Belt Drives
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Belt Drives

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    Senior Member Need4Speed77's Avatar
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    Default Belt Drives

    What is the difference in the 2 pc upper and 1 pc upper belt drive kits?

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    gn7
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    Quote Originally Posted by Need4Speed77 View Post
    What is the difference in the 2 pc upper and 1 pc upper belt drive kits?
    Who makes a 1 piece?



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    Quote Originally Posted by gn7 View Post
    Who makes a 1 piece?
    Jesel now makes a "solid" pulley design with different keys, in addition to the original style with the 4 nuts to adjust timing. Jesel Valvetrain - Belt Drive Systems

    With the "solid" 1 piece one, you have to remove the pulley and change keyways to change timing. With the original 2 piece style, you loosen 4 nuts and adjust the marks.
    Last edited by obnoxious001; 11-09-2012 at 09:02 PM.

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    gn7
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    Quote Originally Posted by obnoxious001 View Post
    Jesel now makes a "solid" pulley design with different keys, in addition to the original style with the 4 nuts to adjust timing. Jesel Valvetrain - Belt Drive Systems

    With the "solid" 1 piece one, you have to remove the pulley and change keyways to change timing. With the original 2 piece style, you loosen 4 nuts and adjust the marks.

    Thanks Barry, I remember that now. I remember looking at those when they first came out and think WHY????? I guess as a cost cutting feature they have their place.
    Kind of reminds me of the SBC idler gear drives that Erson used to make and now are made by a couple of different companies(in China). You had to use the same lame offset dowel bushing to change the timing.





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    Last edited by gn7; 11-09-2012 at 09:08 PM.

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    Quote Originally Posted by gn7 View Post

    Thanks Barry, I remember that now. I remember looking at those when they first came out and think WHY????? I guess as a cost cutting feature they have their place.
    Kind of reminds me of the SBC idler gear drives that Erson used to make and now are made by a couple of different companies(in China). You had to use the same lame offset dowel bushing to change the timing.
    I had seen ads, but what's funny is that if you go on Summit, they show a photo of the original 2 piece one for the "solid" part number. Jesel Solid Upper Pulley Belt Drive Systems KBD-38200 - SummitRacing.com

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    gn7
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    Quote Originally Posted by obnoxious001 View Post
    I had seen ads, but what's funny is that if you go on Summit, they show a photo of the original 2 piece one for the "solid" part number. Jesel Solid Upper Pulley Belt Drive Systems KBD-38200 - SummitRacing.com
    Yeah, you know the old disclaimer. "picture may be different than the actual part."

    so to answer the OP's original quaestion, do you see and understand the difference?





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    Thanks guys. That seems to be a no brainer.

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    Quote Originally Posted by Need4Speed77 View Post
    Thanks guys. That seems to be a no brainer.
    It all depends if you will have a need to change cam timing often, like perhaps on the dyno. If you do plan to be changing it around, don't forget to check valve to piston clearance since that will also change.

    If you just wanted the belt drive, and don't plan on changing cam timing, no reason the new "solid" one won't work>

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    Quote Originally Posted by obnoxious001 View Post
    It all depends if you will have a need to change cam timing often, like perhaps on the dyno. If you do plan to be changing it around, don't forget to check valve to piston clearance since that will also change.

    If you just wanted the belt drive, and don't plan on changing cam timing, no reason the new "solid" one won't work>
    Good point. The piston to valve clearance will change enough to be concerned? I've put one on a SBC without checking it and never had a problem. I have never put one on a BBC.

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    Quote Originally Posted by gn7 View Post
    Yeah, you know the old disclaimer. "picture may be different than the actual part."

    so to answer the OP's original quaestion, do you see and understand the difference?

    If you were paying attention you'd have seen that's what we used on Ed Billet's 588.

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    Quote Originally Posted by Need4Speed77 View Post
    Good point. The piston to valve clearance will change enough to be concerned? I've put one on a SBC without checking it and never had a problem. I have never put one on a BBC.
    I personally would not leave it to chance if there is much lift to the cam. Won't take that much longer to check with the adjustable belt drive. Got no idea what you are building, but I would guess it's nothing cheap if you are putting a Jesel drive on it.

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    Quote Originally Posted by obnoxious001 View Post
    I personally would not leave it to chance if there is much lift to the cam. Won't take that much longer to check with the adjustable belt drive. Got no idea what you are building, but I would guess it's nothing cheap if you are putting a Jesel drive on it.
    Well looks like I'll be checking it. .780 lift coming out and .800 going back in.

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    gn7
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    Quote Originally Posted by Need4Speed77 View Post
    Well looks like I'll be checking it. .780 lift coming out and .800 going back in.
    Its not just checking it at the position think you'll be running it, but any position you think you might. Does it change? You bet it does. If I advance the cam in my GN engine 2*, the intake is in danger zone.

    Advancing the cam moves the intakes closer, retarding moves the exhaust closer



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    Thanks for the help guys!

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