Tech Question...nozzle location on alky injection

[jrvanosten]

I am switching over from an old Hilborn 396-C BBC stack injection to a BDS standard deck blower manifold, with a custom built aluminum plenum box and bird catcher system for injected alky on a 505 CID engine. We have the pump and major plumbing squared away, but we have issues with clearance of the nozzles going to the runners of the manifold. The standard straight nozzle with the SS hard lines make it nearly impossible to remove /attach our sheetmetal valve covers. We have 4 sets of different style valve covers, all with pretty much the same issues. With this being said, we have heard numberous suggestions on where we should plumb the nozzles on a alky set up. Our simple fix to this clearance issue, would to be to nozzle right into the bottom of the hat. We have been told that this type of configuration on alky needs to nozzle near the intake ports, but for nitro you'd go to the hat and visa-versa. These opinions have varied and come from people I consider very knowledgable to this stuff.

So, I was hoping to get a few more opinions before we make a major change (IE Going to a tunnel ram, buying a different blower manifold, etc)



Thank you in advance.

JR

[dmoseley]

JR.. I was told by the guy at Enderle that the nozzels should be 1" up from the base of the manifold. So thats where I put mine.. Also, Is it really necessary to have hard lines.??Use the hoses, You can move them around much easier... just my .02 cents worth...

[glofria]

Mr. Mosley has it right. Make sure the nozzles are perpendicular to the intake surface and reaches to the middle of the port runner. Use rubber flex hoses as they are easier to work with and you can now make changes to (tune) individual cylinders to even out tempetures. Nozzles in the hat will not allow you to do that. W/O a blower, no need to cool the rotors either.

[jrvanosten]

I really want to use my set up, but with hard lines or rubber hoses, I still have clearance issues between the nozzle "nut" and the valve covers and/or valve cover stud. Looks like I need a taller manifold or a tunnel ram.

[Ole Sparky]

JR,
How about a Holley tunnel ram with hard lines and distribution block in the center of the manifold. You will have to use a 3" spacer so your Bug catcher linkage bracket will clear your sheet metal valve covers.
You should start with #36 nozzles.
If you have any questions call me.

Ole Sparky