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Those running the Aster Bracket, let me know your pulley/belt lengths

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Those running the Aster Bracket, let me know your pulley/belt lengths

Old 02-01-2016, 09:24 AM
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Anybody running a 4.0 pulley with the CBR 8.65 crank pulley? If so what belt length and what position is the idler. Thanks in advance.
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Old 02-05-2016, 08:29 AM
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Originally Posted by 95-1LE-Z28 View Post
Anybody running a 4.0 pulley with the CBR 8.65 crank pulley? If so what belt length and what position is the idler. Thanks in advance.
If you find out the info, please let me know. Thanks! Bob
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Old 02-05-2016, 10:57 AM
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Originally Posted by [email protected] View Post
If you find out the info, please let me know. Thanks! Bob
Certainly.
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Old 02-07-2016, 08:48 AM
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Originally Posted by 95-1LE-Z28 View Post
Anybody running a 4.0 pulley with the CBR 8.65 crank pulley? If so what belt length and what position is the idler. Thanks in advance.
That's a good question, because when I'm ready for some more power, that's going to be the route I go. I just need to get my fueling and intercooler sorted out first before I crank up the blower.
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Old 05-14-2016, 07:13 AM
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I'm just updating this with some new found knowledge. For a 7.65"/4.00" combo, with a Gates, green belt, 52.5" long, you need the idler in the position furthest from the blower. I have mine in the middle position, and I'm losing boost in the upper rpm range, and finally saw the dust on the bracket last night.

As the rpm's rise, and the tensioner takes up the slack, it will bottom out, and no longer be able to take up slack, so that is why the idler needs to be in the further position to allow the tensioner to take up the slack.

In a perfect world, we'd have belts that wouldn't stretch, but till then, we have the Aster bracket setup to take up the slack when they do.
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Old 05-21-2016, 06:44 AM
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Originally Posted by The Alchemist View Post
I'm just updating this with some new found knowledge. For a 7.65"/4.00" combo, with a Gates, green belt, 52.5" long, you need the idler in the position furthest from the blower. I have mine in the middle position, and I'm losing boost in the upper rpm range, and finally saw the dust on the bracket last night.

As the rpm's rise, and the tensioner takes up the slack, it will bottom out, and no longer be able to take up slack, so that is why the idler needs to be in the further position to allow the tensioner to take up the slack.

In a perfect world, we'd have belts that wouldn't stretch, but till then, we have the Aster bracket setup to take up the slack when they do.
Good info, thanks! Bob
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Old 05-31-2016, 03:16 PM
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Originally Posted by [email protected] View Post
If you find out the info, please let me know. Thanks! Bob
8.65 cank pulley/ 4.0 pulley - 53.7" long 8 rib belt
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Old 05-31-2016, 03:24 PM
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Originally Posted by 95-1LE-Z28 View Post
8.65 cank pulley/ 4.0 pulley - 53.7" long 8 rib belt
Thanks, I appreciate it! Bob
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Old 12-01-2017, 01:20 PM
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Originally Posted by 95-1LE-Z28 View Post
4.13 pulley with 8.65 crank pulley - Gates K080537HD.
I think this belt might have been a bit too tight. I switched to K080545HD with the Idler in the middle hole and that seems to be perfect.
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Old 12-01-2017, 01:36 PM
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Originally Posted by 95-1LE-Z28 View Post
I think this belt might have been a bit too tight. I switched to K080545HD with the Idler in the middle hole and that seems to be perfect.
Thanks for the info, I'll get it added. Bob
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Old 12-05-2017, 12:20 PM
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After blowing through another set of little pulley bearings in three months I decided to try an experiment.

I bypassed the little pulley by routing a shorter belt underneath it, basically doing SDCE style belt routing. Recently made 580 whp on a mustang dyno without meth with this new setup which puts me right at my no meth 650 whp dynojet dyno with the Aster 7.65/3.4 setup years ago. So it doesn't seem to be giving up much not running the little pulley.

Current setup:
52.5" Belt K080525HD. 8.65 CBR, 3.85" Blower, Idler on Far position, little pulley bypassed.

Previous setup:
53.7" Belt K080537HD. 8.65 CBR, 3.85" Blower, Idler on Middle position, with little pulley.

Max RPMS of the pulleys with 7.65 and 8.65 crank pulleys:

Large Idler Pulley 2.75" Diameter, C=8.64"
With 7.65" Crank Pulley: 24.03/8.64=2.78 @ 6500 engine RPM = 18,070 RPM
With 8.65" Crank Pulley: 27.17/8.64=3.15 @ 6500 engine RPM = 20,475 RPM

Small Idler Pulley 1.75" Diameter, C=5.50"
With 7.65" Crank Pulley: 24.03/5.50=4.37 @ 6500 engine RPM = 28,405 RPM
With 8.65" Crank Pulley: 27.17/5.50=4.94 @ 6500 engine RPM = 32,110 RPM
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Old 12-07-2017, 08:55 AM
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Originally Posted by white01ss View Post
After blowing through another set of little pulley bearings in three months I decided to try an experiment.

I bypassed the little pulley by routing a shorter belt underneath it, basically doing SDCE style belt routing. Recently made 580 whp on a mustang dyno without meth with this new setup which puts me right at my no meth 650 whp dynojet dyno with the Aster 7.65/3.4 setup years ago. So it doesn't seem to be giving up much not running the little pulley.

Current setup:
52.5" Belt K080525HD. 8.65 CBR, 3.85" Blower, Idler on Far position, little pulley bypassed.

Previous setup:
53.7" Belt K080537HD. 8.65 CBR, 3.85" Blower, Idler on Middle position, with little pulley.

Max RPMS of the pulleys with 7.65 and 8.65 crank pulleys:

Large Idler Pulley 2.75" Diameter, C=8.64"
With 7.65" Crank Pulley: 24.03/8.64=2.78 @ 6500 engine RPM = 18,070 RPM
With 8.65" Crank Pulley: 27.17/8.64=3.15 @ 6500 engine RPM = 20,475 RPM

Small Idler Pulley 1.75" Diameter, C=5.50"
With 7.65" Crank Pulley: 24.03/5.50=4.37 @ 6500 engine RPM = 28,405 RPM
With 8.65" Crank Pulley: 27.17/5.50=4.94 @ 6500 engine RPM = 32,110 RPM

That is good info, thanks for posting it! Bob
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Old 12-07-2017, 12:15 PM
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Good info.

Is the 8.65" pulley still available?
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Old 12-07-2017, 12:17 PM
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Originally Posted by The Alchemist View Post
Good info.

Is the 8.65" pulley still available?
Yes it is, I even have one sitting on my desk right now.
http://shop.brutespeed.com/CBR-8RIB8...8RIB865PLY.htm
Thanks. Bob
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Old 12-09-2017, 06:48 AM
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Originally Posted by [email protected] View Post
Yes it is, I even have one sitting on my desk right now.
http://shop.brutespeed.com/CBR-8RIB8...8RIB865PLY.htm
Thanks. Bob
Good deal Bob.

I might pick it up this spring when I decide I need more power
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Old 04-27-2018, 03:26 PM
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Originally Posted by 95-1LE-Z28 View Post
I think this belt might have been a bit too tight. I switched to K080545HD with the Idler in the middle hole and that seems to be perfect.
Did this belt work out for you? Idler position?
Thanks
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Old 04-27-2018, 04:54 PM
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Originally Posted by Z QQH 6 View Post
Did this belt work out for you? Idler position?
Thanks
Yes. Idler was in the middle hole.
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