Da 85 piped vs Da 100L

[leepord geko]

So I have read through the general thread's for a Da 100 and 85 along with the piped threads, from my knowledge it sounds like a Da 85cc with a tuned pipe would in the long run out exceed a Da 100L or just regular 100. The Da 85 is lighter by about a pound and a bit, along with it being $355 cheaper, and on a pipe turns more rpm on the same given prop then on a Da 100 with stock mufflers. The only down side I could see is it's a single cylinder which gives off more vibration than a 100 twin. I've also seen a piped Da 100 put out about the same rpm as a piped Da 85 which doesn't sound right to me. Let me know what you think or what you would go with.

Later

[jamesrxx951]

da 100 extremly reliable. and save the airframe alot less vibration.

[gapple12]

I personally like to keep the plane as light as possible. That is why I chose the 85 over the 100 on my 35%. Now, in the long run you will only save about 10 to 12 ounces from the two once you figure in the pipe, header, mounts, coupler, and clamp. On the vibration issue, I have found running this engine on a pipe will not hardly shake at all, well at least mine doesn't. I have seen this engine ran on a pitts style muffler and shake the crap out of an airplane. Mine is actually smother then some 100's Ive seen. In the long run, you will need to modify most airframes for this engine and pipe combo, when with the 100 your flying pretty quick.


http://www.flyinggiants.com/forums/f...ilot-diet.html

[leepord geko]

There both very reliable I'm just wondering why everyone goes for the Da 100 when you can save a pound and get like 600 more rpm, and if you want more power for 100 you have to run pipes which is not only really expensive but heavy as well.

[jamesrxx951]

the only sure way to do a accurate rpm comparo is have both engines side by side and use the exact same prop,fuel,and tuning method.

[gapple12]

	Quote: Originally Posted by jamesrxx951
	the only sure way to do a accurate rpm comparo is have both engines side by side and use the exact same prop,fuel,and tuning method.

Here you go, this has most of the info......

http://www.flyinggiants.com/forums/f...ild-notes.html

[MODE 1]

The 100 still has more torque than the 85 even on a pipe which is most noticeable on the up lines.

[rede2fly]

iam running both the 85 and 100. and my 85 on cannister does not shake any more than my 100 at a low rpm. and the 85 is a real stump puller. i know its not the very same,, but my 85 is swinging a xoar 27 x A 3-D and will rip the crap out of it. however my 100 is swinging a 27.5 X A 3-D and wont rip it at all. either way you go you wont loose but the 85 is a awsome motor and very easy to tune

[dbcaster]

I ran both in the same plane. My DA-85 with a 1090 was 4 oz. lighter than the DA-100L on stock mufflers. The rpm with the same prop was exactly the same. The 100 had better pull on an up line and less vibration plus all around smoother running. If you can run the 100 with stock mufflers in my opinion it is the only way to go. If running cans the 85 gets the weight advantage. I really think the noise of the 85 on the 1090 was about the same as the 100 on stock mufflers.

[gapple12]

	Quote: Originally Posted by dbcaster
	I ran both in the same plane. My DA-85 with a 1090 was 4 oz. lighter than the DA-100L on stock mufflers. The rpm with the same prop was exactly the same. The 100 had better pull on an up line and less vibration plus all around smoother running. If you can run the 100 with stock mufflers in my opinion it is the only way to go. If running cans the 85 gets the weight advantage. I really think the noise of the 85 on the 1090 was about the same as the 100 on stock mufflers.

How long ago did you have the 85? There were recently a ton of updates to this engine and since I got mine back, the difference is really noticeable in the vibration. I never tacked the engine before the updates, but seems to run much better.

[dbcaster]

It has been awhile so probably before the updates.

[gapple12]

	Quote: Originally Posted by dbcaster
	It has been awhile so probably before the updates.

The first few releases of this engine I think had some issues. Now, I can tell it runs 50% better and almost no vibration. I am going to try and get a video of it running just to show the smmmooooothhhnes...

All in all, if you can find a DA100"L" for a descent price, that would be my choice since the newer version is much lighter.