Chung yang 4 bolt engines

[sickboy]

Hi all so just news that there is 2 x new 4 bolt engines coming out.

F230
New Version Engine:
1) 4-Bolts Crankcase
2) 4-Bolts Cylinder
3) New Piston
4) Powerful Clutch Spring
5) Lighter Clutch Shoes
6) Big Muffler
7) Star shape bolts



F – 230 Specification

Model (2 Cycle Gasoline Engine) F-230 (New) R-230
Cooling Type Air Cooled
Displacement cc 22.5
Bore mm 32
Stroke mm 28
Max. Power PS / rpm 2.5/ 13,500 2 Two Bolt 23 2.2 / 11500
Max. Torque kg-m / rpm 0.154 / 10,000 Two Bolt 23 0.145 / 9500
Min. Fuel Consumption g/PS . H 500 Two Bolt 23 550
Max. rpm at no load rpm
Compression Ratio 9.5 Two Bolt 23 9.2
Fuel Recommend Pre-mixed (25 Gasoline : 1 Engine Oil)
Oil Recommend FC grade 2 Cycle engine oil
Ignition Type TDI
Carburetor WT-668
Spark Plug Std. NGK: CMR7H
Starter Recoil
In rpm 8,000 5900
Clutch
Stall rpm 10,500 Two Bolt 23 8000
Length mm 158 Two Bolt 23 168
Overall Size Width mm 240 Two Bolt 23 150
Height 199 Two Bolt 23 197
Weight kg. 2.24 Two Bolt 23 2.56

F270

F – 270 Specification
Model (2 Cycle Gasoline Engine) F-270
Cooling Type Air Cooled
Displacement cc 27cc
Bore mm 35 x 28mm Stroke
Max. Power PS / rpm Unknown
Max. Torque kg-m Unknown
Min. Fuel Consumption g/PS . H 500 Two Bolt 23 550
Fuel Recommend Pre-mixed (25 Gasoline : 1 Engine Oil)
Oil Recommend FC grade 2 Cycle engine oil
Ignition Type TDI
Carburetor WT-668
Spark Plug Std. NGK: CMR7H
Starter Recoil
In rpm Unknown
Clutch
Stall rpm 10,500 Two Bolt 23 8000
Length mm 158 Two Bolt 23 168
Overall Size Width mm 240 Two Bolt 23 150
Height 199 Two Bolt 23 197
Weight kg. 2.24 Two Bolt 23 2.56

I don't know much about the delivery times and so on, im sure Chris will be able to shed some light on this .
would be very nice option :dance:

[Clubin]

Good idea, unfortunatley from what I have herd they are not compatible witht he Zenoah 4 bolt engines. I hope they are.

[mooman007uk]

that's weird, maybe zenoah has a good patent lawyer or ten now,at least zen now has 36mm 4 bolt option

[kipster]

The Chung Yang Four Bolt Engines are available to order at this time. We have inspected samples of the F230 and the F270. We have concluded that the cylinders and top ends are interchangeable with the Zenoah 4 bolts. Also in the process of doing a dyno comparison test with the Zenoah 4 bolts and the CY 4 bolts with the different sizes available. There is always a conrtoversy on which would have a more usable powerband. The 35mm Boire or the 36mm Bore. People always have a tendency to want to buy the largest size available. When a bore gets to a certain size, it detracts from the transfer port volume, unless the entire cylinder casting will allow for the ports to be enlarged. Our suspicion is the 35mm may be a better engine size. It may b awhile, but we will keep you updated on the testing of the engines. Check here to see photos from a [URL="http://www.emjayltd.com/recent-news/chung-yang-engine-specs/cy-releasing-new-engine/chung-yang-f-230-disassembly/"]:top secret:

[x Wild Bill x]

Sweet, thanks for that link Kipster, it's nice to see what goes into them for once! Can't wait to see the dyno testing, if you have open use of the dyno, it may come in handy when people start producing new pipes for the Nutechs...

