B&M 174 belt clearance problems
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B&M 174 belt clearance problems

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    Member Jmicus's Avatar
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    Default B&M 174 belt clearance problems

    I have a B&m 174 and a 502 502 crate engine. The motor has a v belt setup and the snout is just to short for the setup i have. What do i need to make this work. DO i need to switch to a serp setup for this or can i getaway with a different v belt crank pulley. Also do they have a pulley spacer up top for the snout pulley?

    Any help would be awesome.

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    Quote Originally Posted by Jmicus View Post
    I have a B&m 174 and a 502 502 crate engine. The motor has a v belt setup and the snout is just to short for the setup i have. What do i need to make this work. DO i need to switch to a serp setup for this or can i getaway with a different v belt crank pulley. Also do they have a pulley spacer up top for the snout pulley?

    Any help would be awesome.
    I think that blower is to small for a 502

    I ran one on a small block once

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    gn7
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    Quote Originally Posted by BigSteve View Post
    I think that blower is to small for a 502

    I ran one on a small block once
    That was mentioned in his very first thread.
    http://www.performanceboats.com/dyno...ld-advice.html


    In not sure I understand the whole "v belt" thing. What has v belts? The accessories, or the blower???
    The blower and manifold are designed for use with a 3 v belt crank pulley for accessories.



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    Quote Originally Posted by gn7 View Post
    That was mentioned in his very first thread.
    http://www.performanceboats.com/dyno...ld-advice.html


    In not sure I understand the whole "v belt" thing. What has v belts? The accessories, or the blower???
    The blower and manifold are designed for use with a 3 v belt crank pulley for accessories.

    The accessories are all on v belts. There are three separate belts for all the accessories. When the blower is mounted on the motor the lower pulley sticks out two inches farther then the pulley on the snout. The previous owner have it on a v belt accessory motor but apparently it was a different style. If i switched to a serp setup i would at least have room to work with.. I was seeing if any one had a similar issue and how it was solved.

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    gn7
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    Quote Originally Posted by Jmicus View Post
    The accessories are all on v belts. There are three separate belts for all the accessories. When the blower is mounted on the motor the lower pulley sticks out two inches farther then the pulley on the snout. The previous owner have it on a v belt accessory motor but apparently it was a different style. If i switched to a serp setup i would at least have room to work with.. I was seeing if any one had a similar issue and how it was solved.
    There are 2 different 3 groove pulleys for a BBC, a deep on for long water pumps, and a shallow one for short water pumps. You need on that is shallower from the short water pump design. You will have to re-space the stuff that is driven by the v belts, but that's easier and cheaper than a serpentine belt setup.

    I bet your lower pulley has a deeper dish than this one.
    Click image for larger version. 

Name:	BBC lower pulley.jpg 
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    Quote Originally Posted by gn7 View Post
    There are 2 different 3 groove pulleys for a BBC, a deep on for long water pumps, and a shallow one for short water pumps. You need on that is shallower from the short water pump design. You will have to re-space the stuff that is driven by the v belts, but that's easier and cheaper than a serpentine belt setup.

    I bet your lower pulley has a deeper dish than this one.
    Click image for larger version. 

Name:	BBC lower pulley.jpg 
Views:	49 
Size:	6.9 KB 
ID:	367361


    Thank you!!!! I was at a stand still with this issue haha. I will look into this. Now i just need to find one of those haha

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    Quote Originally Posted by Jmicus View Post
    Thank you!!!! I was at a stand still with this issue haha. I will look into this. Now i just need to find one of those haha
    Think long and hard about using a 174 BM blower on a 502

    I don't think one person here in the dyno section would

    I could make more power N/A with fewer problems

    just my 2 cents

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    gn7
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    That one was on E bay.
    LINK # groove BBC pulley

    Summit and Jegs sell billet alum ones too.

    LINK: billet pulley

    You can usually find one in a wrecking yard as well.



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    ill take a pic of what i have just to confirm

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    Quote Originally Posted by BigSteve View Post
    Think long and hard about using a 174 BM blower on a 502

    I don't think one person here in the dyno section would

    I could make more power N/A with fewer problems

    just my 2 cents
    x2

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    do you think the thickness of the harmonic balancer could be an issue as well,

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    Quote Originally Posted by BigSteve View Post
    Think long and hard about using a 174 BM blower on a 502

    I don't think one person here in the dyno section would

    I could make more power N/A with fewer problems

    just my 2 cents

    Im currently looking for a larger blower for the boat. Regardless of blower size i will still need to get this figured out unless i go with a centrifugal unit.

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    gn7
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    Quote Originally Posted by Jmicus View Post
    do you think the thickness of the harmonic balancer could be an issue as well,
    If the blower pulley and lower blower pulley line up, then the problem is not with the balancer. If you move the balancer mounting point, the lower pulley will not line up with the blowers pulley. DO YOU NEED TO MOVE THE LOWER BLOWER PULLEY????



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