MOPED ARMY

Shit. I was expecting that.

Hell, i should be happy. A short, straight intake is a metric fuckton easier to fabricobble.

How come many piston port intakes are long as shit ?

Wow 24 mm carb !

I destroyed my clutch on my Sachs 505 several times with 80cc reed kit and that was just running a 19 dellorto Phbg, the longest the clutch lasted was 48 miles before destroyed itself and I tried everything including 3 disks and spot weld on nut.

Not to get off topic but what are your plans for the clutch/clutch life for that Athena kit is a beast with a mid size carb let alone a 24mm one

No worries dude. Definitely want to talk to people about the clutch. As for plans, I don't know hahaha. I bought the "performance" clutch disks from L2S. Problem is the disks are thicker and that limits me to a 5 piece clutch. I'll probably try to find a 7 piece at some point or see if an Uber clutch pops up at some point.

Oh, it's also a manual clutch 2 speed so I'll probably be ok for a while. At least longer than 40 miles lol

Piston port engines will benefit from less regurged fuel out the carb inlet (fuel fog) if the intake is loooong

Alan W Wrote:

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I found the section that Jennings talks about this. P.92 Idk how i missed this. I am specifically interested in the testing process. Seems easy enough. I have a good bit of tubing to mess around with.

Also, stub pipe. Fuck you, neighbors. I'm stoked.

For intake-length experiments, you will need not only the stub-exhaust system,

but a tachometer on your motorcycle and either a long, straight road (or trail) or a hill.

These last are required because you must load the engine heavily enough to allow you a

good, seat-of-the-pants reading of the engine speed where the pipe has its effect on power.

And that effect will be unmistakable, for the engine will pull very strongly when

it comes “on the pipe”. You will also find that intake pipe length can move the stub

exhaust-equipped engine's power peak over a very wide speed range. My friends at

McCulloch, who acquainted me with the stub-exhaust testing technique, tell of tests they

have performed with an engine having an intake period of 120-degrees, and with pipes

ranging from 5- to 9 ½-inches in length they were able to move the power peak anywhere

from 3000 rpm to 8000 rpm. The 9 ½-inch length gave substantially the same power at

3000 rpm and 4000 rpm; at 5000 rpm, an 8 ½-inch was best; at 6000 rpm and 7000 rpm

the same power could be had with either a 9 ½- or 6 ½-inch length; and the same was true

at 8000 rpm, but with lengths of 5 ½and 8-inches. From these tests, it was determined

that the best compromise length for the entire range 3000-8000 rpm was 8-inches; a 5 ½-

inch length was slightly better for the range 6000-8000 rpm. It should be understood that

these lengths only apply to this specific example, and would vary with any changes in

intake timing, crankcase volume and intake tract diameter. They are given here only to

illustrate that: A) it is possible to make a given intake timing work over a wide speed

range by varying intake tract length; and B) that the same length may produce more than

one peak, or conversely that more than one length may be effective at any given power

peak.

Fuck it. Let's see how she goes.

I'm not really worried about it cracking. The pipe is 2.1mm walled steel. It'll only crack when I inevitably wreck it.

As for the reeds being a choke point: I have though about this and agreed. So i modified it. The reed block is no 4 petal monster, but it shouldn't be that much of a restriction. I have ground the block to match the square hole to the round intake. The inlet is plenty large enough imo.

I was just plugging the hole with that spark plug. That was on my keychain when i got hit by a car in like October. Kept it as a momento i guess.

Be still my heart. I love reading that people like my monster.

I think I'm going to calls it a Peuchs.

I see a lot of chatter about aluminum mounts. I wish i had a lathe so bad. I really like making shit out of metal. It makes me feel cool. Hell, i might just be able to get something from mcmaster that will be fine. I fucking love that place.

As for the intake breaking, I REEEALLLY dont think it will. It's obscenely beefy and mostly vertical . maybe the bolts will tear out but idk. I'm pretty good about making sure shit stays torqued. M5 torque spec (106 in-lbs) is more than 50% of M6 (177 in-lbs) and there are twice as many intake bolts as i'm used to w/ M6. In a cumulative sense, i'm better off. idk maybe i'm stupid.

I thought my Garelli had a lot of vibration. This thing is another level. I've only started it a few times. still have some stuff to work out before it's "on the road" Only time will tell.

yeah i don't want to be an internet hater, it might be good to go, what it will do, if it does it, is just bash the threads all to hell in the little screws and they get real sloppy, strip out if you don't catch them

loctite would help but who knows.

i actually ended up making the motor mounts out of hard plastic and they worked even better, i'm going to make some more soon, keep an eye out.

Yes length matters. Most intakes are territorial, and they determine territory size horizontally rather than vertically. But the difference between a 20 long and a 30 isn't enough to gain you any real amount of "territory" when you consider that for most of these parts, "territory" is measured in mph. The main difference between the two intakes would be in the volume for chemistry stability and dilution, and the amount of surface area for exchange of O2 and CO2.

The TM24 is super light for how big it is. When you say foaming, do you mean in the float bowl or in the intake? The intake is close enough to the frame that it would be really easy to brace if need be.

I'm not sure if I'll hit high enough revs to really make the fuel foam on the 505. My Garelli hits around 11k rippems and i don't have foam issues with an even lighter 21 Polini CP. My garbage CDI box holds me back, really.

I'll get some more pics tonight.

So I started it again today and ran it for 30 seconds or so, nothing crazy just trying to gauge how wrong my jetting is. Pretty sure i need a bigger idle jet, but i haven't really tinkered with the idle mix screw yet and I think the throttle isn't closing all the way. Also, I haven't put the exhaust together yet. You just get too excited you know?

Anyways, So many hand-tightened nuts fell off. The lower motor mount bolt was like half out cause i didn't put a nut on it yet. This bike will be a good time.

This is the only picture i got today. I'll get some more of the intake tomorrow. The first picture I posted was before i brazed the absolute fuck out of it since it leaked like a sieve with my shit weld. I am pleased with the result and it holds a good vacuum. Brazing is cool and surprisingly simple. I still don't think it'll break.

A bit late but search Jennings for intake pulse. Basically the length changes the harmonics, as does the size of the carb and air filter.