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> chevy v8 and 901 1st gear ?, why should 1st not be used ??
jimkelly
post Jan 29 2007, 08:56 AM
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is it more a problem of not being good to downshift into 1st from 2nd or is it more of a dead stop start in 1st - could destroy tranny and why ??

thanks

jim
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Dr. Roger
post Jan 29 2007, 09:24 AM
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1. It's the weakest gear and many have blown it.

2. 901's are geared for a 4/6 cyl. engine and is very low. Too low for a V8. Have you noticed that it is "etchy" when applying the throttle. So much torque comes on so quickly and causes a surge/jerk forwards and back and forward and back. It's controllable but ...
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jimkelly
post Jan 29 2007, 10:01 AM
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Yes - I have only driven my car about 100 feet so far in 1st gear only - as I have no shift linkage yet : )

It seems to me that 1st might be good for only up to - what - 10 mph ??

For next short joy ride - I plan to manually put it in 2nd gear : ))

Jim
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sean_v8_914
post Jan 29 2007, 10:03 AM
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first gear hangs off teh end of the cluster supported by teh shaft on one side only. torque of a v8 is a bit much for it there. you can use 1st to move around teh yard or to put it on teh trailer...and what teh good DR said
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Aaron Cox
post Jan 29 2007, 10:46 AM
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its cantaleverd off the intermediate plate with only a bearing on one side.....
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alpha434
post Jan 29 2007, 11:52 AM
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Dude. First gear is fine.

If you need to do any rock crawling, it'll be there!
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jimkelly
post Jan 29 2007, 12:00 PM
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me and ROOT rebuilt a side shift for my v8 conversion that we finally got moving under its own power - sort of - yesterday. i know i could have blocked off first gear but figured - what the hell - fix it up too - must have had rock climbing in the back of my mind : ))

so anyway ...

ratio not much use with v8
canterlevered = weakness

thanks guys

jim
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Mid_Engine_914
post Jan 29 2007, 12:06 PM
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It's not a good idea to use the 901 tranny with a motor with that much hp.

http://www.914world.com/bbs2/index.php?sho...=66161&st=0
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jimkelly
post Jan 29 2007, 12:18 PM
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thanks for link - i will keep all posted on my experiences - jim

no hard clutch dropped launches are planned - my v8 is mostly for a bit of added hustle and reliability.

easy - gradual - peddle depressions are my intention : )
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messix
post Jan 29 2007, 02:19 PM
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can you say BOOM!

actually gavel gravel gravel [the sound of nuts and bolt in a coffee can when stired]
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jimkelly
post Jan 29 2007, 02:28 PM
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from downshifting in to 1st from 2nd ??

from dropping clutch at 3000 rpm ??

from simply mashing the gas in 2nd ??

jim



QUOTE(messix @ Jan 29 2007, 12:19 PM) *

can you say BOOM!

actually gavel gravel gravel [the sound of nuts and bolt in a coffee can when stired]
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messix
post Jan 29 2007, 02:50 PM
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anything involving first gear above idle.

then anything that would break the tires loose in the wet.

no clutch drops [300-400 ft lbs torque + small gears,syncros and thin shafts= boom!]
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fiid
post Jan 29 2007, 03:40 PM
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I guess the issue is that if you block it off you probably won't break it, but if you do break it off - you're not going to be able to use the broken shaft anymore... you'll have to find another one. It's not going to break in the right place such that you can keep using it - so you might as well set it up so you can't break it and save yourself the issue later.

It's not necessarily going to be something intentional... you might have wet feet and your foot slip off the clutch or something.

While you're in there - you'll probably want a taller 5th. I only have a subie motor and I want a taller 5th... (IMG:style_emoticons/default/smile.gif)
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jimkelly
post Jan 29 2007, 05:14 PM
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taller 5th - i will cross that bridge when I get to it.

can't imagine needing it for as sub - max rpm is higher than type4 - isn't it ??


don't really want to spend any more bucks if I can help it.

i am cool with running 65 mph at 3500 - i think - except maybe for mpg's : )

i'll let you know though ??

jim
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messix
post Jan 29 2007, 07:22 PM
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ahhh a V8 at 3k on the freeway for an hour is against the Geneva convention for cruel and unusual punishment.
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jimkelly
post Jan 29 2007, 07:32 PM
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now that is funny - i will confirm or refute this to be true as soon as i can - within 30 days I hope - thks - jim
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QUOTE(messix @ Jan 29 2007, 05:22 PM) *

ahhh a V8 at 3k on the freeway for an hour is against the Geneva convention for cruel and unusual punishment.
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messix
post Jan 29 2007, 07:52 PM
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just "ask the man who owns one"!

[old packard sales line]
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sww914
post Jan 29 2007, 08:18 PM
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If you floor it in first, you can twist the end of the shaft right off. I've seen one. That's the short term- the long term is the cantilever problem, mauling it in first all the time will blow out the bearing or worse. If you baby it in first you'll be fine, until something else goes.
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messix
post Jan 29 2007, 08:21 PM
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i would think first would be good to have to idle it up on a trailer if thats your thing.
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pffft
post Jan 29 2007, 08:57 PM
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QUOTE(messix @ Jan 29 2007, 06:21 PM) *

i would think first would be good to have to idle it up on a trailer if thats your thing.


Yeah, that's my thinking. I have a long steep dirt 1st gear
driveway and some very tight turns to get into the
garage. I know my 2.4cis motor was fairly happy starting
in 2nd, and I figure my very mellow 327 makes much more
torque at idle, but for getting from the road to my garage the
six was not AT ALL happy in 2nd.

Hopefully I'll find out soon.

patrick
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