stanleyoutdoors
Well-known member
I need to port a 100cc 2stroke cylinder and my dremel with angle head adapter just won't fit (like in pic below).
Any suggestions?
Thanks
Any suggestions?
Thanks
Really small Dremel-type tool for porting small-bore 2 strokes?
- Thread starter stanleyoutdoors
- Start date
Professor Gascan
Well-known member
- Joined
- Dec 26, 2024
- Messages
- 178
Do they still make the flexible wand attachment?
BCreekDave
Well-known member
Air powered dental drill with 1/16 diameter carbide burrs.
jar944
Well-known member
Rotary Hand Tool 90 Degree Right Angle
Rotary Hand Tool 90 Degree Right Angle for porting and polishing 2 stroke engines
www.ccspecialtytoolstore.com
Seems to have gone up in price a bit since I bought mine
shoot summ
Well-known member
- Joined
- Jun 8, 2010
- Messages
- 2,952
WOW, I think mine was around $200 back in the day...Rotary Hand Tool 90 Degree Right Angle
Rotary Hand Tool 90 Degree Right Angle for porting and polishing 2 stroke engineswww.ccspecialtytoolstore.com
Seems to have gone up in price a bit since I bought mine
Was my thought also - I got that as part of the kit I bought many years ago, and have been surprised how much I've used it.
jar944
Well-known member
driftpin
Well-known member
I had a Dremel wand for many years, it sat, unused. At some point, I tried it out, and it's stayed in-place ever since. I know a Dremel's more of a light-duty use, that's OK, it's done jobs for me that I couldn't have done otherwise, except for buying something much-more expensive.
shoot summ
Well-known member
- Joined
- Jun 8, 2010
- Messages
- 2,952
Professor Gascan said:
Do they still make the flexible wand attachment?
Won't work for porting the transfers on a small 2 stroke, the right angle tool posted by JAR944 is the only good solution. Might try to find someone that would let you borrow their setup(I judiciously loaned mine a couple of times), or just pay to have the porting done. I'm assuming since the OP is asking they know what they are doing, but porting isn't a "bigger is better" task, and with a 100cc you can go from good to really bad in a mm or two.
Do they still make the flexible wand attachment?
Won't work for porting the transfers on a small 2 stroke, the right angle tool posted by JAR944 is the only good solution. Might try to find someone that would let you borrow their setup(I judiciously loaned mine a couple of times), or just pay to have the porting done. I'm assuming since the OP is asking they know what they are doing, but porting isn't a "bigger is better" task, and with a 100cc you can go from good to really bad in a mm or two.
OP
stanleyoutdoors
Well-known member
Thanks for the replies. That's what I need, but don't want to spend that much.
OP
stanleyoutdoors
Well-known member
You are correct. I don't mess with size or shape much for that exact reason. Mostly just smooth everything.
shoot summ
Well-known member
- Joined
- Jun 8, 2010
- Messages
- 2,952
You can get long shaft 1/8" burrs that work really well for getting in some of the places. It's fun to do, I have spent many hours porting cylinders in the past. Honestly though if you aren't changing the size/discharge/duration of the transfers the work you are doing is more for your fun, it really isn't going to net you a seat of the pants improvement.
OP
stanleyoutdoors
Well-known member
I've had a lot of good luck with just smoothing everything on 250's. More power everywhere, but especially at high rpm.
I'm typically looking for more low to mid range for Enduro, so I often mill the base of the cylinder and correct the squish and comp ratio in addition to smoothing. That's what I'm considering doing on a Husqvarna 105 (85 with big bore) for my daughter. I have gone all-in with epoxying the transfers, stuffing the case, etc, but that's a lot of work. Still scared to change the port shapes though. As you alluded to, there's too much chance of really screwing it up.
jar944
Well-known member
Read everything on the internet from Jan Thiel (passed away this week) and Frits Overmars.
There is a ton of information they both shared about their work at Aprilia over on the pit lane forum across a few threads (part 1-5) that spanned the better part of a decade.
Or just google "All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars"
I think a flex shaft rotary would be the way to go for this. Foredom is the brand that I see most people using for high precision work - lots of jewelers use these: https://www.foredom.net/product-category/flex-shaft-tools/
The motor is obviously much more powerful than a Dremel, they are much easier to manipulate, and they're usually foot pedal operated so you have greater control than needing to adjust speed on a Dremel.
I picked mine up for about $150 second hand with a lot of attachments, if I remember correctly.
The motor is obviously much more powerful than a Dremel, they are much easier to manipulate, and they're usually foot pedal operated so you have greater control than needing to adjust speed on a Dremel.
I picked mine up for about $150 second hand with a lot of attachments, if I remember correctly.
OP
stanleyoutdoors
Well-known member
I'll look into that- thanks.
I have been going off A. Graham Bell's "2-stroke performance" book as well as a few things a top karting tuner taught me.
Gordon Jennings' "Two-stroke Tuner's Handbook" was the bible back when I was doing that stuff in the 1970's.