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January 8th, 2014, 01:13 | #1 |
My first High Speed Build
M4 cqb 8mm ver 2.
16awg silver wire + deans VS alum cylinder head stock ported cylinder Modify Hi Speed Piston -7 metal teeth short stroked SHS 13:1 gearset, sector gear short stroked Element super torque motor alum spring guide with bearing M110/120 Spring Bushings and a sector clip Need a basic mosfet to use with microswitch and lipo Suggestions? This is my first rof project, what am I missing? I need a piston head and sorbo right? share your thoughts please!! |
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January 8th, 2014, 01:19 | #2 |
Squid Porn Superstar, I love the tentacles!
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Did you short stroke from the pickup side or release side of the sector gear?
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January 8th, 2014, 01:21 | #3 |
January 8th, 2014, 01:32 | #4 |
Squid Porn Superstar, I love the tentacles!
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If you want to use a sector delay clip and you get close to or higher than 30 RPS you need to SS from the release side otherwise you will have tappet plate pre-engagement and have horribly inconsistent FPS.
Sector delay clip is not really necessary anyway, I have a 30 RPS gun feeding fine without one. I also find short stroking completely unnecessary unless it's to prevent tappet plate pre-engagement with a sector clip. |
January 8th, 2014, 01:45 | #5 | |
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I'd like to throw around 35rps, thats my target. Pre-engagement Badd. |
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January 8th, 2014, 02:29 | #6 |
Squid Porn Superstar, I love the tentacles!
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Test it before short stroking without a sector clip. If you need a sector clip then SS it.
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January 8th, 2014, 02:46 | #7 |
Let's clarify the use of shortstroking. It's used to prevent what is called "pre-engagement" of the sector gear to the piston. In a setup where the sector revolution is extremely fast, there is a possibility of the sector gear engaging the piston before it returned to a rest position, thus potentially breaking teeth, pulling the piston too far back and other funny failures. Lightening the piston assembly can reduce this problem, but only to a point. That is when you reduce the travel movement of the piston, so it'll return in place faster.
Now, let's go on the list one by one. - 16 AWG wire is good, but be sure the gearbox you have can fit it. - The hell is "VS"? As long as it fits and has a o-ring, it should be okay. I'd personally stick with a more reputable brand. - Stock cylinder is fine. Check inside if it's smooth. - Personally not fond on Modify parts, but a piston's a piston. I'd either get the Lonex Red one for the same price, or a cheaper SHS one. Like I said before, there is no need to shortstroke, but I'd remove some weight, even if it's labeled "High speed". My piston weights 12g (without the piston head) for example. - Gearset is good. Like before, read the shortstroke statement. - Google can't tell me on this motor, but as long as it works and has Neodymium magnets, it should be okay. SHS are a good choice in that price range too. - Spring guide with bearings is good, be sure to remove the bearings from the piston head to reduce the weight. Also, if you want my opinion, and you will hate my answer, but start by making this rifle 100% efficient with 18:1 gears. Change the motor for a neo motor if you want, change the piston if you need, but stay with 18:1. Get a grasp of all the things that could go wrong, make your teeth on the gearbox, learn why each parts need to be replace or not replaced. Then swap the gears for the 13:1. Normally if you made everything else before, it should be a breeze, and the only thing you'll have to worry will be the shimming if the new gearset. |
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January 8th, 2014, 03:01 | #8 |
Squid Porn Superstar, I love the tentacles!
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Short stroking and piston lightening to prevent pre-engagement are myths. Piston pre-engagement is caused by jams, not a gun cycling too fast. If a gun could actually cycle that fast you'd have a plethora of feeding problems, the sector gear contacts the tappet plate before engaging the piston again.
VS is a shit-tastic brand that Huang carries, but it's a cylinder head so who cares. I personally like Modify pistons. I have a Modify Quantum in my 450 FPS 30 RPS gun and it still looks pretty much new. This gun is using a 11.1 with standard 18:1 gears so like K3vX said test it with your original gear set first, you can get a pretty good rate of fire without high speed gears. Also lightening the piston assembly can help increase rate of fire by 1 or 2 RPS but it's not really that important. Unlightened piston, aluminum piston head and bearings, yet I'm still doing 30 RPS with no issues. |
January 8th, 2014, 13:16 | #9 | |
Mr. Silencer
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After 3 separate failures, I'm not a fan of Modify Quantum pistons. I've 3 separate failures on them - front of piston cracking, 2x piston under pick-up tooth caving in. The ABS plastic used isn't ideal and could use a mixture with more nylon fiber. Last edited by Stealth; January 8th, 2014 at 13:20.. |
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January 8th, 2014, 14:35 | #10 | |
Squid Porn Superstar, I love the tentacles!
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Maybe I've just had good luck with Modify stuff. I've only ever used one quantum piston and it's survived in that gun for a year and a half so far. |
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January 8th, 2014, 16:50 | #11 | |
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to the OP, 30 rps isn't exactly "high speed". there's guys pushing 50 full stroke on ASM with no problems. before I switched my build to the slowest motor known to man, it pushed 35 pretty much by accident. I think I said this before, but the fastest setups have m150s.
__________________
too busy tinkering to play. |
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January 8th, 2014, 17:32 | #12 |
Not Eye Safe, Pretty Boy Maximus on the field take his picture!
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80A lipo? Where did you put this 80,000Mah battery on your gun?
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January 8th, 2014, 17:37 | #13 | |
Mr. Silencer
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A piston of a particular weight, traveling at y velocity based on the spring strength, will not move faster than the gear train and you just can't defeat physics like that. Unless of course you've come up with a phenomenal super-glide piston rail system that allows the it to move much faster than normal thus creating a larger pressure system, increasing FPS. But the increased FPS would negate the requirement of using an M90 spring in the first place, so what's the point? |
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January 8th, 2014, 18:24 | #14 | ||
Squid Porn Superstar, I love the tentacles!
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Piston weight doesn't seem to have a significant affect on FPS output, that says to me it shouldn't have a significant affect on piston return speed. |
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January 8th, 2014, 18:57 | #15 | |
particularly awesome lipos are available in something like 90C, so 80 amps isn't hard to do at all.
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__________________
too busy tinkering to play. |
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