That background music in the beginning is rather fitting in this pandemic world. We're all dealing with a "Bad Shipment" or two these days, what with everything being sold out or on back order. Awesome bit of music. :-D
Thank you for all the great content. I'm newly getting into mini"s and trying to get as much Quality information as I can. This channel is my go to channel! Thank you from Australia
Great thank you for explaining the differences with dog gears. I've never known what the differences were, so thank you for taking the time to educate us.
i am looking at building a gearbox for a hill sprint mini. i have a bare gearbox case and need to buy literally everything. I would like to see a video on the modern tech diffs as i will need to decide which one to buy in the near future. Great channel and keeps me enthused to complete my build.
Just wanted to add to your excellent summary of 'Straight Cut' gears that these are stronger because the contact area per 'tooth' is greater than a helical gear which is transient contact. I think that is why racers prefer straight cut. The other factors you mentioned are welcome bonusses. Also wanted to ad I love building these gearboxes. They are just wonderful pieces of application design. I am sure many people have used the Bias Spring on Rod Change 'boxes to bias the lever to the 3 to 4 plane but we used to use a coil spring between two washers on one of the internal rods on the Rod Change 'boxes to get the same bias on the earlier cars.
.. helical gears have a longer length and are always in contact they are stronger and quieter while straight cut gears are shorter length and have a clearance which is constant they are much noisier they rattle
I just want you to know your video was anxiously awaited. I was having some withdrawal symptoms! The best part was at the end as I think that suggests the new engine worked. As a Spridiget viewer, I was keen to hear about how the head gasket performed with "decked" pistons and whether that was a solution...or if he story continues? Someday I am going to build up a second engine for my "Frog Eye"..
Another great video... its amazing seeing some fine details. I always heard about dog gears but didn't know the difference. Great explanation and nice Sunday watch.... 👍
Hi Paul great video as always. Could you please talk about different ratios for the crown wheel/pinion. On a road car this could help with cruising or acceleration. I live in western NSW Australia where there are long highway straights and few tight corner roads. I wish to use a 3.2 ratio diff as opposed to the 3.44 ratio diff I currently have in my 1970 1310cc Cooper S. What are your thoughts. Thanks Carlo.
Super explanations on the gearset Paul. Love the racing footage. How much in terms of power/torque loss to the wheels is there in comparison between the helical and the straight cut gears? Is it significant?
Another really great educational video, modern tuners are very lucky to have knowledgeable people such as you to help them. By the way helical cut gears were invented by Citroën, this is why they have that chevron badge. Sorry but I didn't like that music on the race car bit.
Not strictly true, Tony; Citroën invented a mechanism capable of cutting gears with chevron or double-helical teeth, which avoided the end-thrust generated by single helical gears, which is why their badge reflects the chevron. Helical gears had already been around for a long time at that point.
An interesting look into the guts of the diff, do you have a recommendation on what diff ratio to use on how you use your mini ? ie. track , fast road , motorway . Would this be the same on engine size or will this change with cc ? Great vid well worth the wait , nice touch at the end 👏👍.
Brilliant as ever, Paul! So much useful information, and a very valuable explanation of the difference between synchro hubs and dog engagement. A couple of questions: One thing you didn’t touch on was the reduction in end thrust with straight-cut gears, as compared to helical-cut. Is this a worthwhile reduction in power loss, do you think? You’re also clear on the fact that there is extra wear of a straight-cut gear, but I don’t understand why. Is it because of clearance and wear issues with the tooth profile, or just because straight-cut gears tend to get a harder life in more powerful motors and competition conditions? Thanks and best wishes from Scotland Will
Hi Will, deep and complex subject that one, but yes your are correct in both cases. Straight cut gear teeth come in and out of contact which generates wear and the production of swarf. Good point regarding thrust and I will touch on this in the next video
Awesome description of different gearbox gear sets and diffs.
That background music in the beginning is rather fitting in this pandemic world. We're all dealing with a "Bad Shipment" or two these days, what with everything being sold out or on back order. Awesome bit of music. :-D
You should make a race video without music, the sound of a tuned Mini is more than music enough 😄 your videos are very inspiring 👍🏻👍🏻
Thank you for all the great content. I'm newly getting into mini"s and trying to get as much Quality information as I can. This channel is my go to channel! Thank you from Australia
Great thank you for explaining the differences with dog gears. I've never known what the differences were, so thank you for taking the time to educate us.
Great tech video..first Ive watched..cheers 👍🏻
Great to have you back......
Thanks buddy 👍👍
Totally loved the video. I am interested in a deep dive into the modern diff tech. Also interested in some discussion on Cam and Pawl diffs
Once again an excellent video, on the Mini boxes.
