The Mallory's are definitely more expensive..

Mallory 12lb. pump averages $250ish but comes with a regulator (oh boy, heh) $195 without reg.
Mallory 7lb pump averages $130ish.

these are of course brand new prices, but dang that hurts. A holley blue is only $107 and red $95 @ Summit.

Thanks for the info guys.

Mike

 

I've got a RB prepared holley on a '78 4 port 13b with a street port. It hauls *** and is still pretty good one fuel when I'm puttin' around. I'd like a Webber IDA but with it running this nice... it's hard to justify the $800 + manifold. Doughnuts?? Big radius 2nd gear fatties without any cut-out. Maybe I got lucky with that float bowl problem.

I still vote Webber... but I'm happy with my Holley.

 

I had a RX3 set up with 13b bridgeport ran a 48IDA, Holley Blue and it was fast. Real fast, never had starvation problems as the Weber bowl is much bigger than the Holley, it is a race carb built for race cars, if you want speed, sound and fun, definately go Weber. If you use the Holley Blue it must have airflow to cool it as it does not use the fuel to cool it. I ran a flexible hose into the trunk and directed the air onto the pump. You will want a return line so that you can keep enough flow to the carb. Remember that you will need a fuel pressure regulator to dial in and maintain your pressure. Run a larger fuel line now so that you dont have to redo it later and use the existing line as your return line.

I raced this set up 9 months a year for 6 years without a single fuel problem.

 

Why a return line? Just wondering, as some people say you don't need one and some say you do.

Mike

 

I'M thinkg of doing a fuel injection to carborator switch, I understand most to the setup but still a little confused with the fuel pump that needs to be used and the fuel pressure that should be ran.

 

You can run a Malpassi or equivilent regulator that can be tuned down to carb level (4.5-7 psi). This is usually used on carb turbo set-ups for max volume needed under boost. Otherwise, change original EFI push w/ return pump for a pull style carb pump (Holley, Mallory, Carter)

Smeagol..the return line reduces the chance of vapor lock on hot days. Not really necessary unless you're in really hot conditions for long periods of time (i.e. drag racing or road racing on hot days with scorching track temps, highway driving on the 5 in the summer in peak heat!)

 

I recently converted my fuel injected S5 Motor in my S4 1988 RX7 Convertible to a 600 CFM Street/Strip Holley Carb.

I wanted to go with a Weber 44 or 48 IDA Sidedraft setup since there is more power to be gained above Stock Fuel Injection. This was a suggestion by Carlos Lopez of CLR Motorsports Miami.. I was desperate to get my ride back on the road so i opted for a transitory option in the meantime. Charlie of Turbo Clinic suggested a Holley Carb and I wish I would have waited for the Weber.

My girlfriend hates the fumes and odor that the Holley puts out.. also I have noticed that the Holley is a good carb for straight aways but not for cornering or curves. The odor with the Holley is quite pungent.

The Weber setup eliminates any bogging on turns, slopes, hard cornering and curves.. it's actually an all around better option for the FC. Back in the early 80's I used to race a 1969 VW Beetle in NY that had 48 IDA webers, a Hot camshaft, and other goodies and was doing 10.69 in the quarter.

When it came to the fuel pump and fuel pressure regulator argument. Here are the pros and cons..

Normally one would think that going with a Holley Carb setup would require that you replace the stock fuel injected fuel pump that creates more pressure close to 40 psi because at that rate it will blow out the gasket in the float bowl. It happened to me and Charlie's mechanics came out to rescue me and Jonathan along with Steve did a great job of getting me back on the road. Charlie had the Holley fuel pressure regulator P/N 12-803 which i paid $33.00 separately for out to its maximum adjusting position. Keep in mind that i am using the stock fuel injected fuel pump that came with my vert. His suggestion was to purchase the Holley "Blue" fuel pump P/N 12-812-1 for the low price of $120.00 and another $80.00 in labor to hook it up. I also had a liquid filler Russell Fuel Pressure gauge $24.00 installed with my Holley setup that unfortunately is on there for looks because it doesnt register anything at all as you will soon find out as you read on.

