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View Full Version : reichard racing pulley size



Sick 660r
07-28-2008, 03:05 PM
Im about to buy a pulley from richard racing and im wondering what size I should go with. The stock pulley is 3.25 and they have a ton of options smaller than that. I want to get a little more boost but I dont have any type of cooling. Ill be going with a larger crank pulley in the future, so what do you guys thing would be a good combo?

Rtspeeddemon
07-28-2008, 04:53 PM
If your going to a larger crank pulley you cannot change the SC pulley much OR you will be over revving the Supercharger. I am going with a 3.0 Reichard Racing pulley will be dynoing within the week. I already have the larger crank pulley and expect to see 17-18lbs possible. Was 15-16lbs with the 3.25 stock SC pulley. Not to mention terrified of cracking another block.

Forgot to add you really need a meth/injection kit to handle the detonation issue up in those boost ranges.

Sick 660r
07-28-2008, 05:29 PM
so I should be ok with a 3.0 for now and even when I get a larger crank pulley in the future? I think ill order a meth injection kit. Snow performance right?

Sick 660r
07-28-2008, 05:30 PM
wont a larger crank pulley over spin the sc just like a smaller sc pulley, or am I missing something?

bad360rt
07-28-2008, 05:39 PM
wont a larger crank pulley over spin the sc just like a smaller sc pulley, or am I missing something?

It's the combination of both the larger crank and smaller blower pulleys that can overspin the blower. Need to figure out what kind of rpm the blower is going to be seeing with the pulley combo you're looking at and the engine rpm you're going to be running.

Snow Performance makes a good kit, the SMC kit is good also.

Sick 660r
07-28-2008, 05:57 PM
Im thinking around 6,500 maybe 7k rpms when the whole thing is done. Would a 3.0 and the larger crank pulley (8" I believe) be ok? Is there a website that could figure this out? What rpm's would be overspinnig for the sc?

Lederip
07-28-2008, 07:20 PM
Im thinking around 6,500 maybe 7k rpms when the whole thing is done. Would a 3.0 and the larger crank pulley (8" I believe) be ok? Is there a website that could figure this out? What rpm's would be overspinnig for the sc?

You need to know the superchargers drive ratio and max rpms of the Paxton supercharger. I'm sure someone here has the numbers.

You can look here >>>> http://www.vortechsuperchargers.com/support.php?support_section=Impeller%20Speed%20Cal culator for an example of a Vortech impeller speed.

Rtspeeddemon
07-28-2008, 07:36 PM
Im thinking around 6,500 maybe 7k rpms when the whole thing is done. Would a 3.0 and the larger crank pulley (8" I believe) be ok? Is there a website that could figure this out? What rpm's would be overspinnig for the sc?

Not sure of the numbers but at that RPM level i'm positive you are over driving the supercharger with both pulleys changed. I plan on keeping revs to a max of about 6,300 rpms.

Rtspeeddemon
07-28-2008, 07:56 PM
I found this info.

NOVI 2000 SPECIFICATIONS

Max. Speed: 55000 RPM (In other words do NOT spin the Novi 2000 beyond this RPM!) Boost: 27 psi Air Flow: 1400 cfm Internal ratio: 3.54 Lets see how this applies to my setup. Since I want to limit the Novi 2000 to 55000 rpm, I can only rev my engine to 5826 rpm. If I multiply the internal ratio of the Novi by the ratio of my crank pulley/supercharger pulley I can determine
the over all ratio. So my crank pulley is 8″ in diameter and my supercharger pulley is 3″ in diameter. I can divide the 8 by 3 and I get 2.666. So my ratio is 2.666:1. Multiply the 2.666 x 3.54 = 9.4376. The overall ratio is 9.44:1. Now I divide 55000 by 9.44 and I get 5826

FOR MY SET-UP.

With my 8.5" crank pulley and a 3.0 SC pulley my ratio is 2.833:1
Multiply the 2.833 x 3.54 = 9.4376. The overall ratio is 10.03:1.
Now I divide 55000 by 10.03 and I get 5483.

Oh oh guess i am going to overdrive the SC. Maybe will hold engine RPM to 6,000 max that should keep blower below 60,000 rpms.

Sick 660r
07-28-2008, 11:52 PM
so if I go with a 3.2 pulley and keep the stock crank then I could go to 6215rpms. rtspeeddemon are you worried about overspinning by 5000?

dakotapimpc
07-29-2008, 11:35 AM
i failed math!!! it gives me a headache :notworthy:

Rtspeeddemon
07-29-2008, 11:58 AM
so if I go with a 3.2 pulley and keep the stock crank then I could go to 6215rpms. rtspeeddemon are you worried about overspinning by 5000?

You know what I say oh well. LOL There has to be some safety measure built into the specs. I mean if you spin 55,001 is it going to blow up I doubt it. I don't race it a lot so I'll take my chances. I don't know of anyone that has changed the crank pulley that wouldn't have over revved it to some point.

I mean just changing to the 8.5" crank pulley means you cannot exceed 5950 rpms. I know Dave D. was revving far higher than that me thinks?

Aves
07-31-2008, 07:39 PM
Can you give me the website addy for the pulley? AQlso anyone know if he makes them in 7 rib?

Rtspeeddemon
07-31-2008, 10:30 PM
I'm sure they make what you are after.

http://www.reichardracing.com/pulleys.php

bad360rt
07-31-2008, 10:44 PM
I mean just changing to the 8.5" crank pulley means you cannot exceed 5950 rpms. I know Dave D. was revving far higher than that me thinks?

I was crossing the line at around 5900, shifting at 5600. But if you're not racing it every weekend, you'll probably be ok going a lil over.

Sick 660r
08-01-2008, 01:17 AM
They make the common rib pulley, but im not exactly sure what they are. Maybe they can custom make one for you. I decided to go witht the 3.2 that way I can get the larger crank and still rev it up there in the future. The pulley came in today, heres some pics.
http://i226.photobucket.com/albums/dd274/jmonar5695/IMG_4990.jpg
http://i226.photobucket.com/albums/dd274/jmonar5695/IMG_4991.jpg

Rtspeeddemon
08-01-2008, 01:40 AM
They make the common rib pulley, but im not exactly sure what they are. Maybe they can custom make one for you. I decided to go witht the 3.2 that way I can get the larger crank and still rev it up there in the future. The pulley came in today, heres some pics.
http://i226.photobucket.com/albums/dd274/jmonar5695/IMG_4990.jpg
http://i226.photobucket.com/albums/dd274/jmonar5695/IMG_4991.jpg

Ya we are going with the 3.0 as we just happened to have a Reichard Racing pulley already here.

Sick 660r
08-02-2008, 01:10 AM
Ya we are going with the 3.0 as we just happened to have a Reichard Racing pulley already here.

How bads the belt dust?

Sick 660r
04-28-2011, 08:26 PM
back from the dead!

I need to drop my boost to around 8psi. I dont want to put a restrictor in the sc intake because all that does is heat the air so im going with the largest pulley I can find. Reichard racing sells a 3.75. Can anyone help figure out where this will put me boost wise? I was seeing 15psi at 6k with the 3.2. This time I will only be shifting around 5500. I have done some math going from KJ's earlier post and the 3.75 seems to drop the numbers by only 15% which does not seem like enough to me.

Five9Dak
04-29-2011, 11:19 AM
I don't do dynamic compressors, but I'll give you a free bump. I curious to learn any sort of methodology for this.