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- เผยแพร่เมื่อ 14 ก.พ. 2023
- Does more compression make a mini bike faster?
Did some speed tests with the Predator 212 powered Coleman CT200U-EX minibike with a thick head gasket and then swapped out the thick gasket for a thin head gasket to see if the bike would pick up performance?
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Instagram - Doubledown555Black66
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Parts used -
.020 ARC billet rod - www.arcracing....
ARC billet flywheel - www.arcracing....
Head gasket - Predator 212 PRO SERIES head gasket-www.ebay.com/i...
Head stud kit - www.ebay.com/i...
Champion shaft mounted rockers - www.ebay.com/p...
VM22 Mikuni carb kit - www.amazon.com...
GX 160 head - www.amazon.com...
265 series cam and 22lb springs- www.ebay.com
Don't forget to leave a comment to let me know if you enjoyed this video! :)
*********Disclaimer*********
Please do not try to re-enact or recreate anything you see in these videos.
Black66 does not take any responsibility for injuries or equipment failure created by doing so.
ALL BLACK66 CONTENT IS FOR ENTERTAINMENT PURPOSES ONLY.
![[UNCUT] เพื่อไทยดันอุ๊งอิ๊งนั่งนายกฯ หลังเศรษฐาถูกถอดถอน | คนดังนั่งเคลียร์ | 15 ส.ค. 67](http://i.ytimg.com/vi/SpprmDJ6QEE/mqdefault.jpg)
I appreciate the video and the tip! I'm curious as to what gear ratio were you using? I still have some things to add but 60mph is my goal and changing sprockets might be next! Thanks for the great content!
Thanks! In this video the bike was running a straight chain. A 6 to 1 ratio, 10 on the clutch and a 60 on the rear sprocket.
Get a 15t sprocket for the clutch bell housing get a flywheel, cam, valve springs, and a 22mm mikuni clone carburetor and 60 mph is definitely achievable my mini bike does 74mph on gps
I still think you have the perfect format for doing a "tav2 tuning" series. people are always asking what is the best color spring and pre-load position in the driven pulley for their application. I'm sure there are tons of people that would really enjoy that information.
For the best acceleration yellow spring in the tightest hole. You want the highest RPM possible at the belt shift.
Yesss! Finally you do tests that these other mini bike/ go kart TH-cams couldn’t do for years!
I paused at 6:50 to say that my guess is one point of compression should be about a 4% change in overall power across the curve not just peak.
I expect to see a very miniscule difference in performance in this particular application.
However with that said it certainly will not go faster with lower compression ratio!
Edit : about 1.5mph top speed is quite a big difference! Love the testing methods and showing the data!
Compression rules!
It's "free" horsepower.
These engines will easily run on 11:1 static compression on pump gas over the stock 8.5ish.
Don't go so crazy as to run a cam without the compression release but man, pump em up to 12.5:1 and run 100 octane unleaded or even e-85 if you are looking for performance!
Compression and a good cam will almost triple your horsepower in these applications.
what a lot of people dont get is that different fuels need to be compressed differently. would be great to see fuel comparison with compression changes as well.
I have some fuel comparison videos.
Octane is a value given to gasoline for it's resistance to combust when mixed with air.
Higher octane fuel is a "slower burning" fuel to keep it simple. It's needed and used when the static and dynamic compression is enough to induce pre-ignition or detonation due to heat of compression.
Yes different compression levels both static and dynamic require different octane, or different fuels is a more common way to say it rather than different fuels require different compression ratios. The comp ratio will determine your fuel octane needs.
Puts a lil pep in ur step haha!
On a real note: as you step up performance you must step up compression ! = more foot pounds of torque = More hp !
Imagine doing a point of compression comparison via head gasket swap at the track with your drag car! With a minibike this process is soooo much easier and less work!
Beautiful scenery in this video
Great video, good comparison of the head gaskets. That was cool that you did the change out there. Thanks for the videos! 😉😊💯💯
I would have thought it had a lil more of an effect on the power. Sweet video. Giving us the knowledge.
If that road you were riding on was sandpaper, it looks like it would be around 40 grit
Old asphalt sitting under a hot sun. The road rash would be brutal.
Make sure you use grade 8 bolts. I'm running a Tillotson 212 and my chain was coming off. Unfortunately I put a chain tensioner on it. I'm running 10 tooth Torx clutch and a 60 tooth rear sprocket. I weigh 200 lb. Replace the clutch and found out the engine pulled the threads out of my front- engine Bolt. lost the original bolts and put cheap ones in.. I feel like an idiot.😂😂😂 thank you so much for your videos.
Nice video. Thanks. Be curious to see the difference between more compression vs more valve lift?
