HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!

[DVSRX-7]

i seriously dont know anything about carbs, and so this is were my problem begins.

Eeveryone should know about my car now, but for the people that haven't heard of it and its setup then here goes, its a 87' RX7, rebuilt engine with some pretty strong internals (turbo ready engine), GSL-SE Lower intake manifold, Racing Beat upper intake manifold, Mikuni PHH 44mm side draft carburator, 1st gen RX7 carburator (low pressure) fuel pump, Holley Fuel Pressure Regulator.. and i think thats it, i cant think of anything more..

But either way, i need help, because i cant get the engine to start without having some manually choke it for me, and when it does start, it idles at 3k, sometimes 2k, when i push down on the gas pedal, it seems to be bogging/sucking in to much air which makes it cut off.. im not sure on what to do, so please someone come help me out, this message is for those who know how to wok on carb setups, dont want some dumbass NOOB mechanic to come and fuck my shit up, i have put to much money in it already to sell it or have someone fuck it up..

So please IA members help me out, i seriously miss driving my 7. So give me phone numbers, emails, addresses or whatever you have of people/shops who may be able to help me out with my little problem..



Thanks, Roger

[Ziptied]

rebuilt engine with some pretty strong internals (turbo ready engine)

dont want some dumbass NOOB mechanic to come and fuck my shit up, i have put to much money in it already to sell it or have someone fuck it up..

Wait what? strong internals? lol, you must be new to this, if they are na rotors the compression is too high for boost, and if they are turbo rotors then no wonder it runs like ass. Sounds like the n00b mechanic is who built it, Why would you carb it anyways? lmao, put it back to stock.

[Justin51982]

I sent you a PM, call me and I will get you in the right direction.

~Justin

[DVSRX-7]

Wait what? strong internals? lol, you must be new to this, if they are na rotors the compression is too high for boost, and if they are turbo rotors then no wonder it runs like ass. Sounds like the n00b mechanic is who built it, Why would you carb it anyways? lmao, put it back to stock.

yea strong internals alot of racing parts inside, and i might be new to some stuff but when it comes to getting the right parts and building a engine correctly then i know what im doing, as for m rotor's they are NA rotor's, just like i said it was built for either turbo or non-turbo setup, and just because i might not know enough about carbs that doesnt make me a noob, the reason why i carburated it was because everyone else already have the same stuff done to there cars, and like to do stuff differently, theres no point to copy when you can be original.

[Catnip]

the reason why i carburated it was because everyone else already have the same stuff done to there cars, and like to do stuff differently, theres no point to copy when you can be original.

LOL. Your car won't run, but I guess that's the point in doing something "different."

[DVSRX-7]

LOL. Your car won't run, but I guess that's the point in doing something "different."

lol your fucking right, its the price i pay for being different, but then end result will mean everything to me..

[dragoncelica]

I will run eventually it is nothing wrong to change to a carb when it is a perfonmance oriented one like the side draft, first check your timming leading and traling you got to have that perfect before playing with the carb, use the right plugs for a carbed rotary 13b, and then play with the carb, my guess is you are running a carb in your car that was intended for a dual carb set up. if thats the case you need to deal with the pump jets and you may need to go up in main and idle jets who knows if the venturys need to be changed too! by the way it need to be perfectlly sinchronized with the buble tool to ensure both sides are working at the same rate cuz you are feeding each rotor of your engine with only one side of the carb, if i was you i will discard that set up and step in a holley 4 barrel set up! way more powerfull!

[87 Turbo II]

I will run eventually it is nothing wrong to change to a carb when it is a perfonmance oriented one like the side draft, first check your timming leading and traling you got to have that perfect before playing with the carb, use the right plugs for a carbed rotary 13b, and then play with the carb, my guess is you are running a carb in your car that was intended for a dual carb set up. if thats the case you need to deal with the pump jets and you may need to go up in main and idle jets who knows if the venturys need to be changed too! by the way it need to be perfectlly sinchronized with the buble tool to ensure both sides are working at the same rate cuz you are feeding each rotor of your engine with only one side of the carb, if i was you i will discard that set up and step in a holley 4 barrel set up! way more powerfull!

I don't know about the Mikuni 44s but with the dellorto DHLA 48 side draft I have, it flows 400 cfm. A stock port 6-port 13B rotary requires 340 cfm at 8k rpm using the rate of expansion of air in a perfect vacuum and port sizing, so anything above 350 cfm is starting to get oversized. Thus a Holey 475 or Holley 600 will see no gains over a good flowing side draft and manifold. Oversized carburetors actually lose some low end too. Like I said I don't know the flow rates of a Mikuni 44 though.

