any one know if a 12a from '87 would be different from a 12a from 83?

trying to fit one into my 83'GSL..

it seems that the excentric shaft is different?!

-Cheers

 

12a from 87? correct me if i'm wrong, but i thought 85 was the last year for new 12a's.. all 2nd gens have a 13b..

 

well on the engine tag it had made in July 87..
so maybe its a crate motor?

 

Well what's the difference with the shafts?

 

i think the hole at the end of the shaft (that goes into the gearbox) is shallower..
so when you bolt it on tight to the gear box.. it just catches on it...

any one know if it could be fixed?
(dont weanna drill coz it might stuff up the balance?!)

-Cheers

 

Huh? There's a pilot bearing in there, right?

Do you have something to compare it with? Measure it! How much are we talking about here?

 

I am not sure if this is correct or not, but I was told by someone, who races rotaries, that there are differences in the e-shaft between JDM and US models. He said that the japanesse versions have a deeper hole in the end of the e-shaft. Since Bolox is from Oz, it is likely that his car is like the JDM version, right?

Bolox: Do you know where the engine originated from? The only options that I can think of to fix this is to either switch the e-shafts between the two engines, or switch the input shaft on the transmission.

If I remember correctly what this guy told me, the hole on the US e-shaft is about 1" deep or so while the JDM version is more like 2".

I don't have any first hand experience between the two versions, so this may not be correct. I thought that I would throw it out there.

Bolox: If you could measure the depth of the hole of each e-shaft, that would be great.

Kent

 

I've had experience with JDM (nitrided R5) 13Bs. Nothing looked different about the pilot bearing holes in them compared to a US '83-'85 12A E shaft. I think the 20B pilot hole is like the other E shafts I've seen.

 

gel-se addict.. ill see wht i can do.. pretty busy with uni atm.. but hopefully ill get to see my baby on the weekend...

and also. if i had to swap the eshaft then i could prolly just rebuild the old engine yeah?

i dont think i can swap the inpout shaft from the transmision coz on car is auto (where i got the new engine from) and my car is manual..

ahh.. othet than that, any ideas hows ot fix it?

jeff20B.. i think they are different.. coz that seems to be the only thing thatsnot working..

(basically.. if im in anything but reverse.. it in gear (1:1).. and if im in revers,, it out of gear.. hmm... not very drivable )

thanks for the help guys...

-Cheers

 

Bolox, how about taking a diaindicator to the hole and measuring it, and then posting the numbers you come back with?

 

coz i dont know what the F*%K that is

 

So now I am confussed.

Bolox: You are saying that you put an auto engine into a manual transmission car, correct? Is it completely bolted in (no gap between the engine and transmission)? Because from your previous posts, it sounded like the engine wouldn't even bolt up to the transmission completly. On the new engine, you did rembember to put in the pilot bearing, clutch and flywheel, right?

Kent

 

didnt get to see her this weekend...

but i was wondering.. would the balancing be alright if i got the hole machined a bit deeper?

engine does bolt up completly.. and yeah they are all there

-Cheers

 

alright..

got to work on her today, and follwed some advise that if i grind off the spigot in the gearbox about 5mm it should fit...

and low and behold it did..

also.. found out that the engine WAS built in '87.. but it had been rebuilt since then with a 78-79 shaft in it..

hmm.. now i just need to hook eerything up.. and i'll be laughing..

excpet for thr fact that it has just started rainging over here so i cant oipen here up to her full potential for a coupla months

anywho.. hope this help for anyone else trying to fit a 78/79 motor into a later gearbox!

-Cheers