I've two transmission woes I need help resolving.
First, I'm not the first owner of any of my Hondas. I'd like a way to verify that the proper transmission is in the cars without/before dropping the transmission. The serial number is a no go as they are all SL3-5serial#. I've crawled under the cars and read the stamp on the transmission housing but I understand that is no guarantee of what is in the transmission. I've read numerous posting on several forums about counting the engine rotations required to rotate the tire once. I did that and the numbers I got are nowhere near what they should be. While there are many variations, they all say basically the same thing. Here is the one I followed for my test.
Quote:
Transmission In Car
A. Jack up front driver’s side of car and place a jack stand under it. Shift the transmission into
reverse.
B. Take a paint pen or marker and place a reference mark at the 12 o’clock position on the
driver’s side tire and another mark at the 12 o’clock position on the crankshaft pulley. Using
a socket and ratchet on the crankshaft pulley bolt, rotate the engine counterclockwise and
count the number of revolutions that the cranshaft pulley makes in order to rotate the tire
exactly one complete turn. The number of revolutions will tell you which Final Drive you
have. (See Chart Below)
C.
12.25 Revolutions = 3.88:1 DX (or ZC)
12.75 Revolutions = 4.05:1 EX (also some 90-91 Civic Si)
13.40 Revolutions = 4.25:1 Si
Anything less than 12.25 Revolutions = HF (three different ratios were available in HF)
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And here is my transmissions' info:
#1-DX - 6.2 x2= 12.4 PL3/A100 SL3-5#
#2-DX - 6.2 x2= 12.4 PL3/A100 SL3-5#
#3-SI - 6.8 x2= 13.6 PL3/9000 SL3-5#
Additionally, since what is left of the engine in the White DX didn't require any effort to spin, I put it into every gear and counted.
1st 6.4 x2= 12.8
2nd 3.7 x2= 7.4
3rd 2.4 x2= 4.8
4th 1.8 x2= 3.6
5th 1.5 x2= 3.0
R 6.2 x2= 12.4
I believe that what I've read is correct because when you multiple the transmission ratio by the final ratio you get the number of engine turns per 1 revolution of the tires. Yes??? No??? It sounds right,... Soldiering on:
transmission ratio X final ratio = engine revolutions
1st 3.250 X 3.880 = 12.610
2nd 1.894 X 3.880 = 7.349
3rd 1.259 X 3.880 = 4.885
4th 0.937 X 3.880 = 3.636
5th 0.771 X 3.880 = 2.991
DX R 3.153 X 3.880 = 12.234
SI R 3.277 X 4.250 = 13.400
Oddly, if you double my measured numbers you get close to the calculated numbers, certainly within the relm of my eyeballed measurements.
What am I missing?
Second, the other transmission woe is that the White DX's engine overheated to the point that a rod connecting a piston to the crankshaft bent, hit the bottom of the cylinder wall, and brought the engine to a very sudden stop. This happened long before I owned it, I've no idea what happened to the transmission at that point. Is spinning the engine over enough to get roughly 12 revolutions of the tire a valid way to test the transmission under no load? It spun nice and smooth in all gears so I'm thinking that it'd not be a waste of time and effort to put it into the SI.