The Mini dog box works similar to a motorcycle gearbox, without reverse, but they last a long time.
Probably because of their weight?
Always interested to learn about different types of LSD's
👍
i am looking at building a gearbox for a hill sprint mini. i have a bare gearbox case and need to buy literally everything. I would like to see a video on the modern tech diffs as i will need to decide which one to buy in the near future.
Great channel and keeps me enthused to complete my build.
Great footage.
Just wanted to add to your excellent summary of 'Straight Cut' gears that these are stronger because the contact area per 'tooth' is greater than a helical gear which is transient contact. I think that is why racers prefer straight cut. The other factors you mentioned are welcome bonusses.
Also wanted to ad I love building these gearboxes. They are just wonderful pieces of application design.
I am sure many people have used the Bias Spring on Rod Change 'boxes to bias the lever to the 3 to 4 plane but we used to use a coil spring between two washers on one of the internal rods on the Rod Change 'boxes to get the same bias on the earlier cars.
.. helical gears have a longer length and are always in contact they are stronger and quieter while straight cut gears are shorter length and have a clearance which is constant they are much noisier they rattle
I just want you to know your video was anxiously awaited. I was having some withdrawal symptoms! The best part was at the end as I think that suggests the new engine worked. As a Spridiget viewer, I was keen to hear about how the head gasket performed with "decked" pistons and whether that was a solution...or if he story continues? Someday I am going to build up a second engine for my "Frog Eye"..
The story is continuing Jud but for different reasons. so far the gasket and piston decking has done its job 👍
Once again a great job of explaining these things thank you Paul look forward to the next video
Paul a great teacher a programme on diff's would be great
Great stuff 👍
Great video Paul especially after watching your other one on stripping the gearbox. Stripped my first one the other day just followed what you said.
Great to hear you found it helpful Ronald, and congrats on your first gearbox strip
Another great video... its amazing seeing some fine details. I always heard about dog gears but didn't know the difference. Great explanation and nice Sunday watch.... 👍
Thanks Paul for the racing film, definitely want to see more,
I got my my hoodies order, loved the quality and design!
Thanks so much for your support Eduardo, I’m delighted your happy with the products 👍👍
Hi Paul great video as always. Could you please talk about different ratios for the crown wheel/pinion. On a road car this could help with cruising or acceleration. I live in western NSW Australia where there are long highway straights and few tight corner roads. I wish to use a 3.2 ratio diff as opposed to the 3.44 ratio diff I currently have in my 1970 1310cc Cooper S. What are your thoughts. Thanks Carlo.
Another great video Paul, the track footage was awesome 👌
Thanks Paul the next one will be longer 😆
Super explanations on the gearset Paul. Love the racing footage. How much in terms of power/torque loss to the wheels is there in comparison between the helical and the straight cut gears? Is it significant?
Thanks Paul for replying my interest past video and following me on Instagram 🤣
your most welcome 👍👍
Straight cut on a Sunday what more do you want!!
Glad you enjoyed 👍👍
Another really great educational video, modern tuners are very lucky to have knowledgeable people such as you to help them. By the way helical cut gears were invented by Citroën, this is why they have that chevron badge. Sorry but I didn't like that music on the race car bit.
Not strictly true, Tony; Citroën invented a mechanism capable of cutting gears with chevron or double-helical teeth, which avoided the end-thrust generated by single helical gears, which is why their badge reflects the chevron. Helical gears had already been around for a long time at that point.
@@willgrime Thanks for the information, you're never too old to learn.
An interesting look into the guts of the diff, do you have a recommendation on what diff ratio to use on how you use your mini ? ie. track , fast road , motorway . Would this be the same on engine size or will this change with cc ? Great vid well worth the wait , nice touch at the end 👏👍.
Thanks Guy, I will spend a bit of time talking about this on the next video 👍👍
What are your thoughts on the helical LSD. Have you had much to do with them?
Brilliant as ever, Paul! So much useful information, and a very valuable explanation of the difference between synchro hubs and dog engagement. A couple of questions:
One thing you didn’t touch on was the reduction in end thrust with straight-cut gears, as compared to helical-cut. Is this a worthwhile reduction in power loss, do you think?
You’re also clear on the fact that there is extra wear of a straight-cut gear, but I don’t understand why. Is it because of clearance and wear issues with the tooth profile, or just because straight-cut gears tend to get a harder life in more powerful motors and competition conditions?
Thanks and best wishes from Scotland
Will
Hi Will, deep and complex subject that one, but yes your are correct in both cases. Straight cut gear teeth come in and out of contact which generates wear and the production of swarf. Good point regarding thrust and I will touch on this in the next video
Damn that is one sexy shirt.