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Old 01-18-2004, 12:45 PM   #1
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Another Serpent centax question

Are there any major differences in the Serpent centax II and the earlier generation serpent centax clutches. I need to get a baseline set up for a serpent impact's centax and I can only find a diagram of the centax II. I am not as familiar with these clutches as I am with the Piccco Syncros.

Thanks
Keith
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Old 01-18-2004, 06:34 PM   #2
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Default Re: Another Serpent centax question

The earlier Centax I clutches uses different thrust bearings (4 x 9 x 4) and uses one flanged bearing (5 x 8 x 2.5) and one normal bearing (5 x 10 x 4). The Centax II uses two normal bearings (5 x 13 x 4 and 5 x 10 x 4) and a 5 x 10 x 4 thrust bearing.

The clutch spring is also softer on the Centax I (6587) while the Centax II comes with a harder 1.8 mm spring (909518). You can use the harder spring to tune your Centax I clutch.

The other difference is in the way they flyweights are mounted. The Centax I has a retainer spring which holds the 3 flyweights in place (6588 or the 6588C).

The Centax II does not have this spring and the flyweights are of different material (909515). Many who are still using the Centax I will uprade to these flyweights as they provide better punch and performance. You can also make your own flyweights. If you have a spare clutch shoe that you do not use, you can cut out the clutch shoe and use they as flyweights.

All in all, if I was still having the Centax I, I would upgrade the flyweights and use a harder 1.8 mm clutch spring. That will make it on par with the Centax II.

Depending on your track, you might want to stick to the normal 6587N yellow clutch shoes or the more grippy and softer 6587XP black shoes.

Last but not least, if you really want to use a Centax II clutch on your Impact, you need to change to the new lightened LC 2 speed gearbox (as well as 2 speed main layshaft) as the spurs will not align correctly with the pinions on the Centax II clutchbell (not to be confused with gear meshing). The pinions on the Centax I and II are the same. It's just that the spacing between the 1st and 2nd pinion are different on the clutch bell. It is narrower on the Centax II clutch bell and hence the 1st and 2nd gear spurs on the new LC 2 speed gearbox are narrower too.
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Old 01-19-2004, 09:02 AM   #3
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Thanks, Thats what I need.

now I can get on my inertia drift
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Old 01-31-2004, 09:50 AM   #4
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Another quick question-

Can I use the Centax 1 clutch bell on the centax II clutch assembly so I can use the same old 2-speed tranny? And are the impulse spur gears compatable with the impact? I need a new 1st gear 48t.

Thanks in adv.
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Old 01-31-2004, 09:52 PM   #5
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Nope, the Centax II bell is different than the Centax 1. and 2. the impulse/impulse pro came with a standard clutch in the kit. this standard clutch again had unique spacing between the pinion gears, and to compenate for this, the impulse/pro came with a 50t 1:st spur gear with a different offset than, say the 49t 1:st spur from an impact. The gearbox itself is identical between the 2 platforms. If you ever upgraded your impulse to use a centax clutch, you would have had to change out the spur gears for impact ones to get the spacing right again....
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Old 02-01-2004, 12:57 AM   #6
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Quote:
Originally posted by Turbo9000
Can I use the Centax 1 clutch bell on the centax II clutch assembly so I can use the same old 2-speed tranny?
Well, you actually can BUT you need to change a few small bearings.

The Centax II comes with the following;
5x10x4 bearing
5x13x4 bearing
aluminum bearing spacer (909514)
5x10x4 thrust bearing

To use the Centax I clutchbell on the Centax II clutch, you need to use these additional bearings;

5x8x2.5 flanged bearing
4x9x4 thrust bearing

You can look here for the parts list and the instruction diagram to see how these bearings are mounted. You need the 5x10x4 bearing which already came with the Centax II. The 1315 part number wrongly puts the bearing size as 5x10x3. It should be 5x10x4.

When shimming the Centax clutch, you need to shim it behind the flywheel and not like the Centax II which you can do in the front. A little cumbersome if you ask me.

Quote:
Originally posted by Turbo9000
And are the impulse spur gears compatable with the impact? I need a new 1st gear 48t.
The 48T (9648) is in fact an Impact / Centax spur gear. The one that comes with the Impulse 50T spur gear is meant for the normal clutch shoe and clutchbell that comes stock. It will not align correctly with the Centax pinions but if I remember correctly, it will mesh correctly.
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Old 02-01-2004, 09:48 AM   #7
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Guys, this is what I did... can you tell me if it works?-

I installed the centaxII clutch on my impact and to line up perfectly with the existing 2 speed. What I did was screw the 1st gear clutch gear on backwards. Initially the gear had a slight backspacing and overlaps part of the clutchbell, making the gears sit very close togather as metioned above. BUT what I did is turn the 1st gear around so there would be no back spacing and the gear screws all the way on backwards. I have yet to run the car with this set-up so im not entirely sure it will work...It looks like it definately should.
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Old 02-02-2004, 12:25 PM   #8
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If it looks alright, it will probably work just fine. Just make sure the 1:st and 2:nd gears line up with the spurgears. Mesh should not be a problem. Good luck.
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Old 02-02-2004, 06:39 PM   #9
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I ran the clutch today with no problems at all. Im using the orange pad with very little endplay (.02mm) and it still takes off like a rocket...I love it!!!
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Old 11-05-2016, 11:51 PM   #10
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Trying to bring this thread to life, hope someone can answer this.

I have a Centax 1 set up on my converted impulse to impact/835
and bent my Clutch bell ( don't ask me how LOL ) I can't find a replacement Centax 1 CB.

Can I use the Centax 2 or 3 Clutch bell with my set up.

and yes, I have the old 2 speed #801410

any suggestions or comments is appreciated!
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