Thanks for sharing your experience mr Carwin . i`ll guss well just have try , since the engine already is bulid . People have made this setup work really well before , so its possible , thats for shure .

So if anyone should have a more positive experience , cry out !

regards

Puma-Rotary .

 

Yes, that was me. I am hoping to do it again this year.

Thanx

Michael

 

Im thinking about a weber 48mm IDA, how good are these carbs? should i go with a 51 instead?

 

I gotta say I prefer the look of carb setup to any FI. Vven though it may not be as efficient it looks just mean.

 

here are some pics I found

 

1 more

 

40 years ago they were considered the best racing carb around. Theses days there performance leaves a lot to be desired, as most people expect more than they were designed to provide. The fact that they are racing cars seems to have completely slipped most people's minds.

The bigger the carb, the better its top-end performance will be be and the worse its bottom-end will be. Completely unnecessary unless you have a very serious motor, i.e. big bridge, J-port or PP.

 

I hate to hijack, but would it be possible to use the manifolds for a Weber sidedraft setup and instead use individual throttle bodies? Wouldn't you just simply have to plumb the manifold for fuel injection?

 

mmmm peripheral port

 

Much better idea.

 

So you just make an adapter plate to bolt the throttle bodies on and plumb in some injectors, right? Where could you find universal throttle bodies like that?

 

You don't use an adaptor plate, you use IDA-style TB's that bolt direct to a Weber manifold, like this one from Injection Perfection in Australia.




BTW, when I said "much better idea" above, I was referring to the EFI TB's, not the PP suggestion.

 

my bros fc

 

^WOW I'm completely speechless, I love seeing pictures of the rotary in its most simplest form and thats one of my favourite pics now, just stunning do you have more pictures?

 

who me?
yeah i got some

 

I love how much a carb frees up the engine bay!! It makes it look so simple yet very cool. If i get a weber im gonna keep the big stacks and just put some screening over them to help filter crap out.

 

running dcoe's on a fc3s like that with nothing along the lines of a ram air duct in the top of the hood bringing cold air to the filter right on to of the engine block is losing alot of power to hot engine bay air.

If you do something along these lines you need to put a plenum/air box on the trumpets and duct some cold air to it. I have the TWM dcoe throttles on my fc and ran with screens over the trumpets for a short period while I finished things up, the heat soak in the engine bay would bring intake air temps up to 175 F on a 60 degree day. This is horrible for performance, the stock intake does a better job of keeping the hot engine bay air out.

 

well do u know of any "cold air intakes" for the weber? didnt think so... so we have to deal with it

 

most people just make a little scoop in the hood right near the intake

 

a turbo hood would bring fresh air into the engine bay

 

Thats from www.xtremerotaries.com, an aussie based company that makes alot of goddies.

..not really....

 

Accepting that your setup is taking in hot engine air and leaving it that way is by no means dealing with it, it is ignoring it. You can make an air box for the DCOE carbs, or you can buy one from a company that sells em like someone else has already posted pictures of.

TWM also sells a air box for their throttles that can be used on their DCOE efi throttles, it's not that difficult to make one.

At the very least you could add a reflective heat shield between the engine block and the air filter to help keep the radiant heat from the block away from the air filter area, this combined with a scoop on the hood bringing fresh air to the top of the air filter would probably work well. One could make a simple partial box around the the filter that would seal up with the hood when closed with a scoop on the top, keeping engine bay air out of the inlet and getting nice fresh air directly to the filter.

 

im not trying to get flamed but i dont really understand where that intake tube runs at all

 

The air box allows you to place your filter outside of the engine compartment where you can duct cooler air to the intake instead of using the hot air under the hood. The intake tube can be run where ever is convenient for your application. On most RX-7's with a carb you would idealy want it infront of the radiator or where the headlight assembly is but thats not the only way.

 

sorry u misunderstood me, i clearly understand what it does and is used for but by the looks of that application i cant picture where it would run too. but thanks