Rumor...CA20E gearbox beefier?

Discuss topics related to the CA18DE and CA18DET series engines.
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Dattebayo
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I was browsing around the internet and found some interesting hearsya that the CA20E gearbox may be used for a stronger transmission able to take more power, given that the stock driveshaft has to be shortened and a crossmember fabricated.

Is there any truth to this rumor? All I find is speculation...


Sil40sK
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I don't know how true that is, but couldn't you just swap out the gears from the CA20 case to the CA18 case?

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rico05
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HHmmmm. A stronger box for a 2l carb'd n/a? Versus the box on a top trim level, boosted and EFI motor; one of the strongest motors of its type when new? Hmmm. Sounds fishy to me, but you never know.

Sil40sK
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rico05 wrote:HHmmmm. A stronger box for a 2l carb'd n/a? Versus the box on a top trim level, boosted and EFI motor; one of the strongest motors of its type when new? Hmmm. Sounds fishy to me, but you never know.
How is it a carbed motor? Correct me if I'm wrong but dosn't the "E" in Nissan engine codes stand for digital fuel injection? CA20E = 2L fuel injected motor.

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rico05
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Ah, so. My mistake. Over read the noticeable "E" in that LOL. That's called "Egg on my face" LOL.

But in all seriousness, do you really hink it could be? What kind of gearing change are we talking about? How about bell housing adapting to ours? Got any more info on it yet?

Seishuku
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Which trans, 71B or 71C?

If it's the 71C, then it's no different than the KA/CA/SR's 71C (other than gear ratios). The 71B is older, has external shift linkages... We don't know if it's any stronger or weaker than the C box, but I'm going to say that they can take about the same power numbers.

BTW, the S12's trans is shorter than the S13/S14's, so you would have to get a longer prop shaft made.

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rico05
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Quick e-search. and I found that the final drive for the 200SX/Silvia was 4.11:1, so I assume that the gearing is close?

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rico05
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Wow. Good info. Not really a worthwhile upgrade, but still a choice for replacement.

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float_6969
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Are you having problems with your power overpowering the transmission? If not, don't fix it if it ain't broke...

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Dattebayo
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Late answer, sorry!

I was getting an answer for a friend... He was being annoying and talking about handling "500HP" and whatnot. So it was either ask thw question or deal with his blatantly n00bish, over-thinking questions for power he'll never achieve. Thanks for the replies though...
Seishuku wrote:BTW, the S12's trans is shorter than the S13/S14's, so you would have to get a longer prop shaft made.
Now you see, this is news. I have been told that the bellhousing is actually longer than the S13's and that would lead me to believe now that the gear box is (A) shorter than the S13's or... (B) that the information you just said is untrue. I need another trip to the junk yard...

Seishuku
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2BN_S13 wrote:Now you see, this is news. I have been told that the bellhousing is actually longer than the S13's and that would lead me to believe now that the gear box is (A) shorter than the S13's or... (B) that the information you just said is untrue. I need another trip to the junk yard...
Nope, the bells are the same length. It's the rear section that's different in length.I'm using an S13 SR bellhousing (I'm running an SR20DE) on my S12 71C gearbox with my stock S12 drive shaft, no issues... The drive shaft is exactly where it was with my old CA20, and so is the shifter.

If I had used an S13 gearbox on my S12, I would have had to shorten the drive shaft by 10MM-14MM (or use an S13's drive shaft front section) and slot the shifter hole back a little.

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Dattebayo
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Thats some handy information, thank you!

Ive considered building a S12 w/ CA18DET so this will come in handy if I decide to go with it...

ALSO> is the CA18ET transmission the exact same as the CA20?

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yes.

and yes its shorter. and yes the s12 CA20E transmission bolts up to a CA18DET bellhousing or a KA24DE bellhousing (thats what I run in my previously CA20E powered s12)

Sean

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hsoj_v
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Ok here is the thing for me... I've got a Pulsar FF CA18DET engine that I want to put into my S12... will my CA18ET Transmission work with that? What can I do to make this engine convert to a F/R layout?

Seishuku
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The block will bolt up fine, and I've been told that you can swap the throttle body and idle air stuff from either ends, so you can change which end has the throttle body... UNLESS you have the DET with the throttle body over the valve cover, then you don't need to worry about it at all.Other things you'll need to deal with, is the radiator inlet/outlet, heater core lines, exhaust, and a whole mess of wires.But it is possible.


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