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|05-30-2013, 07:32 PM||#1 (permalink)|
Join Date: Sep 2011
cheap lower tube vanity cap for midblock/half block owners
So I was looking over my 2K5 Prostock which I'm going to have midblocked when Stanchy picks up work again; and was looking at how the the CCM frame's rear "snatch grip" like end transitioned into the lower tube. The entire body is very curvy with swooping lines, so the flat end of the lower tube without the backblock just appears out of place.
I set out to find a large button head bolt to somehow mount into place. The problem was that most ordinary button head bolts in a 3/4-16 thread has a very large head (>1"); and a 1/2" threaded shank would require some sort of thread adapter to screw into the lower tube (perfect head size, .875).
I had already purchased a cheap tap off of eBay, preparing to go through with the 1/2" option; and decided to surf the net one more time to find something that would work.
Low and behold, I found a cheap button head screw, in a 3/4-16 thread, with a head diameter of .875. Bonus, the part is anodized flat black aluminum, so the piece can be re-anodized in the future.
That's the cheapest I found it, before shipping. The part I ordered was $10.17 shipped from Good Vibrations Motorsports, if shipping from the above place is too high.
Well, here she is, inserted into the lower tube of the Prostock.
The rear hex takes a 3/8" Allen, so the hex is plenty wide enough to drill the hole necessary to access the IVG and not worry about goofing the hex's walls. The piece takes 3 turns to full insertion, so at this point it's kind of deep in the hole; but the solution should be easy. I'll post pics when that bridge has been crossed.
|05-31-2013, 10:52 PM||#2 (permalink)|
Join Date: Sep 2011
Tonight I was able to make the necessary changes to the IVG and cap to achieve what would amount to a "1/2 turn from flush" adjustment with a stock IVG.
I used a 1/2" drill bit to bore the inside of the IVG; then used a small Dremel barrel grinding stone to remove the taper made by the drill bit, making the "bottom" of the bore flat.
I trimmed the hammer side of the IVG back to avoid contact with the hammer if turning the IVG far in becomes necessary.
I cut back a bit of the threads on the cap. I left 1 1/2 turns of threading. Since the purpose of this piece is to be used as a port blocker on a fuel rail, it comes equiped with an o ring land behind the head of the cap. The o ring missing from the IVG in the second pic now resides on the cap. I'd say that the o ring should work pretty damn well to prevent the cap from backing out, as it adds quite a bit of resistance when tightening the cap.
After trimming the cap, it became unnecessary to drill a hole into the cap to access the IVG. There is just enough material left in there to keep the end of the 3/8" Allen key from sliding past the cap.
Here's a pic with the cap installed and the IVG backed up against it.
|06-01-2013, 12:15 AM||#3 (permalink)|
Join Date: Feb 2012
Looks good. Questions, IVG bring trimmed down do you loose any integrity
|06-01-2013, 12:16 AM||#4 (permalink)|
A Little Grainy
Join Date: Aug 2010
Location: Fargo, ND
That's some awesome work! Great job, it really brings that back end together.
My friend was killed by a throwing star but I live because of D'Eagle - Thalion
The visible spectrum is Rainbows! - Pirate
We're gonna need a bigger hopper - splattttttt
|06-01-2013, 12:32 AM||#5 (permalink)|
Join Date: Sep 2011
Integrity, to be honest, I really don't know if will be bad. :s
I wouldn't figure it's bad. There's roughly .0780" of brass left back there; and the main spring is soft enough to collapse with two fingers (SLPS). When I get to dialing the gun in, maybe this weekend, I'll measure how close to full compression the spring is. I'd imagine if it went to full collapse and was a mech, maybe the force of the ram constantly pounding could blow the back out; but I truly do not know. This gun will stay a pump; but I wouldn't want someone to do this to an electro or mech if it would screw it up.
For the sake of experimentation, I can beat this one with a drift pin and hammer and see if it takes much to blow that back out. I always have another IVG I could bore out less.
Although, if someone more knowledgable could make a comment and save me some time, that would be awesome!
Last edited by danssoslow; 06-01-2013 at 12:44 AM.
|06-05-2013, 09:32 AM||#8 (permalink)|
I am stuck on bandaid...
Join Date: Apr 2006
Location: Orlando, FL
Yeah, what's the WORST that could happen? A spring pops out? Hard to get the busted part out? MAYBE screwed up threads in the gun.
I don't see any DANGER there.
...'cause bandaid's stuck on me!
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