Engine and Transmission Tech

Somewhat rare.. Want Hilborn or DCOE's ? Fits big port heads, only. I have sand cast pattern. Want any ?
Onward, Art.

By big port, what do you mean? Buick 300 or maybe TA Performance or? Mickey's Buick powered Indy Car used a downdraft manifold but Lance Reventlow's Scarab used the sidedraft manifold with DCOE Webers. According to the "Souping the Special" article, the Scarab engine (239 cubic inches) 58mm DCOE carburetors with 1.85 inch venturis made "considerably more horsepower than the 45 DCOEs with 1.57 inch venturis tried earlier." So how did you come up with the patterns to the Mickey Thompson sidedraft intake?

[www.teambuick.com]

I recently came up with the DCOE sidedraft in the attached pictures. The carburetors are genuine Webers and I got it relatively inexpensively since the Buick/Rover manifold has taller ports that don't match Rover or Buick 215/300 ports.
I plan to have them welded to size. I do need to find a thermostat housing as the manifold takes a smaller diameter one than the Buick/Rover. I'd appreciate any leads on the thermostat housing. I expect it's from a British or European engine of some sort.

Dan,
indeed side draft is my manifold.! Bought pattern and manifold decades ago, Beal's Cstings ? For tiny thermostat housing,
I intend custom billet, attached with horizontal Bajo clamp, with sized restricting washers for temp control. I talked to a very clever
"tech" at Redline/ Webber.. When you compare cfm ratings, 48mm DCOE is adequate for any possible RV8.
Cheers, Art.

Corrections/etc a, Could 58mm DCOE;s be a typo ? . b., Banjo clamp. :More likey 239" motor used 48mm DCOE's.
FWIW, a 48DCOE with a 38mm choke is rated at 296 cfm./ per barrel ? Potential power # 's from these theoretical flows,
will destroy a standard, cast RV8 crank in short order. Plan B ?
Onward, Art.

> indeed side draft is my manifold!

Small world. Any idea what that port was sized to? It doesn't match a Rover or Buick 215/300.

> For tiny thermostat housing, I intend custom billet

I saw a similar intake set up for sale in England that had the linkage and thermostat housing. I need to contact them to see if it is custom or sourced from another vehicle.

> Could 58mm DCOEs be a typo ?

Very possibly. I think the common DCOE sizes are 40, 45, 50 and 55mm. Shelby ran 48mm IDA Webers on his 289 Cobras. Ford had special 58mm Webers made for the 427s.

> Potential power #'s from these theoretical flows

I'm hoping the 45 DCOEs will be sufficient for my purposes. When I get the chance, I'll run them through Dynomation and see what the simulation thinks.

> FWIW, a 48DCOE with a 38mm choke is rated at 296 cfm./ per barrel?

Independent runner CFM doesn't translate to 2 or 4 barrel common plenum CFM ratings. I've got actual dyno for a set of 48mm IDAs on Hall Pantera intake (Ford 351C) versus a Holley Strip Dominator single plane intake manifold and a Holley 4 barrel. Compared to 48mm IDAs, the single plane started making more power above approximately 480 HP but had a much broader power curve below. That agrees with what David Vizard said about his 48mm IDA testing (they become restrictive above 500 HP compared to a good single plane and 4 barrel combo).

I suspect the 8" runner length on Reventlow, will have advantages over downdraft manifolds. Making 500+ hp. on a NA , RV8
will quite a chore, even with TA heads.
Onward, Art.

Hi Dan,
If you can find a small enough thermostat, I will do the rest. I think I can put a welded sbf crank in the RV8/ Buick.
Cheers, Art,

Thanks Art. I'll start looking for a small diameter thermostat.