Technical > Spud Miller's Cave

Spool size on a Crower IR injection.

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Sidewinder:
Hi :) As vintage  dragracing is growing here in Norway, new Engines are built.
We are currently working with a Crower IR set-up for a BBC, 580 cid.on Alky.
Does anybody know the width / Sizes on the spool in the Crower Barrel valve?

Best regards
Kjell

denverflatheader:
Kjell - vintage racing popular there, means you have good shows.  See picture of a friend’s “vintage” Crower 8H.  Was on top a 6-71 early hemi and has original Crower barrel valve.  The Crower stack injection BV setup differs.  Are you seeking dimensions to machine your own BV and spool?  Alan

dreracecar:
For the type of racing we do on this site, the spool or barrel valve are basicly the same size and diameter with the only difference between gas-alc-nitro is the idle slot/ramp

Sidewinder:
Hi Alan, yes new cars popping up, and some cars gets some upgrades.  Yes the shows are really good, actually we are invited to one of the best tracks. Hope to make it there with the Flathead dragster, waiting to get it machined. ;/ After last year, read record short, the block cracked in nine places :o I don't know if the spool is the same for the stack and blower injector.

Bruce.
The Crower spool has a larger diameter and a narrower slot then Hilborn with a .400" slot. But according to my calculations, they should have approx the same arial. The problem is that the engine don't get enough fuel, even opening the BV for more leakdown will not help. A .50 pill@4psi on the main byfass help some, but still to lean. The 580 cid has eight X36 Enderle nozzles and we use a Enderle 81A-1 fuel pump cam mounted. The system pressure at idle is approx. 20 psi witch i think is way to much, and thinking that the spool is the restrictor. As a note, we don't have an Idle bypass.

The owner has made some spool blanks this week, so we will try to make a new spool with a little wider slot and maybe a little more aggressiv ramp. The butterflies are 2.9 " in diameter, so we need a lot of fuel when they open up.

If we knew the excact spool data, it would have been a little easier to tune it, but I do belive we will get it running. Hope :)

Kjell

denverflatheader:
Flathead block “cracked in nine places” that’s record in my book : )  That many cracks might not be fixable.  Nice to receive invitation to run at best track, rarely happens here for a “Supercharged Ford Flathead V8.” 

Was guessing you were making your own parts.  Spool doesn’t look complicated to replicate, make it work flawless requires more determination.  Crower made a individual runners (IR) unit for the 396-427-454ci Chevy with butterflies close to 2.9”.  Your friend’s 580ci engine little larger…

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