speeddemon32

iTrader: (3)

how can you tell the pulley is on correctly? the pulley goes onto the pulley hub 4 differant ways.

My guess would be that the "key" in the E-Shaft, means something. maybe something like if the key is up, then the engine is on TDC. and the pulley would go on accordingly with the timming marks up?

can anyone verify this with experiance.

thanks to anyone that can help!

scales.removed

if the key is at 9 o'clock your rotor 1 is at TDC.

I'm a 77 repu owner

skils74rpu/81rx7

i got a repui can tke a pic but it would have to be tommarrow

partly mazda

if you take the crank bolt out to see the keyway you can lose the thrust bearing stack and mess up the motor
be careful
john

speeddemon32

iTrader: (3)

THANK YOU, THANK YOU, THANK YOU, THANK YOU, THANK YOU.

you have no idea how much that helps.

for those of you wanting to know why i am asking this question, i have a second gen drag car, and some of the internals are from a truck. and of course the pulley can go on 4 differant ways, i am not used to this. i am used to tyhe pulleys only going on one way. i have dome as much searching as i can, but cant find anything on the trucks. even tried the truck forum.

maybe you can answer another question, what is the compression ratio?

also they are 3mm seals factory right?

(if you havent caught on, i had an engine builder build it, this is why i dont know as much about it. i built the last engine but it was all RX7 parts)

...... now for the longer story, I can't get the car to start, after trying to start it for many many many hours, we finnaly got it to start up for about 5 seconds maybe 10, then it stumbled to not running any more (ran out of fuel in the bowl, left the fuel pump off) we tried to start it again, and nothing..... it wont start again. we have tried for a few hours now, and are very fustrated with it.

the compression is 60 pounds in the front rotor, and 70 in the rear. and yes they were all used parts. we are hoping that once the car does start the engine will start to break in again and gain compression making it easier to start.

we have been moving the timing around trying to find the correct timing, since we cant seem to find TDC. now that i know the ket to the left (whice the hub has a mark where the key is) i can at least be assured i know whare TDC is. and maybe we can push start it.

the reason we want to push start it, is because we can tell the starter is getting weak, after hours of asstarting we can thell the starter is no longer tuning like it use to ( no not the battery, i am smarter then that ) and we can get it close, it will ALMOST start, but it just wont light up. we are hoping that getting that extra spin from push starting it will help.

anyone had problems with 60 pounds of comression.

please let mek now if any of this does not make sense, i have typed a lot today, and i tried to leave some of the unimportant stuff out.


thanks again guys!

scales.removed

http://www.geocities.com/mazdarx05/dizzy1.htm

go here for timing and related stuff

speeddemon32

iTrader: (3)

thanks again man, if your up to it, read above again, i added a lot when you were reading.

scales.removed

http://www.rotaryresurrection.com/ro...r/breakin.html
more helpful info on first fire of a rebuild...

speeddemon32

iTrader: (3)

thanks again man! maybe i will get her to start tomorrow.

any idea on the compression of the Repu, or the 3mm seals?

you have been a lot of help.

scales.removed

compression is usually low on a rebuild until it's broken in...normally around 100.

sounds like you may have "carbon locked" it...if you have ATF or other light lube, put ...better if you read this...
http://members.ij.net/mrmazda/cfaqtext.html#NOSTART

scales.removed

I'm not sure about 3mm seals in the repu motor...I did hear once that they were 3mm from factory...but I've not confirmed that yet.
If yours was rebuilt, it's common to rebuild with 3mm's.

Siraniko

iTrader: (13)

Be sure that the pulley is for that specific 13-B as the 12-A's timing mark is at "0" as in the picture below.

speeddemon32

iTrader: (3)

Wacky! i didnt see you at seven stock. i saw your car, but not you.

thanks for the pics. this would make me think that the bottom picture is at 5 degrees ATDC. correct?

Scales, i ment do you know what the compression ratio of the rotors are? like in a non turbo S5 RX7 they are 9.7:1

repumax

iTrader: (3)

Repu compression ratio per the sales brochure is 8.6:1. I don't know if that is for 74'-77' or a specific year.

speeddemon32

iTrader: (3)

wow, thats rather low, thats low enough compression for boosting. i would have expected something in the 9.x's

well thanks alot everyone for your help. i will be working on it more this weekend, and will let you all know if she ever starts.