What would you do with this Ebay engine?

[turbo6bar]

PORSCHE 911 ENGINE STREET OR RACE MOTOR

Is a 380HP 3.5L engine even streetable? Looks pretty cool.

[magilla]

Probably drive it sideways into a telephone pole 30 seconds from my house.....

[old_skul]

Looks like a racing-only engine. With that kind of compression, and with intake and exhaust ports opened up like that, and with such an agressive cam...it would likely only be happy with carbs (as he had it set up) and at 4000rpm or more.

[304065]

That's Chris Manfredi selling it. He's got an excellent reputation and races a GT1 turbo. I wouldn't hesitate to deal with him.

[Superman]

380 hp is quite a few for a NA 3.5L engine. It's possible, but an engine like this would have...ummmm.....attitude.

[cstreit]

380 HP with a 3.5L and only 10.5:1 compression?

They must rev the daylights out of that one.. Probably not that suitable for a street engine as I imagine the power band would have to be VERY peaky to hit those numbers.

With the same setup, this would mean you'd be getting about 320HP out of an SC, or 270 out of a 2.5L motor...

[JeremyD]

Jurgen - I think you answered your own question from the beginning.
Is a 380HP 3.5L engine even streetable? probably not very well...

[konish]

I wrote the seller and he seems to remember that all of the head studs were Dilivar...for race use where the engine would come apart after the season, it was probably a wise move. Street use though...I'd have to think that this would be a headache to deal with in the future.

R/
Dustin

[jluetjen]

At 3.5 Liters, I don't know what you could do with it excepting PCA GT? If it were 3.4 liters, it would be legal for SCCA GT2 at 2380 lbs. Anyhow, at 3.5 liters, I'm guessing that it's got a bore of ~102 mm and a stroke of 70.4 mm's. Given those dimensions and the port sizes, I'm guessing the peak HP is up around 7800 RPM. It might be a little lower, but the engine will need to be really good to be doing less the 7800 RPM AND turning out 380 HP. At that engine speed the ports are pulling about 103 meters per second which sounds reasonable, but fairly high so I would expect the HP to drop pretty fast after the peak. If you guess the peak torque of about 260 lb-feet 6000 RPM it would be consistant with the other numbers. At 7800 RPM the corrected piston speed would be about 4337 feet per minute which is a bit fast for a 911 on stock rods, but not completely outlandish considering that the '74 RSR had pistons speeds of about 4295 feet per minute.

The HP may actually be a little bit less then 380, but assuming that it is putting out what they claim, it would expect this motor to be VERY racy (as opposed to "streetable") with a fairly short life between rebuilds if you are using all of the rev's.

[konish]

Seller said 100mm bore (I didn't ask for the stoke info), with a 7300 rpm redline...actually here is his reply (seems like a super friendly guy):

"Not sure origin of case:I think its 930. Case casting #
930.101.103.4R, serial #6290282 also has 930/04 stamped on case. Pistons and cylinders are Mahle...yes to Nikasil which refers to the material..not manufacturer. Bore size is 100mm. Rod bolt diameter is actually 9.2mm, and crank is new Porsche factory part. I never use regrinds on Porsche as I had a bad experience many years ago, and I don't trust them. The rods were all resized and x-rayed before installing. Yes to Carerra tensioners, redline to 7300."

R/
Dustin

[Amac]

Putting this engin in a street car sounds like
something I would do.
The head work is somewhat agressive, the cams
or stepping out there a bit. 100mm p/c puts it at
the 3.5, 10.5:1 seems ok to me.
High rev'en, will sound great!
It's a solid setup, if your looking for a N/A powerplant
it's a not a bad choice.
Be a fun ride on the street or track!!

[jluetjen]

OK; Assuming that he is pulling peak HP at 7200 RPM and he's making 380 HP, he's generating BMEP's of about 198 psi which puts that engine in the same league as the Cosworth DFV late in it's development or the the 4.5 Liter 917 motor. Not impossible but...

On the plus side, I'd say that the port sizes are not grossly mis-sized and most likely aren't an issue if he hasn't messed up the shape. The 7300 RPM redline does not sound unreasonable in regards to piston speeds, even with a 74.4 mm stroke. It may still be a good motor, but I kind of doubt that it's a full 380 HP good motor. If the price is right and you're feeling lucky, why not?

[Shuie]

It hit the reserve at $5k, I thought it would be much higher

[Ho Hum 74]

Yeah, but it's missing a distributor and induction. That'll be another $4k

[techweenie]

This unit definitely calls for 46 IDAs -- a set is closing on eBay right about now. It's not necessary to run it twin-plug, so you could get away with a conventional distributor.

Interesting alternative to the relatively trouble-free 3.6: easier to plug in; potentially more power (I don't buy the 380 number). I suppose you'd want to hook it up to a G50...

Glad I have a few days to think about how this would work in my '72 coupe...

[cstreit]

10.5:1... I'd either run twin plug with 94-95 octane or a good race gas... 103 or so to be safe on the hot days...

[limble]

Originally posted by john_cramer
That's Chris Manfredi selling it. He's got an excellent reputation and races a GT1 turbo. I wouldn't hesitate to deal with him.

I'll try to use that argument to convince my wife that a really,really need it.
I think I'm beginning to drool again.

[BGCarrera32]

Screw the motor, gimme what's behind it in the picture...!

The name in the window says "Stippler"

[Por_sha911]

What would I do? Wet my jeans with joy the first time I stomped on the accelerator.

[Joeaksa]

Guys,

The compression is not that big of a deal! The stock 4 litre V-8 motor in my 2000 Jaguar is 11:1 compression and its not a race motor! I do have to run premium fuel but its not peaky and while its very powerful its very smooth and easy to work with.

A lot more concern for the street is what profile cams are installed in it. A motor that is lumpy and will not idle below 2000 rpms is not going to be one that a wife or G/F will put up with for long. Might be fun for us though!

JoeA