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O.S. SPEED Tuned 21XZ-R

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Old 06-23-2011, 03:40 AM
  #61  
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Now to the good bits...

The crank. Hardcoated, looks very aggressive and balanced.

Nothing too special about piston/rod but looks very solid and might handle some punishment
Attached Thumbnails O.S. SPEED Tuned 21XZ-R-8.jpg   O.S. SPEED Tuned 21XZ-R-9.jpg   O.S. SPEED Tuned 21XZ-R-10.jpg  
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Old 06-23-2011, 03:42 AM
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Sleeve, button and backplate...
Attached Thumbnails O.S. SPEED Tuned 21XZ-R-11.jpg   O.S. SPEED Tuned 21XZ-R-12.jpg   O.S. SPEED Tuned 21XZ-R-13.jpg   O.S. SPEED Tuned 21XZ-R-14.jpg  
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Old 06-23-2011, 03:42 AM
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Head looks very nice, drilled out and lightweight...
Attached Thumbnails O.S. SPEED Tuned 21XZ-R-15.jpg   O.S. SPEED Tuned 21XZ-R-16.jpg  
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Old 06-23-2011, 04:10 AM
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Originally Posted by Novarossi
Now to the internals. Again I am amazed with the fit and quality....

Steel bearings, but very nice carb. Comes with optional venturi...
Better put some silicone sealant at the carb neck, for sure some leakage there coz the o ring is too lose.
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Old 06-23-2011, 04:12 AM
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Originally Posted by beebone
Better put some silicone sealant at the carb neck, for sure some leakage there coz the o ring is too lose.
I use Lucky 7 Carb Sealant on all my carbs
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Old 06-23-2011, 05:30 AM
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Thanks Novarossi for posting pictures.
Engine looks very nice, quite simple, yet very nicely made.

Let us know of your first test impressions.
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Old 06-23-2011, 04:14 PM
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Originally Posted by John Doucakis
Thanks Novarossi for posting pictures.
Engine looks very nice, quite simple, yet very nicely made.

Let us know of your first test impressions.
John, he wont know what hit him when he unleashes that raw OS power, i just hope he doesn't put the car into the fence

good luck with it Novarossi or should we call you OS now? i am looking forward to our endless battles on the track and of the track
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Old 06-24-2011, 02:10 PM
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Did anyone check timings? I'm very curious...
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Old 06-25-2011, 09:59 AM
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Originally Posted by Flygio
Did anyone check timings? I'm very curious...
I shim the head 0.1mm more,start leaning the HSN 3 turns from full seat, 2-3 hrs to go.
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Old 06-25-2011, 10:01 AM
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I shim the head 0.1mm more,start leaning the HSN 3 turns from full seat, 2-3 hrs to go.
5:10" per tank now, running 100C
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Old 06-25-2011, 10:03 AM
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Default Con rod selection
Anyone knows the difference of
23755000 (Max VZ-B) and 23755020 (Speed VZ)?
Both engines are in same Bore and Stroke, can be interchanged?
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Old 06-25-2011, 03:02 PM
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Originally Posted by beebone
I shim the head 0.1mm more,start leaning the HSN 3 turns from full seat, 2-3 hrs to go.
beebone, I am curious to know why you shimmed the head 0.1mm more? Is this for break in only?
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Old 06-25-2011, 05:34 PM
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Originally Posted by Novarossi
beebone, I am curious to know why you shimmed the head 0.1mm more? Is this for break in only?
My normal pratice for the high speed track. it pretty safe to reduce denotation in high rpm.
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Old 06-26-2011, 02:37 AM
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Originally Posted by beebone
My normal pratice for the high speed track. it pretty safe to reduce denotation in high rpm.
I do the same beebone, i have noticed some loss of power when this is done, but for longevity it is good
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Old 06-26-2011, 06:25 AM
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Originally Posted by bigredspeed
I do the same beebone, i have noticed some loss of power when this is done, but for longevity it is good
Yes, the low end power has lost, so compensate by the gear ratio and longer manifold.
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