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Old 01-27-2010, 06:07 PM   #1831
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Lightbulb clutch: preload vs gap

I was rebuilding my clutch and was wondering: example...
Spring preload 0.8mm with 0.7mm gap vs preload 1mm with 0.5mm gap; what's the effects?
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Old 01-28-2010, 08:50 PM   #1832
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Originally Posted by NitroWD View Post
I was rebuilding my clutch and was wondering: example...
Spring preload 0.8mm with 0.7mm gap vs preload 1mm with 0.5mm gap; what's the effects?
Clutch gap is the amount that the clutch shoe moves before it contacts the clutch housing; this affects the WAY that the clutch engages more than WHEN it engages. Spring Preload affetcs when, the RPM range prior to engagement.
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Old 01-29-2010, 12:44 AM   #1833
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Clutch gap is the amount that the clutch shoe moves before it contacts the clutch housing; this affects the WAY that the clutch engages more than WHEN it engages. Spring Preload affetcs when, the RPM range prior to engagement.
ok i understand.
so which of my example will give me more 'punch' out of a corner?

1. Spring preload 0.8mm with 0.7mm gap or
2. preload 1mm with 0.5mm gap
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Last edited by NitroWD; 01-29-2010 at 01:56 AM.
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Old 01-29-2010, 02:17 AM   #1834
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Old 01-29-2010, 02:24 AM   #1835
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BUT,

If the spring you have is a softer type, the amount of pre tension you have to put on it to let it engage on the correct RPM might result in a clutch with slip, because the maximum distance the clutch shoe can move depends on the maximum distance the spring has left before it's fully compressed....
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Old 01-29-2010, 04:27 PM   #1836
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1. STD Spring w/0.7mm gap
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Old 01-29-2010, 07:11 PM   #1837
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the 09 720 and 733 comes with the 1.8 clutch spring in the kits.
i find that on a lower grip track , the 1.7 from the 08 or older 720 works best. the 1.8 spring is just too much for a lower grip track.
i use the 1.7 spring, 0.7 preload and a gap of 0.6. its a nice smooth engaging clutch that wont upst the rear of the car getting on throttle, and it is very consistant. for sure high grip use the 1.8 and you can afford to be agressive with the settings, but for anyone on a low grip track , try this clutch setting, it really works well.
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Old 01-29-2010, 10:11 PM   #1838
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What are the arms with H etched into the plastic in white?
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Old 01-29-2010, 10:20 PM   #1839
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What are the arms with H etched into the plastic in white?
New Harder Material construction parts.
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Old 01-29-2010, 10:27 PM   #1840
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New Harder Material construction parts.
Does this mean the other ones are weak?
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Old 01-30-2010, 12:17 AM   #1841
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Not weak just softer. The "H" arms are made from a stiffer plastic but they also change the handling of the car cause of their stiffness.
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Old 01-30-2010, 01:47 AM   #1842
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What are the arms with H etched into the plastic in white?
804206 - 804209
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Old 01-30-2010, 02:18 PM   #1843
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Quote:
Originally Posted by Pattojnr View Post
the 09 720 and 733 comes with the 1.8 clutch spring in the kits.
i find that on a lower grip track , the 1.7 from the 08 or older 720 works best. the 1.8 spring is just too much for a lower grip track.
i use the 1.7 spring, 0.7 preload and a gap of 0.6. its a nice smooth engaging clutch that wont upst the rear of the car getting on throttle, and it is very consistant. for sure high grip use the 1.8 and you can afford to be agressive with the settings, but for anyone on a low grip track , try this clutch setting, it really works well.
If in lower traction track ,
first choice 32 or 35 shore tire ,
if same lower grip use Parragon Ground Effect
Spring can softer & 0.8mm / gap 0.4-0.6 only !
will had smooth & turn 0-80%+ had punch & response ,
but need keep rebuild your engine !
change your engine bearing !

What Engine ?
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Old 01-30-2010, 09:19 PM   #1844
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Originally Posted by RC MARKET View Post
If in lower traction track ,
first choice 32 or 35 shore tire ,
if same lower grip use Parragon Ground Effect
Spring can softer & 0.8mm / gap 0.4-0.6 only !
will had smooth & turn 0-80%+ had punch & response ,
but need keep rebuild your engine !
change your engine bearing !

What Engine ?
softer tire = more tyre wear. cant do that as track is too hard on 40's never mind 32 ! not allowed to use tire additives.
clutch spring is the thing to change. engine bearings ? hahaha doesnt effect car grip.
next time, try the clutch spring.
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Last edited by Pattojnr; 01-30-2010 at 10:05 PM.
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Old 01-30-2010, 09:43 PM   #1845
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saw these new goodies from serpent for my 733. Nice!

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