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116 Posts Member #: 10945 Advanced Member scarborough/ northyorkshire |
16th Jan, 2016 at 05:42:08pm
hi ,can someone explain why it's ok to run a sc gear box with helical drops or vice verser, I'm building engine and box to take 150 bhp reliabley with mini spares clubman sc gears but using standard drop gears, cheers |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
16th Jan, 2016 at 08:11:54pm
Correctly shimmed drop gears of the later A+ type (larger idler bearing) are perfectly capable of way over 150bhp, ask Robert.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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4307 Posts Member #: 1321 Post Whore Wiltshire |
16th Jan, 2016 at 08:39:13pm
I would also ensure the bush in the primary gear is not worn too. On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding |
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116 Posts Member #: 10945 Advanced Member scarborough/ northyorkshire |
16th Jan, 2016 at 08:53:47pm
there is a bit of play on the primary gear bush but not got a new one to compare,i had 9 thou on idler when i stripped it will be setting to 4 thou,il have to find internal diameter of a new one |
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116 Posts Member #: 10945 Advanced Member scarborough/ northyorkshire |
16th Jan, 2016 at 08:58:19pm
hows fitting sc drops helping a helical gear box tho,is it the combination of the side loads from both at the same time the problem,as alot of people have just sc drops |
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3591 Posts Member #: 655 Post Whore Northern Ireland |
16th Jan, 2016 at 09:07:58pm
On 16th Jan, 2016 fixitphil2 said:
hows fitting sc drops helping a helical gear box tho it isnt. 9.85 @ 145mph
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4307 Posts Member #: 1321 Post Whore Wiltshire |
16th Jan, 2016 at 09:31:22pm
When you compare the section thickness of helical drops there is probably at least 50% more contact patch/section thickness compared to the gears in the box, hence why those are the ones that need uprating. Edited by minimole23 on 16th Jan, 2016. On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
17th Jan, 2016 at 08:22:47am
A primary gear too tight is worse than it being too slack in my experience (within limits of course). Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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 16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
17th Jan, 2016 at 09:04:26am
If you run s.c. drops with a helical gear set, the rest of the box needs to be in tip top condition.
On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it 
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6 Posts Member #: 11097 Junior Member |
18th Jan, 2016 at 09:03:36am
i did the same as apbellamy with less than 150bhp using standard drops and gearset with a 1380, TWICE! I rebuilt the 3rd time with straight cuts throughout, i really dont want to splitting the engine again to fix the box |
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 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
18th Jan, 2016 at 09:54:05am
Take it from me, helical drops and minispares clubman set will take what the engine produces, fit new bearings all around and your sorted.
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 1767 Posts Member #: 9165 Previously josh4444 Australia, brisbane |
19th Jan, 2016 at 10:29:57am
imo its all about how much it gets abused i broke the bearing cage on the dubble roller a timken bearing by the way on a stock 1100 + mild cam if your rough on it then nothing will last but as ive lerant if your kind to it youll get away with more |
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3591 Posts Member #: 655 Post Whore Northern Ireland |
19th Jan, 2016 at 03:09:22pm
On 19th Jan, 2016 Turbo This.. said:
imo its all about how much it gets abused i broke the bearing cage on the dubble roller a timken bearing by the way on a stock 1100 + mild cam if your rough on it then nothing will last but as ive lerant if your kind to it youll get away with more Certainly on the metros...cant recall the number of balls in them. But one type used, every single gearbox I took apart that had it, the cage was always broken. Didnt matter what age or mileage or engine size, they were all broke. If you replaced it with the alternative which had either 1 ball more or less ( cant recall which ), they never really broke 9.85 @ 145mph
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