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Sirio S21 CL7B .21 Long Stroke

Sirio S21 CL7B .21 Long Stroke

Old 01-09-2008, 03:11 AM
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Default Sirio S21 CL7B .21 Long Stroke

Heys guys, who knows something about or has had some experience with this motor or the evo3 sti
I cant find much on sirio at all
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Old 01-09-2008, 11:07 AM
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Mark,
I've ran this engine most of '07 in my truggy. I was able to TQ 3 of 4 rounds at the truck nats and finish second. I also TQ'd all 4 rounds of the R/C Pro final using this engine. It to me is an awesome blend of power, very smooth and it is a long stroke so it gives a little bit more bottom end, perfect for the truggies but also good for people looking for more bottom on their buggies!
When coupled with either the Sirio 2013 or 2057 pipe it really brings the engine alive. The 2013 is good for all around power, and the 2057 is a little flatter on bottom but seems to have a never ending revving and is super smooth!
All sirio products if not available at your local hobby shop should be available on A-main.
You should be able to expect anywhere from 7.5 - 9 minutes of run time depending on your driving style. It also comes with both standard and turbo head buttons. I personally run the Turbo with a P3 plug.
Regards,
-Ryan Lutz

Last edited by TRCRacer24; 01-09-2008 at 11:08 AM. Reason: add info
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Old 01-09-2008, 04:35 PM
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hey ryan what do they tune like and does it hold tune,
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Old 01-09-2008, 04:39 PM
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for me they have held a tune very well recently. i don't think i've had to change it much more than 4 hours at a time. And that was going from California to Ohio.

If you run locally they hold a tune very well!
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Old 01-09-2008, 04:47 PM
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Sweet motor lots of power, holds tune well. Fit and finish of the motor is second to none. Sirio puts together a very nice engine.
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Old 01-10-2008, 12:39 AM
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THE BEST ENGINE I HAVE EVER SEEN!!!
My brother has one on his buggy...
Crazy engine. From bottom to top!!!
Although he has the STi version.
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Old 01-12-2008, 12:11 AM
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Hey guys thanks for the input. I'm going to order the sti long stroke on monday. Don't think I can afford a pipe yet though, I'll have to try my ttr pipe and see what happens.
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Old 01-12-2008, 06:08 PM
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Mark,

I ran this motor for the season last year and it will be in my ride again for this year. It is fast, lots of power, and lasts a long time. It is an all around great engine. I too run the P3 plug with the turbo button.

Ryan
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Old 01-29-2008, 09:43 AM
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to ryan lutz (or anyone who might have an idea),,

understand you're a team driver for Sirio engines.

what's your opinion abt the new Sirio 2056 pipe? looks weird but wondering if you've tested it?
powerband wise?

i'm looking to get the CL7B, was wondering if this new pipe will work well with it. (like sirio says, "has been optimised to work with the CL7B and Evo3 motors")

any shops carrying the pipe yet?
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Old 02-01-2008, 07:52 AM
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btw, when you guys mentioned P3 plugs,
were you referring to Oh Ass plugs?

afraid to mention brand names here for fear of conflicts..
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Old 02-01-2008, 07:55 AM
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I was told from the onroad guys that the OS turbo plugs leak in the Sirio engines.
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Old 02-02-2008, 01:40 AM
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Ok both Ryans, I got my new cl7b today, Going to ask a newb question.
What fuel mix do you recommend for run in and there after.
I see in the book no more than 15% nitro for run in and use 10% castor with no mention of synthetic.
I normally run 25% nitro 8%klotz synth and 4% klotz castor
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Old 02-02-2008, 06:21 AM
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Originally Posted by marki View Post
Ok both Ryans, I got my new cl7b today, Going to ask a newb question.
What fuel mix do you recommend for run in and there after.
I see in the book no more than 15% nitro for run in and use 10% castor with no mention of synthetic.
I normally run 25% nitro 8%klotz synth and 4% klotz castor
Sounds like old school Italian break-in method. Low nitro, high castor oil. Contradicts the new way guys break-in engines by using the same fuel they race with. Try Omega 5% or 10% fuel for break in. Its low nitro and has 17% synthetic/castor blend. Its aero fuel, but I have used it on many engines and so have others here in forums with no issues. Gets engine hot enough, without getting too lean and plenty of lube for break-in. I've been eye-ballin getting one of these CL7B's to try.
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Old 02-02-2008, 08:00 AM
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Does the CL7B have enough low end torque to run
in a truggie?
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Old 02-02-2008, 08:24 AM
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rageworks,

this article might answer your question..
http://www.redrc.net/2007/11/ryan-lu...-championship/

"His Sirio CL7B-powered ST-RR was very fast" says it all..

any other reviews of the CL7B? esp the STI version?

i've never run Sirio b4, deciding to get either the CL7B STI or OS Speed AL.
comments anyone?
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