Curious as well
Does adding one ounce of marvel mystery oil to a tank of gas decrease or increase performance.? would be interesting to know,Thanks'.enjoy all of your vedios!
I wish I can see my chain tensioner setup I would run for the hills lol it's like 4 sprocket attachments all tied together like one BiG happy family lmao I realized the regular wheel one didn't give enough tension so I guess I'm gonna push my motor forward and go back to str8 chain in it lol oh god
I want to know anything about minibikes I go to your videos...thanks !
Fuel and spark plug gap show how much the higher comp can make a difference without it it not much as noticeable
Thanks! Check out the video on spark plug comaprison. th-cam.com/video/b5NtReHHxas/w-d-xo.html
Lovin' these comparison videos!!! I was wondering if you could compare a flat top piston to the stock piston?
there are different pistons the flat top is actually shorter than the stock one unless you specifically order the taller flat top
I miss that bike. Lol she's a beauty
Ya, it is a cool bike!
Excellent vid boss I wonder what str8 chain VS. Chain tensioner numbers looking like
My testing has found zero difference. But there is something to be said about low rpm takeoff from a standing start and also chain flutter at speed in regards to overall "feel" and more importantly chain reliability
How come you didn’t check compression psi just to get a reading and then compare that for future builds on a CNC head . And just over all info
That's a great point. Camshaft specs play a big part too in cranking compression numbers but for comparison in this vid with just a point change in static compression via a head gasket, cranking compression numbers could be valuable info
Thankyou for the video. Are you use a gopro on your rides. Thankyou
Yes
@black66 any good links to stand alone turnsignal and break light kit. With switches that mount on handle bars.
I don't have any yet. I'll get to some lighting videos sooner or later.
I just found out my engine got a 60mm gasket...omg 😳 now that's thick
What fuel octane? I remember the ol days cutting coke can for Briggs head gasket LMAO!
Those were the best days! I was running VP small engine fuel in this video. 94 octane
Thanks for showing a nimbie carb now mine goes so much faster
Dam 61 mph she fast!!
i see a layer of basalt in them outcrops
Hey black it's me again lol just wanted to know how I get that GPS app on the screen
Its a program in the Go Pro software. You can also use telementry overlay .
@Black66 love it hey man ......thanks
@Black66 if my calculations are accurate the jiggawatt reader is saying I'm at 1600 rpm at idle
I have compression problem with my built predator 212 so far I have installed a billet rod, billet flywheel, 265 hot cam , 22lb valve springs and it has really bad on the pullback what do suggest BOSS? @Black66
Is the compression release not working?
@@Black66 I set the valves both at 3,000’s and still nothing. Do you think it could be the cam?
@@Black66 I did double check that valves and it got a little better, do you think not putting the flywheel right might be causing that im sorry I’m asking to many questions I just got into mini bikes and im liking it but this problems im having is making me think I mess something up. By the way I’ve watch all your videos😃 watching your videos motivated me to try doing it my self 😅 but you make it look easy 😆
Check the compression release, valve lash, and timing lineup between the cam and crank.
black im getting a new clutch for a tilly 212 and im trying to get 60 mph would a jump from 10t to 16 be good?
I have a Tilly 212 stage 2 and a 12 to 60 ratio got me to 65
IMHO, not good video info. If some person is running a hemi head with a +.020" rod, and flat top piston, then change to a .009" head gasket, the exhaust valve will hit the piston at that rpm. Maybe not today, maybe not tomorrow.... but it will hit eventually. "CHECK YOUR PISTON TO VALVE CLEARANCE" when working with a hemi head. Non hemi heads will allow much more room for error, IMHO.
Either way hemi or non-hemi, once the head is torqued down make sure you have at least 0.035 clearance between the piston and either valve during the engine's rotation. And having a higher compression ratio is always more horsepower.
I’ve got a 212 non hemi. Completely modified. +.020 rod. I just got a flat top piston and a .010 gasket. Will it work?
🤠👍👍👍👍👍👍👍👍👍👍👍👍👍👍
I thought there would be a difference in quickness. Not a real difference in speed.
It's a matter of higher compression makes more power over the entire power curve, therefore mph is greater with more static comp ratio
What octane fuel?
94 octane VP small engine fuel .
Black66 I have a question. I recently bought a vm22 carbeurator set for my Coleman mini bike. I installed but the bike will not run. It putts a few times and stalls. Won't idle. It'll fire though. Any ideas anyone? I need help :(
Have you looked at this? th-cam.com/video/b5bY-1gIWWk/w-d-xo.html
@@Black66 As it turns out, that's what it was. I made sure the pipe was lined up with the carb and turned the air mix screw out a lot and now it runs! :D