Also, I know I PMed you but it really does still sound like a vac leak, or possibly jetting. Have you looked up what jets other Rotary Mikuni guys are running? With the Webber and Dell side drafts the 12A and 13B use jets that aren't so far apart that you couldn't run the other engine with same jets (like a 12A would run with the standard 13B jetting and vice versa) so try getting the same jets as one of the 12A guys, buy a few jets close in size and so some tuning. don't forget to drill and tap for your OMP or premix either.

[dragoncelica]

well i was giving an answer taking he said it is a worked out engine he got, and i asume it got some overlap and port done "if is worked" and yeap the 48 dellortho is ok more or less, i really dont like them cuz after you run the holley you'll find out your 13B is not really a 1.3 engine and it will handle more fuel that you may think, remember you are getting those #'s with the flutes or 6 port valves still in place, take em out to feel real power my friend!

Did you put your engine tru a flow bench? dont belive all they said arround in paper or the net, i have work with them for loooong time, not my cup of tea cuz i really like better the piston power, but i know a lot about them being my fastest one in the mid 8's in the 1/4 mile more than 17 years ago, now i know what it takes to make em run in the mid to low 7 seconds in the 1/4, and no i am not only do drag!
The effect that the 4 barrel holley take in the rotary is just amaizing been a progresive 2 barrel first and then the other 2 later while you press the gas pedal to the floor. i am prety sure if you try it youll give me the reason!
i have try both setups, and i can tell you the holley is my prefered set up when a 13b is carbed, otherwise i'll go custom microtech efi, let me know i am the only distributor of them in GA better prices than me impossible!

By the way all you need is a racing beat intake a holley 600 cfm vacum secondaries and some jets a litlle tune and go rip the track or street!
By the way did i tell the parts for holley are easyer to get and cheaper, and if you want to go turbo you just need to go blow tru, ohhh so many advantages!

[David88vert]

I already told you who to contact. He has had that same sidedraft on one of his cars for years.

[Glides]

Well, first off there aren't alot of moving parts inside the rotary to replace with "Race" parts. Rotary....


Secondly, Dragon Celica is right. the best rotarys I have seen running in the 22 years i've been around them run on Holleys. Mikunis and other sidedrafts are great carbs, but I personally like the Ronco Rotosserie method...."Set it and forget it" Can't do that with the side drafts. But you stick a Holley on it and voilah, trouble free running for many moons.

That's my take.

[DVSRX-7]

so i read all the replies, David88Vert i been calling around and havent gotten around to calling the number you gave me bro but ill get around to it

As for the carb!! i dont have money to trade or buy a different one, this one is jetted for this engine, so i know there is something else wrong here, i just need more knowledge about what im doing.

I have even talked to Rolland, cool ass guy, and i will have him check it out before i go to anyone else, he is the only "Rotary Guy" i really trust, i know his dad has taught him alot, and have personally met him at the old school meets, so he will be the first to take the car in, and hopefully the last.

But please do give me ideas/opinions on what you guys think i should do, other than changing my carb setup, i have built everything around this carb setup, so i have no other choice but to make it work, i dont give up that easily so its either make it work or keep reasearching till i do! But seriously DragonCelica, 87 Turbo II, David88vert, and Glides thanks for giving me your opinions/thoughts i know i will be researching what you guys have wrote.. keep them coming please..

Oh yea Chris R, i am going to take everything apart tomorrow again, and im going to put gaskets where they might be missing, and maybe some rtv sealant as well, just to make sure i have no vacuum leaks anywhere..

[87 Turbo II]

Good luck, and yeah if that gasketting doesn't fix it, I'm almost sure Roland will help you solve it (don't type it as "Rolland, he got mad at me for it and said "It's Roland not Roll And." lol) Roland is REALLY smart, and so is Billy Waits from Respeed.

[Me86Rob]

My car has a carb also

[87 Turbo II]

My car has a carb also

lol old school attention whore. "Look at me everyone, I am also old school!"

No offense but unless I got the wrong idea from the post, that was a little pathetic.

[Me86Rob]

lol old school attention whore. "Look at me everyone, I am also old school!"

No offense but unless I got the wrong idea from the post, that was a little pathetic.

naw. im actually trying to get rid of it. I was just lettin him know hes not alone in the world

[DVSRX-7]

naw. im actually trying to get rid of it. I was just lettin him know hes not alone in the world

lol im not trying to get rid of mine though

[87 Turbo II]

My B TE72Rob. REPs to say I'm sorry work for you?

[Elbow]

My car has a carb also

Sweet I've had a few too...

[nisman]

carbs are stinky little bastards... ^hope to make it to sonic one night to meet you athens ppl, just work right down the road at the nissan collision center