EVO All Evo Model Discussion

I really lost myself this weekend

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Old Feb 23, 2018 | 06:13 AM
  #161  
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Originally Posted by Mattbastard
The only case gasket ever worth using: YAMABOND!!!!!

Recommended by 4 out of 5 dentist....
 
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Old Feb 23, 2018 | 09:11 AM
  #162  
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Technically, Yamabond 4. No need for the high-temp ****.

Here's the breakdown for the noobs:

https://www.shopyamaha.com/yamalube-...-motor-company
 
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Old Feb 23, 2018 | 12:55 PM
  #163  
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So I'm learning something. I can do a flow rate conversion since my heads were done at 10" water column if I want to know the rate at a different vacuum level. Prepare for math...:

(Sqrt(new vacuum level/known vacuum level))*known flow rate

Verbally that's the square root of the ratio of the new vacuum to the known vacuum level, and all that multiplied by the known flow rate.

So, my heads are 175 cfm at 10":

(Sqrt(28/10))*175 = 293 cfm, at .600" lift.
 

Last edited by Mattbastard; Feb 23, 2018 at 01:12 PM.
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Old Feb 23, 2018 | 04:31 PM
  #164  
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I have a headache.
 
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Old Feb 23, 2018 | 05:25 PM
  #165  
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LOL! I had to get that math in before beer:30 because I don't math after beer.
 
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Old Feb 23, 2018 | 08:32 PM
  #166  
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Originally Posted by Mattbastard
So I'm learning something. I can do a flow rate conversion since my heads were done at 10" water column if I want to know the rate at a different vacuum level. Prepare for math...:

(Sqrt(new vacuum level/known vacuum level))*known flow rate

Verbally that's the square root of the ratio of the new vacuum to the known vacuum level, and all that multiplied by the known flow rate.

So, my heads are 175 cfm at 10":

(Sqrt(28/10))*175 = 293 cfm, at .600" lift.
Those are very good numbers.. Who did your heads? DO you have any of the specs?
 
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Old Feb 24, 2018 | 10:16 AM
  #167  
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Hammer Performance in Idaho. They're a pie slice of the NRHS from the Sportster hop-up crowd back a few years ago. Long story short, half of NRHS wanted out and the other half didn't so they split. Hammer got the head guy, and now if you compare offerings Hammer gets the nod. I've used them before on an 88" Sportster build I did that pulled 100/100 all day on the CV40 carb and stock exhaust w/ SE mufflers.

Here's the build sheet:



They use a god knows how many axis CNC that's the size of a regular sized pick-up truck for all their head work.
 
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Old Feb 24, 2018 | 01:01 PM
  #168  
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Originally Posted by Mattbastard
LOL! I had to get that math in before beer:30 because I don't math after beer.
Hahaha
 
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Old Feb 24, 2018 | 05:43 PM
  #169  
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Broke in the new Harbor Freight bead breaker on some new Kenda Challenger tires. Dennis Kirk, $55 each. I've used these tires TONS of times in the past and they work great!

Warmin' em' up for a few years while I go buy some Harbor Freight tire irons:



Now invent some new swear words working them off, then with liberal WD-40 use spoon the new ones on and WA-LAA!!





I ghetto-balanced them by chucking the axle up in the vice and supported the other end with some pipe, then play steering wheel with the tire to find the heavy spot and put weights on the light end. I've had a ZX-11 up to 170mph before doing this and it was smooth as glass so I'm sold.

Now I'm gonna work on getting them cylinders and pistons installed. Oh ****, forgot to buy dowels. Oh well, break out the Harbor Freight bearing puller set (Did I mention Harbor Freight is absolutely the best for the shop rat supplies?)




And ****!!!!!!!!!!!!!!!!!!!!!!!!



I made an assumption that the rod ends would be no wider than the Sportster. Low and behold, not gonna fit. As you can see there's not much that needs to come off. The piston's stuck there like that. I'd bet 20 thou would be plenty. My only beef is I'd like it to be milled off, not with a Dremel or something like that. Something that would leave a nice flat surface.
 
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Old Feb 24, 2018 | 06:19 PM
  #170  
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What about the pin diameter? Are they going to match up as well?
 
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