Bill

[VancouverHobbies]

Good info, this link work a bit better. :)

http://www.emjayltd.com/recent-news/chung-yang-engine-specs/cy-releasing-new-engine/chung-yang-f-230-disassembly/

[x Wild Bill x]

Just finished reading that, very well written and good detail! Thanks. Do you think these will be an option in the Nutech's and do you think they will make any more power or just be more reliable and last longer? Ohh and do you have any pricing on them?

Thanks!
Bill

[Clubin]

Nice that the parts are interchangable.

[mooman007uk]

great link Scott..and sounds like cy have really improved their quality on the 4bolt...it'll be interesting to see the dyno results

[RCKIWI]

Very interesting read about the CY motors, can't wait for the dyno tests and really the reliability test, Zenoah have always been the top dog for our car engines ever since they brought in the first 2 bolts G230RC.

[mradlin]

The Chung Yang Four Bolt Engines are available to order at this time. We have inspected samples of the F230 and the F270. We have concluded that the cylinders and top ends are interchangeable with the Zenoah 4 bolts. Also in the process of doing a dyno comparison test with the Zenoah 4 bolts and the CY 4 bolts with the different sizes available. There is always a conrtoversy on which would have a more usable powerband. The 35mm Boire or the 36mm Bore. People always have a tendency to want to buy the largest size available. When a bore gets to a certain size, it detracts from the transfer port volume, unless the entire cylinder casting will allow for the ports to be enlarged. Our suspicion is the 35mm may be a better engine size. It may b awhile, but we will keep you updated on the testing of the engines. Check here to see photos from a [URL="http://www.emjayltd.com/recent-news/chung-yang-engine-specs/cy-releasing-new-engine/chung-yang-f-230-disassembly/"]:top secret:

Some great info there. Thanks for sharing it with us. :dance:

[mooman007uk]

it'll be something else if cy 's turn out to be better...it'll prove to some behind the times naysayers in our hobby (who believe anything made in China is plastic rubbish) that China is totally capable of making high quality goods (already lead the world in shipbuilding and container dock cranes and high tech batteries)...i remember what those same types of folks were saying back in the 60's and 70's about the made in Japan stuff being crap...wow did they ever have to eat their words.
Wonder how much the new cy will be compared to the zen

[kipster]

Just to clarify that the Chung Yang Engines are not made in China. They are made in Taiwan. No, it is not the same. There is a considerable quality difference from China to Taiwan. On another note......Zenoah engines are not necessarily made in Japan. While Komatsu/Zenoah is a Japanese company, their engines are made in many different countries with cheaper labor rates than Japan.

[dc2 man]

ill tell ye something just IMO

when i first broke in the GT5-R i was overwhelemed with the performance of the cy engine,it was excellent.

but the zenoah had a little more bite alright and i noticed it smoother and higher revving.

so zenoah would always be my first choice,but after running nutechs gt5-r i really like cys now too.

[kipster]

ill tell ye something just IMO

when i first broke in the GT5-R i was overwhelemed with the performance of the cy engine,it was excellent.

but the zenoah had a little more bite alright and i noticed it smoother and higher revving.

so zenoah would always be my first choice,but after running nutechs gt5-r i really like cys now too.
One thing to remember, the greatest share of the CY's out in the marketplace are using stroker crankshafts 1 and 2 mm over the standard 28mm Stroke for the standard Cy's as well as the Zenoahs. Longer strokes and larger bores have different power-band characteristics. They generally have more torque, and make best power at slightly lower RPM's than the Std. 28mm engines. When you are talking about the 28mm engines being smoother, that is likely because of the weight and stroke difference from the standard bore & stroke combos to the big bore strokers. This is not just a CY Zenoah thing, but is standard with all types of engines of any size. Another thing that may be overlooked is, the crankshafts need to be checked for trueness and run-out, if vibration is considered to be excessive. Removing and installing drives, clutches and coupler with out the use of the proper tools and pullers can easily knock a crankshaft out of true.

[TMRperformance]

good to see you here kipster!

on the new cy 4 bolt engines topic , i am very excited to get my hands on them... the new improvements are geared toward performance. just like mentioned the 35mm bore has happier transfers than its larger competitor the 36mm. the new port locations, combustion chamber and transfer design are looking excellent in the eyes of someone looking to make power. the plating looks to be of great quality as well. i plan on doing big things with these engines, and feel that they may end up outperforming even the bigger zen engine. i have had much luck with cy engines in the past and now with their revisions i feel even more inclined to build more of them!


