Crawford Billet Power Blocks

[nelsmar]

Originally Posted by Luis_GT

Awesome! Can't wait to see third party results!

Now if only some intake manufactures would do this!!! I want to some some intakes that ACTUALLY make power post tuning but it costs me a lot of money to do the testing!

[VroomVroom86]

Originally Posted by nelsmar

Now if only some intake manufactures would do this!!! I want to some some intakes that ACTUALLY make power post tuning but it costs me a lot of money to do the testing!

Grimmspeed?

[wparsons]

Originally Posted by nelsmar

Let me put it this way... Crawford offered for me to drive down and use their dyno just for R&D testing. If they want to back their product up that bad I am extremely interested.

Ill be doing these dynos:
Stock vs Tuned
Stock + Blocks vs Stock
Stock + Blocks vs Tuned + Blocks

That's a really awesome offer on their part!

[Captain Snooze]

Ummmmmm.....
*raises hand*
I am looking forward to seeing the results of nelsmar's testing but I can't but help being a little skeptical. The saying "if it appears too good to be true then it probably is" comes to mind. From reading this thread I can't seem to find any disadvantage which flys in the face of "everything's a compromise". Is there a trade off?

[Dimman]

Originally Posted by sw20kosh

The vol. efficiency is increasing in the 5000-6400 zone which causes more torque there but the vol. efficiency drops off sooner than stock. Luckily the boost in vol. efficiency is so good that it prevents the torque from ever going below the stock curve.

Look at where the torque starts dropping off for both runner lengths. Crawford's may make more peak torque but it starts to drop off sooner than a stock torque curve.

As for low end power, it is indeed a little odd that there is no change there.

Can't wait to see nelsmar's tests!

The no low end loss can be attributed to the runners still being outside of the negative acoustics zone.

How long do these things look? 1 1/4"?

If it's a genuine acoustic-driven VE change, and possibly slightly better flow by entering straighter. These results should be easily verified with longer manifold runners, withe the same straighter curve leading to the head.

This stuff is old, and related to stuff like changing trumpet lengths on ITBs. The science is real, but I would wait to see if Crawford's application is real.

And whoever is testing them, shouldn't you need a built block to handle the massive power gains?

Heh...

[FrsDuke]

Originally Posted by Captain Snooze

Ummmmmm.....
*raises hand*
I am looking forward to seeing the results of nelsmar's testing but I can't but help being a little skeptical. The saying "if it appears too good to be true then it probably is" comes to mind. From reading this thread I can't seem to find any disadvantage which flys in the face of "everything's a compromise". Is there a trade off?

Well the trade off of longer runners is high rpm power loss. It shows this on the dyno plot, but the gains more than offset the loss in this case. With cams and a valve train targeting peak power above 7k this could be an issue but with the stock cams and rev limit it appears to be a win win. It's a well established phenomenon. Think about the old b18 in the grs, the tundra acoustic induction manifold etc. Not a new idea, just surprisingly effective for this car. The question is how does it hold up to tuning, and when will someone tackle a variable system.

[Captain Snooze]

Originally Posted by Dimman

And whoever is testing them, shouldn't you need a built block to handle the massive power gains?

That's funny in a Crawford thread.

[RacerX]

Crawford is 5 minutes from my house. Maybe I can stop by and ask a few questions myself.
Isn't it odd that these would be made from aluminum? That would raise the intake temps.

[SkAsphalt]

Sooo will this boost us FI guys?

[Captain Snooze]

Approximately 40mm -> 19hp gain
so 12 meters equals approximately............ 5,700 hp @ 4 rpm!!!!!

[P@ul]

Originally Posted by Superhatch

From their website:



If this is stackable with other bolt ons and a tune this would be awesome news for the NA community. Also, expect this same product on Ebay for $100 by the end of next week.

This is the whole paragraph from Crawford's page: http://www.crawfordperformance.com/p...er-blocks-bpb/

Crawford Performance is proud to announce our latest product, the Billet Power Block (BPB).
CNC machined from Billet 6061 aluminum, our BPB sandwich between the cylinder heads and the intake manifold to create longer intake runners. The lengthened intake runners enhance the volumetric efficiency of the engine which translated into an increase of 19 Horse Power, 15 Pound Feet of Torque and narrowed up the torque dip by 300RPM on a totally stock BRZ. Our BPB also works with any aftermarket tune, exhaust and intake components. Our original road testing was done in conjunction with our stage 1 reflash followed by extensive dyno testing with and without a tune.

Sounds like creative interpretation. *shrugs* I can wait for a 3rd party dyno on a completely "stock" car.

[migueralliart]

I just dumped another 400$ to my turbo savings account.

[MAPerformance]

Originally Posted by RacerX

Crawford is 5 minutes from my house. Maybe I can stop by and ask a few questions myself.
Isn't it odd that these would be made from aluminum? That would raise the intake temps.

It wouldn't be any different than stock. The OEM block the manifold is bolted on is aluminum. The intake manifold itself is plastic, so it is already less prone to heat soak.

[nelsmar]

Originally Posted by Dimman

And whoever is testing them, shouldn't you need a built block to handle the massive power gains?

Heh...

I know you were just making a joke... But I do have a built block