FTR 1200's clamed 12.5 to 1 comp. - Victory Forums - Victory Motorcycle Forum
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post #1 of 6 (permalink) Old 05-02-2019, 08:34 PM Thread Starter
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Default FTR 1200's clamed 12.5 to 1 comp.

at the unveiling on the new Indian I picked up a ad flyer booklet, reading specs I see 12.5 to1 comp ratio!....is this for real.
or advertising hype...
what fuel are you expected to run with 12:5 ?
or is the ignition system so retarded it can cope?
The floor is open.......
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post #2 of 6 (permalink) Old 05-02-2019, 09:00 PM
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My VStrom is 11.5-1 and "by the book" they recommend 87 octane.

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post #3 of 6 (permalink) Old 05-02-2019, 09:38 PM Thread Starter
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Quote:
Originally Posted by vindex1963 View Post
My VStrom is 11.5-1 and "by the book" they recommend 87 octane.
must be new computerised ignition that retards the timing then hey?

Victory Vegas 2010
Lloydz 109"cube big bore
" " 495 cams
" " TorqueTubes
" " timing wheel @4 deg.
" " Primary plate
" " IAV
RPW Slash pipes
PCV
Progressive 465 rear shock
Kingpin USD Forks
18" XC front wheel
1 3/4" 'Burleigh Bars'
Stebel air horn
12.106 @110.90mph
114/123

Victory Cross Country 2010 (106)
Lloyds air filter
" " VM1 Cams
Home gutted exhaust
Maximus
Both tuned by [email protected] Dyno
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post #4 of 6 (permalink) Old 05-03-2019, 08:12 AM
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I would think they wouldn't recommend an octane level that hurts performance, one that causes the ignition to retard the timing.

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PC-V 118hp 116tq
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post #5 of 6 (permalink) Old 05-03-2019, 09:28 AM
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The shape of the cylinder head, piston and diameter have more to do with running higher compression than compression ratio alone. I've seen claimed 13 to 1 running regular.

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post #6 of 6 (permalink) Old 05-03-2019, 08:38 PM Thread Starter
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Quote:
Originally Posted by Blowndodge View Post
The shape of the cylinder head, piston and diameter have more to do with running higher compression than compression ratio alone. I've seen claimed 13 to 1 running regular.
ok well my heads obviously stuck in the past then,
advances in engine technology and spark management have enabled the use of higher compressions without the use of exotic fuels that wouldve been needed to run more than 11:1 in the past..
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Victory Vegas 2010
Lloydz 109"cube big bore
" " 495 cams
" " TorqueTubes
" " timing wheel @4 deg.
" " Primary plate
" " IAV
RPW Slash pipes
PCV
Progressive 465 rear shock
Kingpin USD Forks
18" XC front wheel
1 3/4" 'Burleigh Bars'
Stebel air horn
12.106 @110.90mph
114/123

Victory Cross Country 2010 (106)
Lloyds air filter
" " VM1 Cams
Home gutted exhaust
Maximus
Both tuned by [email protected] Dyno
110/116

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