TREX 700 Nitro for sale
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Seller:JRSmith Details:
$2,150.00
| 10/8/2008
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Well I picked up this huge 40% yak and I needed a big engine for it. I opted for the Kroma 180 from DR Hobbies, I gave sales rep Todd Blose a call and in 3 days it was in my hands.
I happened to have a set of 125cc cans and headers from a DA 150 so I tried them on for size. I ended up opening up the bolt holes to the next largest size and it bolted right in. The ports were a little smaller so I opened them up a bit also. Tod recommended using 3W 200 headers, and I did buy them, but the port opening was practically the same size as the 150 so I used the 150 headers.
I installed the engine in the plane then it was time to fire it up. With the help of a couple friends to hold it back I choked it, throttle to half and 5 flips it fired off and quit. Choke off, throttle to idle, 4 flips and away it went. I figured for a new engine it would have taken a lot longer than that to get it running but all of us were surprised at how quickly and easily it started. Man what a wind storm behind this thing. I'm using a 32x10 for a breakin prop then I'll jump up from there.
We ran it only for a couple of minutes as it was getting dark and didn't have time to get to the flying field, but I was more than happy at how it started.
Plans are tomorrow to go flying, weather permitting, but I'll get more pictures, rpm numbers and perhaps a video then add onto this review.
Here's a few to start with:
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Gailvin Air Models Preformance Aircraft Unlimited; Fromeco Batteries Canadian Distributor
Posts: 2339
Joined: 11/23/2002 From: College Station,
TX, USA Status: offline
Nice! I'm interested in this engine brand to. I know Max Blose really well and I've seen his son fly a bunch. I'd like to get a DR 2.6M Extra to and i'm sure they would try to sell me one of these. I'm interested to see what you find. Everyone I read about that has one really likes them.
I got a chance to put 4 flights on it Sunday and so far I like it. I'm still running it rich and it's a little boggy from throttle up so I still need to fine tune it for good throttle transition.
I'll get more info after I have a chance to tweak the needles and get some time on it.
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Gailvin Air Models Preformance Aircraft Unlimited; Fromeco Batteries Canadian Distributor
Well I put 3 more flights on the Yak tonight and with each flight I tweaked the low needle a little each time. I think I'm getting close, the transitioning is getting much better each time.
As for starting, I'm pretty impressed on how it starts. First start of the day was 4 flips choke on, fires. Choke off, 4 more and its running. On the 3rd flight I didn't use any choke and fired off on the second flip, you gotta like that. For the $1495 price tag, I think this 180 is a good deal.
I'll get some video still but it won't be anything amazing, I'm still learning how to handle this big plane and I have a long way to go in learning 3d.
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Gailvin Air Models Preformance Aircraft Unlimited; Fromeco Batteries Canadian Distributor
I'm now up to 5 1/2 gallons through this engine and I really like it. It starts super easy, runs really well, and I know it's only going to get better.
That's freak'in ridiculous, I can't hover or harrier yet and you're doing it from behind your back .
I'm done with the break in process now and I've run 2 tanks of synthetic through it now. I did notice it richening some and the prop noise is louder now since I put the new oil in it, I'm using BelRay mc-1 synthetic.
I do have a little problem with fuel blow by or blow out though. I believe it is from the prop blast over the carb and drawing some of the fuel out since the carb sits almost out in the open. I bought a large intake from 3W and after enlarging the holes it bolts right in. I did have to replace the carb bolt as they were not long enough with the intake on. I'll have a chance this weekend to do more playing around with it and see how well it likes the new intake.
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Gailvin Air Models Preformance Aircraft Unlimited; Fromeco Batteries Canadian Distributor
looks to me like they have used basicaly the same casting originaly used for a piston ported single, and thats the exterior of the intake port that you can see (in other words a carb would have fitted there)
I originally had the 180 with headers from DA for the 150 with a few alterations to make it fit. I also had muffler cans for the exhaust and I was getting 5800 rpm with a mezlik 32x10. I was having problems with the cans, headers and the teflon connectors, part of it being very limited room in the tunnel, and burning through the connectors.
I since changed to stock mufflers, a little louder noise, but I picked up 400 rpm and now get 6200 rpm and a huge performance boost over the cans.
This is what I now recommend because there doesn't seem
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Kroma 180 Engine Review - 
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