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  what is the 3800 s/c's crank pulley diameter?

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what is the 3800 s/c's crank pulley diameter? by merlot566jka
Started on: 05-05-2008 10:46 PM
Replies: 10
Last post by: merlot566jka on 05-07-2008 02:55 AM
merlot566jka
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Report this Post05-05-2008 10:46 PM Click Here to See the Profile for merlot566jkaClick Here to Email merlot566jkaSend a Private Message to merlot566jkaDirect Link to This Post
just wondering, what is the size of the crank pulley? as i understand there are seperate belts for the supercharger and for the engine accesories. whats the size of the pulley on the harmonic balancer/vibration dampner that turns the supercharger?

this would be important to anyone trying to use the m90 supercharger on another type of engine. this would prevent the user from having to switch supercharger pullies to come up with the stock amount of boost that the m90 produces on the 3800.

thanks folks!

[This message has been edited by merlot566jka (edited 05-06-2008).]

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merlot566jka
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Report this Post05-06-2008 01:17 AM Click Here to See the Profile for merlot566jkaClick Here to Email merlot566jkaSend a Private Message to merlot566jkaDirect Link to This Post
wait think i found it....7''

right?? anyone?
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darkhorizon
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Report this Post05-06-2008 01:20 AM Click Here to See the Profile for darkhorizonSend a Private Message to darkhorizonDirect Link to This Post
ill double check it if I can remember when I am in the shop tomorrow.
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LFiero67
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Report this Post05-06-2008 02:31 AM Click Here to See the Profile for LFiero67Click Here to Email LFiero67Send a Private Message to LFiero67Direct Link to This Post
I believe it is 6.94" but 7" is close enough.

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merlot566jka
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Report this Post05-06-2008 03:32 AM Click Here to See the Profile for merlot566jkaClick Here to Email merlot566jkaSend a Private Message to merlot566jkaDirect Link to This Post


thank you
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Team Race-Tech
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Report this Post05-06-2008 07:40 AM Click Here to See the Profile for Team Race-TechSend a Private Message to Team Race-TechDirect Link to This Post
the stock size is 3.8" if you measure it across. So when you purchase one that is smaller, like a 3.4" it's not the circumference it's measured diagonal.

Joe

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merlot566jka
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Report this Post05-06-2008 09:39 AM Click Here to See the Profile for merlot566jkaClick Here to Email merlot566jkaSend a Private Message to merlot566jkaDirect Link to This Post
crank pulley, not supercharger pulley

[This message has been edited by merlot566jka (edited 05-06-2008).]

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Jncomutt
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Report this Post05-06-2008 03:11 PM Click Here to See the Profile for JncomuttClick Here to Email JncomuttSend a Private Message to JncomuttDirect Link to This Post
It depends where you are measuring from. I'm pretty sure GM calls for the outer face diameter to be about 176mm max and the larger area where the balance holes are drilled to be about 182mm max.

176 = approx 6.9
182 = approx 7.2

So pretty much expect the very widest part of the crank pulley to be around 7.25" with rust, etc.

EDIT, I see you want it for belts. I read that at first but got a bit carried away and forgot as i went to type this message. Just use 7" as the others said above.

[This message has been edited by Jncomutt (edited 05-06-2008).]

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merlot566jka
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Report this Post05-06-2008 05:03 PM Click Here to See the Profile for merlot566jkaClick Here to Email merlot566jkaSend a Private Message to merlot566jkaDirect Link to This Post
7'' for the crank and 3.8 for the supercharger thats a 2.06:1 ratio. i could use this to find what size of pulley it would take to get the 3500 crank pulley to turn the supercharger at the right speed.
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Jncomutt
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Report this Post05-07-2008 01:53 AM Click Here to See the Profile for JncomuttClick Here to Email JncomuttSend a Private Message to JncomuttDirect Link to This Post
You're going to want to overdrive the supercharger anyways..
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merlot566jka
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Report this Post05-07-2008 02:55 AM Click Here to See the Profile for merlot566jkaClick Here to Email merlot566jkaSend a Private Message to merlot566jkaDirect Link to This Post
eventually.

id like to start conservitive first..then work my way up. besides i dont see this thing being able to do more than 14psi anyways. not without a ton of heat.

at like 10000 (sc speed) rpm it adds about 240*f to the intake charge..... yikes!
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