Search: Posts Made By: cathurga
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Forum: Gas Engines
Yesterday, 12:53 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Ok thanks Jiem, I wasnt sure if that was a hole...

Ok thanks Jiem, I wasnt sure if that was a hole or a pen-mark.
So what you are saying is that the throttle response was better once you increased the size of those holes? I noticed in your video,...
Forum: Gas Engines
02-13-2019, 10:09 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

JieM, I have a few questions regarding the...

JieM,

I have a few questions regarding the intake mods you have had done.

Firstly, why did you drill the big holes that you made as a later mod. The picture of you drilling out the bigger...
Forum: Gas Engines
02-13-2019, 09:59 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

JieM, that engine looks happy enough! Can you...

JieM, that engine looks happy enough! Can you show us a pic of your MMM hub mounted. Anything to look out for when installing it?

Anyone have any idea what would happen to the oil distribution to...
Forum: Gas Engines
02-13-2019, 01:56 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Hi, As recommended by someone else on the forum...

Hi,
As recommended by someone else on the forum (can’t recall who) I took a dremel and cut off about 1mm off the end of each plug cap. That allows the clip to hook under the hex part of the plug....
Forum: Gas Engines
02-12-2019, 10:02 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

Going back to the beginning of this thread, I see...

Going back to the beginning of this thread, I see this engine is 4 years in production, so the chance of it being disco'd completely, is probably real....

UMS anyone? :-)
Forum: Gas Engines
02-12-2019, 09:57 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

JeffH, Yeah, some YS engines dont have a...

JeffH,

Yeah, some YS engines dont have a breather, and I have had OS engines that had the breather redirected to a nipple on the inlet manifold/induction tube. These are all glow engines, and I...
Forum: Gas Engines
02-11-2019, 10:40 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

I have always been intrigued by the 'negative...

I have always been intrigued by the 'negative pressure' crankcase option, my first reaction is that it seems logical to aid with lubrication of crank and rotating mass. All 2-stroke engines work this...
Forum: Gas Engines
02-07-2019, 08:36 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Jeff, at break in settings, you are never going...

Jeff, at break in settings, you are never going to get cyl temps right, they will only get closer to their standard running temps when they are not running slobbery rich. I wouldnt make any...
Forum: Gas Engines
01-27-2019, 07:09 PM
Replies: 19
Views: 491
Posted By cathurga

Karolh, when you said the threads can get quite...

Karolh, when you said the threads can get quite vicious, did you actually mean viscous?😄
Forum: Gas Engines
01-21-2019, 10:33 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Knitting you say? But then you would have to have...

Knitting you say? But then you would have to have the carbon fibre, custom painted knitting needles....and those don’t come cheap :-)
Forum: Gas Engines
01-21-2019, 09:36 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Well, previously I was convinced that the timing...

Well, previously I was convinced that the timing was the cause of the issue, by simple virtue of the fact that pre-ignition was occurring and causing excessive pressure in the cylinders. That...
Forum: Gas Engines
01-21-2019, 08:29 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Adrien at CH-Ignitions has a video of the 84,...

Adrien at CH-Ignitions has a video of the 84, same problem. Mate of mine here has the 90, same problem.
its the same for the entire range, Morris has also explored the 19 & 33. Universal issue.
Forum: Gas Engines
01-19-2019, 11:59 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Sparky, I agree, it would make sense to take...

Sparky,
I agree, it would make sense to take the other cylinders apart and do a de-coke on the whole lot. Its just a PITA that you have to get a gasket set everytime, and they arent that cheap (for...
Forum: Gas Engines
01-19-2019, 05:47 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Didier, yeah it happens, but I was hoping it...

Didier, yeah it happens, but I was hoping it wouldn’t happen to me, and moreover, I wanted the timing to resolve this problem.
i realise that this engine has had problems before And has been my...
Forum: Gas Engines
01-18-2019, 08:35 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

Now what I find disturbing.....look at all that...

Now what I find disturbing.....look at all that carbon, the exhaust valve is in a VERY bad way.....this is with Redline at...
Forum: Gas Engines
01-18-2019, 08:30 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

Ok, here are some pics from yesterday. And some...

Ok, here are some pics from yesterday. And some rather disturbing discoveries about carbon build up....

First the cylinder crack. You can see it in place, as well as when I removed it. Obviously...
Forum: Gas Engines
01-18-2019, 08:32 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Sparky, Yes, it was running the Varioprop...

Sparky,

Yes, it was running the Varioprop mentioned previously. Max rpm was around 5200rpm static, never got any telemetry on it in the air.
Forum: Gas Engines
01-18-2019, 03:20 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Well, gentlemen, I am sitting here at my dining...

Well, gentlemen, I am sitting here at my dining room table, about to tuck into a HUGE portion of humble pie! Cylinder No2 let go earlier today in mid-flight. I will go into more detail later once I...
Forum: Gas Engines
01-17-2019, 09:08 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

LOL! Actually, go for it, make us all look...

LOL!

Actually, go for it, make us all look at that conversion. :-)

set the timing at 30deg and you will notice a difference for sure. There are a couple of ways to do it, but the best would be...
Forum: Gas Engines
01-16-2019, 08:36 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Don’t you dare run it on glow fuel!!!😄😄😄 i...

Don’t you dare run it on glow fuel!!!😄😄😄

i think you are overthinking the cam timing, there is only one part number, since they’re all the same. When you set the cam timing on cyl 1, you put the...
Forum: Gas Engines
01-15-2019, 10:27 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

757jonp you're 100% right on the design comment....

757jonp you're 100% right on the design comment. Ive not flown a lot of glow engines, but I would be cautious in saying that it might not be as critical in a glow engine, an area where Saito are the...
Forum: Gas Engines
01-15-2019, 12:48 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

Sparky, That about sums it up, and in full...

Sparky,
That about sums it up, and in full sized engines, I am sure they accounted for that with the ignition system making some compensation. I also agree that it is not going to be critical,...
Forum: Gas Engines
01-14-2019, 11:14 PM
Replies: 2,113
Views: 204,400
Posted By cathurga

Thanks Didier, I think we are agreed that this is...

Thanks Didier, I think we are agreed that this is consistent throughout the range.

I am sure the morris hubs will help us to get the timing as close to even as we can get. Someone also pointed...
Forum: Gas Engines
01-14-2019, 05:55 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Hey guys, Morris has a video up. ...

Hey guys, Morris has a video up.

https://youtu.be/DlEj-mU-Qww
Forum: Gas Engines
01-14-2019, 02:02 AM
Replies: 2,113
Views: 204,400
Posted By cathurga

Jeff, i dont think there is a need to...

Jeff,

i dont think there is a need to identify them. We know that some versions had some differences, but it appears that the crank angles are consistent so you would be good to go with the...
Showing results 1 to 25 of 318
 


 
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