Engine Values. 3.5L motor & transmission sold on BAT

[CBA]

Not sure if this is the right forum.....how many of you follow Bring a Trailer? Curious on thoughts regarding the sale of this motor and transmission combo for $71k. This package seems to have all the right stuff and it's done so you save yourself a year of having to wait to get it done.

I'm guessing at $71k there is $15-$20k premium on it since its done, and no wait time but if you were to build something like this what would be a ballpark cost to do so? Just trying to gauge the market and costs as I'm ready to embark on another engine build.

https://bringatrailer.com/listing/porsche-911-3-5l-short-stroke-and-custom-915-trans/

[winders]

It seems a bit expensive for what it is…..I wouldn’t pay that!

[Neil Harvey]

Originally Posted by CBA

Not sure if this is the right forum.....how many of you follow Bring a Trailer? Curious on thoughts regarding the sale of this motor and transmission combo for $71k. This package seems to have all the right stuff and it's done so you save yourself a year of having to wait to get it done.

I'm guessing at $71k there is $15-$20k premium on it since its done, and no wait time but if you were to build something like this what would be a ballpark cost to do so? Just trying to gauge the market and costs as I'm ready to embark on another engine build.

https://bringatrailer.com/listing/porsche-911-3-5l-short-stroke-and-custom-915-trans/

That's good to know. I have a completely rebuild, fresh, 0 miles, 3.6L 911 Turbo hot rod engine ( 87 -88 MY ) for sale.

[Helix8]

Originally Posted by Neil Harvey

That's good to know. I have a completely rebuild, fresh, 0 miles, 3.6L 911 Turbo hot rod engine ( 87 -88 MY ) for sale.

is this "rebuilt by 3 ex (old) Andial race engine builders" ?

[Brad912]

Its what people are willing to pay. buying a complete engine ready to go I would think a premium would be paid. but i have no idea what it cost to build the motor.

[Neil Harvey]

Originally Posted by Helix8

is this "rebuilt by 3 ex (old) Andial race engine builders" ?

More 1 old ex Andial builder, me. But Steve and Rich did have their hands in this too.

[winders]

Originally Posted by Brad912

Its what people are willing to pay. buying a complete engine ready to go I would think a premium would be paid. but i have no idea what it cost to build the motor.

The transaxle is nothing special.....nor are the gear choices. The Quaife is a great if you are using the car on the street or for autocross. It's not a great choice for a track car.

The engine has some nice parts but could be a lot better. If I were building it with that budget, I'd use a GT3 crankshaft and a GT3 oil pump. I would also prefer different rods and pistons....and cams. I would also use Xtreme heads.

Note that the price did not include an engine management system.

[Brad912]

Winders why is a quaife not good on a race track?

Not to get off topic

[winders]

Originally Posted by Brad912

Winders why is a quaife not good on a race track?

The Quaife is a torque biasing differential and is not a true limited slip differential. Lift a wheel and the other wheel gets no torque. Not good!

[Brad912]

Ahhhh good to know

[Hi_Fi_Guy]

I noticed the auction and wondered if the engine fell into the, ‘you can’t build one for that price’ or not. Of course instant gratification is always a factor…. As long as it doesn’t need additional work.

[CBA]

Originally Posted by Hi_Fi_Guy

I noticed the auction and wondered if the engine fell into the, ‘you can’t build one for that price’ or not. Of course instant gratification is always a factor…. As long as it doesn’t need additional work.

Kind of what I was looking for too… from my last engine build 2 years ago a 3.2SS I’m assuming this build would have been in the $30k range back then… now I wouldn’t be surprised if it’s $35k or $40k to get one built if you had someone handle it from A to Z.

[Mahler9th]

The seller of that engine is an old friend.

Raced in IMSA a bit back in the day.

A Quaife is a TBD as Winders has said. I used a Guard TBD for many years on track and in racing. With proper car set up, TBDs can be just fine.

With my configuration and application, the difference was not even a second a lap.

I switched to a Guard LSD a few years back for a number of reasons-- lap time was not one of them.

[Matt Monson]

Fully 50% of the lap time improvement one gets with an LSD is on the lock up under braking aspect if it. One can brake later and carry 1-2 mph more through the corner because of it. It’s way more than what it does under throttle.

[JoeMag]

Yepper…. MUCH more stability (read keeping rear end from becoming front end) under braking by keeping rear wheels somewhat locked together and spinning at same speed with rear weight bias.

[Henry Schmidt]

It looks like a nice pile of parts. Value depends a lot about the buyers budget.
Could you replicate the engine and trans for $70K? probably but anyone building air-cooled 911 engines these days will tell you that supply chains a knackered and prices are up. Not to mention the plethora of sub-standard parts is frightening.
I'm thinking "a bird in the hand" might make the price reasonable.

[CBA]

Thanks Henry… good points.