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R/C Tech Forums Thread Wiki: The Official BLOK Engines Thread
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The BLOK engines are based on the OS Engines XZ-B Spec II. Carburetor and carb inserts are the only differences. The 22C carburetor is used on the 21aM and comes with 6.0 and 6.5mm venturi. The 21J is used on the 21aP and comes with 6.5 and 7.0mm venturi.

More info can be found here
BLOK 21aM
BLOK 21aP

Replacement parts

All OS Engines .21 XZ-B Spec II parts will fit the BLOK 21aP and 21aM engines. The only difference being the 21aM uses the 22C carburetor.
A good selection of replacement parts can be found here.

How to set endpoints for maximum fuel economy and drivability.

These engines are very powerful, which IMO is a good thing as it's challenging to modify an engine to produce additional power from what it was designed to without sacrificing durability or longevity. With a little tuning, you get the best of everything, great power, long runtime and a long lasting engine.

We chose our new engines because they're extremely reliable, easy to tune and make incredible power... but wasted power is wasted fuel! What most people don't realize is that with these engines the power can easily be turned down to increase mileage and drivability. Also, engine temps are reduced, and your engine will last longer. When tuned correctly and with correct EPA/clutch settings you should be able to get 10-minute pits easily.

First and foremost, the key to extended run time is to reduce wheel spin. Reducing wheel spin is paramount because if you are increasing throttle and the vehicle is not accelerating, fuel is wasted. Think about it like this, run time is roughly equivalent to mileage and if you're using more fuel to go the same distance, mileage goes down. Run time can be maximized by reducing the throttle end point and/or by adjusting clutch settings or using a different clutch.

Let's work with endpoints first. I recommend starting with the 6mm venturi in a buggy and the 6.5 in a truck unless you are on a very high grip track or need additional power. Set the throttle pull on the bench by using a set of calipers and measuring the distance from the mid needle to the low needle. Wide open throttle (WOT) with a 6.5 mm venturi should be about 61.7 mm or 62.2 mm with a 7.0 venturi. You can also adjust WOT by removing the air filter tube and verifying the slide pulls one point past the venturi at full throttle.

In a truck, we generally keep the EPA at 62.2 mm as trucks generally weigh more and have additional traction due to the larger tires but in a buggy, our engines generate quite a bit of power and can be a little difficult to drive.

For this reason, we recommend turning down the EPA on buggies and we've found the optimal setting when measured from the mid to low needles to be roughly 59.6 mm. Turning down the EPA does two things; it makes the vehicle much easier to drive without sacrificing top end and significantly reduces wheel spin which improves runtime. If you feel that you need additional power, increase the throttle EPA and retune the engine. Typically we only increase the EPA on high traction surfaces or tracks where we need a little more power out of the corner to clear jumps.

Next is the clutch. With the clutch, you can adjust the power delivery and 'feel' of the engine. If you have very good throttle control changing the clutch might not be as important, but with me, this helps a lot. Like I mentioned before, a truck can typically use all the power our engines generate and we recommend an aluminum flywheel, but in a buggy, we usually recommend a steel or heavier flywheel.

A steel flywheel can help provide a more linear feel to the throttle especially on low to medium grip conditions. IMO a steel flywheel is very important and should be used almost everywhere with the 21aM engine in a buggy. If traction is low or you feel that the buggy still has too much power, carbon shoes can also be used to help smooth power delivery.

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Old 02-17-2017, 02:09 AM   #1
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Default The Official BLOK Engines Thread

Tekno RC Unleashes BLOK Engines!


As any RC racer knows, engines are an extremely important part of any race program. They are arguably the most important component besides the chassis itself. After a lot of thought and careful consideration, we have produced a new line of nitro engines that offer a unique blend of efficiency and power. Tekno RC is happy to announce the BLOK 21aM and 21aP engines!

The BLOK 21aM was designed with optimal fuel mileage in mind for 1/8th buggies, while the 21aP is all about power and is well suited for any 1/8th application! Both engines feature the same long stroke piston and sleeve design, DLC coated crankshaft, three needle carburetor and efficient cooling head. Both engines are manufactured to the highest standards of precision in Japan.

Detailed Specs:
  • Displacement: 3.49 cc/ 0.213 cu.in
  • Bore: 16.27 mm / 0.641 in
  • Stroke: 16.8 mm / 0.661 in
  • Output: 2.55 ps / 2.59 hp @33,000 r.p.m
  • Practical R.P.M: 4,000~40,000 r.p.m
  • Weight: 362 g / 12.77 oz.
Availability: Late February.


Product Links:


Please click here for more product pics.

