risingsunroof82

iTrader: (3)

Alright, I was thinking on my ride home from work and I think I gotta plan! I'm gonna take my 465 and my spare carb i got my jets from and take the metering plate from the spare, install it onto my 465 stock port carb and continue to tune my 600 to my engine. Then whenever I find the perfect jet size I can just put em in the 465 and run it. That sucker should run like a scared rabbit! The float bowl was already adjusted on the car as was the secondary's so it would be pretty close to setup....... just the jet size is left to be known.
Now heres a question, if i do find out my perfect jet size is just for example 68's...... would they still be the perfect size in my 465 as they were in my 600? What are the jet sizes in a 465 stock port anyways? Well theres a little to ponder over................

RX-7 Chris

iTrader: (19)

no they would not be the same in the 465 as the 600. most likely the 465 would be smaller.

risingsunroof82

iTrader: (3)

Ok, so i put a glass pack in between the cat and the muffler cause it was really loud. But it didn't help much at all but now it seems to have gotten worse ( the stuttering that is)............ I'm running 2.5 with a high flow cat, now a glass pack and a magna flow muffler on the back. Is this possibly too high flow? And why did it change as soon as i added just that little bit of restriction? Now remember it's a glass pack so theres next to NO restriction added than before....... Any thoughts???

RX-7 Chris

iTrader: (19)

I'm not sure about this.

risingsunroof82

iTrader: (3)

I got my jets and I've been doing some tinkering, the 67's still aren't large enough so I'm gonna try the 69's tomorrow and if they don't work 71's.
And now for the good info, lol. I also ordered some jets for the 465. I cracked it open today when I realized the thing already has a matering plate. lol The jets inside were 50's.... really small!!! So I ordered a set of 54, 56, 57 and 59's. I was gonna order 58's but they couldn't order em for me so I opted for the 57's.
This engine just seems to no matter what i do it starts to knock under load or at high rpm ONLY when it warms up........ I'm just hoping it doesn't have anything to do with the internals......... This blocks done it since I've owned the car. I mean if it's gonna blow up it might as well do it fast so I can throw a good stock motor in it! lol Whats your guys thoughts???

Spiker

I have a 12a street port, run 6lbs boost and a Holley 390 mech secondaries, 9lb fuel pump regulated to 6lbs with canister fuel filter . I run 56 main jets and 67 secondaries. It took me a while to get it dialed in as the turbo system is draw through. It holds a good idle at 1200rpm and runs strong through all gears with no sign of fuel starvation. Thought I would just put this out there for consideration.

Rotospeed

iTrader: (8)

pick ONE CARB. and tune it. jumping back and forth will make it pain. imho.

the knock.... i dont know about that one

risingsunroof82

iTrader: (3)

I tried the 69 jets and it has blue smoke now.... must be too big. But it still chatters possibly worse now. Tried timing it but it wouldn't line up, the marks showed up but they wouldn't line up with the red dot.

risingsunroof82

iTrader: (3)

Also, this engine is supposedly a 79 motor so someone had to convert it to elec ignition at some point so could they have missed something? It seems kinda lumpy at idle and if your not acceleratiing it won't keep a smooth idle, it just kinda spitts and spudders....... any ideas guys? If it's not better by next weekend after more work I think it's stock engine and 465 time again.......

RX-7 Chris

iTrader: (19)

Sounds like a big problem with the timing not the carbs. I would start to make sure that the main pulley is set right. Open the access plate on the passenger side of the motor and turn the motor over until the flat spot on the flywheel matches up with the access hole. Then check to see if the marks match up the same. If this is ok then I would move onto the distributor. Get that timing setup starting with the leading and then moving onto the trailing. Get that timing set right before messing with the carb. Also check to make sure that the coils are working right.

I would stick with one of the two carbs and not move back and forth. I would go with the 465.

risingsunroof82

iTrader: (3)

I'm not going back and forth, I've had the 600 on for a while now but gave up on it and since ordered some jets for the 465, I'm just waiting for them in the mail.
I'm pretty sure it can't be the coils cause they're new msd blaster2's. I'll check the flywheel thing, do you mean the cover on top of the tranny that is right between the motor and tranny and you can see the flywheel in it? And what marks will i be looking for on the pulleys cause theres a couple different one......... some messed with it. Hmmmmmmmm. and should they be perfecly lined up with the pulley and flywheel? Then whats it mean If they don't line up?