Carlos Lopez had a solution for me that would eliminate the problem without having to replace the fuel pump which would be expensive at this point in the game. I gotta tell you that this man knows his **** really well dealing with RX7's and Rotary Technology. He suggested replacing the Russell fuel pressure gauge since it was not registering or reading. One way he came to that conclusion is to attach a tool that he has to correctly adjust fuel pressure that is made of an older version VDO gauge and fuel lines attached to it. Then what he did next was to remove the Holley Fuel Pressure regulator and its place install a Malpassi (Made in Italy) Fuel Pressure Regulator that is shaped like a flying saucer and with his gauge he was able to set the pressure at 6psi. I was able to keep the same stock fuel injected pump that came with my vert. Another person that was in agreement with this setup is Dennis DeSilva "RPM Doctor" forum name of High Tech Auto. Carlos got my new reborn FC Convertible "Jezebel" running right... all we had to do is just use the Malpassi fuel pressure regulator that retails for about $85.00 or so.

All in all I made out pretty well and it goes to prove to the old saying: "You get what you pay for "

Carlos Lopez is a genius at what he does best and this man has a world of knowledge and in the next couple of weeks I will be getting the Weber 48 IDA Carburetor and Manifold from Racing Beat. The Holley carb is a good setup and its simple to actually do the conversion so I will have the Holley Carb up for sale within the next couple of weeks as I will be going with the Weber setup that Carlos Lopez suggested to begin with. I will also be going with a single turbo setup and he will be the person to build this motor together.


Malpassi Vs. Holley

I recommend using the Malpassi Fuel Pressure Regulator instead of the Holley. This is an older pic before I had the Malpassi Installed .. I will update this pic that will show the stainless steel braided lines and of course the Malpassi fuel pressure regulator. This is pic is just to give you an idea as to what the conversion looks like.. this Holley Carb and manifold set up will be up for sale soon. I expect to get what i paid for .. this system was installed just last week so it is still relatively new.

 

Here is the pic of the Holley carb with a Malpassi Fuel Pressure regulator
Quite simply the best fuel pressure regulator to use.

 

 

you can easily make a holley love turns and high speed cornering. and what's even better is you can grab a holley off ebay for say... 40 bucks, rebuild it (which is as easy as a weber and half as hard as a nikki), use jet extensions and center hung floats, and bam you have a beast for under a hundred bucks eaaaasy. now where alot of people make their mistakes going holley is they get that junky 4160 model. get a 4150 double pumper. you can even use a 600cfm on a stockport 12a. no "special adjustments" have to be made as racing beat will tell you. just what i said about the floats and jet extensions which is good to do anyways. and if you want better gas mileage you can run a lower hg powervalve and/ or drill out the pvcr's. any carb can be great, but you gotta know what the **** you're doing. unfortunately alot of people get holleys and slap them on there expecting them to work out of the box. not gonna happen. same with webers, mikuni's, etc... altho with the others they may be a little closer in tune. hell, even boost prepping a holley is quite simple. i guess i'm a 4 barrel junky.

 

whats with the text ad hyperlinks??

really making this site look lame

 

What Hyperlinks ? I dont see any ....

All I see is bolding words in Red

 

nah i was refering to the intellitxt

 

I have a question... one of my tuners installed a 600 CFM single pump 4 Barrel Holley.. he didnt connect the secondaries because he felt that it would blow up my motor. He felt this way because I didnt change out my stock rx7 fuel pump.

Carlos Lopez on the other hand who is pretty much a genius suggested i use the Malpassi fue pressure regulator because he swears by them.. He said that I could leave the stock fuel pump. The Malpassi is set for 6 psi. So now i have an Holley regulator that is selling on ebay for $15.00

This was my question... Charlie connected the secondary by just crimping it together with the primary lever. Another Jamaica RX7 Tuner Dennis DeSilva said that the secondary should be set to go on by vacuum and not mechanically or else i will be wasting gas like crazy. Yesterday I was at a full tank and today i am down to less than half of a tank of gas.

Do you believe that the secondary barrels should come on by vacuum or mechanically ?

 

If you want reliability (for secondaries opening) and know that when you put your foot down it's gonna go, then mech secondaries are the way. If you are worried about economy then maybe go with the vacuum, or make it mechanical in such away that you can disengage secondaries (manually) when you want to save some $$$$.

 

sounds good thanks.. i believe that i will go vacuum.. as not to lose power but help in spending less gas...
Thanks again

 

yea...

power = mechanical secondaries (which if you can keep your foot out of it, you will be fine for mpg)

no power = vaccum secondaries (won't be useless, but not as fun or fast)

 

Use Carlos Lopez of CLR Motorsports uses them and he has used it on mine with the stock fuel inj pump. It is set for 6psi and it is a great option than having to replace the fuel pump and regulator.

