Crawford Billet Power Blocks

[Sleepless]

Some info on supercharger and longer intake runners: http://www.ft86club.com/forums/showthread.php?t=85168

Also, since these raise the manifold, you'll need make some adjustments for most SC kits.

30 seconds of SEARCH... Just sayin'

[Deepseadiver]

Thanks for the link, however not a lot of information there. I think only two people have tested with them Shiv and Delicious. No word from Crawford.

[Sleepless]

Mine are being installed Aug 12 @Drift-Office. There is a very good chance that this winter I'll be having them install the JRSC so we can experiment

[Sammakko]

i heard in another thread that these are not recommended with e85. is that really the case?

n/a car, e85 tune from OFT

[Jmonty]

Originally Posted by Sleepless

Mine are being installed Aug 12 @Drift-Office. There is a very good chance that this winter I'll be having them install the JRSC so we can experiment

I was running with for a couple of weeks with the JRSC but have now removed them.

[Sleepless]

Originally Posted by Jmonty

I was running with for a couple of weeks with the JRSC but have now removed them.

Did it make a difference? Any before/after dyno?

[Jmonty]

Originally Posted by Sleepless

Did it make a difference? Any before/after dyno?

They seemed to heat soak, different days butIi made more power without. I don't have before and after dyno to compare side by side, when I pulled them off I also added the oil cooler

[FTemplar]

Originally Posted by Matey

Can someone explain to me why it doesn't benefit FI? it'd be doing the same thing it is right now, would it not? don't troll me. this is a 100% serious question. thanks.

If i'm not wrong, I read somewhere that it doesnt fit physically after you go FI.

[sidesleeper]

Originally Posted by Jmonty

They seemed to heat soak, different days butIi made more power without. I don't have before and after dyno to compare side by side, when I pulled them off I also added the oil cooler

I also had the same results.

They heat soak. Power drops off up top with them installed hot or cold.

I took them off and sold them to the next sucker.

[celek]

Originally Posted by sidesleeper

I also had the same results.

They heat soak. Power drops off up top with them installed hot or cold.

I took them off and sold them to the next sucker.

Originally Posted by FTemplar

If i'm not wrong, I read somewhere that it doesnt fit physically after you go FI.

Originally Posted by Jmonty

They seemed to heat soak, different days butIi made more power without. I don't have before and after dyno to compare side by side, when I pulled them off I also added the oil cooler

You guys do not understand the point behind the product.
This product is basically changing the intake runner length.

Result is more TQ and shifted power band. If you are worried about PEAK power and hovering your engine at 7000RPM all day the product is not for you.

The faster you can make peak power the faster the car goes.
Same in Forced induction world. If you make 800 HP but don't hit full boost until 6000RPM the guy with full boost @3000RPM making 400 HP will beat you because his power band is reached faster.

The fact the TQ band and power band is shifted makes for faster acceleration. If you are worried about that last 300RPM go ahead and hover as it flattens out on the track for a good second while the other guy has already shifted into his power band pulling on you.

This scenario is the same for any engine as well. Longer runner = more TQ less top end. If you want extreme top end go with Individual throttle bodies but you will lose the Torque down low. Trick is finding the happy medium.

[sidesleeper]

Originally Posted by celek

You guys do not understand the point behind the product.
This product is basically changing the intake runner length.

Result is more TQ and shifted power band. If you are worried about PEAK power and hovering your engine at 7000RPM all day the product is not for you.

The faster you can make peak power the faster the car goes.
Same in Forced induction world. If you make 800 HP but don't hit full boost until 6000RPM the guy with full boost @3000RPM making 400 HP will beat you because his power band is reached faster.

The fact the TQ band and power band is shifted makes for faster acceleration. If you are worried about that last 300RPM go ahead and hover as it flattens out on the track for a good second while the other guy has already shifted into his power band pulling on you.

This scenario is the same for any engine as well. Longer runner = more TQ less top end. If you want extreme top end go with Individual throttle bodies but you will lose the Torque down low. Trick is finding the happy medium.

Your perception is your reality, not mine.

[stugray]

Originally Posted by Matey

Can someone explain to me why it doesn't benefit FI? it'd be doing the same thing it is right now, would it not? don't troll me. this is a 100% serious question. thanks.

Here is another way to think about it:

With NA, the engine is a vacuum pump and it is pulling air through the intake manifold.
So in this "regime" the smoothness of the intake path is the primary contributing factor to how much air charge you get into each cylinder during the intake stroke.

With FI, the engine is no longer pulling a vaccum at the intake valve, the FI is pressurizing the intake manifold side.
So that air charge is just sitting on the other side of the door (valve) to get in.
In this regime, the smoothness of the intake manifold is NOT the primary contributing factor to ho much air charge you get.

Another factor is the momentum of the air charge rushing towards the intake valve when it closes causes a "standing wave" of pressure in the intake that changes frequency (and therefore wavelength) with RPM.
Under FI, the standing wave is completely different so may/may-not benefit from the change in intake runner length that the BPBs provide.

[celek]

Originally Posted by sidesleeper

Your perception is your reality, not mine.

not my reality, it is simple physics and velocity. You see the same thing in the Honda world with the Acura GSR that has 2 different length runners and a butterfly valve to divert air flow to a shorter runner at a specified RPM for high horsepower.

The longer runners provide more TQ while the shorter runners provide less TQ at higher RPM resulting in more top end.

This is why the Type R has a really short straight runner for more top end but not as much TQ because its designed for road racing and staying in a Power band when it was a Spec car in the late 1990s.

Same can be achieved on the exhaust manifold.
https://www.physicsforums.com/thread...eaders.208674/

Same can be seen here in Lemans cars ITBs.
https://grassrootsmotorsports.com/fo...s/58727/page1/

The Crawford BPB have been proven by numerous 3rd party reputable sources who originally doubted the claims. If you had a different experience you may want to find a different tuner for the VVC maps and Injector timing since they have been moved up slightly.

[stugray]

Originally Posted by sidesleeper

Your perception is your reality, not mine.

His "perception" IS REALITY, therefore it is your reality too.
(unless you live in an alternate universe).

Perhaps what you meant to say was "My observations do not match your explanation"