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  #21  
Old 06-25-2020, 07:33 AM
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So be it!!! I'm still waiting on a delivery truck myself...
Thatís the hard part.

Well, that and paying for it all, lol.
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  #22  
Old 06-29-2020, 07:09 PM
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The brown truck came today and brought me a hog, a hog of a camshaft
Custom ground billet tool steel unit with ramp angles so aggressive that it requires bigger diameter billet lifters to keep for breaking out the lifter bosses.
My head guy went on vacation, so I wonít have a new head for a couple of weeks since I decided to get a new laid back racing head built for it rather than reusing the one I have. It only has three races on it, but still Iíd rather have a new one built and leave that one on the orange kart thatís became known as the orange crusher. Tomorrow night Iíll probably check clearances, tonight Iím fondling my new cam and watching street outlaws.
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  #23  
Old 06-29-2020, 08:31 PM
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Those aren't even lobes. They are square notches
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Old 06-30-2020, 05:19 PM
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Those aren't even lobes. They are square notches
Yeah, and they’re causing me fittment issues too. The lobes are so big that they hit the crank, and the block.
Back to clearancing......
For some reason I can’t get pics to upload. It’s saying they’re too big.
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Old 06-30-2020, 09:26 PM
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I meant to say big square nobs but somehow autocorrect changed it for me...I was gonna fix it then the server went 'poof'...

Fitment issues suck. I didn't get a chance to work on mine today. My son and his wife stopped by so I didn't mess with it any.

So how do you think you can make it work? Or will it?
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  #26  
Old 07-01-2020, 05:00 PM
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I was able to make it work by grinding the corner off of the lifter boss, and cutting a notch in the counterweight on the crank.
So now there’s a point where the intake lobe actually dips inside of the crankshaft.
The angle of that picture makes the cut look awful. It’s actually pretty nice, but that’s the only angle I could get a picture from.
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  #27  
Old 07-01-2020, 05:02 PM
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Now that the pictures are working again, these were the issues I was having.
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  #28  
Old 07-01-2020, 07:23 PM
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Wow, so lemme ask you a dumb question. I know you are building this thing to turn some serious RPM. Are you going to have it balanced now since you had to cut away the crank like that? Even a few grams of weight will generate high frequency vibes enough to cause damage especially with the RPM I feel like you will be getting into. I'm guessing 10k with major torque loads with all that duration.

I wanna hear that thing turn dead dinosaurs into loud noise dude... really bad... I'll be waiting for that footage!
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  #29  
Old 07-01-2020, 10:07 PM
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I didn’t remove any more metal than I had to, it looks like more than it was in the picture, and that crank is generally used with a 3” piston, and I’m using a 2.835, so I actually feel like I’ve improved the balance if anything. I’ll set it up on some steel plate edges with the piston hung and do a poboy balance on it. I know a lot of guys that do it that way with good results. I don’t really feel like you can accurately balance these engines anyway. You might get it just right in a narrow rom range, but the nature of a single cylinder engine is not very agreeable to the traditional idea of balancing.
Short version, I’m just gonna send it.
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  #30  
Old 07-01-2020, 11:11 PM
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Well then...there ya go

Looks like you'll be sending it!!!
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  #31  
Old 07-03-2020, 03:11 PM
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Since I wonít have a head for this engine until late next week, or early the week after, I took a break from it to build a new engine for one of my buddies that had a professionally built engine grenade on him.
I didnít take a lot of pictures because I had no real intention of posting about it, but decided to when I found the cam was polished from the rod touching it because it wasnít properly clearanced. This one is a 70mm bore block I picked up from ARC wit a stick predator crank, 3.595 ARC long rod with a two ring Wiseco piston and 320 NR cam. Everything fits as it should after some time with a die grinder and shouldnít be a problem moving forward. Itíll have a 32/28 fully ported head with 60lb dual springs, and 1.2 roller rockers and be fed by a 28mm flat slide mikuni.
I just thought Iíd take a second to preach about the importance of clearances.
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  #32  
Old 07-03-2020, 09:02 PM
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Yeah... I'm glad I checked mine real good after the pic you took of yours where you had to clearance below the piston sleeve. I had to clearance both sides. The ARC rods have a much different profile...better check twice.

---------- Post added at 10:02 PM ---------- Previous post was at 10:01 PM ----------

That and I also installed a slightly longer rod... don't tell anyone about that
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  #33  
Old 07-06-2020, 07:02 AM
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Originally Posted by Flyinhillbilly View Post
I just thought Iíd take a second to preach about the importance of clearances.
And the importance of having a good engine guy.
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  #34  
Old 07-06-2020, 04:24 PM
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Yeah, I was a little disappointed in the quality of the pro built engine. I really feel like for what he charges it shouldíve at least been built where it wouldnít self destruct.
On a happier note, my pushrod kit and 1.2 rockers showed up from EC Tillotson today. With the lift my cam has, 1.2 rockers will give me .396 lift at the valve.
Now Iím just waiting on the head.
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