more squeeze - Yamaha SCR950 Forum
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post #1 of 29 (permalink) Old 07-17-2019, 09:16 PM Thread Starter
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more squeeze

just got these bad boys..10.5:1
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post #2 of 29 (permalink) Old 07-17-2019, 11:01 PM
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just got these bad boys..10.5:1
Oh my! You think you will be able to run 91 octane safely? Any other mods like cams? Jevers
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post #3 of 29 (permalink) Old 07-18-2019, 12:16 AM
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Keep us posted!
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post #4 of 29 (permalink) Old 07-18-2019, 01:43 AM
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Go fast or go home.
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post #5 of 29 (permalink) Old 07-18-2019, 07:20 AM Thread Starter
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hi test

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Oh my! You think you will be able to run 91 octane safely? Any other mods like cams? Jevers
The only fuel my bike has ever seen is 100 octane racing fuel. I'm pretty sure premium would be fine with the bump in compression.
cannot find anyone making cams for that bike. they would have to be custom ground.
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post #6 of 29 (permalink) Old 07-20-2019, 12:55 AM
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Dang, let us know how it runs! Any plans to put the bike on the dyno?
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post #7 of 29 (permalink) Old 07-20-2019, 05:21 AM Thread Starter
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Yes, before and after.
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post #8 of 29 (permalink) Old 07-21-2019, 09:59 PM
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Yes, before and after.
Awesome, can't wait to see what the gains are. I would definitely consider that mod!
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post #9 of 29 (permalink) Old 07-22-2019, 10:18 AM
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So 10.5 SCR I'm sure is based on an all factory config, chamber volume, pin compression height, etc, but you really won't know what actual SCR is until you actually measure.


Point is, curious as to what SCR actually comes out to.


That will also be needed to correctly have a cam ground, and you can compensate for SCR some and control detonation that way.


Many street cars have that type of SCR and run on pump gas, just to say. But, they are liquid cooled.


Considering the head is aluminum, running 91 shouldn't be difficult at all, but will still take some planning.


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post #10 of 29 (permalink) Old 07-23-2019, 09:23 AM
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Originally Posted by HWYSTR455 View Post
So 10.5 SCR I'm sure is based on an all factory config, chamber volume, pin compression height, etc, but you really won't know what actual SCR is until you actually measure.


Point is, curious as to what SCR actually comes out to.


That will also be needed to correctly have a cam ground, and you can compensate for SCR some and control detonation that way.


Many street cars have that type of SCR and run on pump gas, just to say. But, they are liquid cooled.


Considering the head is aluminum, running 91 shouldn't be difficult at all, but will still take some planning.


.
Being a bit of a novice when it comes to engine building, I have to ask.
What is does " SCR " refer to? Thanks. Jevers
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