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Big Block Talk! Everything about swapping a big block engine into your cart! |
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01-05-2015, 10:49 AM | #1 |
Gone Wild
Join Date: Jan 2014
Location: South Jersey
Posts: 623
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Belt ride all the way to the top?
Installed my briggs 16hp yesterday and I need to adjust it a little. Seems that at idle it still turns the belt just a little, should it? Also the belt doesnt ride all the way up the primary clutch. Im using a comet 780. Seems like it pulls the belt all the way down the secondary though. Will it still reach max mph not riding up the primary all the way?
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01-05-2015, 11:05 AM | #2 |
Gone Wild
Join Date: Sep 2012
Location: Missouri
Posts: 2,755
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Re: Belt ride all the way to the top?
When the cart isn't running squeeze the top and bottom of the belt toward each other between the two clutches. See how much distance between the two.
Your belt may be too tight and this would effect your belts ability to run to the top of the clutch. |
01-05-2015, 11:11 AM | #3 |
Gone Wild
Join Date: Jan 2014
Location: South Jersey
Posts: 623
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Re: Belt ride all the way to the top?
What distance should I have when squeezing it? 1.5"?
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01-05-2015, 11:12 AM | #4 |
Gone Wild
Join Date: Jan 2014
Location: South Jersey
Posts: 623
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Re: Belt ride all the way to the top?
And is the distance in between or from the top and bottom of the belt?
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01-05-2015, 11:57 AM | #5 |
Gone Wild
Join Date: Sep 2012
Location: Missouri
Posts: 2,755
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Re: Belt ride all the way to the top?
I actually went looking and found this post on another site. I think the same would go for a cart as a sled.
Slonomo suggests 1" to 2" of belt deflection (Tension) Here is part of the post I found. Belt Deflection (Tension) Belt deflection is very critical for proper clutch performance. If your deflection is too tight, the belt will burn on the clutch hub and you will lose top end. If the belt is too loose, it will allow the primary clutch to upshift faster then the secondary clutch causing a low end bog and poor performance. To check your belt deflection, You will need a straight edge and a tape measure. Normally you want your belt to stick out of the secondary clutch 1/16" - 1/8" if possible. Lay a straight edge on the belt and measure the distance between the straight edge and the belt between the two clutches. Lightly press down on the belt to remove any slack. Most machines use a spec of 1 1/8" to 1 1/4" of belt deflection. If you measure less than 1 1/8", your belt is too tight. If you measure more than 1 1/4" your belt is too loose. This procedure should be shown in your owners or service manual. Look at your manuals to see how to adjust belt deflection. Anytime you change your belt, your deflection can change. Remember, when you put on a new belt, it will stretch after awhile and the deflection will need to be reset. Adjusting belt fit Most clutch systems allow adjustment for belt fit. This is usually accomplished by adjusting the secondary pulley halves spacing -- either with shims or mechanical adjustment mechanisms. Center distance adjustment can correct some fit problems but should only be done as a last resort. This can lead to misalignment between the primary and secondary pulleys, drastically reducing belt life. Additionally, center distance adjustments should only be made within the tolerances specified by the sled manufacturer. Always adjust for the highest ride possible in the secondary pulley to get the best low gear possible, but avoid tightening so much that belt has difficulty de-clutching. This also can cause excessive wear on the bottom of the belt. |
01-05-2015, 01:01 PM | #6 |
Gone Wild
Join Date: Jan 2014
Location: South Jersey
Posts: 623
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Re: Belt ride all the way to the top?
Ok with the straight edge across the top of the belt and me pushing the top of the belt down I got 1 5/8". With me squeezing the belt together I get just under 2" between the belt.
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01-05-2015, 02:48 PM | #7 | |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Belt ride all the way to the top?
Quote:
I set mine up to about 1-2" of deflection on the top pushing down. It should be the same either way you do it. Take your thumb and push down on the top of the belt, to a point that you can't push it anymore with just that one thumb. Measure the difference. It's variable because temperature will effect how long the belt is. I've measured it on very cold days and it's around 1". And warm days about 2". And after I drive it it's also greater. Also a HD belt will move less than a standard belt. And belts stretch, so when you put some hours on it, it will be longer and have more movement. How it operates is more important than that actual measurement. I don't squeeze my belt from both sides, because this can sometimes open the secondary sheaves and the belt will drop lower into the clutch, which will give you a false reading and it will seem too much. I use the other method, pushing the belt down from the top. You also need to be careful how hard you push down, it will move the clutch sheaves that way too. So there's a fine line there. I have a brand new secondary clutch, brand new primary clutch, and brand new belt. My belt rides about 1/8-1/4" below the outer rim of the secondary clutch surface. It's fully compressed together. It's the same with every engine I have used also. It never comes all the way to the top even with the outer rim, just a bit below. Low gear is just perfect. It also shifts all the way down into high gear with the tires off the ground. Very smooth. Check yours and see if it's smooth and you get full engagement. Are you still having engagement or shifting issues? Can you post pics and a video? |
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01-05-2015, 05:21 PM | #8 |
Gone Wild
Join Date: Jan 2014
Location: South Jersey
Posts: 623
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Re: Belt ride all the way to the top?
Its os a little off alighned. It needs to be movwd over just a hair to be perfect
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