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Another, is this belt too tight?

Discussion in 'Engine/Tuning' started by JCDriller, May 29, 2020.

  1. JCDriller

    JCDriller Well-Known Member Established Member

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    Hey guys,

    I’m trying to get the right belt combo. This is a gates K080797RPM which is 79.62”. I ordered a K080817RPM which is 81.77”, because I want to install a metro oversized alternator pully, but I think even with the pully swap it’ll be to lose. There is an in between belt (K080810RPM 81.04”) I’m going to order, but is the car drivable with this belt or should I not drive it until I get a new belt? These things seem to take a couple weeks to ship and the weather is nice. Just don’t want to damage the crank snout or bearings.


    View attachment 1643256 3DF44CD2-B25E-40E8-ABF9-6D48867349EF.jpeg
     
    Last edited: May 30, 2020
  2. Bdubbs

    Bdubbs u even lift bro? Premium Member Established Member

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    Many have run them tighter than that. I have as well.



    Sent from my Moto E (4) Plus using Tapatalk
     
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  3. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    But aren't you supposed to run the RPM belts with a lot less tension?
     
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  4. c6zhombre

    c6zhombre E85 NutSwinger Established Member

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    Yes, that is correct. But it can't be so loose it doesn't even hold a hit of the throttle and falls short of target boost. It has to be tight enough.

    Looking at that pic......it looks like it's barely registering on that index mark. Probably gonna need 25% more tension. But as I always say.....err on the loose side originally, then tighten if need be. You start off the other direction.....too damn tight.....good chance she gonna snap!
     
  5. 01yellercobra

    01yellercobra AKA slo984now Established Member

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    I think one of us us looking at that upside down. Looking at my tensioner I see it as maxed out.
     
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  6. JCDriller

    JCDriller Well-Known Member Established Member

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    Yea that is just beyond max, it’s very difficult to get the belt on. I don’t in know why SVTP rotates every photo. I re-did it and now it’s easier to see.
     
  7. c6zhombre

    c6zhombre E85 NutSwinger Established Member

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    Oh snap, my apologies....I did look at that all wrong! Ya, that's not going to end well for that rpm belt
     
  8. BLOWN9646

    BLOWN9646 E85 COBRA Established Member

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  9. JCDriller

    JCDriller Well-Known Member Established Member

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    That's what I thought, Thanks guys, I'll keep it parked until the new belt comes in.
     
  10. blownfox

    blownfox Well-Known Member Established Member

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    Not sure when your belt will arrive but I have two different sizes laying around. They might be to small but can drop them off if you want to try them.
     
  11. JCDriller

    JCDriller Well-Known Member Established Member

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    Thanks brother, I caused this problem myself by swapping the more functional Whipple adjustable idler pulley for the more esthetic METCO one. It's just a two bolt swap, I'll just go back to the adjustable Whipple set up until I get the other belt in a week or two. I do appreciate it though.
     
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  12. Bdubbs

    Bdubbs u even lift bro? Premium Member Established Member

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    I'd ditch the metco and keep the whipple adjustable idler pulley on. One of the best supporting mods I've done.

    Sent from my Moto E (4) Plus using Tapatalk
     
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  13. JCDriller

    JCDriller Well-Known Member Established Member

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    I know, it’s totally esthetic, I’m hoping once I get the belt figured out it’ll be fine. If this next belt doesn’t fit, I’ll go back to the adjustable.
     

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