Just to clarify that the Chung Yang Engines are not made in China. They are made in Taiwan. No, it is not the same. There is a considerable quality difference from China to Taiwan. On another note......Zenoah engines are not necessarily made in Japan. While Komatsu/Zenoah is a Japanese company, their engines are made in many different countries with cheaper labor rates than Japan.

amen to that! this man speaks the truth and from many yrs experience!

[kipster]

Checked with ADA Racing and DDM. They both have 4 bolt engines on order and said they should hit the States in 30 to 45 days.

[mradlin]

Checked with ADA Racing and DDM. They both have 4 bolt engines on order and said they should hit the States in 30 to 45 days.

That's great news kipster!

Thanks :yahoo:

[NUTECH RACING]

We have already placed trial order to CY , end of April ,will have some CY 27cc 4 bolt in stock.

[skip]

We have already placed trial order to CY , end of April ,will have some CY 27cc 4 bolt in stock.

This is great news, 4 bolt is the way to go

[RCKIWI]

Just received my samples and will be fitting to my TB2 Pro for racing this weekend:yahoo:
They are fitted with Lighten clutch shoes and 8k spring, all bolts are Torx head!

http://i885.photobucket.com/albums/ac58/Nutech-NZ/Nutech%20Off%20roads/CYF270Engine1.jpg

http://i885.photobucket.com/albums/ac58/Nutech-NZ/Nutech%20Off%20roads/CYF270Engine2.jpg


Can't wait to try out and compare to Zen!

[Clubin]

Just received my samples and will be fitting to my TB2 Pro for racing this weekend:yahoo:
They are fitted with Lighten clutch shoes and 8k spring, all bolts are Torx head!

http://i885.photobucket.com/albums/ac58/Nutech-NZ/Nutech%20Off%20roads/CYF270Engine1.jpg

http://i885.photobucket.com/albums/ac58/Nutech-NZ/Nutech%20Off%20roads/CYF270Engine2.jpg


Can't wait to try out and compare to Zen!

One thing is forsure, it makes a lot more power than the Zenoah. I am curious to see what the quality is like.

[RCKIWI]

Well I think the Zen 4 bolts are under rated for there output HP so the only true way would be to dyno them both out of the box at the same time!

But yes i will be interested to see the longevity of these as well as power.

[RCKIWI]

Well only managed 1 litre of fuel through the engine at 60% throttle setting so far and just when I was about to go out for the next tank and open it up a bit more the rain gods decided to come down at Taupo track today:damn:

[mradlin]

Well only managed 1 litre of fuel through the engine at 60% throttle setting so far and just when I was about to go out for the next tank and open it up a bit more the rain gods decided to come down at Taupo track today:damn:

It sucks when rain stops the fun. :beat dead horse:

What did you think of the engine so far?

[RCKIWI]

It sucks when rain stops the fun. :beat dead horse:

What did you think of the engine so far?

It's coming into our winter here so you have to expect some rain outs:damn:

At this point motor seems responsive but will give full report once I have throttle at 100%

[mradlin]

It's coming into our winter here so you have to expect some rain outs:damn:

At this point motor seems responsive but will give full report once I have throttle at 100%

Sounds good Bryan. I look forward to hearing your thoughts on it.

[TMRperformance]

sorry ive been gone so long, i had some family issues and health matters that had to be taken care of.

i did dyno testing on the g270 and the f270 both completely stock and also with a few dyno pipes.

i have actual dyno #'s which i will dig up but here is my findings.

both make around the same hp, but the f270 makes more tq of course due to the 2mm stroker crank.

the g270 worked well with several aftermarket pipes where the f270 was a little more picky, again due to crankshaft stroke and transfer port timing.

in vehicle testing the f270 in completely stock form seems a little doggy compared to the g270 since its not as peppy. but gear it up and it can pull the gear better than the zen.

with a simple exhaust change the f270 really shines! i know it doesnt pertain to the nutech guys but the ddm dominator for the hpi baja worked very well along with a jetpro dual bleed.

