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stronger gearboxes? Help plz

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Morris 1100

Post subject:

Posted: Wed Apr 25, 2007 7:15 pm

Causing or creating vexation

Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124

First gear is not straight cut, it just has no syncro. :wink:

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Spaceboy

Post subject:

Posted: Wed Apr 25, 2007 7:15 pm

1360cc

Joined: Mon Nov 01, 2004 4:36 pm
Posts: 7673

>Rude< wrote:

yer u can deffinately tell 1st gear is straight cut, i usually short shift first gear for that reason.

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>Rude<

Post subject:

Posted: Wed Apr 25, 2007 7:17 pm

998cc

Joined: Thu Sep 07, 2006 8:37 pm
Posts: 501
Location: Nthside Brisbane

like i said earlier, i dont kno much about gearboxes, take it easy :roll:

_________________

1968 Morris Mini Deluxe......sold

1992 Toyota Starlet GT EP82

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Spaceboy

Post subject:

Posted: Wed Apr 25, 2007 7:18 pm

1360cc

Joined: Mon Nov 01, 2004 4:36 pm
Posts: 7673

Morris 1100 wrote:

First gear is not straight cut, it just has no syncro. :wink:

first gear is straight cut
http://www.minimania.com/web/Item/22G1096/InvDetail.cfm

second gear
http://www.minimania.com/web/Item/22G10 ... Detail.cfm

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>Rude<

Post subject:

Posted: Wed Apr 25, 2007 7:21 pm

998cc

Joined: Thu Sep 07, 2006 8:37 pm
Posts: 501
Location: Nthside Brisbane

Spaceboy wrote:

second gear
http://www.minimania.com/web/Item/22G10 ... Detail.cfm

i think thats wat i may need :oops:

find out tomoro neways

_________________

1968 Morris Mini Deluxe......sold

1992 Toyota Starlet GT EP82

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drmini in aust

Post subject:

Posted: Wed Apr 25, 2007 7:23 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

Morris 1100 wrote:

First gear is not straight cut, it just has no syncro. :wink:

You better go take another look, they all are straight cut, 3 synchro or 4.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Morris 1100

Post subject:

Posted: Wed Apr 25, 2007 7:25 pm

Causing or creating vexation

Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124

Spaceboy wrote:

Morris 1100 wrote:

First gear is not straight cut, it just has no syncro. :wink:

first gear is straight cut
http://www.minimania.com/web/Item/22G1096/InvDetail.cfm

second gear
http://www.minimania.com/web/Item/22G10 ... Detail.cfm

Ok, you got me!

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>Rude<

Post subject:

Posted: Wed Apr 25, 2007 7:28 pm

998cc

Joined: Thu Sep 07, 2006 8:37 pm
Posts: 501
Location: Nthside Brisbane

also whilst on the topic of gearboxes, is it bad to downgear or not?? i dont wanna have to rebuild the gearbox again, wanna make sure everything is right!

_________________

1968 Morris Mini Deluxe......sold

1992 Toyota Starlet GT EP82

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slinkey inc

Post subject:

Posted: Wed Apr 25, 2007 7:28 pm

1275cc

Joined: Wed Jun 14, 2006 9:45 pm
Posts: 4031
Location: Adelaide, SA

According to my workshop manual 1st is straight cut.

Later gearboxes have synchro on 1st aswell :wink:

I guess to know you want to quote th number on the front of it, and go to http://www.hotbricks.org.au/techtips/articles/gearbox.txt

PS - I've been told some of the numbers on of engine and boy numbers (different page) are incorrect so these amy not 100% correct.

<edit> everyone got in before me on that one. And down gear? You can't say in top forever! I guess dropping it down a gear and flooring basically thrashing is not good, I generally change down as I slow down so when it's time to accelerate im alrady in the correct gear as opposed to braking in top gear down to 40 then dropping it into third to take off. If that makes any sense.

_________________
1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

Last edited by slinkey inc on Wed Apr 25, 2007 7:33 pm, edited 1 time in total.

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drmini in aust

Post subject:

Posted: Wed Apr 25, 2007 7:32 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

>Rude< wrote:

also whilst on the topic of gearboxes, is it bad to downgear or not?? i dont wanna have to rebuild the gearbox again, wanna make sure everything is right!

Using the gearbox to slow down with from high speed is worse for the engine than the box. It's the prime cause of cracked centre main bearing caps.
So says Sydney's #1 Mini performance engine builder...

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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>Rude<

Post subject:

Posted: Wed Apr 25, 2007 7:39 pm

998cc

Joined: Thu Sep 07, 2006 8:37 pm
Posts: 501
Location: Nthside Brisbane

anything else i should be doin to take extra care of the gearbox other than smooth changes and clutch?

_________________

1968 Morris Mini Deluxe......sold

1992 Toyota Starlet GT EP82

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drmini in aust

Post subject:

Posted: Wed Apr 25, 2007 8:30 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

>Rude< wrote:

anything else i should be doin to take extra care of the gearbox other than smooth changes and clutch?

Yeah-
Change the oil every 1500 miles, filter every 3000. Works for me.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Lillee

Post subject:

Posted: Thu Apr 26, 2007 9:31 am

1360cc

Joined: Tue Jun 01, 2004 3:41 pm
Posts: 6858
Location: Special Tuning Sydney

Sorry for entering this conversation so late but:

OK let me get this straight, you have a worked 1100 and you are worried about the gearbox being too weak? Forget about it. Get a good 4 synchro box of your choice, rebuild it properly. Mini gearboxes are pretty tough, and for those who think otherwise don't forget that any gearbox will be on average 25-30yrs old in current condition, so it is no wonder that some of you have problems. Let's see how good Toyota/BMW/[insert modern manufacturer here] are in 25-30yrs time...

When I was rebuilding my engine, i wanted the best down the bottom that I could get (and afford) and the conclusion I came up with is just to rebuild a good 4 synchro box. My research sort of ended with these 2 facts:

Grant (Boostedmini) ran a supercharged 1310 for about 1-2 years or so. He made 140? hp or there abouts and his gearbox was fine.

DrMini who runs a 125ish hp car for like 4-5 years on the same gearbox. No problems so far.

I am currently running a 1330cc 120hp donk on a stock std, fully rebuilt 4 synchro box and I have all the confidence that the gearbox will outlast the engine.

Engines and Gearboxes don't destroy themselves, the problem lies between the steering wheel and the seat.

_________________
Lillee - 1969 Morris Mini K

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dove grey 64

Post subject:

Posted: Thu Apr 26, 2007 10:05 am

1098cc

Joined: Fri Sep 09, 2005 3:36 pm
Posts: 1581
Location: melbourne

i agree with lillie, build it properly and you shouldnt have issues. matt the mini man has a 1500 stroker with a standard box and its fine.

_________________
real men race downhill - keiichi tsuchiya

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