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Boring 38mm mikuni carburetor on lathe + engine test
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- Опубликовано: 5 сен 2023
- In this video i machined a 38 mm mikuni carburetor with an eccentric setup to obtain the most area as possible, finishing with an "oval" shape.
At the end there are some clips showing the engine running just after this modification
Beautiful sound!
Nice work. I did this to my Suzuki X7 carbs and got a couple of Hp increase. I left the bottom of the carb too for the same reasons. I think I got it from 26mm to 27.8mm.
Thanks, great result almost 2mm. I have to stop because where the carb connect to the rubber manifold there isn't a lot of thickness. Interesting the test on the increase of Power. Do you have the graphics? Will be cool to see a before and after comparison. Btw i'm subscribed to your channel, good stuff 👍🏻
@@machiningandtuning I checked the results... In my defense it was 7 years ago I did the mod. I actually only got 1.3hp increase and they were in fact bored to 27.5mm. I've added the graph to my community tab and tagged you into it. Hopefully you got the notification?
@@AutoBeta2T Yes, I received the notification and replied on it👍
@@machiningandtuning sweet - the system works 😃
@@AutoBeta2T hehe, yes it seems to work
Sounds sweet
nice work, inspiring
Thanks, glad you enjoyed the process
Bonjour une question pratique le puit d'aiguille est t,il dur à retirer ou pas. Merci Olivier
No it has a light interference fit, comes off easily😉
Is that simply setup with the front spigot in a three jaw chuck? Also, how deep into the back of the carb did you start your boring process? I would like to try this with on my bike.
It depends, you have to analyze your carburetor and find the setup that will work better for you. Not sure what you mean with the 2nd question
Any noticeable differences? Did you adjust jetting etc? Curious as I would like to take a set of 36mm carbs I have on a car and bore them to 37mm but wary of the venturi effect being ruined.
Yes, the engine seem to have a higher peak power, and It pull stronger, especially from 10000 rpm. I didn't notice any decrease in torque on the mid range, I think there are some gain also there. About jetting i haven't done anything yet, but i think that more fuel will be beneficial considering the hypothetical increse in air flow, i'll try increasing it. In general i think that you can give It a go with your car, for sure this is a mod suitable when an engine Is already well tuned and need to find something to make it even better, a loss of time on a stock motor
How did you offset the carburetor in your 3 jaw Chuck?
I’m assuming you added something to one jaw?
Yes, correct. I used a copper soft jaw on one jaw, which turn out to be the right thickness for the offset i needed
@@machiningandtuning thanks - exactly what I was thinking. Thanks for your video, now I’m going to do the same to my carbs.
@@machiningandtuning how much did you open the carb up after you were done? Start size vs finished size?
@@kiltedmoto You're welcome man, glad you found It useful👍🏻
@@kiltedmoto the native bore was 38mm, for the finished size somewhere in the video there are 2 photo where i measured with caliper the new sizes in both directions