now for bigger news! i did take the f270 and re-work the exhaust port ONLY! and i am amazed at what a difference it made! the zen did not respond as well to the mild exhaust adjustment. i was able to coax out well over 5hp with this modification!

i put the engine in a dirt oval car with a jetpro pipe for an event in indiana, the hpi baja it was in ran a large set of 19/55 hostile gears. some guys had larger engines, some smaller, and most guys had much smaller gearing, such as 17/57 and 18/56. well despite the fact that we couldnt keep tires on the car, we placed 2nd in our first oval race and had the second fastest lap time running the outside of the track against the track owner. im going to link a video to that race in this post, hopefully the video will be there when you go to view it... its the red and black rocket! anyhow i want to add just a few more things b4 the link. i would like to say that the engine was very fuel efficient and very reliable! we put test runs of 15-20 laps a few times and then a 50 lap qualifier and then around another 40+ ... this engine has since been in multiple applications and thrashed! im awaiting its return to tear it down and inspect plating, bearings, and such to see just how the new cy quality is. i doubt i will find anything wrong due to the fact that its still running flawlessly as of now. btw the race was in june of this year and the engine has been used quite a bit since then! i will post pics after the tear down.


http://www.youtube.com/watch?v=tRM4x1E5ZYg

[mradlin]

I'm glad to hear you have the health and family issues worked out Al.
Your baja RIPS!! That looks like you have quite the engine in there!!
I saw some representation of my driving style in there..."throttle control?? How's that work?" LOL
How long before members can get a hold of some TMRperformance engines?

[TMRperformance]

believe it or not we had a team losi driver driving that baja, he never drove a 5th scale b4 that!
the engine and pipe were mine and the baja was owned and built by a guy that lived in indiana. goes by the screen name of highwaystar usually.. not sure if he is active on here.

anyhow, im working on getting some inventory so i can get some head kits and long blocks available. im also working on setting up a fixture for a cnc machine so i can offer cnc ported top ends. not that cnc is better than by hand or mill, just much quicker and easier. i have prototype heads that will be scanned and turned into programs, after that all my cylinders will be done this way and then hand detailed.

im only going to be doing 4 bolt cnc top ends, if someone wants a 2 bolt i will have to hand port it, and it will have to be a special order.

im getting away from the 2 bolts as much as possible just for the simple fact that the 4 bolts make more power. im an engine guy and im all about power so this seems like the most logical thing to do.

very soon i will start taking orders for engines and top end kits, regardless if the cnc is ready or not. most likely within the next week or 2. i will take pm's for pricing and such.

my biggest thing now is what im hoping to release right after the holidays!
not sure if i should speak of exactly what it is right now, cause i learned in this industry if you open your mouth you better be able to deliver soon b4 someone goes and does it b4 u!

anyhow i have something that will work for all 4 bolt owners and will increase hp and tq, not to mention throttle response! its a piece i have developed over a year ago and just finally made the last refinements!

[Futterama]

I've got the F270 with a rear mounted TB2 Jetpro but haven't even started it yet, it's winter with snow here right now. Can't wait for better weather so we can get outside and race.

I'm looking forward to see what you've got to reveal for this engine.

[TMRperformance]

ok news update...lol..

just got my f270 that has been in the field since june of this year. it has been in a few different applications including and edm car which is plenty of punishment to test plating longevity and bearing life.

i took the cylinder off and inspected the area around the exhaust port where i had prted it, figured why not start at one of the hottest points , i then looked in the combustion chamber where the plating in the past has failed, then the transfer area and intake side where i did more porting... well folks i have to say that the plating looks great! im very impressed with how well the cylinder and piston look.

as for the engine bearings, there is absolutely no up and down or side to side play, they are as tight as the day i built it!



this engine was ported and modified, this was done to speed up the process of failure if there were to be any at all..

so far in my opinion and field testing i give the new f270 an A+!

pictures to follow shortly!

[mynameismud76]

Sounds good Al, look forward to more testing results.

[mradlin]

The results sound great so far Al!
Keep up the great work. :excited:

[hndaman1]

My new 4bolt CY is also here:yahoo::yahoo: and with some mild porting this thing is going to rip...