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Thanks Guys! I try to keep as clean as possible!
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Originally Posted by frickstyle
(Post 3893487)
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. 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/...psc93575dd.jpg My Bottom Pulley Set Up http://i1123.photobucket.com/albums/...psa9d4be83.jpg Top Pulley http://i1123.photobucket.com/albums/...ps425a3f90.jpg What it looked like in the boat! http://i1123.photobucket.com/albums/...psc4c4fc9b.jpg |
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! |
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 |
Originally Posted by jeff32
(Post 3893587)
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! 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 |
Great Thread. Thank you for sharing Well Done !!!!!!!!!! Bill
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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.... |
Originally Posted by frickstyle
(Post 3893824)
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.... 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! |
Originally Posted by mmb
(Post 3894059)
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! |
Originally Posted by frickstyle
(Post 3894162)
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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