Easy 300hp for your 911

[BoxsterGT]

This is not cheap, so I don't know if anyone else may be interested, but we have started a job this week on installing a 300hp 996 motor in a customer's 911SC.

It means converting the chassis to water cooling. Not such a big deal since the V8 guys have done so much on this already.

A fresh 300hp 996 motor in a crate runs about $12k. This is a relative bargain compared to the cost of building an air cooled equivalent.



If anyone is interested, please email me.

We think we can do the whole install for about $20k total with your old motor as trade-in.

Len@autosportengineering.com

[cgarr]

What Tranny?

[BoxsterGT]

The SC we are doing has a 915 5-spd trans.

Len@autosportengineering.com

[Zeke]

I guess he meant how do the older trannies and new motors marry up?

[JMatta]

I saw this photo in a different post and assumed it was a photoshop job. This will be quite an accomplishment, as running the radiator lines to the front (in a street car) isn't enough of a task.

Several years back, Sol at Perfect Power, installed a GT3R motor in Philip Colin's Fabcar...at least in a track car you have the ease to run the lines through the car, though it was still a monumental task locating radiators and such.

[Dan (almaden)]

have a friend who is putting a GT3 cup motor in a 912 chassis with 993 6 speed.
450HP in a light weight chassis. wooooohooo

CF roof, flares, etc....almost completed..IIRC he is using Ceramic brakes as well.
this car is going to be very trick...

[BoxsterGT]

I will post info & photos as we go along. The photo at the top is actually a 3.8 ltr 997 381hp X51 motor hanging in a 72 RS coupe we have here.

Len

[rouxroux]

Anxious to see how it does with an "artificial heart"...Hope it gets to retain it's "soul"

[ischmitz]

Originally Posted by Dan (almaden)

have a friend who is putting a GT3 cup motor in a 912 chassis with 993 6 speed.
450HP in a light weight chassis. wooooohooo

CF roof, flares, etc....almost completed..IIRC he is using Ceramic brakes as well.
this car is going to be very trick...

and he is from "down under"...... that crazy guy. I can't wait to see that beast come alive

[Jeff Alton]

I will certainly follow along!

Cheers

[petevb]

Mmm... Kelly Moss did a nice one- a "470 hp" GT3-R motor in a 993.
More images on their site.

I'm not sure water cooling is worth the hassle for 300 hp. The extra weight involved and cost of fitting seems to offset the cheaper motor cost. At 400+ hp, however, you're starting to run out of reliable air cooled n.a. options...

[sc_rufctr]

This is not new... How many early cars have later model engines in them?

But the idea of running a 400odd HP NA engine in a car weighing less than 1000kgs is exciting to say the least. As far as coolant lines and radiators... All of that stuff is available off the shelf and it's not heavy by any measure. (The coolant would weigh more then the pipes and radiators)

It would be relatively easy to build a car lighter than a late model 930 using water power. Now that's something to dream about.

"470 hp" GT3-R motor!!!! Yikes I'd burn my licence in about 30 seconds in a car like that.

[RWebb]

anyone happen to have the weight of the newer motors handy?

[onboost]

Not that it's really relevant at all in terms of hp/performance... but the water-cooled motors sure aren't sexy to look at.. Just a lump!

[petevb]

Originally Posted by RWebb

anyone happen to have the weight of the newer motors handy?

These weights not all from the same source, so are probably not apples to apples. These first three are published from Porsche, so should be comparable:
1997 Boxster M96/20 402 lbs "dressed"
2003 996 M96/05 449 lbs "dressed"
2005 997 M97/01 444 lbs "dressed"

The following was weighed on a corner weight scale, two different scales used were within ~2 lbs:
2003 GT3 Supercup dressed with stock flywheel, clutch and exhaust: 480 lbs
2003 GT3 Supercup no exhaust, no FW: 408 lbs
The above includes the engine mounted oil tank, which is mounted on the car for the air cooled motors and weighs 12 lbs for the GT3.

A 993 VRam motor w/o flywheel or exhaust weighs 351 lbs on the same scale, comparable to 396 lbs for the cup motor without the oil tank. Figure another 5 lbs for water in the motor itself gives you a 50 lb difference for a GT3 cup vs an air cooled car. You then need to add the difference between the water vs oil cooling stuff.

The M96/ M97 street motors look a little lighter than the cup motor.

-Pete

[JTO]

I can understand a GT3 motor that is based on the 964 case and its proven toughness. But why would someone want to put a 996 motor in their 911? The 996 motors are known to be inferior and suffer from a poorly supported crank (thus the RMS failures). Seems like a step backwards to me.
Troy

[vanwyk4257]

Any updates? I would be really interested in how you are mating this motor to the 915 gearbox?

[Kroggers]

This should be fun

[911st]

Wouldn't a V8 crate motor make more power and cost less?

[BoxsterGT]

Yes it would, but..........

Some old guys like me want to push their Porsche with a Porsche.

The new 4-valve motors are very powerful, emit "0" polution, and give better fuel mileage. I am looking forward to driving this myself.

Len