of cooled / defoamed oil.

If it in any way reduces foaming from crank whip (which I don't see how is NOT possible if emptying the case of oil) it will increase hp. Every test I've ever read of adding a dry sump has added measurable hp. If the M96/97 case was so good at preventing whip in the first place, you wouldn't need accusump/dry sump conversion kits, right?

[pjalexandre]

I am trying to solve a problem not sneak in some HP. This will actually "use" Hp to drive the oil pump.

The M96/M97 suffer from lack of oil scavenging in the heads due to only having 2 scavenge pumps. There was a factory x51 oiling mod for the Euro M96 3.4 that added two additonal scavenge ports on the heads.

L&N is now offering essentially a replica of that kit today. We looked at that route and figured why not just externalize the oil tank and make a true dry sump out of this....

Your argument is based on there being oil in the pan and getting whipped up by the crank. The current OEM design doesn't suffer from that already and frankly there is never even enough oil in there to get whipped up. Thus the problem we are trying to develop a solution for. Your input is welcome.

[pjalexandre]

I already sent a proposal to Walt @ PCA about this.

[pjalexandre]

As for removing the oil from the case... This proposal is no different than the current extended oil pan designs that place the oil in a lower pan that is mostly covered from above and extend/submerge the oil pickup tube into this lowered oil pan. The area above is now vacant of oil. Instead of putting the oil into a flat thin pan under the engine where it can get hurt we are putting it in a vertical tank out of harms way.

[LPM911]

If there are no issues with legality in any racing series, then seems like this would generate some interest. Not having this motor, I haven't done much research, but is the accusump the current solution to the problem? Does the accusump fully solve the problem? If so, I can't see people spending twice as much unless it offers something extra.

[pjalexandre]

The Accusump is one of the current bandaids. Many feel it doesn't solve the problem. I'll leave that debate for elsewhere. I have made my own decision regarding the Accusump with discussion with several experts. I am not the expert.

An Accusump is and oil accumulator. It accumulates and stores 3 qts ( you can get different sizes) under pressure and if there is a drop of oil pressure from the engine it dumps the 3 quarts into the engine and then as oil pressure builds again the Accusump reclaims it's 3 quarts and holds them again for the next loss of oil pressure.

The benefits of a Dry Sump are pretty clear. A constant supply of oil pressure. This also fixes the lack of oil scavenging from two locations in the heads.

The Dual Scavenge Pump solution from TTP or L&N cost $2-3K plus the install. The extended oil pans end up between $500 to $1K. The Accusump is $1500

Originally Posted by LPM911

If there are no issues with legality in any racing series, then seems like this would generate some interest. Not having this motor, I haven't done much research, but is the accusump the current solution to the problem? Does the accusump fully solve the problem? If so, I can't see people spending twice as much unless it offers something extra.

[roundel]

Is the Dual Scavenge Pump intended to supplement the existing oil system or replace it. I would be concerned about the result of a failed belt if this system replaces the OEM oil system.

[good hands]

I would be interested after some extensive testing.

Have the new crate motors addressed the problem in any way ?