Nauti by Nature Cigarette 38 Top Gun Refresh!!
#82
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What blowers are you running? what snouts? Can you post detail pics of your blower pulley, and serpentine pulleys, and setup? Also, the blower belt tensioner?
I was looking over mine last night, I need to revamp some things and needed some ideas. Who makes a nice tensioner setup for the 420 Megablower???
Thanks.
I was looking over mine last night, I need to revamp some things and needed some ideas. Who makes a nice tensioner setup for the 420 Megablower???
Thanks.
Snout - Original 420 Snout
Pulleys - 8mm Set Up
Belt Tension - The Blower Shop
Here is the Belt Tensioner It bolts up with the water pump holes in the block
![](http://i1123.photobucket.com/albums/l542/dawnmark2006/1364394215_zpsc93575dd.jpg)
My Bottom Pulley Set Up
![](http://i1123.photobucket.com/albums/l542/dawnmark2006/1364394213_zpsa9d4be83.jpg)
Top Pulley
![](http://i1123.photobucket.com/albums/l542/dawnmark2006/1364394222_zps425a3f90.jpg)
What it looked like in the boat!
![](http://i1123.photobucket.com/albums/l542/dawnmark2006/1364394200_zpsc4c4fc9b.jpg)
#83
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so you have 8 mm pulley right? when you say that, I guess it's the size of the blower pulley, not the crank, right?
what sizes pulley are available? you have 8 mm, is there 7 and 6 and 5 and so on?
Is there a rule of thumb like, a 8 mm pulley is 5 pounds of boost, and a 7 mm is a... 7 pounds of boost?
just throwing numbers as example but I don't know sh.t about blowers!
Thanks for teaching me!
what sizes pulley are available? you have 8 mm, is there 7 and 6 and 5 and so on?
Is there a rule of thumb like, a 8 mm pulley is 5 pounds of boost, and a 7 mm is a... 7 pounds of boost?
just throwing numbers as example but I don't know sh.t about blowers!
Thanks for teaching me!
#84
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8mm is the belt tooth design (round tooth). 1.2" pitch is square tooth. Below is a link to a site with raio chart.
http://goodvibesracing.com/Ratio_Charts.htm
http://goodvibesracing.com/Ratio_Charts.htm
#85
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so you have 8 mm pulley right? when you say that, I guess it's the size of the blower pulley, not the crank, right?
what sizes pulley are available? you have 8 mm, is there 7 and 6 and 5 and so on?
Is there a rule of thumb like, a 8 mm pulley is 5 pounds of boost, and a 7 mm is a... 7 pounds of boost?
just throwing numbers as example but I don't know sh.t about blowers!
Thanks for teaching me!
what sizes pulley are available? you have 8 mm, is there 7 and 6 and 5 and so on?
Is there a rule of thumb like, a 8 mm pulley is 5 pounds of boost, and a 7 mm is a... 7 pounds of boost?
just throwing numbers as example but I don't know sh.t about blowers!
Thanks for teaching me!
The 8mm Pulley just refers to the cog pulley set up. You either have a 8mm style or an rib style. The Rib is your serpentine belt (like a car) you have have 8 ribs or 16.
The 8mm set up (Cog style) has zero slip... where a serpentine will still slip a little... However the low boost settings on boat engines... either one is perfectly fine.
You get the boost from the size of the top & bottom pulley... either over driven or under driven. My top pulley is a 46 tooth, my bottom pulley is a 54 tooth
The math to figure it out is
Bottom teeth / Top Teeth = Blower Ratio
54 / 46 = 1.17 17% Over Drive
This set up made 6lbs of boost with my old cam.. I have a custom cam now that is quite a bit smaller.... I am guessing the boost will be at 8lbs. But you have to add the chillers back in, that is going to take some boost away. I won't know exactly what the boost is until we run it... Should be between 6-8lbs
#87
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MMB, Awesome, thanks,
That's exactley what I needed. Now, if I can just find the parts.....
Here's a stupid question:
With the cog style belt system, does it not require as much tension as a rib style setup? Looks like you just snug the tensioner up almost by hand. Unlike a rib style, which uses a threaded advance (or similar) to really put the "hurt" on the belt? I guess once it's relatively snug, it can't slip because of the cog drive....
That's exactley what I needed. Now, if I can just find the parts.....
Here's a stupid question:
With the cog style belt system, does it not require as much tension as a rib style setup? Looks like you just snug the tensioner up almost by hand. Unlike a rib style, which uses a threaded advance (or similar) to really put the "hurt" on the belt? I guess once it's relatively snug, it can't slip because of the cog drive....
Last edited by frickstyle; 03-27-2013 at 05:17 PM.
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MMB, Awesome, thanks,
That's exactley what I needed. Now, if I can just find the parts.....
Here's a stupid question:
With the cog style belt system, does it not require as much tension as a rib style setup? Looks like you just snug the tensioner up almost by hand. Unlike a rib style, which uses a threaded advance (or similar) to really put the "hurt" on the belt? I guess once it's relatively snug, it can't slip because of the cog drive....
That's exactley what I needed. Now, if I can just find the parts.....
Here's a stupid question:
With the cog style belt system, does it not require as much tension as a rib style setup? Looks like you just snug the tensioner up almost by hand. Unlike a rib style, which uses a threaded advance (or similar) to really put the "hurt" on the belt? I guess once it's relatively snug, it can't slip because of the cog drive....
You run right at 1.5" of slack in the belt.. You can move it 3/4" side to side
If you call the blower shop, they have everything your going to need!
#89
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This is probably in one of our earlier posts, what compression ratio are you running at a 17% overdrive? Are you running 93 octane or higher (at 6-8 psi)?
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