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Configuring a Hewland race gearbox with different ratio's - Formula Ford and more.
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- Опубліковано 30 кві 2023
- This is the practical video where we install a new set of gear ratio's in a Hewland MK-9 gearbox. At the end , there is an Annex that addresses the comments from the previous video.
Excellent job, Steve! The video quality was superior as well. Thanks for taking the extra time to share.
Thanks Darryl
Steve, thank you for taking us along with you on your journey. Informative video. Can't wait for the Zolder race footage. Congratulations.
Thanks, that will be just after 21 May if all goes wel
Thanks for al the graet videos. I specially like the "down to earth" feeling, the workshop with different machines and also the interest in gardening.
Thank you Steve for another great video! With your videos i've learned a lot about tuning race cars, and tuning cars in general... As a matter of fact i bought a Weber 38DGAS to put on my classic car and also bought a car to build for racing! You're a great inspiration for everyone, even for a 21 year old guy like me! I can't wait for you to post new content each and every time, so keep up the amazing work!
Thanks buddy, its nice to read and see young people sharing the same passion..
Thanks for a very informative video Steve, I have an 83 Van Diemen that I’ve not had very long. I’m only just learning about it never having had a car like this before. I know I have to be able to change ratios quickly and correctly for the different circuits here in Australia. Having watched this vid a few times I’m now going to attempt it. Many thanks
Good luck Rob, I am sure that you will succeed as it is very easy. It looks complicated but its not...
Good video, so nice to be able to select a different ratio for each gear for different tracks.
Thanks Nick
Very good video. After running sedans all my racing life, I purchased a Formula Mazda and I'm coming up to speed on working on single seaters. Your videos are very helpful.
Great two--part series. Very nice
Very interesting, as usual. I didn't know how simple a Hewland gearbox could be.
Gears don't have helical teeth. Must be noisy, but that's for racing purposes.
Thank you.
Indeed a very distinct noise, Thank you
Great film, thank you. interesting to see a gearbox new to me. And thank you for addressing the comments in the last one. Definitely agree on Hylomar over silicone. The other sealant I have used that works well on more permanent things is Loctite 515. Interesting that you put the split pins in the gear box nuts differently to how they came out. You could do a whole film on that alone and expect arguments in the comments!
Thanks for the comments, I was always told that splitpins need to form an anchor... so that is why
@@D3Sshooter Apparently Rolls Royce have a method where you twist the head of the pin 90 degrees so it fits into the slot in the nut fully but then you can bend the legs around the nut as you showed. But I have never been able to find an 'official' source for that. It just gets repeated a lot. Hopefully there is a factory manual or workshop guide somewhere that shows it.
Love your work 👍
Thank you
Well done !
Thanks
wow ! excellent instructional video, I had always been reluctant to try this but having this video as a guide gives me the courage to give it a shot. Thank you very much, will definitely save this video for future ref. ! BTW, great video quality !!! Could you provide the dimensions of that home made tool ?
(The one with the 3 rods)
Nice. Seemed a bit fiddly but not too bad.
Hopefully the gearing will be better for the track. 👍
It always is...when fitting gears without a shaft installed.
Great.
Nice video and thanks for the clarification on the end.
At 26:36
What is the purpose of the rod?
I can see that the front end is threaded. Where does it screw into? Is it to hold things together?
it's job is to hold the input shaft to the layshaft upon engine/trans removal
Hi Steve, thanks very much for sharing your video!
Would it be possible to acquire your excel sheet for analysing the gear ratios?
😎
Steve, I recently purchased a Lotus FF and your videos are very informative in my attempts to learn as much as I can about this car. You mentioned, near the beginning of this video, about a flip chart you created to assist in disassembly of the Hewland. Is the flip chart available for download or purchase? Thank you.
Hi Brian, its something I just made ... I will see how I can make it available in a downloadable form... free of charge of course
Steve, thank you very much and thank you for the very quick reply!
On the rear cover there is a fitting on top on the right hand side. Is that for applying lube to the selector rods where the jockey engages them?
That is an open nipple, kind of a breathing hole
Honestly, Steve, on the track, aren't we always looking for more power? It might actually be more torque out of a turn, but we feel that as power first. Usually in our butt. 😅
Yes indeed, but power on the wheels is provided by the torque... Its a horse and carriage
Is it wrong to have a sequential shifter with a hand hydraulic clutch on the shifter .
The shifter is moved left and right for upshift and downshift so that using the clutch is easy.
Nothing is wrong, the only issue is that the race car will not get FIA approval as per regulations . Only certain things are allowed to be modified. So the answer is " Not allowed by regulation"
@@D3Sshooter wouldn't it be safer and provide advantage to a driver as he/she can shift faster , be consistent and smoother than a H pattern shifter and foot controlled clutch .
One could reduce overall cost and simplify the car .
weight reduction is possible as a third foot pedal is removed and replaced with a hand hydraulic clutch . And since the shifter is side to side rather than front to back the driver can avoid mis shift or Gforce related driver mistakes and also brace himself in corners using a left foot dead pedal. Clutch control will be faster .
Yes as of now it's is against the rules but won't your level of control be more consistent and reduce overall body movements .
And after watching your trackday shake down I am sure you will reduce lap times by a second if not more . Or atleast be faster on race launch till you reach the first corner.
Am I wrong or is this unnecessary.
Ofcourse u could also use f1 style steering controlled shifting and also hand clutch. But the f1 way is expensive and difficult to replicate.
@@TheINDIAN , many things can be better today as you write. However the point in historic FF racing is that all need to compete with cars as they were at the time. That keeps the driving skills as the most importend factor.
@@D3Sshooter I understand. Will this give you unfair advantage for that time .
Never leave A plug loose,
On the pipe used to remove the gear cluster - you say 25MM but is that the I.D or O.D? And how long is it? Thx
What do these dog boxes (gear box) go for in price?
Esa caja de cambio es de beetle modificada
So Dog box have no synchromesh?
No, they don't.. its all straight cut theet. In fact many times whole racing you don't use the clutch..We just jam it in.
The split pin's are not mounted correctly !
I've never heard of a Hewland trans called a ''dog'' box.
Well it is...txs for the comments