Part Numbers: TKR1710, TKR1711


Engine part numbers/links:


MSRP/MAP: $469.99
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Last edited by Ilias; 07-14-2017 at 05:17 AM. Reason: Engine parts added
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Old 02-17-2017, 02:20 AM   #2
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This is much anticipated. Can't wait to hear more about it from end users.
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Old 02-17-2017, 06:30 AM   #3
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nice work Tekno....those are sexy little beasts
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Old 02-17-2017, 06:56 AM   #4
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all the secrecy for a spec 2 and spec 3 xzb with steel bearings?
hopefully they can hit the price point low enough to take some sales from hobbico
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Old 02-17-2017, 07:07 AM   #5
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Originally Posted by HaulinBass View Post
all the secrecy for a spec 2 and spec 3 xzb with steel bearings?
The carb and venturi sizes are the differences between the 2 engines.
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Old 02-17-2017, 07:17 AM   #6
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Cool Ill wait till neal opens one up for the real scoop
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Old 02-17-2017, 07:19 AM   #7
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Originally Posted by HaulinBass View Post
all the secrecy for a spec 2 and spec 3 xzb with steel bearings?
hopefully they can hit the price point low enough to take some sales from hobbico
Do some research before you make yourself look dumb.
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Old 02-17-2017, 07:20 AM   #8
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Cool Ill wait till neal opens one up for the real scoop
No one needs to open anything up. The specs are above. Pretty easy to tell by reading the info what they are and the differences between the 2.
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Old 02-17-2017, 07:24 AM   #9
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Quote:
Originally Posted by Areno View Post
Do some research before you make yourself look dumb.
might want to cool it with personal attacks, so research would be what?
the bore and stroke are identical, its a three port sleeve with allot of exhaust duration and a crank with fairly open timing numbers. Im guessing they went more conservative on the crank timing as the spec2 and 3 are pretty much as far as you want to go on crank timing without having a drag specific motor.

Im not stupid when it comes to motors , show me the internals and I can make a pretty good estimate on what it is and how it performs.

Thank you Jeff for the info on the inserts

Any way to get one of the pre production boxless engines without paying full M.A.P?
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Old 02-17-2017, 07:34 AM   #10
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No problem
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Old 02-17-2017, 07:42 AM   #11
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Quote:
Originally Posted by HaulinBass View Post
might want to cool it with personal attacks, so research would be what?
the bore and stroke are identical, its a three port sleeve with allot of exhaust duration and a crank with fairly open timing numbers. Im guessing they went more conservative on the crank timing as the spec2 and 3 are pretty much as far as you want to go on crank timing without having a drag specific motor.

Im not stupid when it comes to motors , show me the internals and I can make a pretty good estimate on what it is and how it performs.

Thank you Jeff for the info on the inserts

Any way to get one of the pre production boxless engines without paying full M.A.P?
It's a Hara Edition with the Worlds head. Just look at the specs. They changed the carb on the M version. Yes u need to take it apart to figure that out. Fml. Don't be butt SOAR...
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Old 02-17-2017, 07:48 AM   #12
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Quote:
Originally Posted by HaulinBass View Post
might want to cool it with personal attacks, so research would be what?
the bore and stroke are identical, its a three port sleeve with allot of exhaust duration and a crank with fairly open timing numbers. Im guessing they went more conservative on the crank timing as the spec2 and 3 are pretty much as far as you want to go on crank timing without having a drag specific motor.

Im not stupid when it comes to motors , show me the internals and I can make a pretty good estimate on what it is and how it performs.

Thank you Jeff for the info on the inserts

Any way to get one of the pre production boxless engines without paying full M.A.P?
You are correct, the bore and stroke are exactly the same as the xzb spec 2 and spec 3. looks to be about 30 bucks cheaper then the xzb spec 3.
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Old 02-17-2017, 07:51 AM   #13
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I run the SOAR car yes, and if i didnt sign with them there was a good chance id be running for tekno in canada. Im interested thats why im here talking
I like motors, I have a large collection and my daughter also races nitro truggy and buggy and shes free to run whatever she or i want to put in her cars.

aww man that soar butt joke flew over my head on first glance haha
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Old 02-17-2017, 07:52 AM   #14
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Originally Posted by HaulinBass View Post

Any way to get one of the pre production boxless engines without paying full M.A.P?
They are currently available for purchase now, but boxes and literature not available till later. Teknorc or Lutzrc. Just read the details on how to order now or b/o.
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Old 02-17-2017, 09:21 AM   #15
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Hello Everyone,
We are very excited to finally release the BLOK engines to the public! After testing many different options we found a combination of engines that are amazing in buggy and truggy. Since OS has moved on to the Spec III, we saw an opportunity to bring sharp styling and great off-the-shelf carb options on what we believe to be the best engine ever produced by the best engine manufacturer. With the proper radio settings and clutch these engines produce excellent run time and very controllable power. Time will tell but we are confident our customers will see these as a top engine in the market.

Did we hype them up a little, of course! We're excited about them and we think our customers will be too!
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