Here is a pic of the Malpassi & part number: CHM FPR0106
I purchased it at Murrays Speed & Custom

 

Unfortunately my mechanic Charlie of Turbo Clinic used a 4160 on my RX7 because he felt it would go with my personality as he put it. I dont race and my vert is just a three day weekend car due to the current gas prices.

He hooked up the secondaries manually by crimping the lever to the front primary lever. So my secondaries come on at the same time practically as soon as i press the gas pedal. I noticed the power but also see how I run out of a full tank of gas by the second day.

The 4160 that I have has a vacuum but i was told by pro that rotaries dont normally produce sufficient vacuum in order to open the secondaries so that is why they are connected manually.

Each time i go to Charlie I am in fear that I will get charged again for him tinkering with it ... I checked with Murrays and the Holley dont carry a real warranty once the mechanic touches it the warranty is gone. That sucks !

I was told for the driving that i do the 600 CFM p/n 0-1850 is a good carb.. it doesnt have adjustabe floats so in another aspect I am limited as per Dennis DeSilva of High Tech Auto. He prefers to run a 650CFM model 4150 since it does allow for adjustments.

I tell you... yesterday I drove my vert for about an hour and when i got off the expressway and got to the light the car was idling rough about 400 rpm and then it shut down... I got it running and kept my foot on both the brake & gas pedal to prevent it from shutting off. I got home and checke the car on idle the next morning and found that the secondaries was dropping globs of fuel and that it was flooding out. I cleaned the float bowl and found some dirt in it perhaps from the rubber fuel lines.. even though i have the worst chrome glass fuel filter from Mr Gasket that leaks by the way. Today it is bogging and again it is flooding...

At this point i really dont know what to do ... i really need to do something because i am getting frustrated with this.. i cant even drive my car on a date without having to worry that i might have to call another tow truck.. in fact i think that State Farm is going to cancel my policy for as many times that i have had to call a tow truck.

I bought this carb less than 3 weeks ago... I think that i should have been alittle more patient and waited for Carlos Lopez to return so i could get the Weber setup he had talked about.

Charlie seems to think that the Malpassi is designed for a turbo and that if I use a Holley Carb then i should also use a Holley Fuel Pump and Holley fuel pressure regulator.

If you know of any way for me to connect the vacuum portion of it then please let me know...

Or I will have to give it a try with Charlie and then just go ahead and get the Holley Blue fuel pump with regulator.

Any ideas ?

 

Hey Preacher!! This guy Charlie that you refer to..... Does he have a nickname? Was he originally from Long Island?

 

Weird. I dont ever have any problems with my 600cfm Holley.

 

I may not be up with the current tech , But I think knowing your budget may play a large part of deciding what to run. Are you going to do your own tuning or pay someone else? The same goes for *building* a carb. If you have the skills, thecost can come down alot.
I have run alot of different carb setups over the years. Nikki ,holley, holley pro-jection , weber 48ida and even home made fuel injection. To tell you one is better than the other, i'm sure that some one would argue the good points of each. What I can tell you is the 48IDA is my fave. I normally run EXTREME porting and the weber has the flexibility to match pretty much any port. Mine has been on a stock engine before and ran good. If you decide to run the weber, it will probably cost more initially and is taller than the holley (with air cleaner). If you get a holley, you might try a 4150 in 600 or 650. It would be enough for a ported engine but not to radical for stock.

 

So how much does it cost to convert from a stock nonturbo 88 13B engine to a carborated setup like yours, from start to finish?

 

I have the same setup on two 1988 FC Verts,,, one of them I am going to keep because man I like the power...

On the other which is going full race in a few weeks is getting a turbo and I am selling the Holley 600CFM Carb, Intake Manifold,Holley Freflo Air Cleaner, Fuel Pressure gauge for the bottom price of $650.00 plus $40.00 shipping

Here is the ebay ad: http://cgi.ebay.com/ebaymotors/ws/eB...em=8003228888&

 

You can buy that setup brand new for less than that. I bought an RB mani for $240 and a Holley 600cfm double pumper for $300. Thats only 500 for all brand new stuff, and the carb is more tunable than a vacuum secondary metering plate style carb that you have. If you buy a carb spacer, you can run a box stock holley on a rotary without having to do all the RB mods. Those triangle air cleaners are $20 from Summit racing.