RX-7 Chris

iTrader: (19)

Not the access on the top of the tranny. There is a second access the is on the passenger side behind the exhaust mani (meaning towards the back on the car). What could have happened is when they messed with the car they could have put the pully on wrong because it has 4 small bolds and nothing keeping it from being set wrong. I think the white mark on the pully is real close to TDC so when you set the flywheel to TDC just look and see if the white mark is real close to the indicator and not a 1/4 or 1/2 turn off. Once that is set, check the distributor.

Also check the plugs, wires, cap, and rotor.

risingsunroof82

iTrader: (3)

Well couldn't you just check it from the top plate too? Or can't you see the flywheel good enough from there? And i'm pretty sure all the wires, dist, cap and rotor are good. Everything like that was from my running very well stock engine except the wires, I'll swap them too just to be sure.

RX-7 Chris

iTrader: (19)

you can see the flywheel but you need to make sure that the flat spot is to the pasenger side.

risingsunroof82

iTrader: (3)

Ok, so when the flat spot is facing the pass side the pulley should be TDC? Cause i checked it with the top plate out and when the flywheel was flat spot up the white marks were facing straight down......

risingsunroof82

iTrader: (3)

I took the cap off the dist and one of the prongs on the inside of the cap was bent and all hacked up, I think this was my knocking sound and it only did it when it was acdvance the timing when going up in rpm. So I changed it with another I have but it still does it. I know for a fact it's sitting on the dist completely........ whats going on?!?!?!

RX-7 Chris

iTrader: (19)

I could be something bent in the distributor? Did you change out both the cap and rotor or just the cap?

risingsunroof82

iTrader: (3)

just the cap........ soon to be rotor too! lol

risingsunroof82

iTrader: (3)

I just changed the whole dist all together...... still yet to find out if it worked........

risingsunroof82

iTrader: (3)

Alright so update time.... the dist didn't work but in the mean time I finally got my 54 jets for my 465 and I got it on there and running. It's STILL chattering but WOW what a difference in power! The 465 works so much better! And now here come the "I told you so's"! lol
But it's still chattering so I'm not happy yet........ I was thinking.... again......... could it possibly be something off the wall like tranny chatter or clutch chatter? Maybe they didn't torque the bolts enough? The thing seems good till you hit any resistance or push it. I'm completely baffled and I'm just about ready to call it quites and say it's something internal. They must not have assembled it corectly or something.............. But there is one more thought in my head. I know the stock motors like low octane but what about when you start porting?????? Could it be det knock from not high enough octane? I do run the low grade......... any thoughts fellas?

RX-7 Chris

iTrader: (19)

I still run low grade gas with the sp and I have no problems with the car.

It could be the clutch, tranny, driveshaft, etc. It depends on where the noise is coming from.

I would maybe start another thread so others look at it.

rxtasy3

iTrader: (2)

this chatter u speak of and the mention of a previous owner may have changed out the dist. if this is actually a spark knock ur hearing, it's not good. make sure the dist is timed right. only other way the marks wont line up right is if the pulley isn't oriented right.

risingsunroof82

iTrader: (3)

I've turned that pulley in all 4 possible positions and only one way will even show the timing marks when using a timing light. And that position doesn't match the one it should be at......... it shows the light when you have the flat part of the flywheel on the oposite side of the marks.

orion84gsl

iTrader: (5)

I TOLD YOU DO I TOLD YOU SO!!!!.

Sorry, I am just being a dick.

Definitly could be the timing. When I went to Deal's Gap I leaned the carb out a bit trying to get some decent fuel economy out of it, and I know my timing is advanced, although not sure by how much, and it was bucking a bit and sputtering (read: detonating)at steady cruise, so I had to richen it up.

risingsunroof82

iTrader: (3)

Thats fine orion.
This is so wierd tho...... it pulls crazy hard when it's still warming up but as soon as it gets warm it knocks......... what could that be??????? I'm really frusterated............ I think I'm gonna start another thread for this prob.........