 HB gears...found a set |
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| mittelmotor |
 Dec 22 2012, 11:36 PM
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Member  Group: Members Posts: 334 Joined: 21-May 12 From: SoCal Member No.: 14,464 Region Association: None  |
I'm planning on re-gearing my 901 to better suit a V-8. Will pay $200-$250 for an H or HB set, plus shipping. Looking for nice used gears with no galling on the teeth.
Please PM me if you have a set for sale. Thx! --Doug P.S. I found a set for sale |
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| mittelmotor |
Dec 24 2012, 09:11 PM
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Member Group: Members Posts: 334 Joined: 21-May 12 From: SoCal Member No.: 14,464 Region Association: None |
Hi Carl,
Not a dumb question! If they're stock 914 transaxles, 5th gear is a ZD gearset (31 teeth/22 teeth. 0.71 ratio), versus what I want to get: a flipped HB (31/19, 0.61) or flipped H (32/19, 0.59). For me, a flipped H will lower cruising revs at 80 mph to about 3200 rpm, versus about 4000 now. As I understand it, all 4-cylinder 914s throughout the production run had ZD gears for 5th. The H and HB gears come out of other variants of the 901 transaxle as fitted to 911s (and possibly 912s). It's so cool that many of the gearsets interchange, so you can mix and match. But apparently not the HA. (IMG:style_emoticons/default/sad.gif) The flipped 5th makes sense for a big, torquey water-cooled V-8, not so much for a 90-bhp air-cooled flat-4, for a couple of reasons: the flat-4 doesn't really have enough torque to carry that tall of a 5th gear, and it's beneficial to spin the air-cooled engine a little faster at freeway speeds, to keep the fan speed up and enhance cooling. --Doug |
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Posts in this topic
mittelmotor HB gears...found a set Dec 22 2012, 11:36 PM
DblDog Doug,
I have a NOS set of HA gears, with new dog... Dec 23 2012, 09:50 AM
running914
Doug,
I have a NOS set of HA gears, with new do... Dec 23 2012, 04:22 PM mittelmotor I was mistaken on the gear codes. I need either H ... Dec 23 2012, 09:47 PM Evil914
I was mistaken on the gear codes. I need either H... Dec 24 2012, 02:38 PM Evil914
Hi Carl,
Not a dumb question!
If they'r... Dec 25 2012, 03:09 PM mittelmotor A found a set...they should be en route in a day o... Dec 27 2012, 07:10 PM |
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