Devin D Porsche Race Car Project

[C J Murray]

The Devin gets put into the trailer tomorrow. We head to FL Friday with Sebring at the end of the month.

[Vic Skirmants]

Sure hope you have the rear engine sealing tin.

[Neil Bardsley]

What type of distributor is that?

[C J Murray]

Sure hope you have the rear engine sealing tin.

Useless weight on the track.

[C J Murray]

What type of distributor is that?

MSD, I used the same on the previous racer. For the street the 123 is better but when using the MSD box and running at full advance most of the time the MSD distributor is better.

[Vic Skirmants]

Sure hope you have the rear engine sealing tin.

Useless weight on the track.

Yes; hot air off the track is certainly lighter than cold air.

[Charles H Jacobus]

Wouldn't that add to drag? Seems there would be a lot of burbling going on.

Chuck

[C J Murray]

Sure hope you have the rear engine sealing tin.

Useless weight on the track.

Yes; hot air off the track is certainly lighter than cold air.

At 100+mph I expect some fresh air to find its way to where it is needed.

[Erik Thomas]

CJ I am looking forward to the race report. Devin looks great. Always had a sneaker for those cars.

Regarding the hot air in the engine compartment: On the Formcar-Porsche, I ducted the air intakes to the carbs to a separate intake, and the fan intake also to a separate intake ( the normal Porsche grille ) These are sealed with aircraft diaphram seals. Recently, I have been working on a belly pan that seals off the underside. The sump and transmission drain poke out the bottom. The goals of all of this are to keep cold air on the intake sides, and warm air only out the designated exit.

[C J Murray]

CJ I am looking forward to the race report. Devin looks great. Always had a sneaker for those cars.

Regarding the hot air in the engine compartment: On the Formcar-Porsche, I ducted the air intakes to the carbs to a separate intake, and the fan intake also to a separate intake ( the normal Porsche grille ) These are sealed with aircraft diaphram seals. Recently, I have been working on a belly pan that seals off the underside. The sump and transmission drain poke out the bottom. The goals of all of this are to keep cold air on the intake sides, and warm air only out the designated exit.

Hi Erik, I can't argue with the heat concerns. When I was considering what to do about it and looking at what Devin did I decided to do nothing(easy) and see what happened. I looked at the old Porsche Spyders and they didn't do much in that regard. It seems to me that you either have to control the air very effectively or you would be better off with no control at all where lots of fresh air is rushing all over. Chances are that there will be many teething problems with the Devin and this may be one. Thanks

[C J Murray]

Snow racing?

[Wes Bender]

You could put provisions on the front for a snow plow, but then again there's that weight issue.....

Beautiful car, Cliff.

[Alan Hall]

CJ I am looking forward to the race report. Devin looks great. Always had a sneaker for those cars.

Regarding the hot air in the engine compartment: On the Formcar-Porsche, I ducted the air intakes to the carbs to a separate intake, and the fan intake also to a separate intake ( the normal Porsche grille ) These are sealed with aircraft diaphram seals. Recently, I have been working on a belly pan that seals off the underside. The sump and transmission drain poke out the bottom. The goals of all of this are to keep cold air on the intake sides, and warm air only out the designated exit.

Hi Erik, I can't argue with the heat concerns. When I was considering what to do about it and looking at what Devin did I decided to do nothing(easy) and see what happened. I looked at the old Porsche Spyders and they didn't do much in that regard. It seems to me that you either have to control the air very effectively or you would be better off with no control at all where lots of fresh air is rushing all over. Chances are that there will be many teething problems with the Devin and this may be one. Thanks

Cliff,
I don't know about 550's but pretty sure RSK and RS60/61 had full bellypans that seperated exhaust area and cooling exit air from fan inlet and carb inlet air.

[Jack Walter]

That's a gorgeous car Cliff - good luck at Sebring. 550's didn't have much air management under the rear deck either.

Ernie_wSpyder-X4.jpg (657.83 KiB) Viewed 2245 times

[Erik Thomas]

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Here is a picture of the Formcar-Porsche air box that directs air into the cooling fan. The flat pans part way up the velocity stacks fit tightly in to the carb air intake bumps. Once I get the belly pan installed, air from the cooling fan exits though the wheel arches and two vents at the rear. The reason I have gone to all this trouble, is that dirty air covered with tire dust and other crap was circulating in the engine compartment. I also think that was causing a lot of drag. Now the car has a smooth profile underneath from nose to tail.