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GT
PostPosted: Thu Oct 26, 2006 9:52 pm 
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1098cc
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For twin HS2's on a 1275, should I use red or blue springs?
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Anto
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PostPosted: Thu Oct 26, 2006 9:56 pm 
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Depends on if your running standard air box or sports filters - in which case I'd vote red.
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drmini in aust
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PostPosted: Thu Oct 26, 2006 9:58 pm 
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Pretty sure the reds are stronger.
It depends on state of tune which you want.
:wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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GT
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PostPosted: Thu Oct 26, 2006 10:15 pm 
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1098cc
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standard GT (Cooper S) air box

red are stronger (4.5 oz). So that will make piston rise slower yea?
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drmini in aust
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PostPosted: Fri Oct 27, 2006 5:38 am 
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Well.. stronger springs will make it rise less, but the rate of rise is a function of the dashpot's oil viscosity.

Vizard recommends red springs in all cases for twin HS2 on a 1275S, modded or not. I reckon with blues they would be wide open too soon, then you have lost mixture control. :wink:

For a well modded 1275, twin HS2s are too small. :x

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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GT
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PostPosted: Fri Oct 27, 2006 8:39 am 
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thanks Kev.
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